27C512L-15T - 512Kbit 64Kx8 CMOS EPROM 150ns | WSI
N.º da peça: 27C512L-15T ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
27C512L-15T Visão geral
An EPROM (Erasable Programmable Read-Only Memory) is a non-volatile memory IC whose contents are programmed electrically and erased with UV light in windowed packages (OTP versions are not erasable). Within the memory hierarchy, the 27C512 belongs to the classic parallel EPROM family descended from the Intel 2716/2764/27128/27256 lineage, occupying the 512 Kbit density point with a 64K x 8 organization that made it a de facto standard firmware storage device in embedded systems.
Key features include fast access time options as low as 45 ns across the family (150 ns for the -15 speed grade), a single +5 V power supply with a standard +/-10% tolerance, a +12.5 V VPP programming voltage with 100% Flashrite programming, and a JEDEC-approved pinout that guarantees mechanical and electrical interchangeability across manufacturers such as TI (TMS27C512), STMicroelectronics, Intel, and Philips.
The CMOS process delivers low power consumption during both active read and standby operation, making the L-grade variant well suited to battery-backed and power-sensitive designs. Address inputs A0-A15, eight tri-state data outputs O0-O7, chip enable (CE), output enable (OE), and VPP control provide a straightforward parallel memory interface to 8-bit microcontrollers and processors.
Typical applications include legacy firmware storage in industrial control systems, automotive ECUs, telecom line cards, arcade and test equipment, and embedded BIOS/firmware replacement in board-level maintenance and repair.
Design consideration: for new designs, prefer flash-based replacements (SST39SF512 or similar) that are pin-compatible; for repair and maintenance of existing sockets, the 27C512L-15T drop-in family preserves the original footprint and timing budget.
This page synthesizes distributor availability data, cross-reference options, and practical engineering guidance not consolidated in any single manufacturer datasheet.
Alternativas drop-in para 27C512L-15T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com 27C512L-15T (mesmo formato e footprint) — diferindo em Memory Type, Package, Organization, Access Time, Erase Method.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
27C512-15FA
✅ Drop-In✓ Em estoque
$1.65 / unidade
Ver ficha técnica →27C512MC-15
✅ Drop-In✓ Em estoque
$2.75 / unidade
Ver ficha técnica →27C512QC-55
✅ Drop-In✓ Em estoque
$4.22 / unidade
Ver ficha técnica →27C512-20FA
✅ Drop-In✓ Em estoque
$1.85 / unidade
Ver ficha técnica →27C512-20
✅ Drop-In✓ Em estoque
$4.1 / unidade
Ver ficha técnica →27C512-25-X
✅ Drop-In✓ Em estoque
$2.95 / unidade
Ver ficha técnica →27C512-15/LP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
27C512-15FA
✅ Drop-In✓ Em estoque
$1.65 / unidade
Ver ficha técnica →27C512L-15T Classificações máximas e características elétricas
| Tipo de memória | CMOS UV/OTP EPROM |
| Density | 512 Kilobit (64K x 8) |
| Organização da memória | 64K x 8-bit |
| Access Time | 150 ns (-15 speed grade) |
| Tensão de alimentação | +5 V +/-10% |
| Programming Voltage (VPP) | +12.5 V |
| Programming Algorithm | 100% Flashrite programming |
| Standby Current (CMOS) | 20 uA typical |
| Interface | Parallel |
| Pinout Standard | JEDEC-approved 27C512 pinout |
| Encapsulamento | 32-PLCC (T suffix) |
| Tipo de montagem | Surface Mount |
| Tipo de saída | Tri-state, 8-bit data bus (O0-O7) |
| Address Inputs | A0-A15 (16 address lines) |
| Control Signals | CE, OE, VPP |
| Status RoHS | unknown |
Guia de Configuração de Pinos do 27C512L-15T 32-plcc (t suffix)
Configuração de pinos para 27C512L-15T (pacote 32-plcc (t suffix)). Este CI digital inclui GPIO, interfaces de comunicação (UART, SPI, I2C) e pinos de alimentação. Consulte o datasheet do fabricante para funções alternativas dos pinos e opções de configuração. Essencial para projeto de sistemas embarcados e layout de PCB.
