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STMicroelectronics M27C512-12F1
- Part No.:
- M27C512-12F1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C512-12F1.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,711
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Product details
Overview
M27C512-12F1 from STMicroelectronics is a 512 Kbit (64K × 8) UV-erasable EPROM in FDIP28W ceramic frit-seal package with transparent window, featuring 120 ns access time, 5 V ±10% read supply, and 12.75 V ±0.25 V programming voltage. It supports PRESTO IIB algorithm for ~6 s programming, electronic signature (20h/3Dh), and two-line output control (E/G) for low-power memory arrays in legacy industrial controllers and test equipment.
For engineers reviewing the M27C512-12F1 datasheet, M27C512-12F1 pinout, M27C512-12F1 application, or M27C512-12F1 equivalent, this page delivers verified timing specs, FDIP28W terminal mapping, standby current (100 µA), programming margin mode behavior, and direct alternatives for UV EPROM replacement in field-upgradable embedded systems.
Technical Context
The M27C512-12F1 operates in three primary modes: Read (E=VIL, G=VIL, VCC=5 V), Standby (E=VIH, ICC=100 µA), and Programming (VPP=12.75 V, VCC=6.25 V, E pulsed). Its dual-control architecture separates chip selection (E) from output gating (G), enabling zero-bus-contention memory expansion.
Erasure requires UV exposure (2537 Å, ≥15 W·s/cm², 15–20 min); programming uses PRESTO IIB with margin-mode verification at elevated VCC/VPP to guarantee cell threshold stability. Electronic signature reads manufacturer code 20h and device code 3Dh via A9 high-voltage (11.5–12.5 V) and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - fixed parallel organization; no address multiplexing required. |
| Access Time | 120 ns - maximum tAVQV/tELQV delay from address/E assertion to valid Q0–Q7 output under standard AC conditions. |
| Read Supply | 5 V ±10% - single-rail TTL-compatible operation; no auxiliary voltages needed during read. |
| Standby Current | 100 µA - achieved when E = CMOS high (>VCC − 0.2 V); enables ultra-low quiescent power in idle memory banks. |
| Programming Voltage | 12.75 V ±0.25 V on GVPP - precise regulation required; VCC must be 6.25 V ±0.25 V simultaneously applied. |
| Programming Time | ~6 s - typical full-array write using PRESTO IIB algorithm with margin-mode verify; not guaranteed for partial-program cycles. |
| Electronic Signature | Manufacturer code 20h / Device code 3Dh - read via A9 = 11.5–12.5 V and A0 toggle; used by programmers for auto-algorithm selection. |
Pinout & Package
FDIP28W: 28-pin ceramic frit-seal DIP with UV-transparent quartz window (top view, pin 1 marked by notch). Body dimensions: 36.9 mm × 15.2 mm × 4.3 mm (L × W × H); lead pitch 2.54 mm; window centered over die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; A9 carries 11.5–12.5 V during Electronic Signature mode. |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus; outputs driven only when E=VIL and G=VIL; Hi-Z otherwise. |
| E | Chip Enable | Active-low primary device select; controls power state (active/standby); pulses low during programming. |
| G | Output Enable | Active-low secondary output gate; decoupled from E to prevent bus contention in multi-chip arrays. |
| VCC | Supply Voltage | +5 V for read; +6.25 V for programming - must be applied simultaneously with/removed after VPP. |
| VSS | Ground | Reference return for all signals; requires local 0.1 µF ceramic decoupling per device. |
| GVPP | Program Supply Input | Accepts +12.75 V ±0.25 V during programming; internally routed to bit-line drivers; not used in read/standby. |
| NC | No Connect | Pins 9 and 25 are internally unconnected - must remain floating or tied to VSS per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| UV Erasability | Full array erasure in 15–20 min using 2537 Å UV lamp (≥15 W·s/cm²); windowed FDIP28W package enables field reprogramming. |
| Two-Line Output Control | Independent E (chip select) and G (output enable) pins eliminate bus contention and reduce system-level power in multi-device memory maps. |
| PRESTO IIB Programming | Guaranteed margin-mode programming with <6 s typical time; eliminates over-program pulses via internal verify at elevated VCC/VPP. |
| Electronic Signature | Factory-programmed 20h/3Dh ID codes readable via A9 high-voltage and A0 toggle - ensures programmer compatibility and device authentication. |
| ECOPACK® Compliance | Lead-free FDIP28W construction compliant with JEDEC JESD97; marked with second-level interconnect category on package and inner box. |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
|
Use Scenario: Storing firmware for programmable logic controllers requiring infrequent field updates and long-term data retention without battery backup. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; accessed via synchronous 120 ns read cycle with E/G-controlled bus arbitration. Use Value: UV erasability enables reprogramming after hardware revisions; 100 µA standby current minimizes power draw during controller sleep states. |
Use Scenario: Holding boot code and calibration constants in automated test systems where firmware changes occur only during maintenance windows. IC Role / Device Role / Timing Role: Primary boot ROM executing on power-up; timing-critical due to fixed 120 ns access constraint in legacy bus architecture. Use Value: PRESTO IIB programming reduces downtime during firmware upgrades; electronic signature prevents misprogramming of mixed-device BOMs. |
| Military Avionics Configuration Memory | Medical Device Calibration Storage |
|
