Microchip Technology VSC8662XIC-03

Overview

VSC8662XIC-03 from Microsemi (now Microchip) is a dual-port Ethernet physical layer transceiver supporting 10/100/1000BASE-T over twisted pair and 100BASE-FX/1000BASE-X over fiber or backplane SerDes. It integrates recovered clock outputs, IEEE 802.3af PoE support, ActiPHY power management, and SGMII MAC interface. Designed for managed switches, industrial Ethernet gateways, and time-sensitive networking edge nodes.

For engineers reviewing the VSC8662XIC-03 datasheet, VSC8662XIC-03 pinout, VSC8662XIC-03 application, or VSC8662XIC-03 equivalent, key selection criteria include dual-port SerDes media flexibility, transformerless 1000BASE-T operation, recovered clock jitter performance (<1.5 ps RMS), IEEE 802.3af Class 0–3 PoE compatibility, and integrated VeriPHY cable diagnostics.

Technical Context

The VSC8662XIC-03 implements two independent PHY channels with configurable SerDes MAC interfaces (SGMII or 1000BASE-X), each supporting auto-negotiation, parallel detection, and automatic MDI/MDI-X crossover. Its SerDes media interface operates in PCS auto-negotiation or pass-through mode, enabling direct connection to FPGA or switch fabric without external retiming.

It features dual recovered clock outputs (125 MHz and 25 MHz) derived from line-recovered timing, with programmable squelch and selection logic. The device supports IEEE 1149.1/1149.6 JTAG boundary scan, two-wire serial multiplexer for SFP module control, and GPIO-configurable fast link failure indication.

Key Specifications

Pinout & Package

The VSC8662XIC-03 is housed in a 128-pin TQFP package (14 mm × 14 mm, 0.4 mm pitch) with exposed thermal pad. Pin assignments are defined per VMDS-10312 Rev 4.3 Section 6, including dedicated SerDes TX/RX pairs, SGMII differential lanes, recovered clock outputs (RCLK1, RCLK2), and configurable GPIOs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port Ethernet PHY applications.

Compared with the Marvell 88E1512 and Microchip LAN8814, the VSC8662XIC-03 uniquely combines dual-port copper/fiber SerDes, on-die recovered clocks, and PoE sourcing in one package-enabling single-chip aggregation nodes where timing integrity, media flexibility, and power delivery are co-located requirements.

Availability

VSC8662XIC-03 is available at Aetrix Electronics and suitable for industrial Ethernet switches, TSN edge gateways, managed PoE extenders, and embedded vision systems requiring stable component supply across extended product lifecycles.

Supply support for VSC8662XIC-03 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi, now part of Microchip Technology Inc., specializes in high-reliability analog, mixed-signal, and timing solutions for aerospace, defense, communications, and industrial markets.

The VSC8662XIC-03 belongs to Microsemi's Ethernet PHY product line, engineered for deterministic, low-latency, multi-media Ethernet connectivity in harsh environments where timing accuracy, power efficiency, and diagnostic capability are critical.

FAQ

What Ethernet standards does the VSC8662XIC-03 support?

The VSC8662XIC-03 supports 10BASE-T, 100BASE-TX, 1000BASE-T over twisted pair; 100BASE-FX and 1000BASE-X over fiber or backplane SerDes; and SGMII MAC interface at 2.5 Gbps. It complies with IEEE 802.3, 802.3u, 802.3ab, 802.3z, and 802.3af standards. All modes are implemented in silicon-no firmware dependency.

Does the VSC8662XIC-03 provide recovered clock outputs, and what are their specifications?

Yes, the VSC8662XIC-03 provides two independent recovered clock outputs: RCLK1 (125 MHz) and RCLK2 (25 MHz), both with ±100 ppm frequency tolerance and <1.5 ps RMS jitter (measured per IEEE 802.3-2018 Annex 40B). These clocks are derived directly from line-recovered timing and can drive FPGA transceivers or external MACs without additional jitter cleaning.

Can the VSC8662XIC-03 operate without external magnetics in 1000BASE-T mode?

Yes, the VSC8662XIC-03 supports transformerless 1000BASE-T operation using its integrated voltage-mode line driver and DC-coupled PHY interface. This mode is validated per IEEE 802.3-2018 Annex 40F and enables direct chip-to-chip or short-trace interconnects-ideal for compact industrial modules where magnetics would consume excessive PCB area.

How does the VSC8662XIC-03 implement IEEE 802.3af PoE support?

The VSC8662XIC-03 integrates full IEEE 802.3af Class 0–3 PoE sourcing capability, including signature detection, classification, and DC power delivery up to 15.4 W per port. It uses internal current sensing and thermal protection-no external PoE controller or sense resistors required. Power negotiation occurs transparently during link initialization.

What diagnostic features are built into the VSC8662XIC-03 for field maintenance?

The VSC8662XIC-03 includes VeriPHY cable diagnostics (locates opens/shorts within ±1 m), real-time CRC error counters, and five loopback modes (near-end, far-end, connector, SerDes, and packet generator). These features are accessible via standard MII registers or SMI interface-enabling automated diagnostics without proprietary tools or firmware updates.