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KSZ8567RTXI - 7-Port 10/100 AVB Ethernet Switch | Microchip
KSZ8567RTXI

KSZ8567RTXI - 7-Port 10/100 AVB Ethernet Switch | Microchip

The Microchip Technology KSZ8567RTXI is a fully integrated Layer-2 managed seven-port 10/100 Ethernet switch with five integrated PHYs, designed to exceed Automotive AEC-Q100 Grade 2 (-40C to +105C) and EMC requirements. It is offered in a 128-pin TQFP-EP (14x14 mm) package and supports both I2C and SPI host management interfaces. A managed Ethernet switch is a Layer-2 networking IC that forwards Ethernet frames between multiple ports using MAC address learning, VLAN tagging, QoS prioritization, and IGMP snooping. It sits hierarchically between the PHY layer and the network host processor, enabling deterministic low-latency communication on automotive, industrial, and AVB/TSN time-sensitive networks. The KSZ8567 family adds Audio Video Bridging (AVB) hardware timestamping and TSN-ready QoS, extending the basic managed-switch feature set with synchronized media-stream support. Key features include seven 10/100 Mbps ports (five with integrated 10BASE-T/100BASE-TX PHYs, two RGMII/MII/RMII host-facing MACs), IEEE 802.1Q VLAN support, 802.1p QoS with four priority queues, IEEE 1588v2 and 802.1AS time stamping, AVB hardware assist, and a 1.2V core with 3.3V I/O supply. The device also includes cable-diagnostics, on-chip termination, and Energy-Efficient Ethernet (EEE) support for low-power idle states. Architecturally, the KSZ8567RTXI integrates five physical-layer transceivers, a wire-speed store-and-forward switching engine, per-port buffer memory, and a management interface block exposing I2C, SPI, MIIM, and GPIOs. AEC-Q100 Grade 2 qualification, enhanced ESD protection, and on-chip PHY terminations simplify EMC-compliant board design in automotive and industrial environments. Typical applications include automotive in-vehicle networking gateways, industrial Ethernet switches, AVB/TSN bridges for professional audio/video equipment, building automation controllers, and IEC 61850 / IEC 62439 industrial process switches. The integrated PHYs minimize external magnetics count, while AVB/TSN hardware accelerates deterministic Ethernet streams. When designing with the KSZ8567RTXI, observe the 50-ohm single-ended PHY trace impedance with continuous ground reference, decouple all four supply rails (3.3V, 2.5V, 1.8V, 1.2V) close to the package, and provide an exposed-pad solder connection for thermal dissipation. MDI traces to magnetics should be kept to under 25 mm and routed as 100-ohm differential pairs to meet IEEE 802.3 return-loss masks. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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KSZ8567STXI - 7-Port Managed 10/100 Ethernet Switch | Microchip
KSZ8567STXI

KSZ8567STXI - 7-Port Managed 10/100 Ethernet Switch | Microchip

Microchip Technology KSZ8567STXI is a fully integrated, managed seven-port 10/100 Ethernet switch with five integrated 10/100BASE-T PHYs, I2C and SPI management interfaces, and a 128-TQFP exposed-pad package measuring 14 x 14 mm. The device is designed for Automotive AEC-Q100 Grade 2 requirements over -40°C to +105°C and exceeds specified EMC requirements. Its managed Layer 2 architecture supports advanced networking features including IEEE 1588 v2, AVB, Energy Efficient Ethernet, Wake-on-LAN, QoS, LinkMD+, and fault recovery. An Ethernet switch is a Layer 2 network-semiconductor device that receives Ethernet frames on one port and forwards them toward the appropriate destination port using MAC-address tables. A managed switch adds configuration, monitoring, traffic prioritization, timing, and recovery functions that distinguish it from a basic unmanaged switch. The KSZ8567 integrates seven-port switching, five copper PHYs, a host-management interface, and automotive-oriented robustness into one device. Five of the seven ports include 10/100BASE-T copper PHYs. The switching fabric supports full-duplex 100 Mbit/s copper links for local industrial, automotive, communications, and embedded network equipment. The integrated PHY reduces external magnetics and copper-interface component count, while the I2C and SPI interfaces allow a host controller to configure registers, monitor port status, and implement network-management functions. The KSZ8567 family includes fault-recovery, IEEE 1588 v2 precision-time support, Audio Video Bridging, Energy Efficient Ethernet, Wake-on-LAN, and QoS capabilities. IEEE 1588 v2 timing can support synchronized traffic in systems requiring precise time distribution. AVB and QoS are useful when deterministic traffic must share Ethernet links with less timing-critical network traffic. EEE can reduce link energy where supported by the complete network, while LinkMD+ provides cable diagnostics that simplify commissioning and fault isolation. Typical applications include automotive Ethernet gateways, industrial control systems, networked sensors, factory equipment, embedded service interfaces, and compact Ethernet aggregation units. The 128-TQFP exposed-pad package supports substantial copper-based thermal dissipation on multilayer PCBs, but thermal performance still depends on the pad, vias, copper area, and ambient conditions. For a new design, verify the complete pin assignment, reference clock requirements, magnetic-component recommendations, register initialization, and layout guidance in the manufacturer datasheet. Preserve the exposed-pad land pattern and connect it to the intended ground plane according to the package drawing. When assessing a second source, confirm pinout and firmware behavior in addition to the number of ports; a functionally similar Ethernet component is not automatically a drop-in replacement. This page combines manufacturer device information, package and interface details, commercial sourcing guidance, and engineering-focused replacement criteria. It helps engineers identify whether the KSZ8567STXI matches a seven-port managed-switch requirement before beginning PCB layout and software configuration.

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KSZ8721B - 2.5V 10/100 Ethernet PHY | Microchip
KSZ8721B

KSZ8721B - 2.5V 10/100 Ethernet PHY | Microchip

The Microchip Technology KSZ8721B is a 2.5 V single-supply 10Base-T/100Base-TX/FX Ethernet physical-layer transceiver with a 48-SSOP package. It supports MII and RMII host interfaces, integrates the 10BaseT and 100BaseTX physical-layer functions, and provides a low-voltage, low-power Ethernet interface for embedded systems. An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital frame data into signals suitable for copper twisted-pair or fiber media and converts received signals back into digital data. The KSZ8721B belongs to the Ethernet interface hierarchy: transceiver -> physical layer -> network interface IC -> semiconductor. Its 2.5 V operating supply is suitable for low-power embedded platforms that already provide compatible I/O levels. The KSZ8721B supports 10Base-T and 100Base-TX operation, along with 100Base-FX capability as identified in the product description. The MII and RMII host interfaces support different host-side connection styles, allowing the same PHY to serve systems with parallel media-independent or reduced media-independent interfaces. The device also includes integrated 10Base-T functions, reducing the need for separate medium-access and coding functions around the PHY. The verified product listing describes KSZ8721B as a 48-SSOP part and identifies it as a 10/100 Base-TX/FX MII physical-layer transceiver. The manufacturer’s related datasheet snippet identifies the KS8721B/BT family as operating at 2.5 V and containing PMA, PMD, and PCS functions. Electrical limits, exact pin functions, temperature limits, clocking requirements, and layout guidance should be taken from the manufacturer datasheet before final design release. Typical uses include industrial Ethernet controllers, embedded control systems, communication modules, test equipment, and low-power network appliances. The MII interface is useful when the host controller requires a conventional parallel bus, while RMII can reduce the number of host-side signals in compatible designs. The 2.5 V supply also helps system designers manage power budgets on compact embedded boards. When laying out the circuit, place the PHY, magnetics, connector, decoupling, and clock or reset components according to the manufacturer reference layout. Validate signal integrity across MII or RMII timing, provide continuous reference planes, and verify cable and magnetics compatibility. The KSZ8721B is not a general-purpose connector or power device, so its SOA field is not applicable. This page consolidates the verified manufacturer and distributor information for the KSZ8721B, including package identity, interface type, sourcing links, practical application guidance, and clearly marked data gaps. It is intended to accelerate engineering evaluation while avoiding unsupported electrical claims.

