KSZ8721BA4 - 10/100 Ethernet Transceiver | Microchip Technology
Teilenummer: KSZ8721BA4 ✗ AbgekündigtKSZ8721BA4 Übersicht
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.
Drop-in-Alternativen für KSZ8721BA4 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit KSZ8721BA4 (gleiche Bauform und Footprint) – abweichend in Host Interface, Package.
KSZ8721B-TR
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →KSZ8721B
✅ Drop-In ⚠️ Spezifikationen ungeprüftPreis auf Anfrage
Datenblatt ansehen →KSZ8721BA4 Technische Daten
| Product Type | Single-port Ethernet transceiver |
| Ethernet Speed | 10/100 Mbps |
| Duplex Mode | Full duplex |
| Interface Support | MII and RMII |
| MAC Integration | Integrated Media Access Controller |
| PHY Integration | Integrated Physical Layer |
| Port Count | 1 |
| Gehäuse | 48-SSOP |
| Package Width | 7.50 mm |
| Montageart | Surface mount |
| Datenrate | 10 Mbps to 100 Mbps |
| Host Interface | MII or RMII |
| Pin-Anzahl | 48 pins |
KSZ8721BA4 7.50 mm Pinbelegungsleitfaden
Pinbelegung für KSZ8721BA4 (7.50 mm-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für KSZ8721BA4.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
KSZ8721BA4 ist geeignet für 6 Anwendungs: Industrial Ethernet Control Systems, Embedded Routers and Gateways, Factory Automation Equipment, Building Automation Controllers, Compact Communications Modules, Network Test and Measurement Equipment.
Industrial Ethernet Control Systems
The KSZ8721BA4 fits industrial controllers that need a compact 10/100 Mbps Ethernet endpoint with either MII or RMII host connectivity. Its integrated MAC and PHY reduce the external interface component count, while the 48-SSOP package supports automated surface-mount assembly. MII is appropriate when the host controller already supports the wider parallel interface; RMII is useful when fewer host signals and simpler routing are priorities. Before schematic release, engineers should verify the exact interface pins, clock source, reset requirements and reference magnetics against the manufacturer datasheet, because those details are not included in the supplied distributor snippets.
Empfohlen
Embedded Routers and Gateways
The KSZ8721BA4 provides the 10/100 Mbps physical and MAC-side interface required by embedded routers, gateways and protocol-conversion equipment. A system using RMII can connect the transceiver to a capable host controller with a reduced parallel interface, helping conserve pins and board area, while MII offers broader control signaling for designs already structured around that interface. The device's integrated MAC and PHY functions can simplify board partitioning, but the final design still requires verified Ethernet magnetics, suitable clocking and compliant power distribution. Those implementation details must be taken from the current manufacturer documentation rather than inferred from generic Ethernet circuits.
Empfohlen
Factory Automation Equipment
The KSZ8721BA4 is appropriate for factory automation controllers, sensor gateways and machine-monitoring modules that must exchange data over 10/100 Mbps Ethernet. Its single-port full-duplex configuration supports a dedicated wired network link, while selectable MII and RMII operation allows the transceiver to align with different embedded host architectures. The surface-mount 48-SSOP package facilitates automated production and compact board layouts. For industrial deployment, check the ordered temperature grade, isolation strategy, surge requirements and EMC implementation; these qualification and protection details are not present in the supplied verified data and must be confirmed before release.
Empfohlen
Building Automation Controllers
The KSZ8721BA4 can provide the wired Ethernet link used by building-automation controllers, room controllers and energy-management gateways operating at 10/100 Mbps. RMII can reduce host-side pin requirements, making the device suitable for compact multi-function controller boards, while MII provides an alternative for host processors that already implement that bus. The integrated MAC and PHY arrangement helps isolate the Ethernet physical connection from the application processor. Final implementation still depends on verified clock topology, isolation or magnetics, reset behavior and environmental qualification. The supplied listing does not establish industrial-temperature or regulatory status, so those points require separate confirmation.
