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STMicroelectronics M27C512-12B1
- Part No.:
- M27C512-12B1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
M27C512-12B1.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,854
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Product details
Overview
M27C512-12B1 from STMicroelectronics is a 512 Kbit (64K × 8) UV-erasable EPROM in 28-pin PDIP package, featuring 120 ns access time, 5 V ±10% read supply, 30 mA active current, and 100 µA CMOS standby current. It supports two-line output control (E and G), electronic signature (20h/3Dh), and PRESTO IIB programming with ~6 s typical write time - used in legacy industrial controllers, boot ROMs, and FPGA configuration storage where non-volatility and UV reprogrammability are required.
For engineers reviewing the M27C512-12B1 datasheet, M27C512-12B1 pinout, M27C512-12B1 application, or M27C512-12B1 equivalent, key selection criteria include UV erasure capability, TTL-compatible address/data interface, 12.75 V programming voltage, 64K×8 organization, and compatibility with standard EPROM programmers supporting PRESTO IIB algorithm and Electronic Signature verification.
Technical Context
The M27C512-12B1 operates in four primary modes: Read (E=VIL, G=VIL), Standby (E=VIH), Programming (E pulsed low with VPP=12.75 V), and Electronic Signature (A9=12 V). Its dual-control architecture separates chip enable (E) for power gating and output enable (G) for bus contention avoidance - enabling low-power memory arrays with deterministic timing.
Programming uses a verified PRESTO IIB algorithm with margin-mode verification at 6.25 V VCC and 12.75 V VPP, applying 100 µs pulses per byte until successful verify at both nominal and reduced VCC (4.2 V and 6 V) to ensure long-term data retention. Erasure requires 15 W·sec/cm² UV dose (2537 Å) for full bit reset in 15–20 minutes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - provides 65,536 addressable bytes for firmware or lookup table storage. |
| Access Time | 120 ns - defines maximum clock rate for synchronous read cycles in microcontroller boot interfaces. |
| VCC Supply | 5 V ±10% - compatible with legacy 5 V TTL/CMOS logic systems without level translation. |
| Standby Current | 100 µA - enables low-power hold state during system sleep in battery-backed instrumentation. |
| Programming Voltage | 12.75 V ±0.25 V on GVPP - requires dedicated high-voltage supply rail, not derived from VCC. |
| Electronic Signature | Manufacturer code 20h, Device code 3Dh - enables automatic device identification in universal programmers. |
| UV Erase Time | 15–20 min @ 12,000 µW/cm² - mandates quartz-window FDIP package; PDIP variant M27C512-12B1 is OTP-only. |
Pinout & Package
Package: PDIP28 (Plastic Dual In-line Package, 600 mil width, RoHS-compliant ECOPACK® lead-free finish).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus accepting 0x0000–0xFFFF; TTL-compatible, VIH ≥ 2 V, VIL ≤ 0.8 V. |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus (output only in read mode); VOH = VCC–0.7 V (CMOS), VOL = 0.4 V. |
| E | Chip Enable | Active-low device select; controls power state - VIH > VCC–0.2 V places device in 100 µA standby. |
| G | Output Enable | Active-low output gate; independent of E - allows shared G line across multiple EPROMs to prevent bus contention. |
| GVPP | Program Supply / Output Enable | Dual-function pin: VPP = 12.75 V during programming; acts as G in read mode when pulled low. |
| VCC | Supply Voltage | 5 V ±10% for read; 6.25 V ±0.25 V required during programming - must be applied before/with VPP. |
| VSS | Ground | Reference return for all signals; decoupling requires 0.1 µF ceramic capacitor placed adjacent to pin. |
| NC | No Connect | Pins 12 and 25 are internally unconnected - must remain floating or tied to ground per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Enables zero-bus-contention memory expansion - E selects device power state, G gates outputs independently. |
| PRESTO IIB programming | Reduces full-array programming to ~6 s with margin-mode verify at 4.2 V/6 V, ensuring robustness over lifetime. |
| Electronic Signature (20h/3Dh) | Allows auto-detection by programmers via A9=12 V pulse and A0 toggling - eliminates manual part selection errors. |
| ECOPACK® compliance | Lead-free PDIP28 package meeting JEDEC JESD97 second-level interconnect marking and RoHS requirements. |
| Low standby current | 100 µA at VIH on E - critical for maintaining firmware integrity in always-on industrial control modules. |
Applications
| Industrial PLC Boot ROM | FPGA Configuration Storage |
|---|---|
|
Use Scenario: Stores startup firmware for programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; accessed during cold start with strict 120 ns tACC timing. Use Value: UV-erasable capability allows field firmware updates using portable UV erasers; 100 µA standby current minimizes backup battery drain during power loss. |
Use Scenario: Holds configuration bitstream for Xilinx Spartan or Altera MAX II FPGAs in test equipment requiring deterministic power-up behavior. IC Role / Device Role / Timing Role: Parallel-programmed EPROM providing synchronous 8-bit data to FPGA CONFIG_DATA pins during INIT phase. Use Value: PRESTO IIB programming enables rapid bitstream iteration in lab settings; Electronic Signature prevents misprogramming of similar-density EPROMs. |