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KSZ8721B-TR - 10/100 Ethernet PHY Transceiver | Microchip (Tape & Reel)
KSZ8721B-TR

KSZ8721B-TR - 10/100 Ethernet PHY Transceiver | Microchip (Tape & Reel)

The Microchip Technology KSZ8721B-TR is a single-channel 10/100 Base-TX/FX Ethernet physical-layer transceiver operating from a 3.3 V single supply in a 48-pin TQFP package measuring 7 mm by 7 mm. According to the manufacturer product information, the device supports both MII and RMII host interfaces, 10BASE-T and 100BASE-TX copper links, and 100BASE-FX fiber links. Its core role is to connect a digital Ethernet host interface to an Ethernet medium through integrated PCS and PMA functions. An Ethernet PHY transceiver is an interface IC that converts parallel digital Ethernet data into physical signaling for copper or optical media, while receiving and decoding incoming signals. The KSZ8721 belongs to the PHY hierarchy: Ethernet interface IC, physical-layer transceiver, 10/100 Ethernet PHY, and network interface semiconductor. Supporting both copper and fiber media makes it useful in industrial control, embedded networking, communications equipment, and factory automation systems. Verified source information identifies the KSZ8721 as a 10BaseT/100BaseTX/FX physical-layer transceiver with MII and RMII host connectivity. The RMII option can reduce host pin requirements compared with a parallel MII arrangement, which is valuable when conserving connector and processor I/O resources. The 100BASE-FX capability supports fiber links where electrical copper reach or electromagnetic environments make optical media preferable. Exact PHY tolerances, clock requirements, link-distance targets, and electrical thresholds must be confirmed in the manufacturer datasheet before design release. The 48-TQFP surface-mount package is suitable for automated PCB assembly and compact multilayer boards. Its exact pin functions, exposed-pad arrangement, supply connections, and grounding requirements were not supplied in the verified excerpts, so they must not be inferred. Designers should preserve the manufacturer's recommended magnetics, termination network, RJ45 layout, fiber-isolation boundary, and high-speed trace topology. Decoupling and return paths are particularly important because Ethernet PHY performance depends on clean references and controlled common-mode behavior. Typical uses include 10/100 Ethernet links in embedded controllers, industrial Ethernet gateways, serial-to-Ethernet equipment, network switches, test instruments, and optical-to-copper media converters. The combination of MII, RMII, copper, and fiber support lets one device bridge several common legacy network-interface architectures. Exact suitability for a particular MAC, processor, transformer, optical module, or cable length must be verified against the complete datasheet and system timing requirements. This page consolidates the verified manufacturer, distributor, and datasheet-index information while clearly separating missing technical data. Its engineering value is the application guidance, sourcing context, and explicit compatibility boundaries rather than guessed specifications. Before purchasing or laying out a replacement board, verify lifecycle status, exact electrical limits, pinout, media support, and package details against the authoritative Microchip documentation. This page also distinguishes verified facts from open engineering questions. Because the excerpts do not supply a complete electrical table, package drawing, lifecycle statement, or pin-level map, each missing item is marked rather than estimated. That conservative approach is essential for Ethernet hardware, where an incorrect pin assignment, unsupported interface mode, or inappropriate power assumption can prevent link negotiation or damage a design.

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KSZ8721BA4 - 10/100 Ethernet Transceiver | Microchip Technology
KSZ8721BA4

KSZ8721BA4 - 10/100 Ethernet Transceiver | Microchip Technology

The Microchip Technology KSZ8721BA4 is a single-port 10/100 Mbps Ethernet transceiver with integrated Media Access Controller and Physical Layer functions, supporting both MII and RMII protocols in a 48-SSOP package. The device is intended for embedded networking equipment requiring a compact Ethernet interface and flexible host connectivity options. An Ethernet transceiver combines the physical-layer functions required to transmit and receive data over twisted-pair cabling with the MAC functions needed to organize frames and manage network access. The KSZ8721BA4 can operate through either the Media Independent Interface, which provides a wider parallel data and control interface, or the Reduced Media Independent Interface, which uses fewer signals and is useful where board space and pin count are constrained. In the broader electronics hierarchy, this device is an interface IC, network transceiver, Ethernet PHY and MAC integration. Verified distributor information identifies the KSZ8721BA4 as a 1/1 transceiver supporting full-duplex 10/100 Mbps Ethernet, MII and RMII protocols, and a 48-SSOP package. The single-port configuration allows one Ethernet network connection on an embedded controller or industrial system. Its support for both MII and RMII gives designers a choice between a more parallel host interface and a reduced-pin interface without changing the transceiver family. The integrated MAC and PHY arrangement reduces the external component count required for a basic Ethernet endpoint. In an RMII implementation, the host controller connects to the transceiver through the reduced interface, while the transceiver handles the physical signaling and network framing functions. In an MII implementation, the device exposes the additional parallel signals required by the fuller interface. The exact operating voltage, clock requirements, transceiver pin assignments and electrical timing limits are not present in the supplied verified data and should be confirmed against the manufacturer datasheet. Typical applications include industrial Ethernet control systems, embedded routers, network-interface modules, factory equipment, building automation controllers and compact communications products. The MII support is useful when the host system expects the conventional parallel Ethernet interface, while RMII is generally preferable where connector density and PCB routing simplicity matter. The part is supplied in a surface-mount 48-SSOP package, allowing automated board assembly rather than through-hole insertion. When designing around the KSZ8721BA4, confirm the selected MII or RMII host interface, power architecture, clocking method, magnetic-interface implementation and Ethernet magnetics before layout release. Check the manufacturer datasheet for the exact reference circuit, decoupling requirements, termination values and pin names; these details are not specified in the supplied search results and should not be inferred from generic Ethernet transceiver designs. This product page combines the verified distributor and manufacturer information for the KSZ8721BA4 with practical interface-selection guidance, package details, sourcing context and a conservative replacement analysis. It is intended to help engineers identify the correct Ethernet transceiver and verify its mechanical, electrical and procurement requirements before committing a new design to production.

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KSZ8721BA4TR - 10/100 Ethernet Transceiver | Microchip Technology (Tape & Reel)
KSZ8721BA4TR

KSZ8721BA4TR - 10/100 Ethernet Transceiver | Microchip Technology (Tape & Reel)

The Microchip Technology KSZ8721BA4TR is a single-port 10/100 Mbps Ethernet transceiver with integrated Media Access Controller and Physical Layer functions, supporting both MII and RMII protocols in a 48-SSOP package. The device is intended for embedded networking equipment requiring a compact Ethernet interface and flexible host connectivity options. An Ethernet transceiver combines the physical-layer functions required to transmit and receive data over twisted-pair cabling with the MAC functions needed to organize frames and manage network access. The KSZ8721BA4TR can operate through either the Media Independent Interface, which provides a wider parallel data and control interface, or the Reduced Media Independent Interface, which uses fewer signals and is useful where board space and pin count are constrained. In the broader electronics hierarchy, this device is an interface IC, network transceiver, Ethernet PHY and MAC integration. Verified distributor information identifies the KSZ8721BA4TR as a 1/1 transceiver supporting full-duplex 10/100 Mbps Ethernet, MII and RMII protocols, and a 48-SSOP package. The single-port configuration allows one Ethernet network connection on an embedded controller or industrial system. Its support for both MII and RMII gives designers a choice between a more parallel host interface and a reduced-pin interface without changing the transceiver family. The integrated MAC and PHY arrangement reduces the external component count required for a basic Ethernet endpoint. In an RMII implementation, the host controller connects to the transceiver through the reduced interface, while the transceiver handles the physical signaling and network framing functions. In an MII implementation, the device exposes the additional parallel signals required by the fuller interface. The exact operating voltage, clock requirements, transceiver pin assignments and electrical timing limits are not present in the supplied verified data and should be confirmed against the manufacturer datasheet. Typical applications include industrial Ethernet control systems, embedded routers, network-interface modules, factory equipment, building automation controllers and compact communications products. The MII support is useful when the host system expects the conventional parallel Ethernet interface, while RMII is generally preferable where connector density and PCB routing simplicity matter. The part is supplied in a surface-mount 48-SSOP package, allowing automated board assembly rather than through-hole insertion. When designing around the KSZ8721BA4TR, confirm the selected MII or RMII host interface, power architecture, clocking method, magnetic-interface implementation and Ethernet magnetics before layout release. Check the manufacturer datasheet for the exact reference circuit, decoupling requirements, termination values and pin names; these details are not specified in the supplied search results and should not be inferred from generic Ethernet transceiver designs. This product page combines the verified distributor and manufacturer information for the KSZ8721BA4TR with practical interface-selection guidance, package details, sourcing context and a conservative replacement analysis. It is intended to help engineers identify the correct Ethernet transceiver and verify its mechanical, electrical and procurement requirements before committing a new design to production.