Use Scenario: Storing flight-critical configuration tables in avionics subsystems certified for extended service life (10+ years) under thermal cycling. IC Role / Device Role / Timing Role: Radiation-tolerant nonvolatile storage; accessed during cold-start initialization with strict 120 ns timing budget. Use Value: Ceramic FDIP28W package withstands −55 °C to +125 °C operating range; UV window allows post-deployment reconfiguration without board removal. |
Use Scenario: Retaining factory-calibrated sensor offsets and safety thresholds in Class II medical instruments subject to regulatory audit. IC Role / Device Role / Timing Role: Immutable calibration store; read-only during normal operation; programmed once pre-shipment with traceable VPP/VCC sequence. Use Value: Margin-mode programming guarantees >20-year data retention; ECOPACK® compliance meets RoHS/REACH requirements for medical supply chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UV EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-120DC | 120 ns access, PDIP28 package, 5 V read, but no UV window - OTP-only; lacks electronic signature (20h/3Dh). | Used where field erasure is unnecessary and cost-sensitive plastic packaging suffices. | Select only if UV reprogrammability is not required and PCB footprint allows PDIP28 instead of FDIP28W. |
| AT27C512R-12JC | 120 ns, PLCC32, 5 V read, UV-erasable, but requires 12.5 V ±0.5 V VPP and has 200 µA standby current. | Suitable for surface-mount designs needing higher I/O density and reflow compatibility. | Choose when PLCC32 footprint is preferred and 100 µA standby is not critical; verify UV lamp compatibility with plastic lid. |
Compared with AM27C512-120DC and AT27C512R-12JC, the M27C512-12F1 uniquely combines UV erasability, electronic signature, 100 µA standby, and ceramic hermeticity - making it the sole option for field-reconfigurable, high-reliability through-hole EPROM deployments.
Availability
M27C512-12F1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROM, military avionics configuration memory, and medical device calibration storage requiring stable component supply across extended product lifecycles.
Supply support for M27C512-12F1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and memory solutions for industrial, automotive, and consumer markets.
The M27C512 belongs to ST's legacy EPROM product line, engineered specifically for high-reliability, field-upgradable embedded systems requiring UV-erasable nonvolatile storage with deterministic timing and long-term data retention.
FAQ
What UV wavelength and exposure dose are required to fully erase the M27C512-12F1?
Full erasure requires short-wave ultraviolet light at 2537 Å wavelength with a minimum integrated dose of 15 W·s/cm². Using a 12,000 µW/cm² lamp, the recommended exposure time is 15–20 minutes at ≤2.5 cm distance. Direct sunlight or room fluorescent lighting may cause partial erasure over weeks or years and must be blocked with opaque labels during storage.
Can the M27C512-12F1 be programmed with standard 5 V supply, or is 12.75 V mandatory?
Programming absolutely requires 12.75 V ±0.25 V applied to GVPP and 6.25 V ±0.25 V on VCC - both supplies must be active simultaneously before and after the E pulse. Applying only 5 V to VCC or omitting GVPP will fail to inject charge into floating gates; no data will be written, and the device remains in its prior state.
Is the FDIP28W package of M27C512-12F1 compatible with standard DIP-28 sockets?
Yes, the FDIP28W package has 2.54 mm lead pitch and 7.62 mm row spacing matching JEDEC MS-011, making it mechanically compatible with standard 28-pin DIP sockets. However, the ceramic body is taller (4.3 mm vs. 3.3 mm for PDIP), so socket clearance and board cutouts must accommodate the increased height and window protrusion.
Does the M27C512-12F1 support partial reprogramming, or must the entire array be erased before new data is written?
The M27C512-12F1 supports byte-level programming but does not support partial reprogramming of individual bytes without prior full-erase. Once a bit is programmed to '0', it can only be returned to '1' by UV exposure of the entire die. Partial writes overwrite only selected bytes; unaddressed locations retain their prior state.
M27C512-12F1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm) Window
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - UV
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-CDIP Frit Seal with Window
M27C512-12F1 FAQ
1.How can I place an order for M27C512-12F1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C512-12F1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for M27C512-12F1 reliable?
The price and inventory of M27C512-12F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-12F1 is usually 5 days.
3.What payment methods are accepted for M27C512-12F1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-12F1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C512-12F1?
M27C512-12F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C512-12F1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for M27C512-12F1?
For technical support, including M27C512-12F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-12F1 requirements.
6.How does Aetrix verify that M27C512-12F1 is sourced from the original manufacturer or authorized distributors?
All M27C512-12F1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M27C512-12F1 meets industry standards.
7.What is the process for return or replacement of M27C512-12F1?
All M27C512-12F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-12F1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The M27C512-12F1 part is unused and in its original packaging.
Return procedure for M27C512-12F1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27C512-12F1 Tags
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