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STMicroelectronics M27W512-100K6
- Part No.:
- M27W512-100K6
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
M27W512-100K6.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,700
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Product details
Overview
M27W512-100K6 from STMicroelectronics is a 512 Kbit (64 K × 8) one-time programmable EPROM optimized for low-voltage microprocessor systems, featuring 2.7–3.6 V read operation, 100 ns access time, and PLCC32 packaging. It delivers 15 µA max standby current and supports PRESTO IIB programming at 100 µs/byte, enabling battery-constrained embedded firmware storage in industrial controllers and legacy instrumentation.
For engineers reviewing the M27W512-100K6 datasheet, M27W512-100K6 pinout, M27W512-100K6 application, or M27W512-100K6 equivalent, this page provides verified functional identity, validated PLCC32 terminal mapping, confirmed OTP programming behavior, and real-world system integration constraints - all derived from ST's official Rev 4 datasheet (June 2008).
Technical Context
The M27W512-100K6 implements a two-line output control architecture with independent Chip Enable (E) and Output Enable (G) inputs, enabling low-power array expansion without bus contention. Its CMOS OTP cell structure supports electronic signature verification (Manufacturer code 20h, Device code 3Dh) and margin-mode programming at elevated VCC (≥5 V) to ensure data retention reliability.
Programming requires dual-supply conditions: VPP = 12.75 V ± 0.25 V and VCC = 6.25 V ± 0.25 V during pulse programming, while read mode operates strictly on single 2.7–3.6 V supply across –40 to +85 °C. Standby current drops to 15 µA when E is high, and outputs enter high-impedance state regardless of GVPP level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 512 Kbit (64 K × 8), fixed parallel organization for direct MPU interface without address multiplexing |
| Read access time | 100 ns max at VCC = 2.7–3.6 V, defining minimum CPU wait-state requirement for 8-bit bus timing |
| Supply voltage (read) | 2.7–3.6 V - enables direct connection to 3.3 V logic rails and extends battery life in portable systems |
| Standby current | 15 µA max at VCC ≤ 3.6 V - critical for low-power sleep modes in metering and sensor nodes |
| Programming time | 100 µs per byte using PRESTO IIB algorithm - reduces total firmware burn time vs. legacy EPROMs |
| ESD protection | 2000 V HBM - ensures robustness during manual handling and board-level assembly |
| Operating temperature | –40 to +85 °C - qualified for industrial control environments without derating |
Pinout & Package
Package: PLCC32 (Plastic Leaded Chip Carrier, 32-pin, JEDEC MS-026AC), ECOPACK® lead-free, body size 11.43 mm × 11.43 mm × 3.56 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit parallel address bus; A9 used for Electronic Signature activation at 12 V |
| Q0–Q7 | Data outputs | 8-bit bidirectional data bus - outputs only in Read/Verify; latched during Program mode |
| E | Chip Enable | Active-low primary device select; high = Standby (15 µA), low = active read/program |
| G | Output Enable | Active-low secondary output gate; decoupled from E to prevent bus contention in memory arrays |
| VPP | Program supply | 12.75 V input required only during programming; must be applied simultaneously with VCC |
| VCC | Power supply | 2.7–3.6 V for read; 6.25 V ±0.25 V for programming - dual-voltage domain operation |
| VSS | Ground | Reference for all DC and AC timing; requires local 0.1 µF ceramic decoupling |
| NC / DU | No connect / Don't use | Pins 2, 18, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31 - internally unconnected or reserved |
Key Features
| Feature | Design Value |
|---|---|
| Two-line output control (E + G) | Enables zero-bus-contention memory expansion by placing deselected devices in true Hi-Z standby |
| PRESTO IIB programming | Guarantees full-array programming in ~6.5 s with built-in margin verification at elevated VCC |
| Electronic signature support | Manufacturer code 20h and device code 3Dh readable via A9=12 V and A0 toggle - enables auto-algorithm selection in programmers |
| Low-voltage read compatibility | Operates down to 2.7 V at full speed - eliminates need for level shifters in 3.3 V systems |
| ECOPACK® RoHS-compliant package | Lead-free PLCC32 with JEDEC JESD97 marking - meets industrial environmental compliance requirements |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Legacy Medical Instrumentation Firmware Storage |
|---|---|
Use Scenario: Storing fixed configuration tables and calibration constants in DIN-rail mounted PLC modules operating continuously at 50–85 °C ambient. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to 8-bit Z80 or 8051-based controller bus; accessed during boot and runtime parameter lookup. Use Value: 100 ns access time eliminates wait states; 15 µA standby current minimizes thermal load in sealed enclosures. |
Use Scenario: Holding FDA-cleared diagnostic firmware in discontinued patient monitors where field reprogramming is prohibited and long-term bit stability is mandated. IC Role / Device Role / Timing Role: One-time programmed boot ROM; verified via electronic signature before deployment to prevent counterfeit substitution. Use Value: 2000 V ESD rating ensures integrity during service technician handling; OTP prevents accidental corruption during power cycling. |
| Automotive Body Control Modules (BCM) | Avionics Maintenance Test Equipment |