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KSZ8721BI - 2.5V 10/100 Ethernet PHY Transceiver | Microchip
KSZ8721BI

KSZ8721BI - 2.5V 10/100 Ethernet PHY Transceiver | Microchip

The Microchip Technology KSZ8721BI is a 2.5 V 10Base-T and 100Base-TX/FX Ethernet physical-layer transceiver with a 1/1 driver-receiver configuration and MII/RMII host interface. It is packaged in a 48-SSOP and is intended for low-voltage, low-power embedded Ethernet designs. According to the Microchip KSZ8721 product page, the device contains the 10Base-T physical medium attachment, 100Base-TX/FX PMD, and media-independent interface functions required to connect a network processor to copper or fiber media hardware. An Ethernet PHY is the analog and digital interface between a host controller and an Ethernet network medium. It converts logical MII or RMII data into differential 10Base-T or 100Base-TX signaling, receives and recovers incoming signals, and provides collision, carrier, and link-status information to the host. The KSZ8721 therefore sits between an Ethernet-capable microcontroller, application processor, or network controller and a magnetics-based Ethernet jack or an external fiber-media interface. The KSZ8721BI operates at 2.5 V to support low-voltage and low-power system requirements. Distributor records identify a 2.375 V to 2.625 V operating supply range, a 48-SSOP package, MII and RMII protocols, and a tube-style shipping format for the KSZ8721BI ordering code. Its 10/100 capability allows a design to support 10 Mbps or 100 Mbps operation while retaining a conventional MII path and an RMII option for host interfaces with fewer pins. The MII interface exposes separate control, data, and status signals in a parallel form, while RMII reduces the host-side signal count for a more compact implementation. Host-side selection depends on the controller's supported clock and data arrangement, so designers should verify MII-versus-RMII configuration against the system controller and required operating mode. The PHY also requires an appropriate clock reference and the correct external magnetics or fiber-media interface implementation. Typical uses include industrial controllers, embedded gateways, set-top boxes, print servers, and legacy Ethernet-equipped embedded systems. In a copper link, the device sits on the line side of an isolation transformer network. In a fiber-oriented design, its 100Base-FX capability can be combined with an external optical transceiver, although fiber-module and magnetics selection remain board-level responsibilities. The principal design consideration is the separation between host-side digital signals and line-side analog signaling. Keep MII or RMII routing short, provide clean clock distribution, use the required decoupling, and follow the manufacturer's reference layout for the media interface. Verify magnetics, termination, and isolation components against the selected 10Base-T or 100Base-TX network topology. This page consolidates manufacturer information, distributor pricing, and engineering guidance for the KSZ8721BI. It also documents verified parameter gaps instead of substituting unverified values, helping designers compare the device accurately before committing a PCB layout to production.

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KSZ8721BI-TR - 2.5V 10/100 Ethernet PHY Transceiver | Microchip (Tape & Reel)
KSZ8721BI-TR

KSZ8721BI-TR - 2.5V 10/100 Ethernet PHY Transceiver | Microchip (Tape & Reel)

The Microchip Technology KSZ8721BI-TR is a 2.5 V 10Base-T and 100Base-TX/FX Ethernet physical-layer transceiver with a 1/1 driver-receiver configuration and MII/RMII host interface. It is packaged in a 48-SSOP and is intended for low-voltage, low-power embedded Ethernet designs. According to the Microchip KSZ8721 product page, the device contains the 10Base-T physical medium attachment, 100Base-TX/FX PMD, and media-independent interface functions required to connect a network processor to copper or fiber media hardware. An Ethernet PHY is the analog and digital interface between a host controller and an Ethernet network medium. It converts logical MII or RMII data into differential 10Base-T or 100Base-TX signaling, receives and recovers incoming signals, and provides collision, carrier, and link-status information to the host. The KSZ8721 therefore sits between an Ethernet-capable microcontroller, application processor, or network controller and a magnetics-based Ethernet jack or an external fiber-media interface. The KSZ8721BI-TR operates at 2.5 V to support low-voltage and low-power system requirements. Distributor records identify a 2.375 V to 2.625 V operating supply range, a 48-SSOP package, MII and RMII protocols, and a tube-style shipping format for the KSZ8721BI-TR ordering code. Its 10/100 capability allows a design to support 10 Mbps or 100 Mbps operation while retaining a conventional MII path and an RMII option for host interfaces with fewer pins. The MII interface exposes separate control, data, and status signals in a parallel form, while RMII reduces the host-side signal count for a more compact implementation. Host-side selection depends on the controller's supported clock and data arrangement, so designers should verify MII-versus-RMII configuration against the system controller and required operating mode. The PHY also requires an appropriate clock reference and the correct external magnetics or fiber-media interface implementation. Typical uses include industrial controllers, embedded gateways, set-top boxes, print servers, and legacy Ethernet-equipped embedded systems. In a copper link, the device sits on the line side of an isolation transformer network. In a fiber-oriented design, its 100Base-FX capability can be combined with an external optical transceiver, although fiber-module and magnetics selection remain board-level responsibilities. The principal design consideration is the separation between host-side digital signals and line-side analog signaling. Keep MII or RMII routing short, provide clean clock distribution, use the required decoupling, and follow the manufacturer's reference layout for the media interface. Verify magnetics, termination, and isolation components against the selected 10Base-T or 100Base-TX network topology. This page consolidates manufacturer information, distributor pricing, and engineering guidance for the KSZ8721BI-TR. It also documents verified parameter gaps instead of substituting unverified values, helping designers compare the device accurately before committing a PCB layout to production.

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KSZ8721BL - 100Mbps Ethernet PHY | Microchip | LQFP-48
KSZ8721BL

KSZ8721BL - 100Mbps Ethernet PHY | Microchip | LQFP-48

The Microchip KSZ8721BL is a 3.3 V single-supply 10/100BASE-TX/FX Ethernet physical-layer transceiver with MII and RMII host interfaces, operating at up to 100 Mbps in a 48-pin LQFP package. It supports a 2.5 V core for low-voltage and low-power operation, includes automatic MDI/MDI-X crossover, and is intended for embedded Ethernet designs requiring copper twisted-pair or fiber connections. An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital MAC data into electrical or optical signaling suitable for a network medium and converts received signals back into digital data. The PHY sits between a host controller and the physical network medium, commonly using an MII or RMII interface. The KSZ8721BL therefore belongs to the Ethernet interface hierarchy: transceiver, network interface controller companion, interface IC, and semiconductor. Key verified features include 100 Mbps operation, MII and RMII host-interface support, 10/100BASE-TX and 100BASE-FX capability, automatic MDI/MDI-X crossover, 3.3 V single-supply operation, and a 2.5 V core. The commercial temperature range is 0°C to +70°C. The reported supply current is 151 mA, while the exact pin mapping, package dimensions, transceiver electrical limits, and full timing values are not all available in the supplied excerpts. The device is suitable when an embedded processor, microcontroller, FPGA, or Ethernet controller needs an Ethernet media-access solution without implementing analog PHY circuitry on the PCB. Its RMII interface can reduce host-side wiring compared with MII, while MII support provides compatibility with systems designed around parallel Ethernet control signals. The integrated 2.5 V core is relevant to low-voltage processor ecosystems and power-conscious embedded equipment. Typical applications include industrial Ethernet equipment, embedded gateways, set-top boxes, printers, game or media systems, network adapters, and control systems with 10/100BASE-T connectivity. Fiber-capable 100BASE-FX support can also suit equipment intended for longer-distance point-to-point links when the required optical partner and external implementation are present. When designing around KSZ8721BL, confirm the exact package variant and pinout against the manufacturer datasheet, preserve the required decoupling and media-interface layout, and verify the external magnetics or fiber components required by the selected network medium. The supplied data confirms the commercial temperature grade and 48-pin LQFP option, but does not establish RoHS, REACH, AEC-Q100, or halogen-free status. This product page consolidates the verified manufacturer description, technical identifiers, source links, and application guidance into an engineering-oriented reference for the KSZ8721BL Ethernet PHY.

