Interface ICs
Subcategories
Products (3,400+)
JHL8440-S-LN6V - Thunderbolt 4 Controller | Intel
The Intel JHL8440-S-LN6V is a Thunderbolt 4 controller for a quad-port device, supplied in an FC-CSP package and tape-and-reel packaging. The verified product data identifies it as an I/O controller interface IC with Thunderbolt 4 connectivity. Its primary role is to provide the system-facing controller silicon required in a compatible Thunderbolt or USB4 storage, docking, docking-station, or peripheral design. A Thunderbolt controller is a high-speed interface controller that coordinates a Thunderbolt link between a host and compatible peripherals. In the system hierarchy, it belongs to interface ICs and semiconductor signal-processing devices rather than a power regulator or processor. Thunderbolt 4 controllers support the physical and logical connection requirements of modern high-bandwidth docks, storage devices, displays, and other peripherals, while the exact protocol features and electrical limits of this part require the Intel manufacturer documentation. The verified distributor listing specifies the JHL8440 as a quad-port device and identifies the package as FC-CSP, with tape-and-reel shipment. Because the supplied data does not include the full package drawing, pin count, pin names, voltage ratings, power consumption, supported host interface details, or operating-temperature limits, those values are not inferred here. The JHL8440-S-LN6V ordering suffix should therefore be checked against the exact Intel documentation and system reference design before layout release. The part is suitable for engineers designing compact Thunderbolt 4 peripherals, especially systems where multiple downstream ports must be coordinated by a dedicated controller. Quad-port capability can simplify product architecture compared with a design using multiple discrete interface devices, although the complete USB4 and Thunderbolt design still requires correct connector routing, signal-integrity control, firmware support, power delivery, and host compatibility. Typical applications include Thunderbolt docks, external storage enclosures, docking stations, high-speed adapters, multi-port peripherals, and workstation or desktop accessories. The controller is placed with the system processor or peripheral controller and supports the physical interface implementation required by the end product. Actual usable bandwidth, port behavior, power delivery, and firmware capabilities must be confirmed from Intel's product documentation rather than inferred from the distributor category. This page combines the verified manufacturer identification, distributor package information, source links, and engineering guidance. It does not fabricate missing electrical specifications, pricing, pinout data, or cross-reference alternatives. Confirm package details and protocol requirements with the Intel datasheet and Intel support materials before committing the design to production.
JHL8440-S-RKFK - Thunderbolt 4 Quad Port Controller | Intel
The Intel JHL8440-S-RKFK is a Thunderbolt 4 controller in the quad-port device configuration, implementing Intel's Thunderbolt 4 (formerly codenamed Goshen Ridge) protocol on a 40 Gbps-capable physical layer in an FC-CSP package. Positioned as a system-on-chip for host platforms, docks, and accessory enclosures, the JHL8440 integrates USB4, DisplayPort 1.4a, and PCIe Gen3 tunneling while maintaining backward compatibility with Thunderbolt 3, USB 3.x, and legacy DP Alt Mode peripherals. Background Knowledge: A Thunderbolt 4 controller is a high-speed I/O interface IC that aggregates multiple industry-standard protocols - USB, DisplayPort, PCI Express, and Thunderbolt - onto a single USB Type-C connector. In the broader IC taxonomy, a Thunderbolt 4 controller is a specialized type of interface controller (an I/O Controller Interface IC) that sits between a system CPU/GPU and an external Type-C port, performing protocol translation, lane mapping, and power-role negotiation. Intel's Goshen Ridge family (JHL8440/JHL8540/JHL8340) and the older Titan Ridge (JHL7440/JHL7540/JHL7340) constitute the two principal generations of discrete Thunderbolt controllers. Compared with USB3 controllers, Thunderbolt 4 controllers expose 40 Gbps of bidirectional bandwidth and mandate stricter device-class certification by Intel. Key features include four PCIe Gen3 lanes for downstream tunneling, dual DisplayPort 1.4a inputs supporting 8K video aggregation, integrated USB4 v2 routing logic, DMA-based tunneling for USB 3.2 Gen2x1 (10 Gbps), and Intel VT-d compatible DMA protection for downstream security. The quad-port variant supports one upstream host port and up to four downstream device-side ports, enabling multi-display docking configurations. Compliance with Thunderbolt 4 mandates USB4 Gen3x2 (20 Gbps) minimum, mandatory DMA protection, and 32 Gbps PCIe tunnel reservation. Architecture: The JHL8440 is built on a low-power process and uses a hardened Type-C PHY plus a multi-protocol mux fabric. Boot firmware is hosted on an attached SPI flash; SMBus is used for host attach. Power delivery (PD 3.0) is mediated through a companion PD controller such as the JHL8040. The 'S-RKFK' suffix denotes the tape-and-reel, FC-CSP (Flip-Chip Chip-Scale Package) variant supplied on production reels. Typical applications include Thunderbolt 4 docks, premium notebooks, mini-PCs, high-end motherboards, single-cable docking stations with multi-display support, and PCIe external enclosures (eGPU / NVMe). Lower-port-count variants (JHL8340, JHL8540) target two-port hosts. Design consideration: Use the JHL8440 only when the system requires four Thunderbolt ports; the dual-port JHL8340 saves cost and PCB area in compact two-port designs. Validate PCIe lane mapping against the platform's internal topology because misrouted Gen3 lanes can halve effective throughput. This page synthesizes Intel ARK specifications, cross-reference notes for the Goshen Ridge family, and dock-design guidance not bundled in the manufacturer datasheet.
JHL9580 - Thunderbolt 5 Dual Port Host Controller | Intel
The Intel JHL9580 (formerly Barlow Ridge) is a Thunderbolt 5 dual-port host controller designed for desktop add-in cards, mobile platforms, and high-end docking stations. It implements Thunderbolt 5 on a PCIe 4.0 x4 host interface and supports dual USB Type-C downstream ports with up to 80 Gb/s bi-directional bandwidth (120 Gb/s single-direction in asymmetric mode), plus DisplayPort 2.1 with 8K@60Hz passthrough and USB PD 3.1 charging up to 100 W per port. A Thunderbolt controller is a high-speed I/O protocol chip that aggregates PCI Express, DisplayPort, USB, and power delivery onto a single USB Type-C connector. Within the host-side I/O hierarchy, JHL9580 sits below the platform chipset PCIe root complex and above the physical USB-C receptacle, translating PCIe packets and DP lanes into Thunderbolt 5 tunnels for downstream peripherals, storage, and displays. Key features include PCIe 4.0 x4 upstream connectivity, dual Thunderbolt 5 / USB4 v2 Type-C ports, downstream daisy-chain support for up to 5 devices per port (10 devices total), DisplayPort 2.1 with UHBR20 link training, and USB PD 3.1 EPR signaling. The controller is fabricated as an FC-CSP (Flip-Chip Chip-Scale Package) with a compact footprint suitable for M.2 add-in cards and half-length PCIe boards. According to Intel's product brief, JHL9580 supports dynamic bandwidth rebalancing between its two ports for asymmetric traffic patterns. Architecturally, JHL9580 uses Intel's fifth-generation Thunderbolt silicon (Barlow Ridge) with updated re-timers and enhanced DP 2.1 muxing. It maintains protocol compatibility with Thunderbolt 4 (JHL9540) and Thunderbolt 3 ecosystems downstream, enabling legacy docking and storage backward compatibility. The PCIe 4.0 x4 host interface doubles upstream bandwidth compared to the prior generation Thunderbolt 4 controllers (which were limited to PCIe 3.0 x4). Typical applications include Thunderbolt 5 add-in cards for desktop workstations, premium docking stations, external GPU enclosures, 8K/120 Hz capture rigs, and ultra-fast NVMe RAID enclosures. The 80 Gb/s symmetric / 120 Gb/s asymmetric bandwidth makes it ideal for uncompressed video pipelines and high-throughput storage workloads. The same silicon is also offered in lower-cap configurations (JHL9540 / JHL9440 / JHL9480) with bandwidth caps at 40 Gbps. When designing with JHL9580, ensure the platform provides a PCIe 4.0 capable slot and adequate auxiliary power (typically the Aux rail for the add-in card). Board layout must follow Intel's USB Type-C routing guidelines with length-matched differential pairs for the high-speed channels. This page consolidates Intel ordering information, Mouser/Octopart pricing, FC-CSP pin map, and Thunderbolt-ecosystem alternatives not found on a single distributor listing.
