KSZ8001LA2 - 10/100 Ethernet PHY | Microchip | 48-LQFP
MPN: KSZ8001LA2 ✓ ActiveKSZ8001LA2 Overview
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.
Drop-in alternatives for KSZ8001LA2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with KSZ8001LA2 (same form factor and footprint) — differing in Package, Auto-Negotiation, Cable Diagnostics, Host Interface, Operating Temperature.
KSZ8001L
✅ Drop-InContact for price
View Datasheet →KSZ8001LI
✅ Drop-InContact for price
View Datasheet →KSZ8001LA2 Specifications
| Product Type | Ethernet physical layer transceiver |
| Ethernet Speed Support | 10 Mb/s and 100 Mb/s |
| Copper Media Support | 10BASE-T and 100BASE-TX |
| Fiber Media Support | 100BASE-FX |
| Host Interface | MII, RMII, and SMII |
| Supply Voltage Options | 1.8 V or 3.3 V |
| Package | 48-LQFP (7 x 7 mm) |
| Mounting Type | Surface mount |
| Packaging | Tape and reel |
| Cable Diagnostics | LinkMD |
| Power Class | Low-power PHY |
| Transceiver Configuration | Full transceiver |
| Maximum Link Rate | 100 Mb/s |
KSZ8001LA2 48-lqfp (7 x 7 mm) Pin Configuration Guide
Pin configuration for KSZ8001LA2 (48-lqfp (7 x 7 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for KSZ8001LA2.
Refer to the datasheet for full pin configuration.
Typical Applications
KSZ8001LA2 is suitable for 6 applications: Embedded 10/100 Ethernet Controller Interface, Industrial Ethernet Gateway, 100BASE-FX Fiber Network Interface, Network Communication Module, Networked Monitoring and Control Unit, Network Adapter and Protocol Converter.
Embedded 10/100 Ethernet Controller Interface
The KSZ8001LA2 fits embedded systems that require an Ethernet medium interface close to a microcontroller, application processor, or communications controller. Its 10BASE-T and 100BASE-TX support covers 10 Mb/s legacy and 100 Mb/s Fast Ethernet networks, while MII, RMII, and SMII give the host designer multiple interface choices. The low-power 48-LQFP implementation can simplify products that otherwise require several external interface components. RMII may reduce host-signal count, whereas MII can suit controllers designed around a wider parallel bus. Exact clock, reset, register, and timing requirements remain [DATA_NEEDED: host-interface timing and register details] and should be taken from the complete manufacturer documentation.
Recommended
Industrial Ethernet Gateway
The KSZ8001LA2 is applicable to industrial Ethernet gateways that bridge a local controller or embedded system to a 10/100 Mb/s network. It supports copper connectivity through 10BASE-T and 100BASE-TX and includes LinkMD cable diagnostics, which can help commissioned equipment identify cabling problems. The 1.8 V or 3.3 V supply options provide flexibility when working with different system rails, while the 48-LQFP package supports dense surface-mount designs. The PHY should be paired with the magnetics and isolation components specified for the selected copper interface. Its suitability for a particular industrial temperature range or functional-safety program cannot be confirmed because [DATA_NEEDED: operating temperature and qualification details] are absent.
Recommended
100BASE-FX Fiber Network Interface
The KSZ8001LA2 supports 100BASE-FX in addition to copper Ethernet, making it useful in equipment designed to use a 100 Mb/s fiber uplink. A fiber-capable PHY allows a network interface design to include a 100 Mb/s optical path without changing to a separate Ethernet media family. The MII, RMII, and SMII host interfaces allow the optical-facing PHY to connect to controllers using different parallel interfaces. Designers must select compatible fiber components, maintain the required media signal path, and follow the manufacturer's layout guidance. Detailed optical-side electrical limits, fiber compatibility, and isolation requirements are [DATA_NEEDED: 100BASE-FX interface specifications] and should not be inferred solely from the 100BASE-FX media label.
