27C512MC-15 - 512Kbit CMOS EPROM 150ns | MX | Embedded Systems
MPN: 27C512MC-15 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.4 | $340.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.75 | $2,750.00 |
Drop-in alternatives for 27C512MC-15 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
27C512-15FA
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →27C512A-12I/SO
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →27C512-20
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →27C512-25-X
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →M27C512
✅ Drop-In📋 Reference alternative (not in catalog)
MBM27C512-15
✅ Drop-In📋 Reference alternative (not in catalog)
27C512-15/LP
✅ Drop-In📋 Reference alternative (not in catalog)
27C512MC-15 Maximum Ratings & Electrical Characteristics
| Memory Size | 512 Kbit |
| Organization | 64K x 8 |
| Access Time | 150 ns |
| Memory Type | EPROM (UV/OTP) |
| Interface | Parallel |
| Supply Voltage (Read) | 5 V |
| Programming Voltage (VPP) | 12.5 V |
| Operating Mode | Completely static |
| Input/Output Compatibility | TTL compatible |
| Address Inputs | 16 (A0-A15) |
| Data Outputs | 8 (O0-O7), tri-state |
| Control Pins | CE (active-low), OE (active-low), PGM |
| Family Speed Grades | 45/55/70/90/100/120/150 ns |
| RoHS Status | unknown |
27C512MC-15 [data_needed: exact package of 27c512mc-15 suffix (28-pin dip/plcc/soic not confirmed in verified data)] Pin Configuration Guide
Complete pinout information for 27C512MC-15 ([data_needed: exact package of 27c512mc-15 suffix (28-pin dip/plcc/soic not confirmed in verified data)] package) with CE (active-low), OE (active-low), PGM pins. This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
![[data_needed: exact package of 27c512mc-15 suffix (28-pin dip/plcc/soic not confirmed in verified data)] package pinout diagram for 27C512MC-15](/assets/package-diagrams/default.svg?v=1789225621)
No detailed pinout data available for 27C512MC-15.
Refer to the datasheet for full pin configuration.
Estimated pin count: CE (active-low), OE (active-low), PGM pins (digital package)
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
27C512MC-15 is suitable for 6 applications: Arcade Game Board Repair, Automotive ECU Reprogramming, Industrial PLC Firmware Storage, Retro-Computing and Homebrew Computers, Telecom Equipment Boot Code, Test and Measurement Instrument Firmware.
Arcade Game Board Repair
Classic arcade PCBs from the 1980s and 1990s rely heavily on 27C512 EPROMs for game code, graphics tables, and sound data. The 27C512MC-15's 64K x 8 organization and 150 ns access time match the timing budgets of 6809, Z80, and 68000-based boards, whose ROM sockets were designed around 200-250 ns devices - the -15 grade provides comfortable margin. The CMOS process runs cooler and draws less current than the original NMOS parts, reducing stress on aging power supplies. Repair workflow: read a known-good chip, verify the checksum, program the 27C512MC-15 at +12.5V VPP on a CMOS-capable programmer, then re-verify on a ROM reader before installing in the socket. Genuine OTP/UV EPROMs remain preferred over flash adapters for authenticity and timing fidelity.
Recommended
Automotive ECU Reprogramming
Engine control units of the late 1980s through 1990s frequently used 27C512 OTP/UV EPROMs to hold fuel and ignition calibration maps. Tuners and remapping shops replace the stock chip with a programmed 27C512MC-15 carrying revised maps; the 150 ns access time safely meets ECU microcontroller bus timing that typically allowed 200-300 ns ROMs. The single +5V read supply matches the vehicle's 5V logic rail, while programming at +12.5V VPP happens off-board on a bench programmer. Because OTP versions cannot be erased, shops keep UV-windowed versions for iterative tune development and switch to OTP for final customer units. Always verify checksum and map region addresses before shipping a recalibrated ECU, and confirm the ECU uses the 28-pin 27C512 footprint rather than a daughterboard adapter.
Recommended
Industrial PLC Firmware Storage
Legacy programmable logic controllers and industrial drives store executive firmware and ladder-logic images in 27C512 EPROMs. These environments prize the EPROM's absolute immutability: unlike flash, a stored program cannot be corrupted by noise, brownouts, or runaway write cycles, which matters in electrically noisy factory settings. The 27C512MC-15's completely static operation and TTL-compatible I/O interface directly to 5V microprocessor buses without glue logic, and the tri-state outputs let several ROMs share one data bus under active-low CE/OE control. Industrial temperature ranges and the non-volatile 20-year-class data retention of CMOS EPROMs support equipment expected to run for decades. Maintenance teams should stock pre-programmed spares because this family is EOL and broker lead times are unpredictable.