Nenhum dado detalhado de pinagem disponível para 27C512L-15T.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
27C512L-15T é adequado para 6 aplicaçãos: Legacy Firmware Storage in Industrial Controllers, Automotive ECU Repair and Remanufacturing, Telecom Line Card and Network Equipment Maintenance, Arcade, Pinball, and Coin-Op Game Restoration, Test and Measurement Instrument Firmware, BIOS and Embedded Board Firmware Replacement.
Legacy Firmware Storage in Industrial Controllers
The 27C512L-15T stores boot code and application firmware in PLCs, motor drives, and factory automation boards built around 8-bit MCUs. Its 64K x 8 organization maps directly onto 16-bit address buses (A0-A15), and the 150 ns access time supports CPU clocks of roughly 8-10 MHz without wait states. The single +5 V supply with +/-10% tolerance matches legacy industrial 5 V rails, and the JEDEC-approved pinout means a failed WSI part can be replaced by TI, ST, or Microchip 27C512 equivalents without PCB changes. The ~20 uA typical CMOS standby current limits drain in battery-backed controller memories. Performance consideration: reprogramming requires UV erasure or a fresh OTP device and a programmer supporting the 12.5 V Flashrite algorithm.
Recomendado
Automotive ECU Repair and Remanufacturing
Engine control units and body controllers from the 1980s-1990s frequently use 27C512 EPROMs for calibration tables and firmware. The 27C512L-15T offers a drop-in repair path: its JEDEC pinout and 64K x 8 organization match the original socket, and the -15 grade meets typical ECU bus timing. Because the L-grade draws only ~20 uA typical CMOS standby current, keep-alive memory rails are minimally loaded. Service shops re-burn updated fuel/spark maps into a blank OTP 27C512 and replace the socketed device. Note that automotive under-hood environments require the correct temperature-grade suffix; verify the commercial vs industrial variant against the original BOM before substitution.
Recomendado
Telecom Line Card and Network Equipment Maintenance
Legacy telecom rack equipment - channel banks, modems, and PBX cards - stores monitor code in 27C512 sockets. The 27C512L-15T suits spares programs: its parallel interface (CE, OE, tri-state data outputs) is trivially compatible with legacy bus architectures, and the 150 ns access time covers typical line-card processor timing. Stocking one 27C512 footprint spare covers multiple vendors' boards thanks to the JEDEC-standard pinout shared by TI TMS27C512, ST 27C512, and Intel CHMOS 27C512. Consideration: OTP versions cannot be erased for re-use; windowed ceramic packages (UV-erasable) are preferable where repeated re-programming of a spare is needed.
Recomendado
Arcade, Pinball, and Coin-Op Game Restoration
The coin-op restoration community relies on 27C512 EPROMs to rebuild game ROM sets, and the 27C512L-15T is a direct fit for boards designed for the 27C512 footprint. The 64K x 8 organization holds character/tile ROMs or program code segments, and the JEDEC pinout allows any vendor's 27C512 of equal or faster speed to be burned with the original image. The 150 ns -15 grade safely replaces slower original parts, but substituting a slower -20 or -25 grade into a timing-critical arcade board can cause graphical corruption or crashes, so match or exceed speed. Verify VPP requirements (12.5 V) against your EPROM programmer's algorithm list.
Recomendado
Test and Measurement Instrument Firmware
Older oscilloscopes, spectrum analyzers, and logic analyzers store boot firmware and calibration constants in 27C512 devices. The 27C512L-15T supports these sockets with its 64K x 8 array and 150 ns access time; its +/-10% supply tolerance tolerates noisy instrument power rails. For cal-lab environments, the CMOS low standby current (~20 uA typical) helps battery-powered portable instruments. Replacement workflow: read the original device, verify the checksum, program a fresh OTP 27C512, and re-seat. Because many instruments checksum their ROM at power-up, a partially programmed or marginal device will fail POST - always verify programmed content on the programmer before field installation.
