M27C512-12F - 512Kbit (64Kx8) 120ns UV EPROM CDIP-28 | STMicroelectronics
N.º da peça: M27C512-12F ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.2 | $72,00 |
| 100 | $5.95 | $595,00 |
| 500 | $4.8 | $2.400,00 |
| 1.000 | $3.95 | $3.950,00 |
M27C512-12F Visão geral
A UV EPROM (ultraviolet-erasable programmable read-only memory) is a type of non-volatile memory that retains its contents when power is removed and is erased by exposing the die to ultraviolet light through a quartz window in the package. The memory cell is a single FAMOS (floating-gate avalanche-injection MOS) transistor per bit, programmed by hot-electron injection and erased by photo-emission of stored charge. EPROM sits within the non-volatile memory hierarchy between mask ROM and EEPROM/Flash, and is most often used today for development, retro-computing, and industrial legacy systems where byte-wide parallel access and proven long-term retention are valued over in-system reprogrammability.
Key features of the M27C512-12F include 120 ns access time (suitable for 8 MHz microprocessors without wait states), low active current of 30 mA and standby current of 100 µA for power-sensitive designs, JEDEC-standard pinout compatibility with the 27C512 family, and 28-pin Frit Seal ceramic DIP packaging with UV-transparent window for erasure. The device supports TTL-compatible inputs and three-state outputs, and is programmed with a 12.5 V VPP supply via a standard EPROM programmer.
The M27C512 architecture uses a single-transistor FAMOS cell with on-chip latches for addresses and a 64 K x 8 organization, achieving byte-wide read access and full static operation (no clock required). The CMOS process provides low power consumption and high noise immunity, while the silicon-gate design ensures long-term data retention measured in decades. Program verification is performed with VPP at 12.5 V and VCC at 5 V.
Typical applications include 8051-family microcontroller firmware storage, industrial PLC and CNC bootloader ROM, retrocomputing and arcade game cartridge ROM, automotive engine-control firmware (legacy systems), and instrumentation firmware. The M27C512 is also widely used in development environments where rapid erase/reprogram cycles are needed before committing to OTP or masked ROM parts.
When designing with the M27C512-12F, ensure proper VPP programming voltage handling and observe maximum ratings to avoid permanent damage. Use a proper EPROM eraser (UV lamp at 253.7 nm) for erasure, and decouple VCC close to the device with a 0.1 µF ceramic capacitor. Note that the ceramic windowed package is ESD-sensitive and should be handled with standard CMOS precautions.
This page synthesizes distributor stock data, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers source and integrate this legacy UV EPROM part.
Alternativas drop-in para M27C512-12F — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
M27C512-10F1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
M27C512-15F1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
M27C512-12F1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AT27C512R-70PU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AT27C512R-90PU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AM27C512-200DC
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NM27C512Q-150
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
M27C512-12F Classificações máximas e características elétricas
| Tipo de memória | UV EPROM (Non-Volatile) |
| Tamanho da memória | 512 Kbit (64K x 8) |
| Organização da memória | 65536 words x 8 bits |
| Access Time | 120 ns |
| Supply Voltage (Vcc) | 5 V (±10%) |
| Programming Voltage (Vpp) | 12.5 V |
| Active Current (Icc) | 30 mA |
| Standby Current | 100 µA |
| Temperatura de operação | -40°C to +85°C |
| Encapsulamento | 28-pin CDIP (Frit Seal with Window) |
| Erasure Method | Ultraviolet light through window |
| Tipo de saída | Three-state, TTL-compatible |
| Technology | CMOS, FAMOS floating-gate cell |
| Contagem de pinos | 28 |
| Tipo de montagem | Through-Hole (DIP) |
| Status RoHS | Non-Compliant (contains Pb in ceramic package) |
Configuração de pinos do M27C512-12F
| Pino 1 | VPP — Programming voltage supply (12.5 V during programming) |
| Pino 2 | A12 — Address input A12 |
| Pino 3 | A7 — Address input A7 |
| Pino 4 | A6 — Address input A6 |
| Pino 5 | A5 — Address input A5 |
| Pino 6 | A4 — Address input A4 |
| Pino 7 | A3 — Address input A3 |
| Pino 8 | A2 — Address input A2 |
| Pino 9 | A1 — Address input A1 |
| Pino 10 | A0 — Address input A0 |
| Pino 11 | Q0 — Data output Q0 |
| Pino 12 | Q1 — Data output Q1 |
| Pino 13 | Q2 — Data output Q2 |
| Pino 14 | GND — Ground |
| Pino 15 | Q3 — Data output Q3 |
| Pino 16 | Q4 — Data output Q4 |
| Pino 17 | Q5 — Data output Q5 |
| Pino 18 | Q6 — Data output Q6 |
| Pino 19 | Q7 — Data output Q7 |
| Pino 20 | E\u2009/VPP — Chip Enable / Programming pin (active low) |
| Pino 21 | A10 — Address input A10 |
| Pino 22 | OE/VPP — Output Enable / Programming pin (active low) |
| Pino 23 | A11 — Address input A11 |
| Pino 24 | A9 — Address input A9 |
| Pino 25 | A8 — Address input A8 |
| Pino 26 | NC — Not connected (per JEDEC 27C512 pinout) |
| Pino 27 | GND — Ground |
| Pino 28 | VCC — Power supply (5 V) |
Aplicações típicas
M27C512-12F é adequado para 6 aplicaçãos: 8051 Microcontroller Firmware Storage, Industrial PLC and CNC Bootloader ROM, Retrocomputing and Arcade Game Cartridge ROM, Automotive Engine Control Firmware (Legacy Systems), Test and Measurement Instrumentation Firmware, Development Environment Firmware Prototyping.