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KSZ8721BL-TR - 100Mbps Ethernet PHY | Microchip | LQFP-48 (Tape & Reel)
KSZ8721BL-TR

KSZ8721BL-TR - 100Mbps Ethernet PHY | Microchip | LQFP-48 (Tape & Reel)

The Microchip KSZ8721BL-TR is a 3.3 V single-supply 10/100BASE-TX/FX Ethernet physical-layer transceiver with MII and RMII host interfaces, operating at up to 100 Mbps in a 48-pin LQFP package. It supports a 2.5 V core for low-voltage and low-power operation, includes automatic MDI/MDI-X crossover, and is intended for embedded Ethernet designs requiring copper twisted-pair or fiber connections. An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital MAC data into electrical or optical signaling suitable for a network medium and converts received signals back into digital data. The PHY sits between a host controller and the physical network medium, commonly using an MII or RMII interface. The KSZ8721BL-TR therefore belongs to the Ethernet interface hierarchy: transceiver, network interface controller companion, interface IC, and semiconductor. Key verified features include 100 Mbps operation, MII and RMII host-interface support, 10/100BASE-TX and 100BASE-FX capability, automatic MDI/MDI-X crossover, 3.3 V single-supply operation, and a 2.5 V core. The commercial temperature range is 0°C to +70°C. The reported supply current is 151 mA, while the exact pin mapping, package dimensions, transceiver electrical limits, and full timing values are not all available in the supplied excerpts. The device is suitable when an embedded processor, microcontroller, FPGA, or Ethernet controller needs an Ethernet media-access solution without implementing analog PHY circuitry on the PCB. Its RMII interface can reduce host-side wiring compared with MII, while MII support provides compatibility with systems designed around parallel Ethernet control signals. The integrated 2.5 V core is relevant to low-voltage processor ecosystems and power-conscious embedded equipment. Typical applications include industrial Ethernet equipment, embedded gateways, set-top boxes, printers, game or media systems, network adapters, and control systems with 10/100BASE-T connectivity. Fiber-capable 100BASE-FX support can also suit equipment intended for longer-distance point-to-point links when the required optical partner and external implementation are present. When designing around KSZ8721BL-TR, confirm the exact package variant and pinout against the manufacturer datasheet, preserve the required decoupling and media-interface layout, and verify the external magnetics or fiber components required by the selected network medium. The supplied data confirms the commercial temperature grade and 48-pin LQFP option, but does not establish RoHS, REACH, AEC-Q100, or halogen-free status. This product page consolidates the verified manufacturer description, technical identifiers, source links, and application guidance into an engineering-oriented reference for the KSZ8721BL-TR Ethernet PHY.

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KSZ8721BLI - 3.3V 10/100 Ethernet PHY | Microchip
KSZ8721BLI

KSZ8721BLI - 3.3V 10/100 Ethernet PHY | Microchip

Microchip KSZ8721BLI is a 3.3 V single-supply 10/100BASE-TX/FX Ethernet physical-layer transceiver with full MII and RMII host interfaces, supplied in a 48-LQFP 7x7 mm package. The device operates at 10 Mbps and 100 Mbps and supports 10BASE-T copper, 100BASE-TX copper, and 100BASE-FX fiber media through integrated physical-layer functions. Its low-voltage 2.5 V to 3.3 V operating capability is intended to reduce system power while supporting 10BASE-T/100BASE-TX/FX network connections. An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital frame data into electrical or optical signaling suitable for a network medium. In the hierarchy of network semiconductors, the PHY sits below the Ethernet controller or media-access controller and above the transformer, connector, or fiber interface. The KSZ8721BLI also provides an MDI/MDI-X auto-crossover function, allowing copper links to use a standard straight-through cable arrangement without manual crossover configuration. The KSZ8721BLI combines 10BASE-T and 100BASE-TX/FX support in one transceiver while offering both MII and RMII host connectivity. Full MII provides a parallel interface for legacy or higher-bandwidth controller arrangements, whereas RMII reduces the number of host-side signals and is useful in space-constrained embedded systems. The single 3.3 V supply architecture simplifies power design, although interface voltage compatibility must still be checked against the selected host controller. The device is positioned for industrial embedded networking, where a 10/100 Mbps copper or fiber link can be added without implementing the complete Ethernet data path in the host. Its industrial temperature option is identified by the KSZ8721 family documentation, which lists a -40°C to +85°C industrial range. Package construction is surface-mount LQFP, allowing conventional PCB assembly and inspection while requiring careful pin-1 orientation and solderability checks. Typical uses include industrial controllers, factory automation equipment, embedded gateways, serial-to-Ethernet systems, media converters, and compact network appliances. For copper links, designers must add the appropriate isolation transformer and RJ-05 or shielded-jack hardware. For fiber links, the external optical components and interface requirements should be implemented according to the manufacturer application guidance rather than inferred from the PHY package alone. The main design consideration is interface verification. Confirm that the host controller supports the selected MII or RMII mode, the transceiver’s supply voltage, and the external magnetics required by the target copper or fiber network. This page consolidates the verified source links, pricing observation, package information, replacement data, and engineering considerations into a practical procurement and design reference.

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KSZ8721BLI-TR - 3.3V 10/100 Ethernet PHY | Microchip (Tape & Reel)
KSZ8721BLI-TR

KSZ8721BLI-TR - 3.3V 10/100 Ethernet PHY | Microchip (Tape & Reel)

Microchip KSZ8721BLI-TR is a 3.3 V single-supply 10/100BASE-TX/FX Ethernet physical-layer transceiver with full MII and RMII host interfaces, supplied in a 48-LQFP 7x7 mm package. The device operates at 10 Mbps and 100 Mbps and supports 10BASE-T copper, 100BASE-TX copper, and 100BASE-FX fiber media through integrated physical-layer functions. Its low-voltage 2.5 V to 3.3 V operating capability is intended to reduce system power while supporting 10BASE-T/100BASE-TX/FX network connections. An Ethernet physical-layer transceiver, or Ethernet PHY, converts digital frame data into electrical or optical signaling suitable for a network medium. In the hierarchy of network semiconductors, the PHY sits below the Ethernet controller or media-access controller and above the transformer, connector, or fiber interface. The KSZ8721BLI-TR also provides an MDI/MDI-X auto-crossover function, allowing copper links to use a standard straight-through cable arrangement without manual crossover configuration. The KSZ8721BLI-TR combines 10BASE-T and 100BASE-TX/FX support in one transceiver while offering both MII and RMII host connectivity. Full MII provides a parallel interface for legacy or higher-bandwidth controller arrangements, whereas RMII reduces the number of host-side signals and is useful in space-constrained embedded systems. The single 3.3 V supply architecture simplifies power design, although interface voltage compatibility must still be checked against the selected host controller. The device is positioned for industrial embedded networking, where a 10/100 Mbps copper or fiber link can be added without implementing the complete Ethernet data path in the host. Its industrial temperature option is identified by the KSZ8721 family documentation, which lists a -40°C to +85°C industrial range. Package construction is surface-mount LQFP, allowing conventional PCB assembly and inspection while requiring careful pin-1 orientation and solderability checks. Typical uses include industrial controllers, factory automation equipment, embedded gateways, serial-to-Ethernet systems, media converters, and compact network appliances. For copper links, designers must add the appropriate isolation transformer and RJ-05 or shielded-jack hardware. For fiber links, the external optical components and interface requirements should be implemented according to the manufacturer application guidance rather than inferred from the PHY package alone. The main design consideration is interface verification. Confirm that the host controller supports the selected MII or RMII mode, the transceiver’s supply voltage, and the external magnetics required by the target copper or fiber network. This page consolidates the verified source links, pricing observation, package information, replacement data, and engineering considerations into a practical procurement and design reference.

