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Home > Products > Integrated Circuits (ICs) > Memory > Memory

STMicroelectronics M27C4001-55C1

Name: M27C4001-55C1
Brand: STMicroelectronics
SKU: M27C4001-55C1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C4001-55C1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-LCC (J-Lead)

Datasheet:: M27C4001-55C1.pdf

Description:: IC EPROM 4MBIT PARALLEL 32PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M27C4001-55C1 from STMicroelectronics is a 4 Mbit (512K × 8) OTP EPROM in PLCC32 package, designed for non-volatile program storage in legacy microprocessor systems. It operates at 5V ±10%, delivers 55 ns access time, draws 30 mA active current and 100 µA standby current, and supports TTL-level addressing and data I/O. It is used in industrial control firmware, boot ROMs for 8/16-bit MCUs, and embedded system BIOS storage where one-time programming and long-term data retention are required.

For engineers reviewing the M27C4001-55C1 datasheet, M27C4001-55C1 pinout, M27C4001-55C1 application, or M27C4001-55C1 equivalent, key selection criteria include verified 55 ns read timing under 5V operation, PLCC32 mechanical compatibility with legacy socketing, OTP configuration eliminating UV erasure infrastructure, and dual-line output control (E/G) for bus contention avoidance in multi-chip memory arrays.

Technical Context

The M27C4001-55C1 implements a standard EPROM architecture with address latching via A0–A18 inputs and parallel 8-bit data I/O on Q0–Q7. Its two-line output enable scheme uses Chip Enable (E) for device selection and Output Enable (G) for output gating-enabling low-power deselection and precise bus timing control.

It supports only Read and Standby modes in OTP configuration (no UV erasure), with programming performed at VPP = 12.75V ±0.25V and VCC = 6.25V ±0.25V. The Electronic Signature mode (Manufacturer Code 20h, Device Code 41h) enables automated programmer identification without requiring external protocol negotiation.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4 Mbit (524,288 × 8 bits); provides full 512 KB of non-volatile code space for 80Cxx/68K/Z80-based systems
Access Time	55 ns max (tAVQV); ensures compatibility with 18 MHz CPU buses without wait states
Supply Voltage	5V ±10% in Read mode; eliminates need for dedicated logic-level regulators in legacy 5V systems
Active Current	30 mA at 5 MHz; enables stable operation with standard 5V/100 mA LDOs and 0.1 µF local decoupling
Standby Current	100 µA; reduces idle power in battery-backed or energy-sensitive industrial controllers
Output Control	Two-line (E + G); prevents bus contention when multiple EPROMs share data lines in banked memory maps
Programming Voltage	VPP = 12.75V ±0.25V; requires dedicated HV supply but avoids complex charge-pump circuitry

Pinout & Package

Package: PLCC32 (Plastic Leaded Chip Carrier, 32-pin, J-lead, 11.43 mm × 13.97 mm body, JEDEC MO-047AC).

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address Inputs	19-bit address bus interface; supports full 512K-word addressing with no external decoding overhead
Q0–Q7	Data I/O	Bidirectional 8-bit data path; outputs valid within 55 ns of E/G assertion, inputs sampled during programming pulses
E	Chip Enable	Primary device select; CMOS high (VIH > VCC – 0.2V) places device in 100 µA standby; TTL low enables memory array
G	Output Enable	Secondary output gate; controls Q0–Q7 Hi-Z vs. driven state independently of E, enabling shared bus arbitration
VPP	Programming Supply	12.75V ±0.25V input; must be applied before/with VCC during programming; inactive (VCC level) during read
VCC	Power Supply	5V ±10% for read; 6.25V ±0.25V for programming; strict sequencing required (VCC before VPP, remove VCC after VPP)
VSS	Ground	Reference for all I/O and supply pins; requires low-inductance connection to minimize noise-induced read errors

Key Features

Feature	Design Value
OTP Configuration	Eliminates UV erasure lamp infrastructure and quartz window handling; suitable for sealed industrial enclosures
Two-Line Output Control	Enables zero-wait-state memory expansion up to 4 devices on same data bus without external bus transceivers
Electronic Signature	Manufacturer Code 20h / Device Code 41h readable via A9 voltage forcing; enables auto-detection in universal programmers
ECOPACK® Compliance	Lead-free PLCC32 package meeting JEDEC JESD97 marking requirements; supports RoHS-compliant legacy system rework
Low Standby Power	100 µA max at VIH on E; extends battery life in maintenance-mode firmware loaders and diagnostic tools

Applications

Industrial PLC Firmware Storage

Legacy MCU Boot ROM

Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Non-volatile boot memory mapped at reset vector; accessed during cold start with deterministic 55 ns latency.

Use Value: Guarantees firmware integrity across 10+ year deployments without battery backup or refresh cycles.

Use Scenario: Providing initial instruction fetch for Z80 or 8085-based instrumentation controllers with no external flash controller.

IC Role / Device Role / Timing Role: Primary code memory executing from 0x0000; synchronized to CPU clock via E/G timing margins.

