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STMicroelectronics M27C4001-12F6
- Part No.:
- M27C4001-12F6
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C4001-12F6.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
M27C4001-12F6 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in FDIP32W ceramic frit-seal window package, operating at 5V ±10%, with 35ns access time, 30mA active current, and 100µA standby current. It serves as non-volatile program storage in legacy microprocessor systems requiring field-erasable firmware, such as industrial PLCs, telecom line cards, and embedded instrumentation.
For engineers reviewing the M27C4001-12F6 datasheet, M27C4001-12F6 pinout, M27C4001-12F6 application, or M27C4001-12F6 equivalent, key selection criteria include UV erasability, two-line output control (E/G), TTL-compatible I/O, 12.75V programming voltage, and ECOPACK®-compliant lead-free packaging for legacy system maintenance and reprogramming.
Technical Context
The M27C4001-12F6 implements a classic NMOS EPROM architecture with dual-control read enable (E = chip select, G = output gate), supporting high-impedance outputs during standby and bus contention avoidance in multi-chip memory arrays. Its logic diagram confirms full address decoding across A0–A18 and parallel 8-bit data I/O on Q0–Q7.
Programming uses the PRESTO II algorithm with 100µs/word pulses at VPP = 12.75V ±0.25V and VCC = 6.25V ±0.25V; verify occurs under same VPP with VCC = 6V or 4.2V to confirm margin. Electronic signature mode reads Manufacturer Code 20h and Device Code 41h via A9 = 12V and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8 bits) - supports full 19-bit addressing for 512KB firmware images |
| Access Time | 35 ns - enables direct interface with 20–25 MHz microprocessors without wait states |
| Supply Voltage (Read) | 5 V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system power |
| Standby Current | 100 µA - reduces idle power in battery-backed or low-power maintenance modes |
| Programming Voltage | 12.75 V ±0.25 V - requires dedicated HV supply; not compatible with standard 5V-only programmers |
| Package Type | FDIP32W - ceramic DIP with UV-transparent window for field erasure using 2537 Å lamps |
| ECOPACK® Compliant | Yes - lead-free construction per JEDEC JESD97, marked on package and inner box label |
Pinout & Package
FDIP32W is a 32-pin ceramic dual in-line package with UV-transparent quartz window, 0.6-inch body width, and frit-seal hermetic construction rated for industrial temperature range (–40°C to +85°C). Pin numbering follows standard DIP convention with Pin 1 at top-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus; fully decoded to select one of 524,288 bytes |
| Q0–Q7 | Data Outputs | Bi-directional data bus in programming mode; outputs only in read/verify |
| E | Chip Enable | Active-low primary device select; places device in standby when high |
| G | Output Enable | Active-low output gate; controls data bus drive independent of E state |
| VPP | Programming Supply | 12.75V input required only during programming/verify; must be applied after VCC |
| VCC | Power Supply | 5V for read; 6.25V for programming - strict sequencing required vs. VPP |
| VSS | Ground | Reference return for all signals; decoupling requires 0.1µF ceramic per device |
| A9 (ES) | Electronic Signature Input | 12V input during signature read to identify ST (20h) and M27C4001 (41h) |
Key Features
| Feature | Design Value |
|---|---|
| Two-Line Output Control (E + G) | Enables zero-bus-contention memory expansion: E selects device into low-power standby, G gates outputs only when data is needed |
| PRESTO II Programming Algorithm | Guarantees cell margin without over-programming; verifies each byte at two VCC levels (6V/4.2V) for long-term data retention |
| UV Erasability (FDIP32W) | Full array erase in 15–20 min using 2537 Å UV lamp at ≥15 W·sec/cm² dose; window allows field reprogramming |
| Electronic Signature | Hardware-level device identification (20h/41h) for automated programmer compatibility and BOM validation |
| ECOPACK® Lead-Free Packaging | Meets RoHS and JEDEC JESD97 interconnect category labeling; no lead content in solderable terminations |
Applications
| Industrial PLC Firmware Storage | Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing ladder logic firmware in programmable logic controllers deployed in factory automation environments with infrequent updates but long service life. IC Role / Device Role / Timing Role: Non-volatile boot memory holding executable code executed directly by Z80 or 80C88 CPU upon power-up; accessed at 20 MHz with 35ns tACC. Use Value: UV erasability allows field firmware patching without board removal; FDIP32W window enables in-situ erasure using portable UV lamps. | Use Scenario: Holding initialization code and protocol stacks for T1/E1 line interface cards in central office switches where firmware rarely changes but must survive decades. IC Role / Device Role / Timing Role: Read-only instruction memory mapped to CPU address space; selected via E signal synchronized to system clock, with G tied to RD#. Use Value: 100µA standby current minimizes thermal load in densely packed line card chassis; ECOPACK® compliance ensures legacy replacement availability. |
| Embedded Instrumentation Calibration Data | Legacy Medical Device Bootloader |