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KSZ8721BT - 10/100 Ethernet PHY Transceiver | Microchip
KSZ8721BT

KSZ8721BT - 10/100 Ethernet PHY Transceiver | Microchip

The Microchip Technology KSZ8721BT is a single-channel 10/100 Base-TX/FX Ethernet physical-layer transceiver operating from a 3.3 V single supply in a 48-pin TQFP package measuring 7 mm by 7 mm. According to the manufacturer product information, the device supports both MII and RMII host interfaces, 10BASE-T and 100BASE-TX copper links, and 100BASE-FX fiber links. Its core role is to connect a digital Ethernet host interface to an Ethernet medium through integrated PCS and PMA functions. An Ethernet PHY transceiver is an interface IC that converts parallel digital Ethernet data into physical signaling for copper or optical media, while receiving and decoding incoming signals. The KSZ8721 belongs to the PHY hierarchy: Ethernet interface IC, physical-layer transceiver, 10/100 Ethernet PHY, and network interface semiconductor. Supporting both copper and fiber media makes it useful in industrial control, embedded networking, communications equipment, and factory automation systems. Verified source information identifies the KSZ8721 as a 10BaseT/100BaseTX/FX physical-layer transceiver with MII and RMII host connectivity. The RMII option can reduce host pin requirements compared with a parallel MII arrangement, which is valuable when conserving connector and processor I/O resources. The 100BASE-FX capability supports fiber links where electrical copper reach or electromagnetic environments make optical media preferable. Exact PHY tolerances, clock requirements, link-distance targets, and electrical thresholds must be confirmed in the manufacturer datasheet before design release. The 48-TQFP surface-mount package is suitable for automated PCB assembly and compact multilayer boards. Its exact pin functions, exposed-pad arrangement, supply connections, and grounding requirements were not supplied in the verified excerpts, so they must not be inferred. Designers should preserve the manufacturer's recommended magnetics, termination network, RJ45 layout, fiber-isolation boundary, and high-speed trace topology. Decoupling and return paths are particularly important because Ethernet PHY performance depends on clean references and controlled common-mode behavior. Typical uses include 10/100 Ethernet links in embedded controllers, industrial Ethernet gateways, serial-to-Ethernet equipment, network switches, test instruments, and optical-to-copper media converters. The combination of MII, RMII, copper, and fiber support lets one device bridge several common legacy network-interface architectures. Exact suitability for a particular MAC, processor, transformer, optical module, or cable length must be verified against the complete datasheet and system timing requirements. This page consolidates the verified manufacturer, distributor, and datasheet-index information while clearly separating missing technical data. Its engineering value is the application guidance, sourcing context, and explicit compatibility boundaries rather than guessed specifications. Before purchasing or laying out a replacement board, verify lifecycle status, exact electrical limits, pinout, media support, and package details against the authoritative Microchip documentation. This page also distinguishes verified facts from open engineering questions. Because the excerpts do not supply a complete electrical table, package drawing, lifecycle statement, or pin-level map, each missing item is marked rather than estimated. That conservative approach is essential for Ethernet hardware, where an incorrect pin assignment, unsupported interface mode, or inappropriate power assumption can prevent link negotiation or damage a design.

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KSZ8721CL - 10/100 Ethernet PHY, MII, 48-LQFP | Microchip
KSZ8721CL

KSZ8721CL - 10/100 Ethernet PHY, MII, 48-LQFP | Microchip

The Microchip Technology KSZ8721CL is a single-port 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII and RMII host interfaces, a 3.3 V supply, and a 48-LQFP 7 x 7 mm package. The verified distributor information identifies one transmitter and one receiver, Full MII operation, and tray packaging. An Ethernet PHY is the physical-layer interface between a network MAC and copper or fiber cabling. It converts digital MAC data into electrical signaling for 10/100 Ethernet networks and receives incoming signals for recovery by the MAC. The KSZ8721 family therefore belongs to the Ethernet interface IC and physical-layer transceiver hierarchy, supporting 10BASE-T copper, 100BASE-TX copper, and 100BASE-FX optical-fiber links. The KSZ8721 supports 3.3 V single-supply operation and is described by Microchip as operating from 2.5 V to meet low-voltage and low-power requirements. Its mixed-signal design is intended to extend signaling distance while reducing power consumption. The available data confirms MII and RMII host-interface options, but individual MII clock rates, RMII timing limits, transceiver insertion loss, crossover support, and link-distance limits are not supplied here and require manufacturer-datasheet confirmation. Typical implementation roles include industrial Ethernet controllers, embedded network equipment, single-port Ethernet switches, print servers, and communication equipment. In an MII design, the PHY interfaces through parallel digital signals to a MAC or switch engine; in an RMII design, it uses the reduced pin-count interface specified by the host controller. The 48-LQFP package provides 48 external connections but requires careful high-speed signal layout. A key design consideration is that Ethernet PHY performance depends as much as the IC on magnetic-interface components, crystal timing, controlled-impedance PCB routing, supply bypassing, and isolation from noisy switching circuitry. Verify the exact transceiver mode, pin names, recommended magnetics, termination, and reference schematic against the current Microchip datasheet before layout release. This product data consolidates verified distributor availability, package information, interface capabilities, and technical-source links with application guidance and transparent data-gap markers. It is intended to accelerate sourcing and initial engineering review without replacing the manufacturer datasheet or schematic-level validation.

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KSZ8721CL-TR - 10/100 Ethernet PHY, MII, 48-LQFP | Microchip (Tape & Reel)
KSZ8721CL-TR

KSZ8721CL-TR - 10/100 Ethernet PHY, MII, 48-LQFP | Microchip (Tape & Reel)

The Microchip Technology KSZ8721CL-TR is a single-port 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII and RMII host interfaces, a 3.3 V supply, and a 48-LQFP 7 x 7 mm package. The verified distributor information identifies one transmitter and one receiver, Full MII operation, and tray packaging. An Ethernet PHY is the physical-layer interface between a network MAC and copper or fiber cabling. It converts digital MAC data into electrical signaling for 10/100 Ethernet networks and receives incoming signals for recovery by the MAC. The KSZ8721 family therefore belongs to the Ethernet interface IC and physical-layer transceiver hierarchy, supporting 10BASE-T copper, 100BASE-TX copper, and 100BASE-FX optical-fiber links. The KSZ8721 supports 3.3 V single-supply operation and is described by Microchip as operating from 2.5 V to meet low-voltage and low-power requirements. Its mixed-signal design is intended to extend signaling distance while reducing power consumption. The available data confirms MII and RMII host-interface options, but individual MII clock rates, RMII timing limits, transceiver insertion loss, crossover support, and link-distance limits are not supplied here and require manufacturer-datasheet confirmation. Typical implementation roles include industrial Ethernet controllers, embedded network equipment, single-port Ethernet switches, print servers, and communication equipment. In an MII design, the PHY interfaces through parallel digital signals to a MAC or switch engine; in an RMII design, it uses the reduced pin-count interface specified by the host controller. The 48-LQFP package provides 48 external connections but requires careful high-speed signal layout. A key design consideration is that Ethernet PHY performance depends as much as the IC on magnetic-interface components, crystal timing, controlled-impedance PCB routing, supply bypassing, and isolation from noisy switching circuitry. Verify the exact transceiver mode, pin names, recommended magnetics, termination, and reference schematic against the current Microchip datasheet before layout release. This product data consolidates verified distributor availability, package information, interface capabilities, and technical-source links with application guidance and transparent data-gap markers. It is intended to accelerate sourcing and initial engineering review without replacing the manufacturer datasheet or schematic-level validation.

