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STMicroelectronics M27C4002-45XF1
- Part No.:
- M27C4002-45XF1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 40-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
M27C4002-45XF1.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
M27C4002-45XF1 from STMicroelectronics is a 4 Mbit (256K × 16) UV-erasable EPROM in FDIP40W ceramic window package, supporting 5V ±10% read operation, 45ns access time, and 12.75V ±0.25V programming voltage. It features two-line output control (E/G), electronic signature (20h/44h), and is used in legacy microprocessor boot ROMs, industrial controller firmware storage, and embedded system BIOS retention where field erasure via UV light is required.
For engineers reviewing the M27C4002-45XF1 datasheet, M27C4002-45XF1 pinout, M27C4002-45XF1 application, or M27C4002-45XF1 equivalent, key selection criteria include UV-erasability, 40-pin DIP window package compatibility, TTL-level address/data interface, 45ns read timing, and PRESTO II programming algorithm support - all critical for maintaining legacy system reprogrammability and long-term firmware lifecycle management.
Technical Context
The M27C4002-45XF1 implements a parallel-addressed, asynchronous EPROM architecture with dual active-low control lines: Chip Enable (E) governs power state and device selection, while Output Enable (G) independently gates data onto Q0–Q15 outputs. Its logic diagram confirms full 18-bit address decoding (A0–A17) and 16-bit bidirectional data bus operation during programming.
It supports five distinct operating modes - Read, Standby, Program, Verify, and Electronic Signature - each defined by specific voltage and timing conditions on E, G, VPP, and A9. Programming requires VCC = 6.25V ±0.25V and VPP = 12.75V ±0.25V, with 100µs/word pulses and automatic margin verification via PRESTO II algorithm, ensuring reliable cell threshold stability without overprogramming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (262,144 × 16 bits); enables full 32KB firmware image storage for 8/16-bit microcontrollers. |
| Access Time | 45 ns (tAVQV, tELQV); ensures compatibility with 10 MHz Z80, 8086, and 68000-based systems without wait states. |
| Read Supply | 5 V ±10%; operates directly from standard logic rail without regulation overhead. |
| Programming Voltage | VPP = 12.75 V ±0.25 V; requires dedicated high-voltage supply but avoids external charge pumps. |
| Standby Current | 100 µA (CMOS E-high); reduces idle power in battery-backed or low-power industrial controllers. |
| Electronic Signature | Manufacturer Code 20h, Device Code 44h on Q7–Q0; enables automated programmer identification and algorithm matching. |
| UV Erase Dose | ≥15 W·s/cm² at 2537 Å; achieves full bit reset in 15–20 min under standard UV lamps at 1-inch distance. |
Pinout & Package
FDIP40W: 40-pin ceramic dual in-line package with UV-transparent quartz window for erasure; frit-sealed, hermetic, rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit parallel address bus; fully decodes 256K-word space; TTL-compatible inputs. |
| Q0–Q15 | Data Outputs / Inputs | 16-bit bidirectional data path; outputs valid during Read/Verify, inputs latched during Programming. |
| E | Chip Enable | Active-low primary device select; places device in Standby (100 µA) when high; enables programming when pulsed low. |
| G | Output Enable | Active-low output gate; controls Q0–Q15 drive independent of E; prevents bus contention in multi-chip arrays. |
| VPP | Programming Supply | 12.75 V input enabling Fowler-Nordheim tunneling; must be stable before and after VCC during programming. |
| VCC | Supply Voltage | 5 V for Read/Standby; 6.25 V for Programming; requires local 0.1 µF ceramic decoupling. |
| VSS | Ground | Two dedicated pins (pins 20 & 40) reduce ground bounce in high-speed read cycles. |
| A9 (ES) | Electronic Signature Control | Receives 11.5–12.5 V for manufacturer/device ID readout; not used in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| UV-Erasable Architecture | Quartz window enables >100 erase/write cycles with verified 15–20 min UV exposure; essential for firmware development and field updates. |
| Two-Line Output Control (E/G) | Separates power gating (E) from output enable (G), eliminating bus contention in multi-EPROM memory maps and reducing system-level glue logic. |
| PRESTO II Programming Algorithm | Automated 100 µs pulse sequencing with margin-mode verify ensures consistent programming across temperature and process variation - no manual tuning required. |
| Electronic Signature (20h/44h) | Hardware-level device identification on Q7–Q0 allows universal programmers to auto-select correct voltage/timing profiles without user configuration. |
| ECOPACK® Compliance | Lead-free ceramic package meets JEDEC JESD97 second-level interconnect marking; supports RoHS-compliant legacy system refurbishment. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Fixed-function programmable logic controllers require non-volatile, field-upgradable firmware that survives power loss and operates across –25°C to +70°C ambient. IC Role / Device Role / Timing Role: Primary boot memory holding initialization code and ladder logic interpreter; accessed at power-on reset with 45ns timing guarantee. Use Value: UV erasability allows factory reprogramming and field firmware patches using standard UV chambers; FDIP40W package withstands industrial vibration and thermal cycling. |
Use Scenario: Vintage 8086/80286-based test equipment relies on unbuffered EPROM for cold-start execution without external memory controllers. IC Role / Device Role / Timing Role: Directly mapped into CPU address space as 00000h–07FFFh; driven by synchronous address strobes and TTL-level control signals. Use Value: 5V-only read operation and 45ns access eliminate need for level shifters or wait-state generators - preserving original board timing integrity. |
| Avionics Maintenance Terminal BIOS | Medical Device Calibration Data Archive |