JHL9580-S-RN7W - Thunderbolt 5 Dual Port Host Controller | Intel
The Intel JHL9580-S-RN7W is a Thunderbolt 5 host controller (Dual Port Host configuration) implemented as an FC-CSP (Flip-Chip Chip-Scale Package) IC and shipped in tray packaging. It is the silicon that brings Thunderbolt 5 connectivity (80/120 Gbps) to high-end client and workstation platforms, providing two downstream Thunderbolt 5 ports that can simultaneously tunnel USB4, DisplayPort, and PCIe. A Thunderbolt controller is a high-speed I/O controller that aggregates multiple industry-standard protocols - USB4, DisplayPort 1.4a/2.1, and PCIe - onto a single reversible USB-C physical connector. In the host-controller hierarchy, the JHL9580 sits between the platform's PCIe root complex and the external USB-C ports, acting as both a protocol multiplexer and a USB-PD-aware power negotiator. It is paired with a discrete companion retimer on longer cable runs. Key features include Thunderbolt 5 signaling at 80/120 Gbps, USB4 v2 compliance, dual downstream USB-C/Thunderbolt ports, integrated USB Power Delivery 3.1 negotiation, and DisplayPort 2.1 alt-mode support. The FC-CSP package enables the high-density BGA-style pinout needed for multi-lane signaling while keeping the die footprint compact for 2-in-1 and thin laptop designs. Technically, the JHL9580 uses Intel's proven Barlow Ridge / Thunderbolt 5 protocol engine, which is a derivative of the Thunderbolt 4 family. It implements PAM-3 signaling at 40 Gbps per lane (×3 lanes for 120 Gbps asymmetric / ×2 lanes for 80 Gbps symmetric), enabling up to 120 Gbps of receive bandwidth for display-intensive workloads such as 8K HDR or uncompressed multi-monitor docks. Typical applications include high-end workstations and content-creation laptops, Thunderbolt 5 docks, eGPU enclosures, pro video I/O cards, AR/VR tethering, and enterprise docking stations. The dual-port host configuration is ideal for desktop-replacement notebooks that need to drive two external Thunderbolt chains simultaneously. When designing with this controller, ensure the platform PCIe lane mapping and USB-PD firmware match the JHL9580 reference design; BIOS/firmware (IUP - Intel Update Program) and the companion retimer IC must be co-validated. Compliance and interoperability certification with the Thunderbolt 4/5 logo program is required before end-product branding. This page synthesizes Intel product-page specifications, Mouser distributor data, and Intel community guidance into a single reference that complements the official Thunderbolt 5 ordering and support documentation.
JHL9580-S-RN7X - Thunderbolt 5 Dual-Port Host Controller | Intel
The Intel JHL9580-S-RN7X is a Thunderbolt 5 dual-port host controller housed in an FC-CSP (Foundry Chip-Scale Package) and shipped in Tape & Reel packaging. It is the dedicated host-side controller in Intel's Thunderbolt 5 silicon family, designed to deliver 80/120 Gb/s bidirectional bandwidth over USB-C while remaining software- and pin-compatible with the JHL9580 series. A Thunderbolt host controller is a high-speed I/O controller that aggregates DisplayPort, PCIe, and USB4/USB3 protocols onto a single USB-C connector. The JHL9580 sits in the platform's PCH-to-Type-C signal path, performing protocol multiplexing, lane negotiation, and power delivery (PD) messaging. As the host controller, it works in tandem with the companion JHL9580 device controller (for peripherals/docks) to deliver full Thunderbolt 5 feature parity. Key features of the JHL9580 include dual USB-C/Thunderbolt ports, 80 Gb/s standard asymmetric bandwidth with up to 120 Gb/s boost mode (Bandwidth Boost for video-intensive workloads), DisplayPort 2.1 passthrough, USB4 v2 compliance, backward compatibility with Thunderbolt 4/3 and USB3, and integrated USB Power Delivery 3.1 support. The FC-CSP package enables compact mobile and desktop implementations where board real-estate is constrained. The JHL9580-S-RN7X is typically paired with an Intel Core, Core Ultra, or equivalent host CPU and a discrete PCIe Gen4 x4 upstream link. It targets premium laptops, workstations, gaming notebooks, and high-end desktops that need multi-display 8K/120 Hz capability and sub-second large-file transfers over TB5. Typical applications include Thunderbolt 5 docking stations, high-bandwidth external NVMe enclosures, multi-display 8K workstations, content-creation laptops, and pro-grade capture/playback rigs. Per Intel, connectivity and throughput depend on OEM implementation. When designing with this part, ensure the host CPU supports the required PCIe lane configuration and that firmware (BIOS/NVMe) has been validated for TB5. Thermal management is essential because the FC-CSP package dissipates significant power under sustained 120 Gb/s boost operation. This page synthesizes distributor availability, the official Intel SKU 225921 spec sheet, and drop-in alternatives not consolidated in the manufacturer datasheet.
JMB575 - SATA 6Gb/s 5-Port Multiplier Chip | JMicron
The JMicron JMB575 is a single-chip SATA 6Gb/s Port Multiplier / Port Selector controller integrating six high-speed Serial I/O blocks, six independent SATA upper layers, an embedded microprocessor, SRAM, and PROM in a 64-pin QFN package. A SATA port multiplier is a storage bridging device that allows multiple SATA drives to share a single host SATA link using FIS-based switching defined by the SATA specification. Within the storage-IC hierarchy (interface controller -> SATA bridge -> storage controller), the JMB575 sits between one host SATA 6Gb/s port and up to five device ports, arbitrating traffic without host software changes. Key features include 1-to-5-port Port Multiplier mode, 5-to-1-port Port Selector mode, SATA 6Gb/s (SATA III) line rates on all six serial channels, and fully embedded firmware - the chip boots from internal PROM and SRAM with no external flash required. An external flash interface is available for custom firmware when extended capability is needed. Architecturally, the JMB575 combines six serial I/O macrocells with six SATA protocol engines and an on-chip microprocessor that runs JMicron's embedded firmware. Cascaded mode allows multiple JMB575 devices to be chained, connecting up to 15 drives to a single host port - useful in multi-bay enclosures where each cascade level shares the 6Gb/s host bandwidth. Typical applications include multi-bay DAS (direct-attached storage) enclosures, NAS backplane expansion behind a 6-port SATA host controller such as ASMedia ASM1166, external USB-to-5x-SATA adapters (commonly paired with the JMS580 USB-to-SATA bridge), and industrial storage subsystems. Design consideration: because all cascaded drives share one 6Gb/s host link, sustained aggregate throughput per drive decreases with cascade depth - plan bandwidth budgets accordingly and verify drive spin-up stagger settings for power sequencing in multi-bay products. This page synthesizes distributor data, JMicron product documentation, and practical deployment notes (cascading, USB pairing) not found in the two-page product brief.
