Description
Semtech MP55C-3.3-2.8 Pentium P55C Processor VRM 2.8V Voltage Regulator Module
The Semtech MP55C-3.3-2.8 is a Voltage Regulator Module (VRM) designed to power Intel Pentium P55C processors requiring a 2.xV core supply. It accepts a 3.3V input from the motherboard and steps it down to a regulated 2.8V output for the processor core. The module plugs directly into a dedicated VRM slot on compatible Socket 7 motherboards, providing the split-voltage supply that P55C (MMX) Pentium processors require.
Specifications & What's Included
- Manufacturer: Semtech
- Part Number: MP55C-3.3-2.8
- Board Number: B17007, Rev B
- Input Voltage: 3.3V
- Output Voltage: 2.8V (2.xV core)
- Compatible Processor: Intel Pentium P55C (MMX) — Socket 7
- Form Factor: VRM daughter card with edge connector
- Components: Three electrolytic capacitors (C1, C2, C3), SMD resistors and capacitors on reverse
- Country of Manufacture: Mexico
- Date Code: 9713 (Week 13, 1997)
- UL Flammability Rating: 94V-0
Applications
Voltage Regulator Modules of this type were introduced in the mid-1990s to support the transition from single-voltage to dual-voltage x86 processors. The Intel Pentium P55C (commonly called the Pentium MMX) introduced a split-voltage design: the I/O circuitry ran at 3.3V while the processor core required a lower 2.8V supply — something most existing Socket 7 motherboards couldn't provide natively. VRM slots were added to Socket 7 boards specifically to accept plug-in modules like this one, allowing older or cost-optimized motherboards to support the newer P55C processors without a full redesign. This Semtech module fills that role, converting the board's 3.3V rail to the 2.8V the P55C core demands. It is relevant today for collectors and hobbyists restoring or maintaining late-1990s Socket 7 systems, as well as anyone keeping period-correct P55C-based machines operational.
This Semtech MP55C-3.3-2.8 Pentium P55C Processor Voltage Regulator Module has been inspected and appears to be in good used condition. The PCB is clean with no visible damage, and all three electrolytic capacitors and SMD components appear intact. This unit has not been powered up or tested at our facility, but it was pulled from a working environment where it was previously in use. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Semtech |
Model: |
MP55C-3.3-2.8 |
MPN: |
MP55C-3.3-2.8 |
Secondary Model: |
B17007 |
Hardware Revision: |
Rev B |
Type: |
Voltage Regulator Module (VRM) |
Compatible With: |
Intel Pentium P55C (Socket 7) processor |
Input Voltage: |
3.3V |
Output Voltage: |
2.8V |
Processor Compatibility: |
Intel Pentium P55C 2.xV |
Form Factor: |
Module / Daughter Card |
Country/Region of Manufacture: |
Mexico |
Date Code: |
9713 (Week 13, 1997) |
SKU: |
23006 |
Condition Notes: |
This Semtech MP55C-3.3-2.8 Pentium P55C VRM has been inspected and is in good used condition. PCB and components appear intact. Not tested at our facility; pulled from a working environment. Please contact us with any questions. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |