LAN8710A-EZC-TR is a highly integrated 10/100M Ethernet Physical Layer (PHY) transceiver from Microchip (acquired via SMSC), in a compact QFN-32 package (3x3mm) with built-in 25MHz crystal oscillator, 1.8V/2.5V regulator and network transformer interface circuitry - minimal external components required.

The chip's standout feature is HP Auto-MDI/X - the industry's first automatic polarity detection and correction, eliminating TX+/TX- and RX+/RX- cable confusion and greatly simplifying field wiring. The chip is fully IEEE 802.3/802.3u compliant with Auto-Negotiation support.

LAN8710A supports MII/RMII/PMI MAC interfaces configurable via MODE pins. Compliant with Energy Efficient Ethernet (EEE) standard (IEEE 802.3az), it automatically enters low-power idle mode, consuming less than 315mW - ideal for power-sensitive IoT and green energy devices.

LAN8710A-EZC-TR uses QFN-32 package (Quad Flat No-Lead, 3x3mm) with exposed thermal pad on the bottom. QFN package has no leads extending outward, minimizing PCB footprint - ideal for space-constrained embedded designs. The chip integrates a 25MHz crystal oscillator, 1.8V/2.5V regulator and network transformer interface circuitry with minimal external components.

PCB layout recommendation: bottom pad must be well-grounded with thermal via arrays transferring heat to PCB ground plane. Differential pairs (TX+/TX- and RX+/RX-) should be length-matched and tightly coupled, with 100Ω differential impedance control; surrounding ground fill reduces crosstalk.

• TX+/TX- (Pins 21/22): Transmit Differential Pair：Connect to transmit side of network transformer. Differential output driving 100Ω differential impedance trace. Series resistors (22~33Ω) near the chip recommended to reduce EMI radiation.
• RX+/RX- (Pins 25/26): Receive Differential Pair：Connect to receive side of network transformer. On-chip termination - no external resistors needed. Trace requirements identical: 100Ω differential impedance control.
• REFCLK (Pin 4): Reference Clock：50MHz bidirectional reference clock. Acts as output when MODE[2:0]=001 (chip provides clock); as input otherwise (external MAC provides clock).
• RXD[0:3] (Pins 11-14): Receive Data：MII/RMII receive data bus; specific mode determined by configuration pins. Connect to corresponding data pins on MAC controller.
• TXD[0:3] (Pins 6-9): Transmit Data：MII/RMII transmit data bus. Specific pin functions determined by MODE[2:0] configuration pins.
• CRS/COL (Pins 17/18): Carrier Sense / Collision：MII mode carrier sense and collision detection signals. Not used in RMII mode (reassigned for other functions).

The following alternative parts are listed for reference. Before selecting an alternative, verify communication interface, supply voltage, package compatibility, and software API differences.

Package Comparison

Microchip Technology Inc. (NASDAQ: MCHP), headquartered in Chandler, Arizona, expanded its product line through strategic acquisitions. After acquiring SMSC (Standard Microsystems Corporation) in 2012, Microchip incorporated SMSC's Ethernet product family (including LAN9500/LAN8700 series) and took a significant position in the industrial and consumer Ethernet PHY market. The LAN8710A series is a representative product of this integration.

Microchip's Ethernet PHY products cover the full range from 10M to Gigabit, with rich driver support and application reference designs widely used in industrial automation, consumer electronics and IoT.