|
Use Scenario: Ground-support avionics terminals store aircraft-specific configuration and diagnostic routines requiring long-term data retention (>10 years) and traceable revision control. IC Role / Device Role / Timing Role: Non-volatile BIOS image storage; erased and reprogrammed only during depot-level maintenance using calibrated UV exposure. Use Value: Hermetic FDIP40W package prevents moisture ingress and ion migration; ECOPACK® marking satisfies aerospace material traceability requirements. |
Use Scenario: Class II medical infusion pumps retain calibration coefficients and safety-critical operational parameters across battery swaps and power interruptions. IC Role / Device Role / Timing Role: Read-only data archive mapped to fixed memory region; accessed during startup self-test and parameter validation routines. Use Value: 100 µA standby current extends backup battery life; UV erasure provides auditable, irreversible data reset prior to recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UV-erasable EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C400-45DC | 4 Mbit (256K×16), 45ns, 5V read, 12.5V program; PDIP40 package without UV window; OTP-only. | Cannot be UV-erased - suitable only for one-time firmware deployment where field updates are unnecessary. | Select only if system design eliminates need for reprogramming and prioritizes lower cost over erasability. |
| M27C4001-45XN6TR | 4 Mbit (256K×16), 45ns, TSOP40 (10×20 mm), lead-free; UV-erasable but requires quartz-lid TSOP variant (not standard). | Surface-mount footprint reduces PCB area but lacks standardized UV exposure geometry; erasure uniformity not guaranteed. | Choose only for space-constrained designs with custom UV fixture and validated erasure protocol. |
Compared with M27C4002-45XF1, AM27C400-45DC sacrifices field reprogrammability for cost and simplicity, while M27C4001-45XN6TR trades through-hole reliability and proven UV erasure for SMT density - neither replicates the FDIP40W's combination of hermeticity, optical access, and legacy system compatibility.
Availability
M27C4002-45XF1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROMs, and avionics maintenance terminal BIOS requiring stable component supply, long-lifecycle support, and verified UV-erasable functionality.
Supply support for M27C4002-45XF1 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 solutions for industrial, automotive, and consumer markets.
The M27C series was developed specifically for high-reliability, long-lifecycle embedded systems requiring field-erasable non-volatile storage - targeting applications where EEPROM endurance or Flash write complexity were unacceptable trade-offs in the 1990s–2000s.
FAQ
Can M27C4002-45XF1 be programmed with modern USB EPROM programmers?
Yes - it is supported by industry-standard programmers including Xeltek SuperPRO 3000U, BP Microsystems Series 4, and Data I/O PS-5000, provided they implement the PRESTO II algorithm and deliver precise 12.75V ±0.25V VPP with proper sequencing relative to VCC. Firmware version compatibility must be confirmed against the programmer's device library release notes.
What UV wavelength and exposure time are required for full erasure?
Full erasure requires short-wave ultraviolet light at 2537 Å with a minimum integrated dose of 15 W·s/cm². Using a standard 12,000 µW/cm² lamp at 2.5 cm distance, this equates to 15–20 minutes. Longer wavelengths (e.g., 365 nm) or indirect fluorescent lighting yield incomplete or highly variable erasure and are not recommended.
Is the FDIP40W package compatible with standard DIP-40 sockets?
Yes - the FDIP40W has 0.6-inch body width and 0.1-inch pin pitch matching JEDEC MS-011, making it mechanically compatible with standard 40-pin DIP sockets. However, its ceramic construction and quartz window require careful handling to avoid cracking or contamination of the UV-transmissive surface.
Does M27C4002-45XF1 support byte-level programming or only full-array writes?
It supports word-level (16-bit) programming only - each 100 µs pulse programs one 16-bit word. While individual words can be addressed and programmed selectively, there is no hardware provision for partial-word (byte or bit) programming; "0" bits are written selectively, but "1" restoration requires full UV erasure.
M27C4002-45XF1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 40-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:
- 256K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-CDIP Frit Seal with Window
M27C4002-45XF1 FAQ
1.How can I place an order for M27C4002-45XF1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M27C4002-45XF1 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 M27C4002-45XF1 reliable?
The price and inventory of M27C4002-45XF1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4002-45XF1 is usually 5 days.
3.What payment methods are accepted for M27C4002-45XF1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4002-45XF1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M27C4002-45XF1?
M27C4002-45XF1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M27C4002-45XF1 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 M27C4002-45XF1?
For technical support, including M27C4002-45XF1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4002-45XF1 requirements.
6.How does Aetrix verify that M27C4002-45XF1 is sourced from the original manufacturer or authorized distributors?
All M27C4002-45XF1 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 M27C4002-45XF1 meets industry standards.
7.What is the process for return or replacement of M27C4002-45XF1?
All M27C4002-45XF1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4002-45XF1, 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 M27C4002-45XF1 part is unused and in its original packaging.
Return procedure for M27C4002-45XF1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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