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KSZ8721SL - 10/100 Ethernet PHY | Microchip Technology
KSZ8721SL

KSZ8721SL - 10/100 Ethernet PHY | Microchip Technology

The Microchip Technology KSZ8721SL is a 3.3 V single-supply 10/100BASE-TX/FX Ethernet physical-layer transceiver with MII and RMII host interfaces, supplied in a 48-pin SSOP package. It supports 10 Mb/s and 100 Mb/s Ethernet links and is identified as a full IEEE 802.3 transceiver for industrial and embedded Ethernet designs. An Ethernet physical-layer transceiver, commonly called an Ethernet PHY, is the circuit that connects a digital Ethernet controller to a twisted-pair or fiber medium. The PHY belongs to the network-interface IC hierarchy and combines functions such as physical-medium attachment, physical-medium-dependent circuitry, and physical coding sub-layer operation. The KSZ8721SL translates frames between the parallel MII or RMII interface of a host controller and encoded Ethernet signals on the network medium. The principal verified specifications for the KSZ8721SL include a 3.3 V operating supply, support for both 10BASE-T and 100BASE-TX operation, additional 100BASE-FX capability, MII and RMII host interfaces, an IEEE 802.3-compliant transceiver configuration, and a 48-pin SSOP surface-mount package. Its commercial operating-temperature range is 0 °C to +70 °C. The SMD package supports compact embedded systems while exposing separate network and host-interface functions. The MII interface supports a parallel Ethernet controller connection, while RMII reduces the number of host-interface signals compared with MII. This makes the RMII connection useful when the selected Ethernet MAC requires a compact serial control and data interface. The fiber-capable 100BASE-FX feature also allows the same physical-layer family to address copper and fiber link requirements, subject to the external optical and isolation circuitry required by the specific design. Typical uses include industrial Ethernet equipment, embedded control systems, network adapters, print servers, factory automation equipment, and communications products requiring 10 Mb/s or 100 Mb/s Ethernet. Designers should confirm whether the selected board uses copper, fiber, or both media and should validate the required transformers, isolation components, magnetic-interface layout, termination, and host-interface timing against the manufacturer datasheet. The principal design consideration is that the KSZ8721SL is a commercial-temperature, 48-pin SSOP device rather than an industrial-temperature substitute. Layout should provide a continuous ground reference, short supply connections, controlled-length differential copper routing, and compliant separation between network-side and host-side circuitry where applicable. Its 3.3 V single-supply operation also requires the host interface, clocking, and external network components to be compatible with the implemented interface topology. This page combines the verified manufacturer and distributor information with package, sourcing, design, and replacement guidance intended to reduce common selection errors. It distinguishes confirmed drop-in options from unreferenced parts and leaves unavailable electrical, pricing, and pin-level details explicitly marked rather than estimating them.

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KSZ8721SL-TR - 10/100 Ethernet PHY | Microchip Technology (Tape & Reel)
KSZ8721SL-TR

KSZ8721SL-TR - 10/100 Ethernet PHY | Microchip Technology (Tape & Reel)

The Microchip Technology KSZ8721SL-TR is a 3.3 V single-supply 10/100BASE-TX/FX Ethernet physical-layer transceiver with MII and RMII host interfaces, supplied in a 48-pin SSOP package. It supports 10 Mb/s and 100 Mb/s Ethernet links and is identified as a full IEEE 802.3 transceiver for industrial and embedded Ethernet designs. An Ethernet physical-layer transceiver, commonly called an Ethernet PHY, is the circuit that connects a digital Ethernet controller to a twisted-pair or fiber medium. The PHY belongs to the network-interface IC hierarchy and combines functions such as physical-medium attachment, physical-medium-dependent circuitry, and physical coding sub-layer operation. The KSZ8721SL-TR translates frames between the parallel MII or RMII interface of a host controller and encoded Ethernet signals on the network medium. The principal verified specifications for the KSZ8721SL-TR include a 3.3 V operating supply, support for both 10BASE-T and 100BASE-TX operation, additional 100BASE-FX capability, MII and RMII host interfaces, an IEEE 802.3-compliant transceiver configuration, and a 48-pin SSOP surface-mount package. Its commercial operating-temperature range is 0 °C to +70 °C. The SMD package supports compact embedded systems while exposing separate network and host-interface functions. The MII interface supports a parallel Ethernet controller connection, while RMII reduces the number of host-interface signals compared with MII. This makes the RMII connection useful when the selected Ethernet MAC requires a compact serial control and data interface. The fiber-capable 100BASE-FX feature also allows the same physical-layer family to address copper and fiber link requirements, subject to the external optical and isolation circuitry required by the specific design. Typical uses include industrial Ethernet equipment, embedded control systems, network adapters, print servers, factory automation equipment, and communications products requiring 10 Mb/s or 100 Mb/s Ethernet. Designers should confirm whether the selected board uses copper, fiber, or both media and should validate the required transformers, isolation components, magnetic-interface layout, termination, and host-interface timing against the manufacturer datasheet. The principal design consideration is that the KSZ8721SL-TR is a commercial-temperature, 48-pin SSOP device rather than an industrial-temperature substitute. Layout should provide a continuous ground reference, short supply connections, controlled-length differential copper routing, and compliant separation between network-side and host-side circuitry where applicable. Its 3.3 V single-supply operation also requires the host interface, clocking, and external network components to be compatible with the implemented interface topology. This page combines the verified manufacturer and distributor information with package, sourcing, design, and replacement guidance intended to reduce common selection errors. It distinguishes confirmed drop-in options from unreferenced parts and leaves unavailable electrical, pricing, and pin-level details explicitly marked rather than estimating them.

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KSZ8721SLI - 10/100 Ethernet PHY | Microchip Technology
KSZ8721SLI

KSZ8721SLI - 10/100 Ethernet PHY | Microchip Technology

Microchip Technology KSZ8721SLI is a single-channel 10/100 Ethernet physical-layer transceiver with a 48-SSOP package, operating from a 2.5 V core and supporting a 3.3 V single-supply application. It provides separate 10Base-T and 100Base-TX/FX physical-medium functions plus MII and RMII host interfaces for transmitting and receiving Ethernet data. The device supports 10 Mbps and 100 Mbps operation and is intended for embedded networking equipment requiring a dedicated Ethernet PHY. An Ethernet physical-layer transceiver, or Ethernet PHY, converts logical digital data into electrical signaling for a physical network medium. The KSZ8721SLI belongs to the integrated-circuit hierarchy physical-layer transceiver > Ethernet interface IC > interface IC. Its 10Base-T capability supports legacy 10 Mbps copper Ethernet, while 100Base-TX/FX supports Fast Ethernet over twisted pair or optical-fiber-compatible links. The MII and RMII interfaces allow a host processor or network controller to connect through either a parallel media-independent interface or the more pin-efficient reduced media-independent interface. Key verified features include full IEEE 802.3 operation, support for 10Base-T, 100Base-TX, and 100Base-FX physical media, and both MII and RMII host connectivity. The KSZ8721 operates its core at 2.5 V to address low-voltage and low-power requirements, while the device is described as a 3.3 V single-supply transceiver. Its 48-SSOP package provides enough pins for separate transmit, receive, management, clock, and host-interface functions. Technically, the KSZ8721SLI consolidates a 10Base-T physical medium attachment function, a 100Base-TX/FX physical medium attachment function, and the associated host-facing digital interface into one package. MII exposes a wider parallel bus, while RMII reduces the number of host-interface signals and is commonly preferred when the connected controller supports it. The manufacturer identifies the KSZ8721 family as a 10BaseT, 100BaseTX, and FX physical-layer transceiver designed for low-power embedded networking. Typical uses include industrial Ethernet controllers, embedded gateways, set-top equipment, printer and scanner interfaces, test equipment, and OEM network appliances. A board designer can connect the KSZ8721SLI to an Ethernet transformer or appropriate fiber interface, provide the required decoupling, and connect it to an MII- or RMII-capable controller. The choice of media interface and magnetics should be based on the required copper or fiber link distance and system compliance targets. A critical design consideration is confirming the controller's MII or RMII timing, clock requirements, reset behavior, and supported media type against the manufacturer datasheet before layout release. Input and output supply rails should be decoupled close to the device, while the copper or fiber network path should be routed according to the selected magnetics and medium requirements. Do not infer unverified pin assignments or timing values from distributor listings alone. This page consolidates verified manufacturer and distributor information, package details, commercially relevant sourcing links, and same-family replacement evidence. It also provides application guidance and comparison context intended to support faster component selection without treating unreported electrical parameters as verified facts.