| Legacy Medical Instrument BIOS | Avionics Test Set Calibration Data |
|
Use Scenario: Stores calibration constants and safety-critical initialization routines in Class II medical devices certified to IEC 62304. IC Role / Device Role / Timing Role: Read-only memory accessed during POST; requires guaranteed data retention >10 years under thermal stress. Use Value: UV erasure enables recalibration after sensor drift without PCB rework; 12.75 V VPP ensures immunity to accidental programming from 5 V system noise. |
Use Scenario: Holds flight-line test parameters and transducer compensation tables in MIL-STD-810G-rated avionics ground support equipment. IC Role / Device Role / Timing Role: OTP EPROM variant used where reprogramming is prohibited post-certification; accessed via discrete address decoder. Use Value: PDIP28 package supports through-hole mounting for vibration resistance; ECOPACK® compliance meets DoD Directive 8570.01-M soldering requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-12DC | 120 ns access, 5 V operation, but uses AMD's proprietary programming algorithm and lacks Electronic Signature (20h/3Dh). | Requires AMD-specific programmer firmware; no auto-ID - increases risk of misprogramming in multi-vendor labs. | Select only if existing infrastructure is AMD-programmer locked and UV erasure is not required. |
| AT27C512R-12PU | 120 ns, 5 V, same 64K×8 organization, but features enhanced ESD protection (4 kV HBM) and faster 100 ns option; no UV window. | OTP-only; cannot be erased - suitable for production firmware but unsuitable for prototyping or field updates. | Prefer for volume production where firmware is final; avoid where iterative development or field recalibration is needed. |
Compared with AM27C512-12DC, M27C512-12B1 offers guaranteed Electronic Signature compatibility and ST's PRESTO IIB algorithm for faster, more reliable programming; versus AT27C512R-12PU, it retains UV erasability essential for engineering validation and maintenance workflows.
Availability
M27C512-12B1 is available at Aetrix Electronics and suitable for industrial PLC boot ROMs, FPGA configuration storage, and legacy medical instrument BIOS requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for M27C512-12B1 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, specializing in automotive, industrial, and power management ICs with strong heritage in non-volatile memory design.
The M27C512 belongs to ST's legacy EPROM product line, engineered for reliability in mission-critical embedded systems where data integrity, long-term retention, and field-serviceable reprogramming are mandatory.
FAQ
Is M27C512-12B1 UV-erasable or one-time programmable?
M27C512-12B1 is packaged in PDIP28 (suffix 'B'), which lacks a quartz window and is therefore OTP-only. Only FDIP28W ('F') variants support UV erasure. This part must be programmed once and retained indefinitely - no ultraviolet light exposure will affect its data.
What is the correct VCC voltage during programming?
VCC must be set to 6.25 V ± 0.25 V during programming - not 5 V. This higher voltage ensures proper oxide stress for reliable Fowler-Nordheim tunneling. Applying 5 V during programming risks incomplete cell programming and subsequent read failures.
Can M27C512-12B1 share a common G (output enable) line with other memory devices?
Yes - the two-line control architecture explicitly supports shared G lines across multiple EPROMs. With E decoded per device and G common, only the selected device drives the bus while others remain in high-Z, eliminating contention and reducing system-level decoupling complexity.
Does M27C512-12B1 require external pull-ups on Q0–Q7 outputs?
No - the outputs are active-push-pull CMOS drivers capable of sinking 2.1 mA and sourcing 100 µA (VOH = VCC – 0.7 V). Pull-ups are unnecessary and may cause excessive current draw during output transitions or conflict with bus arbitration logic.
M27C512-12B1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- 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-PDIP
M27C512-12B1 FAQ
1.How can I place an order for M27C512-12B1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C512-12B1 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 M27C512-12B1 reliable?
The price and inventory of M27C512-12B1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-12B1 is usually 5 days.
3.What payment methods are accepted for M27C512-12B1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-12B1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C512-12B1?
M27C512-12B1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C512-12B1 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 M27C512-12B1?
For technical support, including M27C512-12B1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-12B1 requirements.
6.How does Aetrix verify that M27C512-12B1 is sourced from the original manufacturer or authorized distributors?
All M27C512-12B1 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 M27C512-12B1 meets industry standards.
7.What is the process for return or replacement of M27C512-12B1?
All M27C512-12B1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-12B1, 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 M27C512-12B1 part is unused and in its original packaging.
Return procedure for M27C512-12B1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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