8051 Microcontroller Firmware Storage
The M27C512-12F's 64K x 8 byte-wide organization and 120 ns access time directly match 8051-family external code-memory interfaces, enabling up to 64 KB of firmware without bank switching. Engineers place the EPROM on the lower 64 KB of the program address space and use the PSEN pin to gate OE. The 5 V single supply simplifies 8051 system power design, while the UV window allows rapid firmware iteration during development. Compared to mask ROM, the M27C512-12F eliminates NRE charges and lead time, ideal for prototyping and low-volume production.
Recomendado
Industrial PLC and CNC Bootloader ROM
Industrial PLC and CNC systems often use the M27C512-12F as a non-volatile bootloader ROM that survives harsh factory environments. The CDIP-28 ceramic package with Frit Seal offers better thermal and mechanical stability than plastic DIP, while the byte-wide parallel read interface enables fast firmware load at power-up. With a -40°C to +85°C operating range and proven decade-long data retention, the M27C512-12F remains in service for legacy industrial controllers where firmware updates are rare and long-term reliability is critical. The 120 ns access time meets typical 8/16-bit industrial bus speeds.
Recomendado
Retrocomputing and Arcade Game Cartridge ROM
Retrocomputing enthusiasts and arcade game restorers use the M27C512-12F in 28-pin EPROM sockets to replace original mask ROMs and PROMs in vintage 8-bit systems. The byte-wide organization suits Z80, 6502, 6809, and 8080 CPU buses, while the UV window allows re-erasing cartridges for new game software. Authentic CDIP-28 ceramic packaging matches the appearance of original parts, and the standard JEDEC 27C512 pinout ensures mechanical compatibility with EPROM sockets used in Commodore, Atari, and Apple II-era machines. Programming via TL866II Plus and similar modern programmers is straightforward.
Recomendado
Automotive Engine Control Firmware (Legacy Systems)
Legacy automotive engine control units (ECUs) from the 1990s used parallel EPROMs such as the M27C512-12F to store fuel-map and ignition calibration data. The 64K x 8 organization holds multiple calibration tables, while the 5 V operation matches ECU power rails of that era. Engineers servicing vintage vehicles use UV-erasable parts to re-flash calibrations during tuning without removing SMD components. Although obsolete for new automotive designs, the M27C512-12F remains relevant in classic-car restoration and aftermarket engine management where original ECU firmware must be preserved and re-burned.
Recomendado
Test and Measurement Instrumentation Firmware
Bench-top oscilloscopes, signal generators, and laboratory instruments built in the late 1980s and 1990s rely on parallel EPROMs such as the M27C512-12F for firmware storage. The 512 Kbit capacity holds bootloaders, calibration constants, and user-interface code for instrument front panels. Engineers repairing legacy test gear use the UV window to refresh firmware when replacement EPROMs are unavailable, and the 120 ns access time meets typical instrument bus cycles. Cross-brand compatibility with the JEDEC 27C512 pinout means any pin-compatible UV EPROM can be used as a substitute.
