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STMicroelectronics M27C4001-12F1
- Part No.:
- M27C4001-12F1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C4001-12F1.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,335
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Product details
Overview
M27C4001-12F1 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in FDIP32W ceramic window package, operating at 5V ±10%, with 35ns access time, 30mA active current, and 100µA standby current. It supports TTL-level addressing and data I/O, features two-line output control (E and G), and is used for firmware storage in legacy microprocessor systems requiring nonvolatile, field-erasable program memory.
For engineers reviewing the M27C4001-12F1 datasheet, M27C4001-12F1 pinout, M27C4001-12F1 application, or M27C4001-12F1 equivalent, key selection criteria include UV erasability, 12.75V programming voltage, PRESTO II algorithm compatibility, electronic signature (20h/41h), and FDIP32W mechanical compatibility with UV exposure fixtures.
Technical Context
The M27C4001-12F1 implements a classic NMOS-derived EPROM architecture with dual-control read enable (E for chip select, G for output gating), enabling low-power array partitioning. Its logic diagram confirms full address decoding across A0–A18 and parallel Q0–Q7 data bus operation without internal latching or timing state machines.
Programming requires precise 12.75V ±0.25V on VPP, 6.25V ±0.25V on VCC, and 100µs pulse width per word; verify uses identical VPP but with VCC = 6.25V and E = VIH/G = VIL. Electronic signature mode activates via 11.5–12.5V on A9 while VPP = VCC = 5V, returning manufacturer code 20h and device code 41h on Q7–Q0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (524,288 × 8 bits); supports full 19-bit address space for legacy 8-bit microprocessor boot ROMs. |
| Access Time | 35 ns (tAVQV, tELQV); meets timing requirements of 20–25 MHz Z80, 68000, and 8086-based systems in read mode. |
| Supply Voltage (Read) | 5 V ±10%; compatible with standard TTL/CMOS logic rails without regulation overhead. |
| Standby Current | 100 µA (CMOS E high); enables low-quiescent power in battery-backed or intermittent-read embedded controllers. |
| Programming Voltage | 12.75 V ±0.25 V on VPP; requires dedicated EPROM programmer with regulated high-voltage supply and pulse control. |
| Electronic Signature | Manufacturer Code 20h, Device Code 41h; enables automatic algorithm selection in universal programmers (e.g., Dataman, Xeltek). |
| UV Erase Dose | ≥15 W·s/cm² at 2537 Å; achieved in 15–20 min at 12,000 µW/cm² intensity within 2.5 cm lamp distance. |
Pinout & Package
FDIP32W: 32-pin ceramic dual in-line package with UV-transparent quartz window; frit-sealed, ECOPACK® compliant (lead-free), 0.6 inch width, 0.3 inch height, 0.1 inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus; fully decoded to select one of 524,288 bytes; TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| Q0–Q7 | Data Outputs | 8-bit bidirectional data bus during programming (data-in) and read (data-out); outputs Hi-Z when E or G inactive. |
| E | Chip Enable | Primary device selection; CMOS/TTL-compatible; VIH > VCC – 0.2 V places device in standby (100 µA ICC2). |
| G | Output Enable | Secondary output gating; independent of E; allows shared G-bus across memory arrays to prevent bus contention. |
| VPP | Programming Supply | 12.75 V ±0.25 V input required only during programming/verify; must be applied after or simultaneously with VCC. |
| VCC | Supply Voltage | 5 V ±10% for read; 6.25 V ±0.25% for programming; decoupling requires 0.1 µF ceramic + 4.7 µF bulk per 8 devices. |
| VSS | Ground | Reference return for all signals; must be low-inductance connection to minimize transient noise during E/G transitions. |
| A9 (ES) | Electronic Signature Control | Receives 11.5–12.5 V during signature read; not used in normal operation; requires isolation from system address bus. |
Key Features
| Feature | Design Value |
|---|---|
| Two-Line Output Control (E + G) | Enables hierarchical memory array design: E selects individual devices into low-power standby, G gates outputs globally-eliminating bus contention and reducing system-level power by >95% vs single-enable schemes. |
| PRESTO II Programming Algorithm | Guarantees cell margin via automatic MARGIN MODE verify at two VCC levels (6 V and 4.2 V); eliminates overprogramming risk and ensures >10-year data retention without iterative pulse tuning. |
| ECOPACK® Compliance | Lead-free ceramic package meeting JEDEC JESD97 second-level interconnect marking; supports RoHS-compliant legacy system rework and repair without Pb-based solder concerns. |
| UV Erase Window Integration | Hermetically sealed quartz window in FDIP32W allows full die exposure; enables unlimited reprogramming cycles in field-deployed equipment where OTP alternatives would require hardware replacement. |
Applications
| Industrial PLC Firmware Storage | Avionics Boot ROM |
|---|---|
|
Use Scenario: Storing fixed startup firmware for programmable logic controllers operating in temperature-stable cabinet environments with scheduled maintenance windows. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed during cold start with strict 35 ns tACC timing compliance. Use Value: UV erasability allows firmware updates during depot-level servicing without PCB replacement; FDIP32W window enables verification of erase completeness before reprogramming. |
Use Scenario: Holding certified flight-critical boot code in airborne computing modules subject to DO-254 design assurance level A/B. IC Role / Device Role / Timing Role: Read-only instruction store executing immediately post-power-on; timing validated under –40°C to +85°C per Table 9 AC specs. Use Value: Electronic signature (20h/41h) provides traceable device origin for configuration management; ECOPACK® marking satisfies airworthiness material documentation requirements. |