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KSZ8721SLI-TR - 10/100 Ethernet PHY | Microchip Technology (Tape & Reel)
KSZ8721SLI-TR

KSZ8721SLI-TR - 10/100 Ethernet PHY | Microchip Technology (Tape & Reel)

Microchip Technology KSZ8721SLI-TR is a single-channel 10/100 Ethernet physical-layer transceiver with a 48-SSOP package, operating from a 2.5 V core and supporting a 3.3 V single-supply application. It provides separate 10Base-T and 100Base-TX/FX physical-medium functions plus MII and RMII host interfaces for transmitting and receiving Ethernet data. The device supports 10 Mbps and 100 Mbps operation and is intended for embedded networking equipment requiring a dedicated Ethernet PHY. An Ethernet physical-layer transceiver, or Ethernet PHY, converts logical digital data into electrical signaling for a physical network medium. The KSZ8721SLI-TR belongs to the integrated-circuit hierarchy physical-layer transceiver > Ethernet interface IC > interface IC. Its 10Base-T capability supports legacy 10 Mbps copper Ethernet, while 100Base-TX/FX supports Fast Ethernet over twisted pair or optical-fiber-compatible links. The MII and RMII interfaces allow a host processor or network controller to connect through either a parallel media-independent interface or the more pin-efficient reduced media-independent interface. Key verified features include full IEEE 802.3 operation, support for 10Base-T, 100Base-TX, and 100Base-FX physical media, and both MII and RMII host connectivity. The KSZ8721 operates its core at 2.5 V to address low-voltage and low-power requirements, while the device is described as a 3.3 V single-supply transceiver. Its 48-SSOP package provides enough pins for separate transmit, receive, management, clock, and host-interface functions. Technically, the KSZ8721SLI-TR consolidates a 10Base-T physical medium attachment function, a 100Base-TX/FX physical medium attachment function, and the associated host-facing digital interface into one package. MII exposes a wider parallel bus, while RMII reduces the number of host-interface signals and is commonly preferred when the connected controller supports it. The manufacturer identifies the KSZ8721 family as a 10BaseT, 100BaseTX, and FX physical-layer transceiver designed for low-power embedded networking. Typical uses include industrial Ethernet controllers, embedded gateways, set-top equipment, printer and scanner interfaces, test equipment, and OEM network appliances. A board designer can connect the KSZ8721SLI-TR to an Ethernet transformer or appropriate fiber interface, provide the required decoupling, and connect it to an MII- or RMII-capable controller. The choice of media interface and magnetics should be based on the required copper or fiber link distance and system compliance targets. A critical design consideration is confirming the controller's MII or RMII timing, clock requirements, reset behavior, and supported media type against the manufacturer datasheet before layout release. Input and output supply rails should be decoupled close to the device, while the copper or fiber network path should be routed according to the selected magnetics and medium requirements. Do not infer unverified pin assignments or timing values from distributor listings alone. This page consolidates verified manufacturer and distributor information, package details, commercially relevant sourcing links, and same-family replacement evidence. It also provides application guidance and comparison context intended to support faster component selection without treating unreported electrical parameters as verified facts.

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KSZ8841-PMQL - 10/100 Ethernet PCI Controller | Microchip
KSZ8841-PMQL

KSZ8841-PMQL - 10/100 Ethernet PCI Controller | Microchip

The Microchip Technology KSZ8841-PMQL is a single-port Fast Ethernet MAC controller with a 32-bit, 33 MHz PCI processor interface, supplied in a 128-pin PQFP package measuring 14 x 20 mm. It combines an IEEE 802.3u-compatible 10/100 Base-T/TX Ethernet controller with a host-bus interface intended for PCI-based embedded systems. The controller integrates the Ethernet MAC function with the physical-layer interface needed for a single 10/100 network port. An Ethernet MAC controller is an interface integrated circuit that manages frame transmission and reception between a computing host and an Ethernet network. The MAC layer identifies network frames and handles access to the communications medium, while the integrated Fast Ethernet physical interface connects that logical function to twisted-pair cabling. In the system hierarchy, the KSZ8841-PMQL belongs to the class of Ethernet interface controllers and network interface integrated circuits used within embedded networking equipment. The KSZ8841-PMQL provides one 10/100 Base-T/TX port, a 32-bit PCI interface, and a stated PCI operating frequency of 33 MHz. Its IEEE 802.3u compatibility identifies the intended Fast Ethernet protocol generation. The device is also associated with a non-PCI member of the KSZ8841 series, KSZ8841-MQL, which uses a different CPU interface and therefore requires a different host-side design rather than being a universal substitute. The PCI host interface provides a parallel processor-facing path for moving Ethernet frames between the controller and an embedded PCI system. This makes the device appropriate for legacy or industrial embedded platforms that retain PCI infrastructure but require an integrated 10/100 Ethernet connection. The 128-PQFP package also provides a substantial pin count for the MAC, PCI, clock, reset, power, and physical-network functions represented by this controller. Typical applications for the KSZ8841-PMQL include PCI-based industrial controllers, embedded communication equipment, network interface adapters, and legacy embedded systems requiring 10/100 Base-T/TX connectivity. The controller can also serve as the foundation for custom PCI network-interface subsystems where a dedicated Ethernet MAC is required instead of a higher-complexity system-on-chip. Designers should distinguish the standard KSZ8841-PMQL from the industrial-temperature KSZ8841-PMQLI version when selecting the correct ordering code. PCB implementation must follow the manufacturer's 128-pin PQFP pinout and recommended layout guidance, including correct termination, clocking, reset sequencing, and Ethernet physical-layer routing. This product page combines the manufacturer identification, package information, interface details, comparison candidates, and application guidance needed to evaluate the KSZ8841-PMQL. Request a Quote on this page for current commercial availability, lead time, and supporting documentation.

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KSZ8842-PMBL - 2-Port 10/100 Ethernet Switch | Microchip
KSZ8842-PMBL

KSZ8842-PMBL - 2-Port 10/100 Ethernet Switch | Microchip

The Microchip Technology KSZ8842-PMBL is a two-port 10/100 Base-T Ethernet switch with a generic 32-bit, 33 MHz PCI processor interface, supplied in a 100-LFBGA 9 x 9 mm package. It provides two integrated 10/100 Ethernet ports, an integrated DMA engine, managed Layer 2 switching, and low-power operation for embedded networking equipment. An Ethernet switch is a network-semiconductor device that connects multiple physical network nodes while forwarding Ethernet frames according to Layer 2 addresses. The KSZ8842 belongs to the Ethernet switch hierarchy and integrates physical-layer transceivers, frame processing, port management, and a host-facing peripheral bus within one IC. Its PCI interface allows a processor or embedded controller to configure the switch, manage traffic, and exchange data with the connected Ethernet ports without requiring a separate external Ethernet controller. The manufacturer datasheet identifies the KSZ8842-PMQL/PMBL as the first fully managed two-port switch with a 32-bit, 33 MHz PCI processor interface. The device is compliant with IEEE 802.3u, supports 10/100 Base-T networking, and includes an integrated DMA engine for efficient host data movement. Its four-generation integrated Layer 2 switch architecture supports managed switching functions while reducing the component count of embedded Ethernet designs. The KSZ8842-PMBL is intended for compact PCI-based embedded systems where two Ethernet links are needed close to the host processor. Typical signal paths include industrial control equipment, embedded servers, communication appliances, test systems, and PCI expansion products. A 122 mA supply current value is identified for this device, making system-level power budgeting important when two ports operate continuously. The principal design consideration is the 100-LFBGA footprint. The board must provide the exact ball layout defined by the manufacturer package drawing and must accommodate the PCI, clock, power, reset, and Ethernet magnetics interfaces. Review the ordering information and pin-description tables in the manufacturer datasheet before assigning ball assignments or preparing the PCB footprint. The KSZ8842-PMBL is also the base commercial-temperature ordering code within the PMQL/PMBL PCI-interface family. The PMBL suffix identifies the LFBGA package, while the PMQL suffix identifies a different package. Industrial-temperature ordering variants include the -AM designation; verify the exact suffix, grade, and shipping configuration when substituting parts. This product page consolidates the known switch, interface, package, and ordering information with engineering-focused application guidance, replacement considerations, and a parameter comparison. It also distinguishes electrical or temperature-grade alternatives from packaging-only order codes so engineers can assess PCB compatibility before redesigning an existing LFBGA design.

