Microchip VSC8479 EOL: 10G XFP Transceiver PCN CBOL-03SULS573 (Aug 2026)

What changed #

Microchip published Product Change Notification CBOL-03SULS573 (process ID EOLPROCESS-324) on 7 August 2026, declaring End-of-Life for three catalog part numbers in the VSC8479 10G transceiver family:

• `VSC8479YHQ-01`
• `VSC8479YYY`
• `VSC8479YHQ-02`

The notice is listed in Microchip's own Product Change Notification table, which is the primary record buyers should rely on for the formal last-time-buy (LTB) and last-shipment (LTS) windows. Those exact dates sit inside the full PCN document rather than the summary table, so procurement teams should open the PCN directly rather than assume a date from secondary reporting.

The part behind the notice #

The VSC8479 is a 1:16 / 16:1 transceiver with an integrated clock-and-data recovery unit (CDR) and clock multiplier unit (CMU), running continuously from 9.953 Gbps to 11.3 Gbps across the full temperature range. It ships in a 195-pin HFCBGA (12 × 12 mm) package, runs on a single 1.8 V rail (with optional 3.3 V I/O), and talks to the host over I²C / SPI.

Its design target is optical-module and line-card hardware: XFP host ASIC SERDES, 300-pin MSA transponder modules, 10GE / 10GFC interfaces, and SONET/SDH and DWDM line cards. Microchip's product page already marks the broader VSC8479 family as *Not Recommended for new designs*, so this PCN formalizes a status that has been visible to designers for some time.

Why buyers should care #

Three groups feel this notice most directly:

• XFP optical-module manufacturers still shipping 10G SFP+/XFP transceivers

that reference the VSC8479 as the CDR/CMU device.

• Telecom and DWDM line-card teams whose boards were qualified around this

transceiver's jitter, equalization and clock-cleanup behavior.

• Long-life industrial and transport equipment built on 10G SONET/SDH or

legacy 300-pin MSA modules, where requalifying a replacement can mean a full documentation and certification cycle.

For new designs the message is simple: do not start with a part that is now under a formal EOL. For existing production, the clock is the constraint — the LTB window in the PCN is the last point at which orders will be accepted, and shipments between LTB and LTS are typically non-cancelable and non-returnable (NCNR).

Affected component areas #

• Optical transceivers and modules (XFP, 300-pin MSA)
• 10G line cards and DWDM equipment
• SONET/SDH transport hardware
• Industrial and transport systems on long qualification cycles

RFQ and sourcing checks #

Practical takeaway #

A 10G XFP CDR/CMU device rarely sits at the center of a design review, but once it is on a qualified board, its disappearance forces a requalification that costs far more than the part itself. If you build around the VSC8479, open Microchip PCN CBOL-03SULS573 now, lock the last-time-buy quantity to your demand forecast, and start the alternative search in parallel. Because discontinued transceivers are exactly the parts that attract remarked and pulled stock, verify authenticity on any secondary supply before it reaches the line.

Sources:

• Microchip Product Change Notifications — CBOL-03SULS573 / EOLPROCESS-324 (published 7 Aug 2026)
• Microchip VSC8479 product page (status: Not Recommended for new designs)