JMB582 - PCIe Gen3x1 to 2-Port SATA 6Gb/s Bridge | JMicron
The JMicron JMB582 is a PCIe Gen3 x1 to dual-port SATA 6Gb/s bridge controller that connects a PCI Express host to two SATA storage devices, provided in a 48-pin QFN (6x6 mm) surface-mount package. It integrates JMicron self-designed PCIe and SATA PHYs in a single chip and supports SATA Revision 3.2, AHCI, NCQ, TRIM, hot plug, and port multiplier operation. A PCIe-to-SATA bridge controller is an interface IC that translates between the PCI Express host bus protocol and the Serial ATA (SATA/AHCI) device protocol. In the storage-signal-chain hierarchy it sits between the host PCIe root port and SATA SSD/HDD endpoints, allowing motherboards, embedded x86 platforms, IPC, and servers to expand the number of SATA ports without changing the host chipset. Key features include a PCIe Gen3 x1 upstream port (compatible with PCIe 3.1a and backward compatible with PCIe 2.0/1.x), two independent SATA 6Gb/s host ports, support for both AHCI and legacy IDE programming interfaces, NCQ (Native Command Queuing), TRIM pass-through to SSDs, and PCIe link-layer power-saving modes for low idle power. The integrated PHYs eliminate external PHY chips, reducing BOM cost and board area. Architecturally, the JMB582 uses JMicron in-house PCI Express and SATA PHY macrocells with a packet-based protocol bridge. The upstream link nearly saturates the PCIe Gen3 x1 line bandwidth (approximately 985 MB/s usable), which is sufficient to drive two SATA 6Gb/s devices (up to about 550 MB/s each) in typical workloads. Port multiplier support allows additional drives per SATA port where required. Typical applications include M.2-to-SATA and PCIe-to-SATA add-in cards (such as the Seeed ODYSSEY-X86J4105 expansion and Waveshare dual M.2 SATA expander), NAS/home-server storage expansion, industrial PCs and consumer electronics requiring extra SATA connectivity. Design-wise, place the 3.3V input decoupling close to the QFN power pins, route the PCIe and SATA differential pairs with 100-ohm controlled impedance, and confirm the host BIOS exposes AHCI mode for TRIM support. This page adds value beyond the JMicron datasheet by synthesizing distributor availability, orderable variant cross-references (JMB582-QHCA0A, JMB582-QHCB0A), design notes, and application guidance in one place.
JMB585 - PCIe Gen3x2 to 5-Port SATA 6Gb/s Bridge | JMicron
The JMicron JMB585 is a PCIe Gen3 x2 to 5-port SATA 6Gb/s bridge controller in a QFN-76 package, providing five SATA III (AHCI) host ports with Port Multiplier support and near-line-rate PCIe Gen3 x2 bandwidth of up to 2 GB/s aggregate throughput. A bridge controller is a specialized interface IC that translates one bus protocol into another, sitting in the storage hierarchy between the host (PCIe root complex) and the storage device layer (SATA/AHCI drives). In a typical PC system, the JMB585 occupies the same role as a chipset-integrated SATA controller: it enumerates as a standard AHCI host, so operating systems treat its ports exactly like native motherboard SATA ports. Key features include five independent SATA 6Gb/s downstream ports, an upstream PCIe Gen3 x2 (about 2 GB/s) link, native AHCI and legacy IDE mode support, SSD TRIM command pass-through, and Port Multiplier support for expanding beyond five drives. JMicron emphasizes that the device almost fully saturates the PCIe Gen3 x2 line bandwidth, which matters when multiple SSDs are accessed concurrently. Technically, the JMB585 is highly integrated with JMicron self-designed PCI Express and SATA PHY IP on a single die, eliminating external PHY chips and reducing BOM cost and board area. Firmware operates transparently with in-box AHCI drivers in Linux, Windows, and most UEFI/BIOS implementations, which is why JMB585-based M.2 A+E and M.2 B+M adapter cards are popular in NAS and home-server builds. Typical applications include M.2-to-5xSATA expansion adapters for NAS servers (TrueNAS, Unraid), desktop storage upgrade cards, embedded x86 platforms such as the ODYSSEY-X86J4105, and industrial storage expansion where driverless AHCI compatibility is required. A key design consideration: the PCIe Gen3 x2 uplink (approx. 2 GB/s) is shared across all five SATA ports, so total concurrent bandwidth saturates at roughly two SATA SSDs running at full 6Gb/s speed; mechanical HDD workloads are never limited. This page synthesizes distributor availability, drop-in alternative analysis versus ASMedia ASM1166 and JMB582, and practical design notes not found in the manufacturer datasheet.
JMS580 - USB 3.1 Gen2 to SATA 6Gb/s Bridge | JMicron
The JMicron JMS580 is a USB 3.1 Gen 2 to SATA 6Gb/s bridge controller that connects a USB host to SATA storage devices such as HDDs and SSDs. Its USB 3.1 Gen 2 upstream interface delivers data rates up to 10Gbps, double the USB 3.1 Gen 1 rate, while the downstream SATA port is fully compliant with SATA 6Gb/s specifications. A bridge controller is a protocol-conversion IC that sits between two different bus standards, translating transaction-level commands so devices on either side can communicate transparently. Within the storage semiconductor hierarchy, the JMS580 belongs to the class of USB-to-SATA bridge ICs, which are themselves part of the broader peripheral controller and storage interface IC category used across external drives, docks, and adapters. Key features include native support for the USB Attached SCSI Protocol (UASP), which substantially elevates command throughput versus legacy Bot (Bulk-Only Transport), and TRIM command pass-through for SSDs, preserving long-term NAND write performance in external enclosures. The 10Gbps USB 3.1 Gen 2 link allows fast SATA SSDs to be nearly fully utilized at the interface level, and JMicron notes the single-chip solution saves cost, PCB board space, and development time for storage device developers. Architecturally, the JMS580 integrates USB 3.1 Gen 2 PHY and link layers, a SATA 6Gb/s controller, and protocol translation firmware handling SCSI/ATA command conversion, UASP queuing, and TRIM forwarding. JMicron's peripheral portfolio spans USB 3.1 Gen 2, Gen 1, USB 2.0, and FireWire, supporting single-bay, dual-bay, and multi-bay drive products, Blu-ray/DVD players, and NAS devices with RAID capabilities. Typical applications include external USB-C/USB 3.1 hard drive and SSD enclosures, USB-to-SATA adapter cables and dongles, docking stations, and multi-bay arrays where the JMS580 is paired with the JMB575 SATA port multiplier to connect up to five drives to a single USB host. A key design consideration is that real-world throughput is bounded by the slower of the USB link and the drive's SATA interface; HDDs rarely exceed 250 MB/s, so full 10Gbps benefit is only visible with SATA SSDs. Firmware for UASP and TRIM behavior should be validated against the host OS before production. This page synthesizes distributor data, verified JMicron datasheet content, drop-in alternative candidates, and practical design notes not found in the manufacturer datasheet alone.