| Medical Imaging System BIOS | Test Equipment Calibration Data |
|
Use Scenario: Storing diagnostic self-test routines and hardware initialization sequences in FDA-regulated MRI and CT scanner subsystems. IC Role / Device Role / Timing Role: Memory-mapped ROM accessed by dedicated microcontroller during power-up sequence; requires guaranteed 100 µA standby current for low-noise analog section isolation. Use Value: Dual standby modes (TTL/CMOS E input) allow seamless integration with mixed-signal controller I/O; UV window permits post-manufacturing calibration patching. |
Use Scenario: Retaining factory-trimmed calibration coefficients and sensor linearization tables in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Static data repository read once per instrument power cycle; accessed via parallel bus with no dynamic write cycles during operation. Use Value: 12.75 V VPP programming voltage ensures immunity to accidental writes from 5 V system rails; PRESTO II margin verify guarantees coefficient integrity over 15+ year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM firmware storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4001-12DC | Same 4 Mbit organization, 35 ns access, but uses AMD's proprietary programming algorithm and signature codes (01h/41h); requires AMD-specific programmer support. | Compatible pinout and DC specs, but lacks ST's PRESTO II margin verify; higher risk of marginal programming in high-temp environments. | Select only if existing AMD-programmer infrastructure is in place; avoid for new designs requiring long-term algorithm stability. |
| MX27C4001-12PC | Macronix variant with identical FDIP32W package and 35 ns speed grade, but specifies 12.5 V ±0.5 V VPP and different electronic signature (C2h/41h). | Valid for UV-erasable boot ROM use, but requires separate signature detection logic in automated test handlers. | Acceptable for cost-sensitive replacements where ST's ECOPACK® compliance is not mandated; verify UV erase uniformity per lot. |
Compared with AM27C4001-12DC and MX27C4001-12PC, the M27C4001-12F1 offers superior programming margin assurance via PRESTO II, tighter VPP tolerance (±0.25 V), and documented ECOPACK® lead-free compliance-critical for medical and industrial OEMs managing extended-lifecycle BOMs.
Availability
M27C4001-12F1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, avionics boot ROM, and medical imaging system BIOS requiring stable component supply across multi-year production runs and field-service reprogramming cycles.
Supply support for M27C4001-12F1 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, specializing in automotive, industrial, and power discrete solutions with strong heritage in nonvolatile memory design.
The M27C4001 belongs to ST's legacy EPROM product line, engineered specifically for high-reliability, field-erasable firmware storage in microprocessor-based systems where data integrity, UV reprogrammability, and long-term obsolescence management are primary design constraints.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C4001-12F1?
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 at 2.5 cm distance, erasure completes in 15–20 minutes. Room fluorescent lighting may cause partial erasure over ~3 years; direct sunlight induces erasure in ~1 week.
Can the M27C4001-12F1 be programmed using standard 5 V system logic levels?
No. Programming requires 12.75 V ±0.25 V on VPP and 6.25 V ±0.25 V on VCC-both outside standard 5 V logic rails. Address and data lines remain TTL-compatible (0–5 V), but dedicated high-voltage programming hardware with pulse control and sequencing is mandatory.
Is the FDIP32W package of the M27C4001-12F1 compatible with modern surface-mount reflow processes?
No. The FDIP32W is a through-hole ceramic DIP with frit-sealed leads and UV window; it is incompatible with SMT reflow. It is designed for socketed insertion or wave soldering. ST does not offer an SMT-compatible variant of this part number.
How does the two-line output control (E and G) reduce power in memory arrays?
E (chip enable) places deselected devices into 100 µA standby mode, cutting active current by >99%. G (output enable) keeps outputs Hi-Z across all devices until data is needed, eliminating bus contention and associated shoot-through currents. This hierarchical control reduces total array power by up to 97% versus single-enable architectures.
M27C4001-12F1 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-CDIP Frit Seal with Window
M27C4001-12F1 FAQ
1.How can I place an order for M27C4001-12F1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-12F1 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 M27C4001-12F1 reliable?
The price and inventory of M27C4001-12F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-12F1 is usually 5 days.
3.What payment methods are accepted for M27C4001-12F1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-12F1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-12F1?
M27C4001-12F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-12F1 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 M27C4001-12F1?
For technical support, including M27C4001-12F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-12F1 requirements.
6.How does Aetrix verify that M27C4001-12F1 is sourced from the original manufacturer or authorized distributors?
All M27C4001-12F1 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 M27C4001-12F1 meets industry standards.
7.What is the process for return or replacement of M27C4001-12F1?
All M27C4001-12F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-12F1, 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 M27C4001-12F1 part is unused and in its original packaging.
Return procedure for M27C4001-12F1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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