Recomendado
Development Environment Firmware Prototyping
The M27C512-12F is ideal for firmware prototyping where rapid erase/reprogram cycles are needed before committing to OTP or masked ROM parts. The UV-transparent window enables erasing in 20-30 minutes using a standard EPROM eraser, allowing engineers to iterate on firmware builds quickly. Compared to OTP (one-time programmable) variants, the M27C512-12F dramatically reduces development cost and time. With JEDEC-standard pinout and 12.5 V VPP programming, the part is supported by virtually every commercial EPROM programmer, including TL866II Plus, Xeltek SuperPro, and Data I/O programmers.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para M27C512-12F — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | M27C512-10F1 | M27C512-15F1 | M27C512-12F1 | AT27C512R-70PU | AT27C512R-90PU | AM27C512-200DC | NM27C512Q-150 |
|---|---|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | Microchip (Atmel) | Microchip (Atmel) | AMD | NSC |
| Package | CDIP-28 (Frit Seal with Window) | CDIP-28 (Frit Seal with Window) - same | CDIP-28 (Frit Seal with Window) - same | CDIP-28 (Frit Seal with Window) - same | PDIP-28 (plastic, drop-in 28-pin footprint) | PDIP-28 (plastic, drop-in 28-pin footprint) | CDIP-28 (Window) - same | CDIP-28 (Window) - same |
| Access Time | 120 ns | 100 ns (faster) | 150 ns (slower) | 120 ns (identical) | 70 ns (much faster) | 90 ns (faster) | 200 ns (slower) | 150 ns (slower) |
| Memory Size | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) |
| Supply Voltage | 5 V (±10%) | 5 V (±10%) | 5 V (±10%) | 5 V (±10%) | 5 V (±10%) | 5 V (±10%) | 5 V (±10%) | 5 V (±10%) |
| Programming Voltage (VPP) | 12.5 V | 12.5 V | 12.5 V | 12.5 V | 12.5 V | 12.5 V | 12.5 V | 12.5 V |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | 0°C to +70°C |
| Window (UV Erasable) | Yes | Yes | Yes | Yes | Yes (windowed) | Yes (windowed) | Yes (windowed) | Yes (windowed) |
| JEDEC 27C512 Pinout Compatible | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Same-family speed-grade coverage within ST (vs M27C512-10F1 and M27C512-15F1)
- JEDEC-standard 27C512 pinout enables cross-brand second sourcing (vs AT27C512R-70PU (Microchip))
- Authentic CDIP-28 ceramic Frit Seal windowed package (vs AT27C512R-70PU (PDIP-28 plastic))
Notas de projeto
The M27C512-12F is obsolete as of 2026-10-05 with no new production. For new designs, prefer Flash memory (e.g., AT29C040, SST39SF010) with adapted firmware, or pin-compatible second-source UV EPROMs such as the Atmel/Microchip AT27C512R series. If the M27C512-12F is required for a legacy retrofit, verify stock at multiple distributors and obsolete-market brokers; lead times can be 4-12 weeks at typical brokers.
Use a high-quality 28-pin DIP socket (machined-pin or premium tin/silver) to allow easy UV erasure and reprogramming cycles. Decouple VCC with a 0.1 µF ceramic capacitor placed within 5 mm of pin 28, and provide a bulk 1-10 µF tantalum capacitor on the same VCC node. Route OE/VPP and E/VPP control signals away from address/data lines to avoid crosstalk. Add a series resistor (100 Ω) on VPP if programming is performed in-circuit to limit current during fault conditions.
Address and data lines should be kept short and matched in length to within 10 mm to avoid skew at the 120 ns access time. With output loading of 100 pF (one TTL + bus capacitance), rise and fall times are approximately 30-50 ns per the ST datasheet. For high-noise industrial environments, add 10 kΩ pull-up resistors on OE and E to ensure defined logic levels when control signals float during power-up.
The M27C512-12F draws 30 mA active and 100 µA standby at 5 V. Estimated power dissipation is approximately 150 mW active and 0.5 mW standby per the ST datasheet typical characteristics. For battery-backed designs, switch to standby by de-asserting CE before main supply cutoff to leverage the 100 µA standby current. In systems without standby control, allow VCC decoupling close to the device to handle the 30 mA inrush during read cycles.
Informações de conformidade
Ceramic DIP packages historically contain Pb in the die-attach or seal glass. RoHS compliance status is non-compliant due to legacy Pb content. AEC-Q100 automotive qualification is not applicable. Verify latest compliance statements from STMicroelectronics or distributor.