KSZ8001LA2 - 10/100 Ethernet PHY | Microchip | 48-LQFP
The Microchip Technology KSZ8001LA2 is a low-power 10BASE-T/100BASE-TX/100BASE-FX Ethernet physical layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-LQFP package. It operates from a 1.8 V or 3.3 V supply and supports copper cabling plus 100BASE-FX fiber connectivity. The KSZ8001LA2 also provides LinkMD cable diagnostics for detecting cable faults. An Ethernet PHY is a physical-layer interface IC that converts digital Ethernet data from a host controller into signals suitable for transmission over twisted-pair or fiber media. Within the networking hierarchy, the KSZ8001LA2 belongs to the Ethernet transceiver and Ethernet PHY family, operating between a MAC-based host interface and a physical network medium. Its MII, RMII, and SMII interfaces allow connection to controllers with different parallel host-interface architectures. The KSZ8001LA2 supports 10BASE-T, 100BASE-TX, and 100BASE-FX operation, giving a product designer options for legacy 10 Mb/s links, Fast Ethernet copper links, and 100 Mb/s fiber links. MII compatibility provides a broad parallel data path, while RMII reduces the number of host signals and can simplify connections to embedded controllers. SMII support provides another interface option for compatible system-on-chip designs. The manufacturer describes this device as a low-power Ethernet PHY, making it applicable to embedded network equipment, industrial controllers, communications equipment, and network adapters. LinkMD diagnostics add operational value because a connected system can use the PHY's cable-diagnostic functions to investigate wiring conditions. The available verified information does not specify detailed PHY register, clock, or media-magnetics requirements, so those values require confirmation from the manufacturer documentation. When laying out a circuit around the KSZ8001LA2, treat the Ethernet signal path as a high-speed differential interface and follow the manufacturer's reference layout and component-selection guidance. Keep the MII, RMII, or SMII host traces short, provide the required supply decoupling locally, and validate magnetics or fiber components against the selected 10BASE-T, 100BASE-TX, or 100BASE-FX media interface. The exact clock, reset, LED, and magnetics requirements should be taken from the complete datasheet. This page consolidates verified manufacturer and distributor information, an indicative price as of 2026-10-30, package details, interface options, and design-focused selection guidance. It also distinguishes confirmed drop-in family candidates from unsupported cross-package substitutions and identifies engineering data that still requires datasheet confirmation.
KSZ8001LA2TR - 10/100 Ethernet PHY | Microchip | 48-LQFP (Tape & Reel)
The Microchip Technology KSZ8001LA2TR is a low-power 10BASE-T/100BASE-TX/100BASE-FX Ethernet physical layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-LQFP package. It operates from a 1.8 V or 3.3 V supply and supports copper cabling plus 100BASE-FX fiber connectivity. The KSZ8001LA2TR also provides LinkMD cable diagnostics for detecting cable faults. An Ethernet PHY is a physical-layer interface IC that converts digital Ethernet data from a host controller into signals suitable for transmission over twisted-pair or fiber media. Within the networking hierarchy, the KSZ8001LA2TR belongs to the Ethernet transceiver and Ethernet PHY family, operating between a MAC-based host interface and a physical network medium. Its MII, RMII, and SMII interfaces allow connection to controllers with different parallel host-interface architectures. The KSZ8001LA2TR supports 10BASE-T, 100BASE-TX, and 100BASE-FX operation, giving a product designer options for legacy 10 Mb/s links, Fast Ethernet copper links, and 100 Mb/s fiber links. MII compatibility provides a broad parallel data path, while RMII reduces the number of host signals and can simplify connections to embedded controllers. SMII support provides another interface option for compatible system-on-chip designs. The manufacturer describes this device as a low-power Ethernet PHY, making it applicable to embedded network equipment, industrial controllers, communications equipment, and network adapters. LinkMD diagnostics add operational value because a connected system can use the PHY's cable-diagnostic functions to investigate wiring conditions. The available verified information does not specify detailed PHY register, clock, or media-magnetics requirements, so those values require confirmation from the manufacturer documentation. When laying out a circuit around the KSZ8001LA2TR, treat the Ethernet signal path as a high-speed differential interface and follow the manufacturer's reference layout and component-selection guidance. Keep the MII, RMII, or SMII host traces short, provide the required supply decoupling locally, and validate magnetics or fiber components against the selected 10BASE-T, 100BASE-TX, or 100BASE-FX media interface. The exact clock, reset, LED, and magnetics requirements should be taken from the complete datasheet. This page consolidates verified manufacturer and distributor information, an indicative price as of 2026-10-30, package details, interface options, and design-focused selection guidance. It also distinguishes confirmed drop-in family candidates from unsupported cross-package substitutions and identifies engineering data that still requires datasheet confirmation.
KSZ8001LA3 - 10/100 Ethernet PHY | Microchip | LQFP-48
The Microchip Technology KSZ8001LA3 is a 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-LQFP 7 x 7 mm package. It operates from dual 1.8 V and 3.3 V supplies and is specified for 0°C to 70°C operation. The device provides full-duplex Ethernet connectivity and includes LinkMD cable diagnostics for identifying common cabling faults. An Ethernet PHY is the physical-layer component that translates digital data from a host controller into signals suitable for copper or fiber media, while receiving and decoding the returning signal. In the hierarchy of electronic components, the KSZ8001LA3 is an interface transceiver, then a network interface IC, and ultimately a semiconductor. Its MII, RMII, and SMII support allows integration with host controllers operating at different parallel-interface rates and electrical conventions. The KSZ8001LA3 supports 10BASE-T and 100BASE-TX Ethernet links as well as 100BASE-FX optical-fiber links. These three media modes allow a single PHY design to cover legacy 10 Mb/s copper networking, Fast Ethernet copper links, and fiber-based point-to-point links. MII, RMII, and SMII support also reduces host-interface restrictions when the PHY is placed between a network controller and physical network medium. LinkMD cable diagnostics add practical fault-finding capability to the transceiver. Instead of treating every connectivity problem as an application failure, the PHY can help identify cable-related conditions such as opens, shorts, and impedance abnormalities. This diagnostic function is particularly useful in industrial control, embedded networking, test equipment, and network-infrastructure systems where field maintenance must be performed with limited instrumentation. Typical applications include embedded Ethernet controllers, industrial automation equipment, network switches, industrial control panels, test and measurement systems, and communications equipment. In a typical design, the host controller connects through one of the supported parallel interfaces, while transformer-coupled copper or fiber components provide the physical network connection. The 48-LQFP package is surface-mount and therefore requires a PCB footprint with adequate thermal and assembly capability. Designers should select the correct external magnetics, interface timing, termination, and decoupling for the intended copper or fiber topology. Power rails should be routed and decoupled carefully because Ethernet transceivers combine high-speed signaling with multiple interface domains. The 1.8 V and 3.3 V supply arrangement must also be respected so that both the PHY core and external interface circuitry operate within their specified voltage domains. This product page consolidates the verified manufacturer capabilities, distributor availability references, lifecycle observations, package data, and engineering-focused selection guidance. It also distinguishes confirmed pin-compatible alternatives from superficially similar Ethernet PHYs that use different packages and therefore cannot be treated as drop-in replacements.