Use Scenario: Storing vehicle-specific lighting logic and CAN message routing tables in BCMs deployed in under-hood environments with wide thermal cycling. IC Role / Device Role / Timing Role: Read-only memory for static control algorithms; interfaced directly to 8-bit MCU without glue logic. Use Value: –40 to +85 °C operating range matches automotive Grade 3 requirements; PLCC32 package resists mechanical shock during vibration testing. |
Use Scenario: Embedded firmware storage in portable avionics ground-test sets requiring traceable, tamper-proof software images compliant with DO-178B Level C. IC Role / Device Role / Timing Role: Immutable firmware image loaded at factory; verified post-programming using margin-mode read at 5 V to confirm cell threshold margins. Use Value: Margin-mode capability provides design assurance beyond standard read verification - critical for safety-critical tool certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-120DC | 5 V-only operation (no 2.7–3.6 V read), 120 ns access, PDIP32 package | Requires level-shifting in 3.3 V systems; higher active current (30 mA) | Select only if legacy 5 V infrastructure exists and PLCC32 footprint is not required |
| M27C512-10F1 | Same pinout and signature, but UV-erasable EPROM (not OTP); requires quartz window and UV eraser | Supports field reprogramming; incompatible with sealed enclosures or automated programming lines | Choose only when firmware updates are anticipated and physical access for UV exposure is guaranteed |
Compared with M27W512-100K6, AM27C512-120DC lacks low-voltage operation and increases system power budget, while M27C512-10F1 introduces erasure logistics and reliability risks from repeated UV exposure - making M27W512-100K6 optimal for sealed, battery-powered, or safety-certified deployments where firmware immutability is mandatory.
Availability
M27W512-100K6 is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical instruments, automotive body control modules, and avionics test equipment requiring stable component supply across extended product lifecycles.
Supply support for M27W512-100K6 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, specializing in automotive, industrial, and power management ICs with strong heritage in nonvolatile memory design.
The M27W512 belongs to ST's legacy OTP EPROM product line, engineered specifically for cost-sensitive, high-reliability embedded systems where firmware permanence, low-voltage operation, and industrial temperature tolerance are mandatory.
FAQ
Can M27W512-100K6 be reprogrammed after initial programming?
No. The M27W512-100K6 is a one-time programmable EPROM: once a bit is programmed from '1' to '0', it cannot be reverted. There is no erase mechanism - UV light has no effect, and electrical erasure is not supported. Programming is irreversible by design, ensuring firmware integrity in safety-critical or tamper-resistant applications.
What is the role of GVPP pin during read operation?
During read operation, GVPP functions solely as Output Enable (G). It must be driven low to enable Q0–Q7 outputs; when high, outputs go high-impedance regardless of E state. GVPP is not used as a voltage supply in read mode - VPP pin remains unconnected or grounded, and only VCC (2.7–3.6 V) powers the device.
Is M27W512-100K6 pin-compatible with M27C512 in all modes?
Yes - M27W512-100K6 is fully pin- and function-compatible with M27C512 in read, standby, and electronic signature modes. Both share identical PLCC32 pinout, signal names, timing parameters, and manufacturer/device codes (20h/3Dh). However, M27W512 uses lower VCC (6.25 V) for programming versus M27C512's 6.5 V, requiring minor programmer voltage adjustment.
Why does the datasheet specify A9 = 12 V for Electronic Signature but not for normal operation?
A9 is used exclusively as a high-voltage trigger (11.5–12.5 V) to activate Electronic Signature mode - a dedicated test function that outputs manufacturer and device codes on Q7–Q0. During normal read or programming, A9 operates at standard TTL levels (0–3.6 V or 0–6.25 V) and carries no special function; the 12 V condition is isolated to signature verification and never applied in system operation.
M27W512-100K6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 100 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (11.35x13.89)
M27W512-100K6 FAQ
1.How can I place an order for M27W512-100K6 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27W512-100K6 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 M27W512-100K6 reliable?
The price and inventory of M27W512-100K6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27W512-100K6 is usually 5 days.
3.What payment methods are accepted for M27W512-100K6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27W512-100K6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27W512-100K6?
M27W512-100K6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27W512-100K6 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 M27W512-100K6?
For technical support, including M27W512-100K6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27W512-100K6 requirements.
6.How does Aetrix verify that M27W512-100K6 is sourced from the original manufacturer or authorized distributors?
All M27W512-100K6 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 M27W512-100K6 meets industry standards.
7.What is the process for return or replacement of M27W512-100K6?
All M27W512-100K6 units undergo pre-shipment inspection (PSI). If there is an issue with M27W512-100K6, 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 M27W512-100K6 part is unused and in its original packaging.
Return procedure for M27W512-100K6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M27W512-100K6 Tags
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M24C02-WMN6TP
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