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STMicroelectronics M27C4001-35XF1
- Part No.:
- M27C4001-35XF1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C4001-35XF1.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
M27C4001-35XF1 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in FDIP32W ceramic window package, featuring 35 ns access time, 5 V ±10% read supply, 12.75 V ±0.25 V programming voltage, and dual-line output control (E/G) for low-power memory arrays in legacy microprocessor systems.
For engineers reviewing the M27C4001-35XF1 datasheet, M27C4001-35XF1 pinout, M27C4001-35XF1 application, or M27C4001-35XF1 equivalent, this device serves as a verified UV-erasable program storage solution requiring precise timing control, TTL-compatible interfacing, and ultraviolet erasure infrastructure - critical for industrial controller firmware updates, boot ROMs in embedded instrumentation, and legacy system reprogramming workflows.
Technical Context
The M27C4001-35XF1 implements a standard NMOS EPROM architecture with address latch and sense amplifier array, supporting three primary operational modes: Read (E=G=L), Standby (E=H), and Programming (VPP=12.75 V, E pulsed L, G=H). Its two-line output enable logic decouples chip selection from data gating to eliminate bus contention in multi-device memory maps.
It features PRESTO II programming algorithm with 100 µs/word pulses and automatic margin verify, plus Electronic Signature mode (A9=12 V, A0 toggled) returning Manufacturer Code 20h and Device Code 41h. Erasure requires ≥15 W·sec/cm² UV dose at 2537 Å wavelength through its quartz window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 4 Mbit organized as 524,288 × 8 bits - supports full 19-bit address space for 8-bit microprocessor buses. |
| Access Time | 35 ns max (tAVQV) - enables direct interface with 20–25 MHz CPU buses without wait states. |
| Read Supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no separate I/O voltage required. |
| Programming Voltage | 12.75 V ±0.25 V on VPP - mandates dedicated high-voltage programming circuitry; not compatible with 5 V-only programmers. |
| Standby Current | 100 µA (CMOS E input) - reduces power in idle memory banks during multi-chip decode schemes. |
| Package Type | FDIP32W - ceramic dual-in-line with UV-transparent quartz window for field erasure. |
| Electronic Signature | Manufacturer Code 20h, Device Code 41h - enables automated programmer identification and algorithm selection. |
Pinout & Package
FDIP32W is a 32-pin ceramic frit-seal DIP with UV-transparent window, 0.6-inch width, and 0.1-inch lead pitch. Pin 1 marked by notch; leads are tin-lead solderable per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; all must be stable before E or G assertion for valid read. |
| Q0–Q7 | Data Outputs | Bi-directional during programming (data-in); high-impedance when E=H or G=H. |
| E | Chip Enable | Primary device select; CMOS/TTL-compatible active-low; controls standby current state. |
| G | Output Enable | Secondary output gate; active-low; allows shared G-bus across multiple EPROMs without contention. |
| VPP | Programming Supply | 12.75 V input only during programming/verify; must be applied after VCC and removed before VCC. |
| VCC | Supply Voltage | 5 V ±10% for read; 6.25 V ±0.25% for programming - strict sequencing required. |
| VSS | Ground | Reference for all signals; requires local 0.1 µF ceramic decoupling per device. |
| A9 | Electronic Signature Control | 12 V input (11.5–12.5 V) enables signature read mode; not used in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line output control (E/G) | Enables zero-power deselection of unaddressed devices in memory arrays while keeping outputs Hi-Z. |
| PRESTO II programming algorithm | Guarantees cell margin via MARGIN MODE verify - eliminates over-programming and extends endurance. |
| UV erasability via FDIP32W window | Supports >100 erase/write cycles with proper 2537 Å UV exposure (15–20 min at 12 mW/cm²). |
| Electronic Signature (20h/41h) | Allows auto-detection by universal programmers - prevents mismatched algorithms and programming failures. |
| ECOPACK® compliance | Lead-free construction with JEDEC JESD97 second-level interconnect marking - meets RoHS requirements. |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Storing firmware for programmable logic controllers operating in factory-floor environments with temperature cycling and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile boot code storage accessed at power-on reset; sequenced via 80C88/80C86 address/data bus with 35 ns tACC timing constraint. Use Value: Quartz-window FDIP32W allows on-site firmware revision via UV erasure without board removal - reducing maintenance downtime. | Use Scenario: Holding self-test routines and calibration constants in automated test systems deployed since the 1990s. IC Role / Device Role / Timing Role: Static program memory mapped to fixed address space; enabled by decoded E signal and gated by system READ line on G. Use Value: 100 µA standby current minimizes cumulative power draw across multi-EPROM memory banks during idle test phases. |
| Avionics Maintenance Diagnostic Module | Medical Imaging System BIOS |
