Description
Computer Products EM951S Power Converter ±12VDC 375mA Out 5VDC In Molex ISA
The Computer Products EM951S is a compact DC-DC power converter module that accepts 5VDC input and generates a dual ±12VDC output at up to ±375mA. It is designed to derive ±12V rails from an existing 5V supply — a common need in PC and embedded systems where a peripheral or interface card requires ±12V for RS-232 level shifting, serial communications, or analog circuitry, but only a 5V source is locally available. The unit draws power through a standard 4-pin Molex drive connector and installs via an included ISA slot bracket.
Specifications & What's Included
- Manufacturer: Computer Products (Power Conversion division)
- Model: EM951S
- Input Voltage: 5VDC
- Output Voltage: ±12VDC (dual-rail)
- Output Current: ±375mA per rail
- Power Connector: 4-pin Molex (standard PC drive power)
- Date Code: 9307 (July 1993)
- Bracket: ISA slot bracket with DB25 (25-pin female) and DB15 (15-pin female) port openings
- Includes: EM951S converter module, ISA bracket, flat ribbon cable, Molex wiring harness with multi-wire output leads
Applications
DC-DC converter modules like the EM951S were widely used in 1990s-era PC expansion cards and embedded systems that needed ±12V rails — typically to power RS-232 serial line drivers (which require ±12V for proper voltage swings per the EIA-232 standard) — while drawing directly from the PC's 5V supply via a Molex drive connector. This approach allowed interface cards, I/O boards, and industrial controller cards to be self-contained without requiring a separate ±12V tap from the system power supply. Computer Products was a well-regarded U.S. manufacturer of embedded power conversion modules for industrial and commercial electronics throughout the 1980s and 1990s. These modules remain useful today for vintage system restoration, legacy industrial equipment maintenance, and custom embedded designs where a small ±12V supply is needed from a 5V source.
This Computer Products EM951S DC-DC Power Converter has been inspected and is in good used condition. The module, ISA bracket, ribbon cable, and Molex wiring harness are all present and show normal wear consistent with previous installation. No cracks, broken connectors, or obvious damage are visible. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Computer Products |
Model: |
EM951S |
MPN: |
EM951S |
Type: |
DC-DC Power Converter |
SKU: |
42962 |
Input Voltage: |
5VDC |
Output Voltage: |
±12VDC |
Output Current: |
±375mA |
Connector Type: |
Molex 4-pin (drive power) |
Interface/Bracket: |
ISA slot bracket |
Bracket Connectors: |
DB25 (parallel) and DB15 female ports |
Date Code: |
9307 (July 1993) |
Includes: |
Power converter module, ISA bracket, ribbon cable, Molex harness |
Form Factor: |
Module with ISA bracket |
Country/Region of Manufacture: |
United States |
Condition: |
Used – Inspected and Tested |
Condition Notes: |
Computer Products EM951S DC-DC Power Converter. Inspected and in good used condition. Module, ISA bracket, ribbon cable, and Molex harness all present. Normal wear, no obvious damage. Photos available. |