Use Scenario: Storing sensor calibration coefficients and linearization tables in benchtop oscilloscopes and spectrum analyzers requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Static data repository accessed during power-on self-test; read once at startup, then held in cache; E asserted continuously, G pulsed per byte. Use Value: Two-line control prevents bus conflicts during concurrent access to RAM and EPROM; TTL-compatible outputs interface directly with 74LS logic. | Use Scenario: Hosting secure bootloader code in FDA-cleared patient monitoring devices where firmware integrity and long-term obsolescence management are critical. IC Role / Device Role / Timing Role: First-stage boot memory verified at power-up before loading application firmware from flash; operates in industrial temperature range (–40°C to +85°C). Use Value: Hermetic FDIP32W package ensures >20-year data retention; electronic signature (20h/41h) validates authentic ST silicon during production test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM-based firmware storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4001-12DC | Same 4Mbit UV EPROM, 35ns access, but in PDIP32 (no UV window); requires pre-erased chips or external UV chamber | Not field-erasable; suited for high-volume production where erasure occurs off-board prior to assembly | Select when UV window is unnecessary and cost-sensitive PDIP packaging is preferred |
| M27C4002-12F6 | Pin-compatible upgrade with 8 Mbit density (1024K × 8); identical FDIP32W package and timing; requires same 12.75V VPP | Provides double firmware capacity without PCB redesign; maintains same UV erasure workflow and socket footprint | Select when future firmware growth is anticipated and board layout cannot be modified |
Compared with AM27C4001-12DC, M27C4001-12F6 enables true field reprogramming; compared with M27C4002-12F6, it offers proven reliability at lower density for cost-constrained legacy systems where 4Mbit remains sufficient.
Availability
M27C4001-12F6 is available at Aetrix Electronics and suitable for industrial PLC firmware updates, telecom line card reconfiguration, and embedded instrumentation calibration data storage requiring stable component supply across extended product lifecycles.
Supply support for M27C4001-12F6 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, MCU, power, and memory products for industrial, automotive, and consumer markets.
The M27C4001 belongs to ST's legacy EPROM product line, engineered specifically for reliable, field-erasable non-volatile storage in microprocessor-based systems where firmware updates occur infrequently but must be performed without board replacement.
FAQ
What UV wavelength and exposure time are required to erase M27C4001-12F6?
The M27C4001-12F6 requires short-wave ultraviolet light at 2537 Å wavelength. Erasure needs a minimum integrated dose of 15 W·sec/cm² - achieved in 15–20 minutes using a 12,000 µW/cm² lamp with the device placed within 2.5 cm of the tube. Fluorescent lighting causes slow erasure (~3 years), so opaque labels are recommended for long-term storage.
Can M27C4001-12F6 be programmed with a standard 5V-only EPROM programmer?
No. Programming requires VPP = 12.75V ±0.25V and VCC = 6.25V ±0.25V simultaneously, with strict power sequencing (VCC applied before VPP and removed after). Standard 5V-only programmers lack the necessary high-voltage supply and dual-rail capability, risking incomplete programming or device damage.
Is the FDIP32W package RoHS-compliant?
Yes. The M27C4001-12F6 FDIP32W package is ECOPACK®-compliant and lead-free, meeting RoHS Directive 2011/65/EU. JEDEC JESD97 second-level interconnect category marking appears on both the package and inner box label, confirming compliance with environmental standards for legacy component reuse.
How does the two-line output control (E and G) prevent bus contention in multi-EPROM systems?
E (Chip Enable) places deselected devices in standby mode (100µA, outputs high-Z), while G (Output Enable) independently gates outputs of selected devices. This ensures only one EPROM drives the data bus at any time - even if multiple devices share address/data lines - eliminating contention and reducing system noise and power spikes during memory access.
M27C4001-12F6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 32-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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-CDIP Frit Seal with Window
M27C4001-12F6 FAQ
1.How can I place an order for M27C4001-12F6 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-12F6 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 M27C4001-12F6 reliable?
The price and inventory of M27C4001-12F6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-12F6 is usually 5 days.
3.What payment methods are accepted for M27C4001-12F6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-12F6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-12F6?
M27C4001-12F6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-12F6 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 M27C4001-12F6?
For technical support, including M27C4001-12F6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-12F6 requirements.
6.How does Aetrix verify that M27C4001-12F6 is sourced from the original manufacturer or authorized distributors?
All M27C4001-12F6 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 M27C4001-12F6 meets industry standards.
7.What is the process for return or replacement of M27C4001-12F6?
All M27C4001-12F6 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-12F6, 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 M27C4001-12F6 part is unused and in its original packaging.
Return procedure for M27C4001-12F6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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