Use Value: Eliminates FPGA-based glue logic by supporting direct 8-bit bus interfacing with TTL-compatible voltage thresholds.

Embedded BIOS for Industrial HMI

Calibration Data Repository

Use Scenario: Holding display initialization routines and touch-screen calibration constants in panel-mounted human-machine interfaces.

IC Role / Device Role / Timing Role: Memory-mapped peripheral storing static startup sequences; read once per power cycle.

Use Value: Prevents field corruption via OTP write-once policy-no risk of accidental overwrites during firmware updates.

Use Scenario: Archiving sensor offset/gain coefficients in factory-calibrated test equipment with lifetime traceability.

IC Role / Device Role / Timing Role: Dedicated 64K segment storing 256-byte calibration records; accessed via indirect addressing.

Use Value: Ensures metrological traceability by locking coefficients at final test-no post-deployment modification possible.

Equivalent & Alternatives

The following parts are listed as comparable options for similar EPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C4001-55DC	55 ns access, 5V operation, PDIP32 package; higher active current (35 mA) and no ECOPACK® compliance	Requires through-hole PCB assembly and lacks lead-free certification; suited for prototyping or repair of vintage DIP-based boards	Select only if socket compatibility with legacy 32-pin DIP sockets is mandatory and RoHS is not required
AT27C4096-55PU	4 Mbit OTP EPROM, 55 ns, PDIP40 package; wider 40-pin footprint and different pinout (e.g., separate VPP/VCC pins)	Not pin-compatible; requires PCB redesign and layout revision; supports same 5V read but uses 12.5V programming	Choose only when upgrading from obsolete 40-pin EPROM footprints and full board re-spin is acceptable

Compared with AM27C4001-55DC and AT27C4096-55PU, the M27C4001-55C1 offers drop-in PLCC32 replacement capability, ECOPACK® compliance for modern rework, and tighter 100 µA standby current-critical for low-power industrial modules where thermal management and regulatory conformance are prioritized over socket interchangeability.

Availability

M27C4001-55C1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy MCU boot ROMs, and embedded BIOS applications requiring stable component supply across extended product lifecycles.

Supply support for M27C4001-55C1 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 non-volatile memory design.

The M27C4001 belongs to ST's legacy EPROM product line, engineered specifically for cost-sensitive, long-lifecycle industrial control and instrumentation applications where reliability, pin compatibility, and programming simplicity outweigh density or speed scaling.

FAQ

Is M27C4001-55C1 UV-erasable or OTP-only?

The M27C4001-55C1 is an OTP (One-Time Programmable) variant. It uses the same die as the UV-erasable M27C4001 but is packaged in a PLCC32 with no quartz window-making ultraviolet erasure physically impossible. Programming is permanent and irreversible, aligning with applications requiring tamper-resistant firmware storage.

What is the correct power sequencing for programming M27C4001-55C1?

VCC must be applied simultaneously with or before VPP, and removed simultaneously or after VPP. During programming, VCC = 6.25V ±0.25V and VPP = 12.75V ±0.25V. Violating this sequence risks incomplete programming or cell damage. The PRESTO II algorithm applies 100 µs pulses per byte and verifies in margin mode to ensure reliable threshold voltage margin.

Can M27C4001-55C1 be used in a 3.3V system?

No. The M27C4001-55C1 is specified only for 5V ±10% operation in Read mode and 6.25V ±0.25V in Programming mode. Its input thresholds (VIH = 2V min, VIL = 0.8V max) and output drive levels (VOH = 2.4V TTL, VOL = 0.4V) are incompatible with 3.3V logic families. Interfacing requires level-shifting buffers or voltage translation ICs.

Does M27C4001-55C1 support page or burst programming?

No. The M27C4001-55C1 supports only byte-level programming with 100 µs pulses per word. It does not implement internal address counters, auto-increment, or page write modes. Each address must be explicitly presented, and each byte verified individually-requiring host controller firmware to manage full address/data sequencing and verify loops.

M27C4001-55C1 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:: 4Mbit

Memory Organization:: 512K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 55 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-PLCC (11.35x13.89)

M27C4001-55C1 FAQ

1.How can I place an order for M27C4001-55C1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C4001-55C1 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 M27C4001-55C1 reliable?

The price and inventory of M27C4001-55C1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-55C1 is usually 5 days.

3.What payment methods are accepted for M27C4001-55C1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-55C1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C4001-55C1?

M27C4001-55C1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C4001-55C1 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 M27C4001-55C1?

For technical support, including M27C4001-55C1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-55C1 requirements.

6.How does Aetrix verify that M27C4001-55C1 is sourced from the original manufacturer or authorized distributors?

All M27C4001-55C1 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 M27C4001-55C1 meets industry standards.

7.What is the process for return or replacement of M27C4001-55C1?

All M27C4001-55C1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-55C1, 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 M27C4001-55C1 part is unused and in its original packaging.

Return procedure for M27C4001-55C1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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