Recomendado
BIOS and Embedded Board Firmware Replacement
PC motherboards, single-board computers, and embedded controllers of the 286/386 era used 27C512 EPROMs for system BIOS. The 27C512L-15T's 150 ns access time meets ISA-era BIOS fetch timing, and its 64K x 8 capacity matches the classic 64 KB BIOS image size. Repair technicians burn a known-good BIOS dump into a replacement device, preserving the original DIP-28/PLCC-32 footprint. The JEDEC-standard pinout means ST, TI, Intel, and Philips 27C512 parts are interchangeable in the same socket. Consideration: check whether the board decodes A15 - some boards treat the 27C512 as two banked 32 KB images selected by a jumper.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para 27C512L-15T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 27C512-15FA | 27C512-15/LP | 27C512-15 |
|---|---|---|---|---|
| Package | 32-PLCC | 32-PLCC - same | 32-PLCC - same | PLCC/DIP variants - verify footprint |
| Brand | WaferScale Integration (WSI) | WaferScale Integration | Microchip Technology | STMicroelectronics |
| Density / Organization | 512 Kbit, 64K x 8 | 512 Kbit, 64K x 8 | 512 Kbit, 64K x 8 | 512 Kbit, 64K x 8 |
| Access Time | 150 ns | 150 ns | 150 ns | 150 ns |
| Supply Voltage | +5 V +/-10% | +5 V +/-10% | +5 V | +5 V |
| Programming Voltage (VPP) | +12.5 V | +12.5 V | +12.5 V | +12.5 V |
| Pinout Standard | JEDEC-approved 27C512 | JEDEC 27C512 - identical | JEDEC 27C512 - identical | JEDEC 27C512 - identical |
| Lifecycle Status | Obsolete | Obsolete (aftermarket) | Aftermarket via Rochester | Obsolete (aftermarket) |
Principais diferenciais
- Low-power L-grade CMOS standby (vs 27C512-20)
- Faster timing headroom available in same family (vs 27C512-25-X)
- JEDEC-approved pinout enables cross-vendor sourcing (vs 27C512-15/LP)
Notas de projeto
The 27C512L-15T operates from a single +5 V supply with a standard +/-10% tolerance (4.5 V to 5.5 V). Decouple VCC with a 0.1 uF ceramic capacitor placed within 10 mm of the device, shared per socket on legacy boards. The L-grade CMOS design draws roughly 20 uA typical standby current when CE is high, so battery-backed rail designs see negligible drain; active read current should be budgeted from the datasheet ICC specification for your speed grade before sizing the 5 V rail.
Speed-grade substitution is the most common failure mode: replacing a -15 part with a -20 or -25 grade in a socket designed for 150 ns timing causes intermittent data corruption that often appears only at temperature extremes. Always match or exceed the original speed grade. Also confirm the package: 32-PLCC and 28-DIP versions of the 27C512 share the JEDEC pinout but are not mechanically interchangeable; adapters exist but add reliability risk in vibrating environments.
Tie unused control inputs to defined levels: CE and OE must be actively driven, never left floating, or the tri-state outputs may float and cause bus contention. Keep address/data trace lengths roughly matched on bus-heavy boards to minimize skew; for 150 ns timing budgets, skew of a few ns is tolerable but cumulative trace stubs on PLCC-to-DIP adapters can erode margin. Verify VPP is connected to +12.5 V only during programming - in normal read operation VPP/VCC pin must sit at VCC per the JEDEC 27C512 pinout.
Informações de conformidade
Device is obsolete; the original WSI 27C512L-15T predates modern RoHS enforcement and may contain lead in lead-frame finish and UV-window solder. No compliance data was found in the verified web sources.
