Product Overview
STMicroelectronics M27128AF1 128K (16K x 8) NMOS UV EPROM CDIP-28
Condition
Used equipment pull. Evaluation: Visual inspection only. Function testing not performed. Ceramic package and transparent quartz window are intact with straight pins. Markings legible: M27128AFI PGM 12.5V G88AH ST 9314 SINGAPORE.
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Product Overview
STMicroelectronics M27128AF1 (also marked M27128AFI) 128 Kbit (16,384 x 8) NMOS ultraviolet erasable programmable read-only memory. Housed in a standard 28-pin ceramic dual in-line package (CDIP-28 / FDIP28W) with an integrated clear quartz lid for UV erasure. Operates on a standard 5V read supply with a 12.5V programming voltage (VPP).
Key Features
- 128 Kbit memory density organized as 16K x 8 bits
- Standard 28-pin ceramic DIP package (CDIP-28) with transparent quartz window
- 12.5V VPP programming requirement (PGM 12.5V)
- 5V operating supply voltage (VCC)
- Week 14, 1993 date code (9314) manufactured in Singapore
Applications
- Direct board-level replacement in vintage arcade hardware, synthesizers, and legacy 8-bit or 16-bit industrial controllers
- Restoration and firmware burning for retro computing platforms requiring 27128-class memory
- Bench prototyping and firmware experimentation with UV-erasable non-volatile memory
Frequently Asked Questions
Has this EPROM been blank-checked or erased?
Visual inspection only. This chip is an equipment pull and may contain prior programming. UV erasure with an appropriate EPROM eraser is recommended prior to programming.
What programming voltage does this specific chip require?
Marked PGM 12.5V on the ceramic body, requiring a 12.5V VPP programming supply.
Why buy this individual pull instead of taking a chance on an untested bulk surplus lot?
Every piece listed here is individually inspected and photographed so you can verify the exact markings, window condition, and pin integrity before it reaches your bench. Standard shipping is an $8 flat rate, upgrades to free shipping once your order reaches $28, and orders leave our Idaho warehouse the same or next business day.
A classic windowed ceramic EPROM from the era of UV erase lamps and dedicated programmers, ready to drop into a legacy socket and bring a dormant board back to life.