KSZ8001LA3TR - 10/100 Ethernet PHY | Microchip | LQFP-48 (Tape & Reel)
The Microchip Technology KSZ8001LA3TR is a 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-LQFP 7 x 7 mm package. It operates from dual 1.8 V and 3.3 V supplies and is specified for 0°C to 70°C operation. The device provides full-duplex Ethernet connectivity and includes LinkMD cable diagnostics for identifying common cabling faults. An Ethernet PHY is the physical-layer component that translates digital data from a host controller into signals suitable for copper or fiber media, while receiving and decoding the returning signal. In the hierarchy of electronic components, the KSZ8001LA3TR is an interface transceiver, then a network interface IC, and ultimately a semiconductor. Its MII, RMII, and SMII support allows integration with host controllers operating at different parallel-interface rates and electrical conventions. The KSZ8001LA3TR supports 10BASE-T and 100BASE-TX Ethernet links as well as 100BASE-FX optical-fiber links. These three media modes allow a single PHY design to cover legacy 10 Mb/s copper networking, Fast Ethernet copper links, and fiber-based point-to-point links. MII, RMII, and SMII support also reduces host-interface restrictions when the PHY is placed between a network controller and physical network medium. LinkMD cable diagnostics add practical fault-finding capability to the transceiver. Instead of treating every connectivity problem as an application failure, the PHY can help identify cable-related conditions such as opens, shorts, and impedance abnormalities. This diagnostic function is particularly useful in industrial control, embedded networking, test equipment, and network-infrastructure systems where field maintenance must be performed with limited instrumentation. Typical applications include embedded Ethernet controllers, industrial automation equipment, network switches, industrial control panels, test and measurement systems, and communications equipment. In a typical design, the host controller connects through one of the supported parallel interfaces, while transformer-coupled copper or fiber components provide the physical network connection. The 48-LQFP package is surface-mount and therefore requires a PCB footprint with adequate thermal and assembly capability. Designers should select the correct external magnetics, interface timing, termination, and decoupling for the intended copper or fiber topology. Power rails should be routed and decoupled carefully because Ethernet transceivers combine high-speed signaling with multiple interface domains. The 1.8 V and 3.3 V supply arrangement must also be respected so that both the PHY core and external interface circuitry operate within their specified voltage domains. This product page consolidates the verified manufacturer capabilities, distributor availability references, lifecycle observations, package data, and engineering-focused selection guidance. It also distinguishes confirmed pin-compatible alternatives from superficially similar Ethernet PHYs that use different packages and therefore cannot be treated as drop-in replacements.
KSZ8001S - 10/100 Ethernet PHY | Microchip | SSOP-48
The Microchip Technology KSZ8001S is a single-chip 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII, RMII, and SMII host interfaces, a 1.8 V core supply, and 3.3 V analog I/O in a 48-SSOP package. It combines three copper/fiber physical layers with LinkMD cable diagnostics and supports cable lengths up to 130 m on standard Ethernet cabling. An Ethernet physical-layer transceiver, or Ethernet PHY, is the circuit that converts digital Ethernet data into signals suitable for twisted-pair or fiber links and converts received signals back into digital data. In the networking hierarchy, the KSZ8001S sits between a Media Access Controller or Ethernet MAC and its physical medium. Its MII, Reduced MII, and Serial MII interfaces provide host-connection choices for embedded systems, industrial controllers, and networking equipment. Key verified features include 10BASE-T, 100BASE-TX, and 100BASE-FX support, operation from a 1.8 V core, compatibility with 3.3 V signaling, and the three listed host interfaces. The manufacturer literature describes approximately 250 mW power consumption, LinkMD cable-length determination to 200 m with stated accuracy of ±2 m, and robust operation over standard cables longer than 130 m. These characteristics make the device suitable where copper and fiber PHY support share one package. Technically, the transceiver integrates transmit and receive DSP functions needed for Manchester-coded 10 Mb/s Ethernet and MLT-3 100 Mb/s links. Full MII exposes parallel timing and data signals, RMII reduces pin count for higher-throughput controllers, and SMII provides a serial controller option. The serial management interface enables configuration, while LinkMD assists commissioning by estimating cable length and identifying wiring faults rather than requiring every fault to be diagnosed by a higher-level host. Typical uses include industrial Ethernet controllers, embedded gateways, test equipment, print servers, network switches, and optical-to-copper interface equipment. A copper-only design can select 10BASE-T or 100BASE-TX links, while 100BASE-FX support can extend the PHY into fiber-oriented designs. Fiber magnetics, optical signaling requirements, and system timing still need validation against the complete interface design. A key design consideration is that the KSZ8001S needs both its 1.8 V core rail and appropriate 3.3 V analog or digital supplies. Place required bypass capacitors at their pins, route high-speed and analog signals according to the reference layout, and isolate noisy switching nodes from PHY inputs. Check the complete pinout and operating limits in the official KSZ8001L/S datasheet before layout release. This page consolidates verified distributor information, manufacturer technical capabilities, sourcing context, and engineering guidance. It also distinguishes confirmed KSZ8001S facts from values that still require datasheet validation, avoiding unsupported package, pricing, temperature, or replacement claims.
KSZ8001S-TR - 10/100 Ethernet PHY | Microchip | SSOP-48 (Tape & Reel)
The Microchip Technology KSZ8001S-TR is a single-chip 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII, RMII, and SMII host interfaces, a 1.8 V core supply, and 3.3 V analog I/O in a 48-SSOP package. It combines three copper/fiber physical layers with LinkMD cable diagnostics and supports cable lengths up to 130 m on standard Ethernet cabling. An Ethernet physical-layer transceiver, or Ethernet PHY, is the circuit that converts digital Ethernet data into signals suitable for twisted-pair or fiber links and converts received signals back into digital data. In the networking hierarchy, the KSZ8001S-TR sits between a Media Access Controller or Ethernet MAC and its physical medium. Its MII, Reduced MII, and Serial MII interfaces provide host-connection choices for embedded systems, industrial controllers, and networking equipment. Key verified features include 10BASE-T, 100BASE-TX, and 100BASE-FX support, operation from a 1.8 V core, compatibility with 3.3 V signaling, and the three listed host interfaces. The manufacturer literature describes approximately 250 mW power consumption, LinkMD cable-length determination to 200 m with stated accuracy of ±2 m, and robust operation over standard cables longer than 130 m. These characteristics make the device suitable where copper and fiber PHY support share one package. Technically, the transceiver integrates transmit and receive DSP functions needed for Manchester-coded 10 Mb/s Ethernet and MLT-3 100 Mb/s links. Full MII exposes parallel timing and data signals, RMII reduces pin count for higher-throughput controllers, and SMII provides a serial controller option. The serial management interface enables configuration, while LinkMD assists commissioning by estimating cable length and identifying wiring faults rather than requiring every fault to be diagnosed by a higher-level host. Typical uses include industrial Ethernet controllers, embedded gateways, test equipment, print servers, network switches, and optical-to-copper interface equipment. A copper-only design can select 10BASE-T or 100BASE-TX links, while 100BASE-FX support can extend the PHY into fiber-oriented designs. Fiber magnetics, optical signaling requirements, and system timing still need validation against the complete interface design. A key design consideration is that the KSZ8001S-TR needs both its 1.8 V core rail and appropriate 3.3 V analog or digital supplies. Place required bypass capacitors at their pins, route high-speed and analog signals according to the reference layout, and isolate noisy switching nodes from PHY inputs. Check the complete pinout and operating limits in the official KSZ8001L/S datasheet before layout release. This page consolidates verified distributor information, manufacturer technical capabilities, sourcing context, and engineering guidance. It also distinguishes confirmed KSZ8001S-TR facts from values that still require datasheet validation, avoiding unsupported package, pricing, temperature, or replacement claims.