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KSZ8842-PMQL - 2-Port 10/100 PCI Ethernet Switch | Microchip
KSZ8842-PMQL

KSZ8842-PMQL - 2-Port 10/100 PCI Ethernet Switch | Microchip

Microchip Technology KSZ8842-PMQL is a fully managed two-port 10/100 Ethernet switch with a generic 32-bit, 33 MHz PCI processor interface, housed in a 128-pin PQFP package measuring 14 mm by 20 mm. The device provides two integrated Fast Ethernet ports, an integrated DMA engine, and low-power operation for PCI-based embedded networking designs. An Ethernet switch is a Layer 2 network device that forwards Ethernet frames between connected nodes while using MAC-address learning to reduce unnecessary traffic. Within the network hierarchy, the KSZ8842-PMQL is an Ethernet interface IC and network interface controller that connects a PCI host processor to two 10/100 Base-TX ports. Its managed-switch architecture supports centralized port control, status monitoring, and traffic management in embedded industrial, communications, and legacy PCI systems. Key features include two integrated 10/100 Ethernet ports, a 32-bit PCI interface operating at 33 MHz, IEEE 802.3u compliance, an integrated DMA engine, and a low-power operating design. The PQFP package provides 128 accessible package positions and uses leaded technology for compatibility with established PCI motherboard and embedded-controller assemblies. An industrial-temperature ordering option, KSZ8842-PMQLI, extends the family for applications requiring extended temperature operation. Architecturally, the KSZ8842-PMQL belongs to the KSZ8842 fourth-generation integrated Layer 2 switch family. Separate PCI and non-PCI implementations allow designers to match the host interface to the platform, while the PMQL version retains the 32-bit PCI processor connection. The integrated DMA engine assists efficient packet transfer between the PCI host and switch ports, reducing the processing burden associated with moving Ethernet traffic through host memory. Typical applications include PCI-based industrial controllers, embedded communications appliances, test and measurement systems, legacy PCI server equipment, and custom network interface cards. The device is particularly suitable when two copper Ethernet ports are required without adding an external two-port switch. Designers must also verify the host platform's supported PCI electrical characteristics, bus width, clocking, and software configuration model before releasing a new design. For a new design, route each differential Ethernet pair through a controlled-impedance layout, keep the PHY and magnetics interface routing compact, and follow the manufacturer's reference layout for power, ground, reset, and clock connections. Because this is a legacy PCI bridge with a large leaded package, confirm long-term sourcing and lifecycle status with Microchip before committing to high-volume production. This page combines the exact manufacturer and distributor identification for KSZ8842-PMQL with package, interface, application, and procurement guidance. It also distinguishes the PCI implementation from related non-PCI KSZ8842 members and identifies the temperature-graded PMQLI counterpart for industrial design reviews.

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KSZ8851SNL - 10/100 Ethernet Controller | Microchip
KSZ8851SNL

KSZ8851SNL - 10/100 Ethernet Controller | Microchip

The Microchip Technology KSZ8851SNL is a single-port 10/100 Ethernet controller with a 3.3 V SPI interface, integrated 10/100BASE-T/TX PHY, and Media Access Controller in a 32-pin QFN package measuring 5 mm x 5 mm. It provides 10 Mbps and 100 Mbps Ethernet connectivity for embedded systems using a host microcontroller equipped with an SPI interface. The device also includes one copper port and one uplink port, making it suitable for industrial, communications, building-automation, and networked embedded-control equipment. An Ethernet controller is an interface IC that integrates network-frame handling with physical-layer signaling. The KSZ8851 family combines the PHY and MAC with an SPI host interface, reducing the number of external components required to add wired Ethernet to a microcontroller-based product. This integration places the KSZ8851 within the hierarchy of Ethernet controller, network interface controller, interface IC, and semiconductor. Its SPI host interface supports a compact connection to embedded processors while preserving an independent Ethernet data path. The principal verified features are 10/100BASE-T/TX operation, a 3.3 V supply as identified by the distributor specification snippet, and a 32-pin lead-free QFN package. The integrated controller architecture simplifies firmware and hardware compared with a separated Ethernet MAC and external PHY arrangement. A single-port design also keeps board area and component count controlled, which is valuable in embedded products where connector placement, enclosure volume, and system cost are constrained. Technically, the KSZ8851SNL separates host access from Ethernet processing through its Serial Peripheral Interface. The SPI interface provides a compact communication path for register access, configuration, interrupt handling, and Ethernet data transfer. The integrated PHY handles the physical signaling required for 10/100BASE-T/TX copper networking, while the MAC performs the higher-level frame-processing functions required to present Ethernet traffic to the host processor. Typical applications include industrial Ethernet gateways, building-automation controllers, serial-to-Ethernet equipment, embedded test systems, HMI platforms, and network-connected sensors. It is also appropriate for custom industrial control equipment requiring a dedicated Ethernet port without allocating a high-performance host processor for basic Ethernet connectivity. The 5 mm x 5 mm QFN package supports compact designs, although exposed-pad layout and thermal management remain PCB-level concerns. Designers should follow Microchip's KSZ8851SNL Hardware Design Checklist for power, decoupling, magnetics, differential routing, and copper interface implementation. SPI trace integrity, grounding, and isolation requirements must be reviewed alongside the Ethernet physical layer because the controller is intended for copper-connected industrial networks rather than direct cable attachment without supporting network hardware.

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KSZ8851SNLI - 10/100 Ethernet SPI Controller | Microchip
KSZ8851SNLI

KSZ8851SNLI - 10/100 Ethernet SPI Controller | Microchip

The Microchip Technology KSZ8851SNLI is an industrial-temperature-grade, single-port Fast Ethernet controller integrating a 10/100BASE-T/TX physical-layer transceiver, a Media Access Controller, and a Serial Peripheral Interface in a 32-QFN (5x5 mm) package. It connects a host microcontroller with an SPI interface to copper Ethernet and supports the 10 Mbps and 100 Mbps transfer rates of Fast Ethernet. A Fast Ethernet controller is a network-interface semiconductor that combines physical-layer signaling and higher-level frame processing. Within the product hierarchy, the KSZ8851SNLI is an Ethernet controller interface IC with an integrated Ethernet PHY and MAC. Its SPI host interface provides a practical way to add wired network connectivity to embedded systems without requiring a parallel host bus or a dedicated Ethernet processor. Key device features include a single Ethernet port, integrated 10/100BASE-T/TX PHY, integrated MAC, and an SPI interface. The manufacturer documentation identifies 3.3 V as the main supply and provides 1.8 V, 2.5 V, and 3.3 V options for VDD I/O, allowing the digital interface voltage to be matched more closely to the host microcontroller. The SNLI designation identifies the industrial-temperature-grade version of the KSZ8851SNL family. The KSZ8851SNL family supports SPI, 8-bit, 16-bit, and 32-bit non-PCI CPU interfaces, with package options of 32, 48, and 128 pins. The 32-QFN KSZ8851SNLI is therefore the SPI-oriented option for compact embedded equipment. Integrating the PHY and MAC reduces the number of external Ethernet interface functions required, while the SPI connection limits host-side wiring and allows a microcontroller to manage registers and network traffic through a serial interface. Typical uses include industrial monitoring, networked sensors, building controls, embedded access equipment, and compact gateway products. For these systems, the device can provide a single 10/100 copper port while the host handles application traffic, configuration, and network management. A board design must still provide the required magnetic interface, termination, reference circuitry, clocking, supply rails, and controlled-layout implementation described by the manufacturer hardware checklist. Designers should evaluate the SPI clock and signal-integrity requirements, power-supply sequencing, and Ethernet magnetics together rather than treating the controller as a stand-alone Ethernet jack interface. The 3.3 V supply and selectable 1.8 V, 2.5 V, or 3.3 V VDD I/O levels are important for host compatibility, while the compact 5x5 mm QFN footprint requires a land pattern and thermal strategy appropriate for a leadless package. This page combines the manufacturer identification, SPI and 10/100 Ethernet capabilities, verified-source links, and practical engineering guidance. It also distinguishes the directly documented same-family option from cross-package Ethernet devices, helping engineers make a footprint-aware choice without treating every Ethernet PHY as a drop-in replacement.

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