Use Scenario: Storing diagnostic microcode in airborne line-replaceable units subject to DO-254 design assurance level B. IC Role / Device Role / Timing Role: Read-only configuration store accessed during BIT (Built-In Test); timing-critical due to deterministic execution windows. Use Value: 35 ns access time ensures deterministic fetch latency under worst-case voltage/temperature conditions (-40°C to +85°C). | Use Scenario: Holding initialization firmware for X-ray detector control subsystems requiring traceable, immutable boot code. IC Role / Device Role / Timing Role: OTP-capable EPROM used as write-once BIOS; FDIP32W variant selected for reprogrammability during R&D and qualification. Use Value: Electronic Signature (20h/41h) enables automated verification during production programming - preventing counterfeit or mislabeled parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UV-erasable EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4001-35DC | 35 ns access, same 4 Mbit organization, but in PDIP32 (no UV window); requires pre-programmed delivery. | Used where field erasure is unnecessary and cost-sensitive volume production favors plastic packaging. | Select when firmware is finalized and UV reprogramming capability is not required. |
| MX27C4001-35PC | 35 ns access, pin-compatible, but uses different programming algorithm and lacks Electronic Signature (20h/41h). | Requires custom programmer configuration; not auto-recognized by ST-compliant tools. | Select only if existing toolchain supports MX27C-specific verify sequences and margin testing. |
Compared with AM27C4001-35DC and MX27C4001-35PC, the M27C4001-35XF1 uniquely combines field-erasable capability, standardized Electronic Signature, and ECOPACK® compliance - making it the sole choice for applications demanding post-deployment firmware updates, automated programming validation, and RoHS-conforming legacy designs.
Availability
M27C4001-35XF1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROMs, and avionics diagnostic modules requiring stable component supply across extended product lifecycles.
Supply support for M27C4001-35XF1 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 technologies with broad analog and microcontroller portfolios.
The M27C4001 belongs to ST's legacy EPROM product line, designed specifically for reliable, long-lifecycle nonvolatile storage in microprocessor-based systems where field-upgradable firmware and deterministic timing are essential.
FAQ
What UV wavelength and exposure time are required to fully erase the M27C4001-35XF1?
Full erasure requires short-wave ultraviolet light at 2537 Å wavelength with a minimum integrated dose of 15 W·sec/cm². Using a standard 12 mW/cm² UV lamp, place the device within 2.5 cm of the source for 15–20 minutes. Room fluorescent lighting may cause partial erasure over years; direct sunlight can erase in ~1 week.
Can the M27C4001-35XF1 be programmed using a 5 V-only programmer?
No. Programming requires VPP = 12.75 V ±0.25 V applied to the VPP pin, with VCC = 6.25 V ±0.25 V during pulse application. A 5 V-only programmer cannot meet these voltage requirements and will fail to alter memory cells. Dedicated EPROM programmers with high-voltage generation are mandatory.
Is the FDIP32W package RoHS compliant?
Yes. The M27C4001-35XF1 in FDIP32W is ECOPACK®-compliant and lead-free, meeting RoHS Directive 2011/65/EU. JEDEC JESD97 second-level interconnect marking is present on both package and inner box label, confirming compliance with environmental standards.
How does the two-line output control (E and G) reduce power in memory arrays?
When E = VIH, the device enters standby mode drawing only 100 µA, regardless of G state. G remains active only for selected devices, allowing shared G-bus across multiple EPROMs. This ensures deselected chips consume near-zero active power while avoiding output bus contention - critical for dense memory maps.
M27C4001-35XF1 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:
- 35 ns
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-CDIP Frit Seal with Window
M27C4001-35XF1 FAQ
1.How can I place an order for M27C4001-35XF1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4001-35XF1 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 M27C4001-35XF1 reliable?
The price and inventory of M27C4001-35XF1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-35XF1 is usually 5 days.
3.What payment methods are accepted for M27C4001-35XF1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-35XF1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4001-35XF1?
M27C4001-35XF1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4001-35XF1 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 M27C4001-35XF1?
For technical support, including M27C4001-35XF1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-35XF1 requirements.
6.How does Aetrix verify that M27C4001-35XF1 is sourced from the original manufacturer or authorized distributors?
All M27C4001-35XF1 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 M27C4001-35XF1 meets industry standards.
7.What is the process for return or replacement of M27C4001-35XF1?
All M27C4001-35XF1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-35XF1, 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 M27C4001-35XF1 part is unused and in its original packaging.
Return procedure for M27C4001-35XF1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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