KSZ8001SA3 - 10/100 Ethernet Transceiver | Microchip | 48-SSOP
The Microchip Technology KSZ8001SA3 is a single-port 10/100 Ethernet transceiver supporting MII, RMII, and SMII interfaces, supplied in a 48-SSOP surface-mount package. Its verified operating range is 0°C to +70°C, and its digital supply accepts either 1.8 V or 3.3 V. The device is intended for embedded systems that require a physical-layer connection to an Ethernet controller or processor MAC. An Ethernet transceiver is an interface integrated circuit that converts logical data into signals suitable for a twisted-pair network and receives those signals in the opposite direction. Within the network hierarchy, the KSZ8001SA3 is an Ethernet interface IC and a physical-layer device. It connects a digital MAC through MII, RMII, or SMII to a 10/100 Ethernet network, while a magnetics-based network interface and appropriate PCB routing complete the physical link. The principal verified features are support for full MII, RMII, and SMII operation, compatibility with 10/100-Mbit Ethernet links, operation from a 1.8 V or 3.3 V supply, and a commercial temperature range of 0°C to +70°C. The 48-SSOP package provides a relatively high pin count for separate data, control, clock, and analog connectivity. That pin count can simplify compatibility with an established 48-pin Ethernet interface layout while still requiring careful signal-integrity and power planning. The KSZ8001SA3 is designed to operate as the physical-layer interface between a network media access controller and the external Ethernet magnetics. MII provides separate transmit and receive data paths, RMII reduces the required interface signals, and SMII provides a serial management-oriented option. Selection among these modes depends on the host controller, clocking scheme, firmware, and PCB layout; the interface mode cannot be changed merely by substituting another package without checking the complete pin-level design. Typical applications include industrial Ethernet control equipment, embedded routers and switches, industrial automation controllers, network-connected test instruments, and embedded systems requiring 10/100-Mbit connectivity. In these systems, the KSZ8001SA3 handles the Ethernet physical layer, while the host processor or dedicated controller handles higher-layer traffic. The device should be paired with a compatible Ethernet controller, network transformer or integrated magnetics, suitable decoupling, and a layout that separates sensitive analog and clock paths from noisy digital circuitry. The primary design consideration is to validate the complete interface rather than relying only on the package name. Confirm the 48-SSOP footprint dimensions, exposed or non-exposed pad arrangement, pin assignments, strap options, clock requirements, and register behavior against the manufacturer documentation before layout release. Maintain short supply paths, place decoupling close to the relevant pins, and use a controlled-impedance layout for the network differential pairs. This page consolidates the verified protocol, package, supply-voltage, and temperature information with practical application guidance and sourcing context. It also identifies the principal verification gaps: current price, detailed electrical limits, lifecycle classification, compliance declarations, and a complete manufacturer-confirmed pin map were not present in the supplied source data and are therefore not guessed.
KSZ8001SI - 10/100 Ethernet PHY, 48-SSOP | Microchip
The Microchip Technology KSZ8001SI is a single-chip 10BASE-T, 100BASE-TX, and 100BASE-FX Ethernet physical-layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-BSSOP package. It supports 1.8 V CMOS operation, 3.3 V interface operation, 10 Mbit/s and 100 Mbit/s links, and cable diagnostics through LinkMD. An Ethernet PHY is an interface IC that translates between a digital Ethernet Media Independent Interface and analog signaling over twisted-pair or fiber media. In the network hierarchy, the KSZ8001SI sits between a network controller or embedded processor and an Ethernet transformer or optical interface. Its MII support permits a parallel host connection, RMII reduces the host-side pin and signal burden, and SMII provides a serial alternative. The verified device information identifies a 1.8 V CMOS design, 250 mW power consumption, operation over standard cables longer than 130 m, and support for MII, RMII, and SMII. LinkMD determines cable length and diagnoses faulty cables up to 200 m with stated accuracy of ±2 m. These capabilities make the device suitable for embedded Ethernet equipment, industrial controllers, network adapters, and test equipment. The KSZ8001SI supports copper and fiber link modes, including 10BASE-T, 100BASE-TX, and 100BASE-FX. Its 48-BSSOP package is intended for surface-mount PCB assembly, while the supplied search results identify tube packaging for one ordering configuration. The MII, RMII, and SMII interfaces give system designers flexibility in host bus selection and board partitioning. For copper links, the PHY requires appropriate external magnetics, termination, line-side filtering, and a compliant Ethernet transformer or coupling network. For 100BASE-FX, the external fiber interface must be designed for the selected optical device and link budget. The selected interface mode, clocking method, and host voltage must follow the manufacturer datasheet. A critical design consideration is that advertised protocol support does not eliminate the need for PCB-level Ethernet compliance testing. Differential routing, grounding, magnetics placement, isolation boundaries, and power filtering can determine whether a nominal PHY implementation achieves reliable 10BASE-T and 100BASE-TX operation. This page consolidates verified product facts, sourcing data, interface options, and engineering guidance for design evaluation.
KSZ8001SL - 10/100 Ethernet PHY, 48-SSOP | Microchip Technology
Microchip Technology KSZ8001SL is a single-chip 10BASE-T, 100BASE-TX, and 100BASE-FX physical-layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-lead SSOP package. The verified data identifies 1.8 V and 3.3 V supply operation, a 250 mW power-consumption figure, and support for cables longer than 130 m. It also includes LinkMD cable diagnostics. An Ethernet physical-layer transceiver, or Ethernet PHY, is the interface between a digital host controller and physical copper or fiber media. It belongs to the hierarchy of Ethernet interface ICs, network interface controllers, communication semiconductors, and integrated circuits. By translating host-interface signals into physical-layer signaling, a PHY allows an embedded controller, communications processor, or FPGA to connect to 10 Mb/s or 100 Mb/s Ethernet networks. The KSZ8001SL supports MII, Reduced Media Independent Interface, and Serial Media Independent Interface host connections. This selection of interfaces gives designers options for parallel, reduced-pin, and serial host integration. Its 1.8 V CMOS-oriented implementation and stated 250 mW power consumption are relevant to compact embedded networking equipment where supply efficiency and interface count influence system architecture. The physical-layer capability covers 10BASE-T copper Ethernet, 100BASE-TX twisted-pair Ethernet, and 100BASE-FX fiber Ethernet. Verified manufacturer information identifies LinkMD cable diagnostics, a feature intended to help system software characterize the physical cable connection. Operation over standard cables of more than 130 m is also identified for the device family. Typical uses include industrial Ethernet controllers, embedded network appliances, communications modules, industrial automation equipment, and custom Ethernet designs based on an FPGA or application-specific processor. The MII, RMII, and SMII choices allow the same PHY family to support different host-controller architectures, provided the selected interface is wired and clocked correctly. Designers should preserve the package footprint, supply sequencing, interface timing, and media-side termination requirements of the selected device configuration. Because the verified material does not provide complete pin-level details, current limits, link-time specifications, temperature limits, or validated replacement data, those values should be confirmed in the manufacturer datasheet before schematic release or production qualification. This page consolidates the verified distributor and manufacturer information for KSZ8001SL, distinguishes documented drop-in candidates from unsupported assumptions, and provides application and selection guidance that supplements the basic catalog description without inventing missing electrical or lifecycle details.