Empfohlen
Compact Communications Modules
The KSZ8721BA4 is suited to compact communications modules that need a standardized 10/100 Mbps Ethernet interface without implementing separate MAC and PHY components. A reduced-pin RMII connection can help preserve board area in small modules, while the alternative MII interface supports designs that require its additional parallel signals. The 48-SSOP package is compatible with surface-mount assembly, although its 7.50 mm width must be accounted for in dense module layouts. Before committing to a module design, verify the exact power requirements, clock source, termination network, magnetics and package drawing against the current Microchip datasheet and supported reference design.
Empfohlen
Network Test and Measurement Equipment
The KSZ8721BA4 can supply the 10/100 Mbps Ethernet connection used by portable test instruments, data loggers and diagnostic controllers. Full-duplex operation supports simultaneous bidirectional traffic, and the availability of MII and RMII lets the equipment designer select the interface most compatible with the acquisition or host processor. In an RMII implementation, the reduced signal count can simplify routing around dense analog, display or memory sections of the board. The surface-mount 48-SSOP package supports volume assembly, but production designs still require manufacturer-verified isolation, clocking, magnetics and decoupling arrangements. The supplied search data does not specify operating temperature or lifecycle status.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für KSZ8721BA4 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | KSZ8721B-TR | KSZ8721B |
|---|---|---|---|
| Package | 48-SSOP | 48-SSOP | 48-SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Ethernet Speed | 10/100 Mbps | 10/100 Mbps | 10/100 Mbps |
| Port Count | 1 | 1 | 1 |
| Host Interface | MII and RMII | MII and RMII | MII and RMII |
| Mounting Type | Surface mount | Surface mount | Surface mount |
Wichtigste Unterscheidungsmerkmale
- Verified support for both parallel host-interface styles (vs. KSZ8721B)
- Integrated MAC and PHY in a single Ethernet transceiver (vs. KSZ8721B-TR)
- Single-port full-duplex 10/100 Mbps configuration (vs. KSZ8721B)
Designhinweise
Place the KSZ8721BA4 in accordance with the current manufacturer reference layout and preserve short, tightly controlled clock and interface traces. The verified sources confirm a 48-SSOP package and MII/RMII support, but they do not provide the recommended land pattern, trace impedances or copper dimensions. Use the official package drawing and layout guidance rather than deriving them from a generic SSOP footprint.
Do not finalize the power rail until the supply-voltage range, current consumption and sequencing requirements have been checked in the manufacturer datasheet. Follow the documented input, ground and decoupling connections exactly, including the required return-path connections around the interface. The supplied data does not include a reference schematic or capacitor values, so generic Ethernet-transceiver values should not be substituted for manufacturer requirements.
Choose MII or RMII based on the host controller, clocking method and routing budget rather than treating the interfaces as interchangeable at the board level. RMII can reduce host-side pin count, but it remains sensitive to correct clock source, timing and controlled routing. Verify setup and hold requirements, clock tolerance and any recommended series termination from the current Microchip documentation before signal-integrity signoff.
A same-package replacement is not automatically a functional substitute. Before exchanging KSZ8721BA4 for KSZ8721B-TR or KSZ8721B, compare all 48 pins, interface configuration straps, supply levels, clock sources, reset behavior, MAC/PHY functions and Ethernet magnetics reference circuit. The supplied cross-reference results establish family relevance but do not provide a complete pin-by-pin equivalence table, so schematic and layout review remain mandatory.
Compliance-Informationen
The supplied verified search results do not explicitly extract RoHS, REACH, lead-free, halogen-free or conflict-minerals status for KSZ8721BA4. A related comparison search mentions RoHS and REACH fields, but no definitive values were exposed. AEC-Q100 is marked not_applicable because this is an Ethernet interface IC rather than an automotive-qualified power device.