Recommended
Retro-Computing and Homebrew Computers
Retro-computer restoration and homebrew 8-bit/16-bit computer projects use the 27C512MC-15 for monitor ROMs, BASIC interpreters, and cartridge images. The 64K x 8 density doubles the 27C256, letting a single chip bank-select two 32K images via the top address pin - a common trick in homemade cartridge boards. The 150 ns grade meets the timing of 1-8 MHz 6502, Z80, and 68008 systems with wide margin, and CMOS low standby current suits battery-backed or low-power builds. Hobbyists program at +12.5V VPP on modern universal programmers and can erase UV-windowed parts for reuse during development, then finalize on OTP. For authenticity in museum-grade restorations, period-correct EPROMs like the 27C512 family remain preferred over flash substitutes that alter the board's electrical character.
Recommended
Telecom Equipment Boot Code
Older telecom infrastructure - channel banks, PBX cards, modems, and network line cards - boots from 27C512-class EPROMs holding bootstrap code and firmware. The JEDEC-standard 28-pin footprint means a replacement 27C512MC-15 drops directly into field-serviceable sockets designed decades ago. Its 150 ns access time supports the mid-speed buses typical of these systems, while TTL-compatible tri-state outputs permit multiple ROM/mapped-memory devices on shared buses. The EPROM's immunity to in-circuit corruption is a reliability asset in remote unattended sites where a failed boot device means a truck roll. Service organizations should image and archive all boot ROMs while hardware is still operational, program replacement 27C512 devices at +12.5V VPP, and label revisions on the chip window sticker to preserve configuration control across maintenance cycles.
Recommended
Test and Measurement Instrument Firmware
Bench instruments from the 1990s - oscilloscopes, spectrum analyzers, and power supplies - store firmware and calibration constants in 27C512 EPROMs. Restoring or updating these instruments requires matching the original EPROM family: the 27C512MC-15's 64K x 8 organization and 150 ns timing fit the 68000-family processors common in such instruments. Calibration data benefits from the EPROM's non-volatile, write-protected nature; accidental corruption from firmware bugs is impossible. Because many instruments interleave several ROMs with staggered CE/OE decode, the tri-state outputs and fast CE-to-output access of the CMOS 27C512 keep bus contention windows safe. Labs maintaining legacy instruments should keep blank 27C512 stock, a +12.5V-capable programmer, and archived firmware images; with the family EOL, pooled spares strategies are strongly recommended.
Recommended
Recommended Products Summary
Engineering reference data for 27C512MC-15 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 27C512-15FA | 27C512-15/LP | M27C512 | MBM27C512-15 |
|---|---|---|---|---|---|
| Package | 28-pin 27C512 JEDEC (suffix MC package option unconfirmed) | 28-pin 27C512 JEDEC - same | 32-PLCC (11.43 x 13.97 mm) | 28-pin 27C512 JEDEC (DIP/PLCC options) | 28-pin 27C512 JEDEC - same |
| Brand | MX | MX | Microchip Technology | STMicroelectronics | Fujitsu |
| Memory Size / Organization | 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 |
| Access Time | 150 ns | 150 ns | 150 ns | [DATA_NEEDED] | 150 ns |
| Read Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Programming Voltage (VPP) | 12.5 V | 12.5 V | 12.5 V | 12.5 V | [DATA_NEEDED] |
| Memory Technology | CMOS EPROM (UV/OTP) | CMOS EPROM | EPROM - OTP | EPROM (UV + OTP ranges) | CMOS UV EPROM |
| Lifecycle Status | EOL | EOL (broker/aftermarket stock) | Active via Rochester Electronics aftermarket | EOL | Obsolete |
Key Differentiators
- Fast 150 ns speed grade in an EOL family (vs 27C512-25-X)
- CMOS process power advantage (vs MBM27C512-15)
- Genuine EPROM authenticity vs flash substitutes (vs M27C512)
Design Notes
Never program a CMOS 27C512 such as the 27C512MC-15 with the 21V VPP used for first-generation NMOS 27-series EPROMs - the CMOS die is rated for 12.5V programming voltage and 21V will destroy it. Configure the programmer device selection explicitly for CMOS 27C512/12.5V, and if using an auto-detect programmer, confirm the detected algorithm before burning. Always perform a blank-check, program, and full verify pass, and retain the verified binary image with a checksum for future reprogramming needs.
Although the 150 ns access time is generous for 5V buses, verify both tAA (address access) and tCE (chip-enable to output) against your CPU timing. Systems designed around 200-250 ns ROMs have ample margin, but overclocked retro builds and faster embedded controllers may need the 70 ns or 100 ns grades instead. Keep address-line trace lengths matched within a few centimeters on new PCBs, and decouple VCC with 100 nF ceramic directly at the IC to prevent address-line glitching during bus transitions.
For UV-windowed parts, plan for erasure access in the final enclosure or use OTP versions where firmware is final - UV erasure requires the quartz window to receive 15 Ws/cm2-class UV dose, typically 15-30 minutes in an EPROM eraser. Unused address pins must not be left floating on bank-selected designs; tie the top address pin (A15) via jumper to support 27C256-emulation or full 64K decoding. Observe active-low CE/OE polarity - miswiring these holds tri-state outputs disabled and mimics a blank device, a frequent false-fault diagnosis.
Compliance Information
EOL EPROM family; compliance declarations not available in verified web data. Legacy parts may be exempt from RoHS as spare-parts for pre-2006 equipment - confirm with supplier.