KSZ8001SL-TR - 10/100 Ethernet PHY, 48-SSOP | Microchip Technology (Tape & Reel)
Microchip Technology KSZ8001SL-TR is a single-chip 10BASE-T, 100BASE-TX, and 100BASE-FX physical-layer transceiver with MII, RMII, and SMII host interfaces, supplied in a 48-lead SSOP package. The verified data identifies 1.8 V and 3.3 V supply operation, a 250 mW power-consumption figure, and support for cables longer than 130 m. It also includes LinkMD cable diagnostics. An Ethernet physical-layer transceiver, or Ethernet PHY, is the interface between a digital host controller and physical copper or fiber media. It belongs to the hierarchy of Ethernet interface ICs, network interface controllers, communication semiconductors, and integrated circuits. By translating host-interface signals into physical-layer signaling, a PHY allows an embedded controller, communications processor, or FPGA to connect to 10 Mb/s or 100 Mb/s Ethernet networks. The KSZ8001SL-TR supports MII, Reduced Media Independent Interface, and Serial Media Independent Interface host connections. This selection of interfaces gives designers options for parallel, reduced-pin, and serial host integration. Its 1.8 V CMOS-oriented implementation and stated 250 mW power consumption are relevant to compact embedded networking equipment where supply efficiency and interface count influence system architecture. The physical-layer capability covers 10BASE-T copper Ethernet, 100BASE-TX twisted-pair Ethernet, and 100BASE-FX fiber Ethernet. Verified manufacturer information identifies LinkMD cable diagnostics, a feature intended to help system software characterize the physical cable connection. Operation over standard cables of more than 130 m is also identified for the device family. Typical uses include industrial Ethernet controllers, embedded network appliances, communications modules, industrial automation equipment, and custom Ethernet designs based on an FPGA or application-specific processor. The MII, RMII, and SMII choices allow the same PHY family to support different host-controller architectures, provided the selected interface is wired and clocked correctly. Designers should preserve the package footprint, supply sequencing, interface timing, and media-side termination requirements of the selected device configuration. Because the verified material does not provide complete pin-level details, current limits, link-time specifications, temperature limits, or validated replacement data, those values should be confirmed in the manufacturer datasheet before schematic release or production qualification. This page consolidates the verified distributor and manufacturer information for KSZ8001SL-TR, distinguishes documented drop-in candidates from unsupported assumptions, and provides application and selection guidance that supplements the basic catalog description without inventing missing electrical or lifecycle details.
KSZ8021RNL - 10/100 Ethernet PHY RMII | Microchip
The Microchip Technology KSZ8021RNL is a single-supply 10Base-T/100Base-TX Ethernet physical-layer transceiver with Reduced Media Independent Interface support, a 50 MHz RMII reference-clock input, and a 24-QFN exposed-pad package measuring 4 mm by 4 mm. It provides the physical-layer functions required to connect an RMII-compatible Ethernet MAC or processor to standard Category 5 unshielded twisted-pair cabling. An Ethernet PHY is a semiconductor that converts logical data transmitted by a Media Access Controller into electrical signals suitable for copper cabling, while recovering incoming signals and forwarding recovered data to the MAC. In the product hierarchy, the KSZ8021RNL is an Ethernet transceiver, an interface IC, a physical-layer device, and a network-connectivity semiconductor. Its RMII interface reduces the number of parallel data connections required between the PHY and the host processor compared with older parallel Ethernet interfaces. The manufacturer datasheet identifies the KSZ8021RNL as the variant that accepts a 50 MHz RMII reference clock. It also describes support for status and control registers and an interrupt pin that eliminates the need for the processor to poll PHY output continuously. The 24-QFN exposed-pad construction supports compact Ethernet designs by providing a solderable thermal and electrical connection beneath the package while allowing the board to remove heat through its copper area. The KSZ8021RNL supports both 10Base-T and 100Base-TX operation, allowing a system to use a common physical-layer device for 10 Mbps legacy Ethernet and 100 Mbps Fast Ethernet links. Compatibility with standard CAT-5 unshielded twisted pair makes it applicable to embedded controllers, industrial equipment, access equipment, printers, set-top boxes, and embedded Ethernet systems that use an RMII-capable host processor. Typical implementations place the PHY close to the RJ45 connector and route the differential twisted-pair pairs with controlled geometry. The MAC supplies transmit data and timing signals over RMII, while the PHY translates those signals for the cable. Received data, carrier status, collision information, and interrupt indications are returned to the host through the interface. System firmware then handles link negotiation, autonegotiation, and network-stack configuration. A critical layout consideration is maintaining a continuous ground reference beneath the differential pairs and avoiding splits in the ground plane. The exposed pad should be connected to ground and thermal copper using the manufacturer’s land-pattern guidance. Input and interface traces also require careful return-path planning because the RMII clock and data signals operate at a relatively high digital rate relative to the 10/100 Ethernet data payload. This page combines the manufacturer datasheet, verified distributor identification, package information, and the manufacturer’s hardware-migration guidance. It also distinguishes a genuine same-family drop-in option from newer PHY families whose pin assignments differ, helping engineers avoid replacements that require board changes or interface redesign.
KSZ8031RNL - 10/100 Ethernet PHY | Microchip Technology
The Microchip Technology KSZ8031RNL is a single-supply 10Base-T/100Base-TX Ethernet physical layer transceiver with a 3.3 V supply, full-duplex operation, and an RMII interface to an Ethernet MAC. It is packaged in a surface-mount 24-QFN (4 x 4 mm) package for compact networking equipment. The device handles transmission and reception over standard CAT-5 unshielded twisted-pair cable. An Ethernet physical layer transceiver is the circuit that converts digital frame data from an Ethernet media access controller into signals suitable for twisted-pair cabling, then converts received cable signals back into digital data. This PHY belongs to the hierarchy Ethernet transceiver > physical layer device > network interface IC > semiconductor. RMII provides a standardized parallel connection between the PHY and a compatible Ethernet processor or switch. The KSZ8031RNL supports both 10Base-T and 100Base-TX operation, allowing one physical-layer design to serve legacy 10 Mb/s and Fast Ethernet 100 Mb/s links. Its full-duplex RMII interface supports simultaneous transmit and receive activity, while single-supply operation simplifies system power design. The 24-QFN package also supports space-constrained embedded networking designs. Compared with the related KSZ8021RNL, the KSZ8031RNL uses the RMII reference-clock arrangement suited to systems requiring a 25 MHz reference. The RMII interface exposes the PHY connections required for data, control, carrier sense, and clock signaling between the transceiver and Ethernet MAC. The manufacturer documentation also identifies the device as a direct-interface physical layer rather than a complete Ethernet controller. Typical uses include industrial Ethernet equipment, embedded control systems, IP cameras, network switches, serial-to-Ethernet products, and compact data-acquisition devices. The device is particularly appropriate when a host processor already includes an RMII-compatible Ethernet MAC and the PCB area is limited. Design the PCB with the 24-QFN footprint, power and decoupling capacitors, a 50 MHz differential clock arrangement, and an RMII interface routed according to the manufacturer datasheet. Confirm PHY address, strap configuration, magnetics, termination, and cable-side layout before releasing the design. This product page combines the manufacturer electrical description, package information, application guidance, replacement cross-checks, and PCB-focused design considerations to support faster component selection and implementation.