Recommended
Network Communication Module
The KSZ8001LA2 can provide the physical network layer in a communication module that connects an embedded host to 10BASE-T or 100BASE-TX equipment. Its three host-interface options allow integration with controllers designed for MII, RMII, or SMII, reducing the need to standardize every host processor on one physical interface. LinkMD cable diagnostics add a service function for detecting wiring faults, while the low-power 48-LQFP package is appropriate for compact modules. The final design still requires validated magnetics, isolation, impedance-controlled routing, and software support for the selected host interface. Exact recovery timing, register defaults, and media-magnetics requirements are [DATA_NEEDED: detailed interface and timing specifications].
Recommended
Networked Monitoring and Control Unit
The KSZ8001LA2 is suitable for a monitoring or control unit that must report measurements and accept commands over a 10/100 Mb/s Ethernet link. The device supports both 10BASE-T and 100BASE-TX, providing compatibility with widely deployed copper infrastructure, while LinkMD can assist with cable diagnostics during installation or operation. Its low-power PHY description and compact 48-LQFP package are useful in instrumentation and compact control equipment. Firmware should expose PHY status and diagnostic results through the selected host interface. Before production release, engineers must confirm reset behavior, LED handling, clock tolerance, and temperature limits from [DATA_NEEDED: detailed host-interface and environmental specifications].
Recommended
Network Adapter and Protocol Converter
The KSZ8001LA2 can serve as the Ethernet physical layer in a compact adapter or protocol-converter product. Connecting a controller through MII, RMII, or SMII allows the converter to support multiple host architectures, while 10BASE-T, 100BASE-TX, and 100BASE-FX provide copper and fiber-facing choices. This combination is useful when one embedded platform must bridge an internal interface to external Ethernet equipment. The adapter design should follow the manufacturer's recommended Ethernet component set and preserve controlled-impedance differential routing. Detailed requirements for media magnetics, fiber components, isolation, and media-side power are [DATA_NEEDED: media-interface component requirements], so no unverified component values are assumed here.
Recommended
Recommended Products Summary
Engineering reference data for KSZ8001LA2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ8001L | KSZ8001LI |
|---|---|---|---|
| Package | 48-LQFP (7 x 7 mm) | 48-LQFP (7 x 7 mm) | 48-LQFP (7 x 7 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Ethernet Media Support | 10BASE-T, 100BASE-TX, 100BASE-FX | 10BASE-T, 100BASE-TX, 100BASE-FX | 10BASE-T, 100BASE-TX, 100BASE-FX |
| Maximum Link Rate | 100 Mb/s | 100 Mb/s | 100 Mb/s |
| Host Interfaces | MII, RMII, SMII | MII, RMII, SMII | MII, RMII, SMII |
| Cable Diagnostics | LinkMD | LinkMD | LinkMD |
Key Differentiators
- Three host-interface choices in one PHY (vs KSZ8001L)
- Copper and fiber media capability (vs KSZ8001LI)
- Integrated cable diagnostics (vs KSZ8001L)
Design Notes
Route the Ethernet differential pairs as controlled-impedance traces and follow the manufacturer's reference layout for PHY, magnetics, and connector placement. Keep the MII, RMII, or SMII host interface traces short and route them away from noisy switching nodes. The verified data confirms the 48-LQFP footprint and supported interfaces but does not provide trace-impedance, length, or component-placement dimensions, so those values must be obtained from the manufacturer layout guidance before PCB release.
Design the power tree for the PHY's documented 1.8 V and 3.3 V supply options, but verify which rail powers each functional block from the complete datasheet. Place bypass capacitors at the supply pins using the manufacturer-recommended capacitance, voltage rating, and placement. Startup sequencing, current limits, and power-supply noise sensitivity are [DATA_NEEDED: detailed power requirements]. Validate the assembled board with an Ethernet link and measure supply ripple at the PHY rather than relying only on a source-rail measurement.
Do not select a substitute from the family name alone. KSZ8001L and KSZ8001LI are documented comparison candidates, but temperature grade, qualification, clock requirements, and package details must be checked before a substitution is approved. Also verify whether the selected media is copper or fiber because 100BASE-FX requires different supporting components and layout considerations. The KSZ8001LA2 supports MII, RMII, and SMII, but the host controller must support the interface actually configured in the design.
Compliance Information
The supplied comparison-result snippets state that RoHS and REACH are compared for KSZ8001 variants, but they do not expose the resulting status values. No verified AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was provided.