KSZ8041FTL - 10/100 Ethernet PHY with 100BASE-FX | Microchip
The Microchip Technology KSZ8041FTL is a single-supply 10Base-T, 100Base-TX, and 100Base-FX Ethernet physical-layer transceiver with MII, RMII, and SMII interfaces, supplied in a 48-pin 7 x 7 mm TQFP package. Its 3.135 V to 3.465 V supply range, one transmitter and one receiver, and automatic MDI/MDI-X handling support copper and fiber Ethernet connectivity. An Ethernet physical-layer transceiver, commonly called an Ethernet PHY, converts digital data from a network controller into electrical or optical-signaling-compatible signals for the physical medium. The KSZ8041 belongs to the Ethernet interface IC hierarchy, combining a 10/100 Ethernet MAC interface with mixed-signal circuitry for 10Base-T, 100Base-TX, and 100Base-FX physical channels. The KSZ8041FTL adds 100Base-FX support to the feature set of the KSZ8041TL. This makes the FTL suitable for fiber links, media converters, and equipment that needs one Ethernet PHY to address copper and fiber interfaces. Automatic crossover handling through HP Auto MDI/MDI-X removes the need to distinguish straight-through and crossover cables in conventional copper installations. Its mixed-signal design is intended to extend signaling distance while reducing power consumption. The device supports full MII, reduced MII, and serial MII connectivity, allowing integration with network controllers operating at different interface rates and pin requirements. The 48-pin lead-free TQFP package provides a conventional surface-mount footprint for industrial and embedded Ethernet equipment. Typical uses include 10/100 industrial Ethernet controllers, fiber-to-copper media converters, embedded gateways, network switches, test equipment, and communication equipment requiring a single PHY with both copper and fiber support. Evaluation is supported by the Microchip KSZ8041FTL-EVAL platform, while the KSZ8041TL-FTL evaluation board covers the related TL and FTL devices. A critical design consideration is validating the selected media mode, PHY address straps, and interface configuration at power-up. The manufacturer hardware design checklist specifically identifies reset-time strap behavior and warns that receive inputs can affect strap latching, so external hardware and software sequencing must follow the manufacturer guidance. This page combines manufacturer-supported interface and package information with distributor availability references, practical application guidance, and engineering-focused comparison data. It also distinguishes exact verified facts from parameters that require confirmation from the current manufacturer datasheet before a new PCB or production release is approved.
KSZ8041FTL-TR - 10/100 Ethernet PHY with 100BASE-FX | Microchip (Tape & Reel)
The Microchip Technology KSZ8041FTL-TR is a single-supply 10Base-T, 100Base-TX, and 100Base-FX Ethernet physical-layer transceiver with MII, RMII, and SMII interfaces, supplied in a 48-pin 7 x 7 mm TQFP package. Its 3.135 V to 3.465 V supply range, one transmitter and one receiver, and automatic MDI/MDI-X handling support copper and fiber Ethernet connectivity. An Ethernet physical-layer transceiver, commonly called an Ethernet PHY, converts digital data from a network controller into electrical or optical-signaling-compatible signals for the physical medium. The KSZ8041 belongs to the Ethernet interface IC hierarchy, combining a 10/100 Ethernet MAC interface with mixed-signal circuitry for 10Base-T, 100Base-TX, and 100Base-FX physical channels. The KSZ8041FTL-TR adds 100Base-FX support to the feature set of the KSZ8041TL. This makes the FTL suitable for fiber links, media converters, and equipment that needs one Ethernet PHY to address copper and fiber interfaces. Automatic crossover handling through HP Auto MDI/MDI-X removes the need to distinguish straight-through and crossover cables in conventional copper installations. Its mixed-signal design is intended to extend signaling distance while reducing power consumption. The device supports full MII, reduced MII, and serial MII connectivity, allowing integration with network controllers operating at different interface rates and pin requirements. The 48-pin lead-free TQFP package provides a conventional surface-mount footprint for industrial and embedded Ethernet equipment. Typical uses include 10/100 industrial Ethernet controllers, fiber-to-copper media converters, embedded gateways, network switches, test equipment, and communication equipment requiring a single PHY with both copper and fiber support. Evaluation is supported by the Microchip KSZ8041FTL-TR-EVAL platform, while the KSZ8041TL-FTL evaluation board covers the related TL and FTL devices. A critical design consideration is validating the selected media mode, PHY address straps, and interface configuration at power-up. The manufacturer hardware design checklist specifically identifies reset-time strap behavior and warns that receive inputs can affect strap latching, so external hardware and software sequencing must follow the manufacturer guidance. This page combines manufacturer-supported interface and package information with distributor availability references, practical application guidance, and engineering-focused comparison data. It also distinguishes exact verified facts from parameters that require confirmation from the current manufacturer datasheet before a new PCB or production release is approved.
KSZ8041NLI-TR - 10/100 Ethernet PHY | Microchip
Microchip Technology KSZ8041NLI-TR is a single-supply 10Base-T/100Base-TX Ethernet physical-layer transceiver with MII and RMII interfaces, operating from a single 3.3 V supply and packaged in a 32-QFN 5x5 mm package. It supports one Ethernet channel at 10 Mbps or 100 Mbps and includes the mixed-signal circuitry required to connect a network medium interface to a digital Ethernet controller. An Ethernet PHY, or physical-layer transceiver, converts digital frame data into electrical signaling for a 10/100 Ethernet link and converts received link signals back into data for the host controller. The KSZ8041 sits between an Ethernet MAC or microcontroller with MII/RMII support and the transformer-coupled network interface, providing the physical signaling layer required by IEEE 802.3 Ethernet designs. Key verified features include 10/100Base-TX operation, full MII and RMII interface support, single-supply operation, and a 32-QFN package measuring 5x5 mm. The manufacturer describes a mixed-signal design intended to extend signaling distance while reducing power consumption. The part is identified by the -TR ordering suffix and is listed in tape-and-reel commercial distribution channels. The interface architecture makes the KSZ8041 suitable for embedded Ethernet designs, including industrial controllers, embedded processors, set-top boxes, access equipment, and other systems that require a 10/100 Ethernet physical layer. MII support suits designs requiring separate transmit and receive data paths, while RMII can reduce the number of digital interface signals when supported by the host controller. When placing the device, follow the manufacturer package and land-pattern requirements, provide the specified decoupling and Ethernet magnetics interface components, and route high-speed or high-current network-side connections according to the applicable reference design. The exact pin names, pin functions, electrical limits, and recommended external-component values require confirmation from the official manufacturer datasheet before layout release. This page consolidates verified manufacturer and distributor information for KSZ8041NLI-TR and distinguishes confirmed product facts from parameters that were not included in the supplied search data. It is intended to support component identification, sourcing, and preliminary engineering review rather than replace the complete Microchip datasheet.