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

STMicroelectronics M27C4001-10B1

Name: M27C4001-10B1
Brand: STMicroelectronics
SKU: M27C4001-10B1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C4001-10B1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-DIP (0.600", 15.24mm)

Datasheet:: M27C4001-10B1.pdf

Description:: IC EPROM 4MBIT PARALLEL 32DIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,080

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Product details

Overview

M27C4001-10B1 from STMicroelectronics is a 4 Mbit (512K × 8) UV-erasable EPROM in a 32-pin PDIP package, operating at 5V ±10%, with 35 ns access time, 30 mA active current, and 100 µA 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 M27C4001-10B1 datasheet, M27C4001-10B1 pinout, M27C4001-10B1 application, or M27C4001-10B1 equivalent, key selection criteria include UV erasure capability, TTL-compatible two-line output control (E/G), 12.75V programming voltage, PRESTO II algorithm support, and ECOPACK®-compliant lead-free packaging.

Technical Context

The M27C4001-10B1 implements a parallel-addressed, byte-wide EPROM architecture with dual active-low control: Chip Enable (E) for device selection and power gating, and Output Enable (G) for output bus arbitration. Its logic diagram confirms full TTL-level input compatibility except for A9 during Electronic Signature mode (11.5–12.5 V).

It supports four distinct operational modes-Read, Standby, Programming, and Verify-each defined by specific voltage and timing conditions on E, G, VPP, and A9. Erasure requires UV exposure through the windowless PDIP variant's ceramic frit-seal lid (not applicable to -10B1, which is OTP-capable but UV-erasable only in FDIP32W variants; -10B1 is PDIP32, UV-erasable per ST documentation).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4 Mbit (524,288 × 8 bits); supports full 19-bit address space (A0–A18)
Access Time	35 ns max (tAVQV); determines minimum CPU wait-state requirement in 5 MHz bus systems
Supply Voltage	5 V ±10% in Read mode; enables direct interface with 5 V TTL/CMOS buses without level translation
Active Current	30 mA at 5 MHz; defines decoupling capacitor sizing (0.1 µF ceramic + 4.7 µF bulk per 8 devices)
Standby Current	100 µA (CMOS E high); reduces system idle power by >99% vs active mode
Programming Voltage	VPP = 12.75 V ±0.25 V; requires dedicated HV supply rail, not derived from VCC
Programming Time	100 µs per word; enables full array programming in ~52.5 s using PRESTO II algorithm

Pinout & Package

Package: PDIP32 (Plastic Dual In-line Package, 600 mil width, ECOPACK®-compliant, lead-free). Pin count: 32. Body dimensions: 39.9 mm × 15.2 mm × 4.45 mm (max).

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address Inputs	19-bit parallel address bus; fully decoded to select one of 524,288 bytes
Q0–Q7	Data Outputs	Bi-directional data bus in programming mode; outputs valid only when E and G are low
E	Chip Enable	Primary device-select signal; CMOS-high places device in 100 µA standby (outputs Hi-Z)
G	Output Enable	Secondary output gate; allows shared G-bus across memory arrays while keeping deselected chips in standby
VPP	Program Supply	12.75 V input required only during programming/verify; must be applied after VCC and removed before VCC
VCC	Supply Voltage	5 V ±10% main supply; powers core logic and I/O buffers in Read/Standby; 6.25 V ±0.25 V in Programming mode
VSS	Ground	Reference node for all DC and AC parameters; requires low-inductance connection to minimize switching noise

Key Features

Feature	Design Value
Two-line output control (E + G)	Enables zero-bus-contention memory expansion: E selects device, G gates output-critical for multi-chip arrays
PRESTO II programming algorithm	Guarantees margin-safe programming via auto-verified 100 µs pulses; eliminates over-programming and cell wear
Electronic Signature (20h/41h)	Manufacturer code (20h) and device ID (41h) readable via A9 high-voltage mode-enables automated programmer recognition
UV erasability (FDIP32W) / OTP capability (PDIP32)	M27C4001-10B1 is UV-erasable PDIP variant per ST spec; supports reprogramming after UV exposure (~15–20 min at 2537 Å)
ECOPACK® compliance	Lead-free construction with JEDEC JESD97 marking; meets RoHS and WEEE environmental requirements

Applications

Industrial PLC Firmware Storage

Telecom Line Card Boot Code

Use Scenario: Storing ladder logic and I/O configuration in programmable logic controllers deployed in factory automation environments with ambient temperatures up to 85 °C.

IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic 35 ns read access to instruction fetch cycles of 8051 or Z80-based controllers.

Use Value: UV erasability allows field firmware updates without PCB rework; 100 µA standby current extends uptime in battery-backed modules.

Use Scenario: Holding initialization code and protocol stacks for T1/E1 framing ICs in carrier-grade telecom equipment operating under NEBS Level 3 thermal stress.

IC Role / Device Role / Timing Role: Parallel-addressed EPROM interfaced directly to Motorola 68K bus; synchronized via E/G handshaking to avoid bus contention during hot-swap events.

Use Value: PRESTO II programming ensures reliable field reflash of line card firmware; ECOPACK® compliance satisfies telco environmental certification.

Medical Instrument Bootloader

Avionics Maintenance Diagnostic Module

Use Scenario: Storing certified bootloader and self-test routines in FDA-class II diagnostic devices where firmware integrity must be verifiable pre-boot.

IC Role / Device Role / Timing Role: Secure read-only memory mapped at reset vector; accessed only during cold start via fixed address decode.

Use Value: Electronic Signature (20h/41h) enables automated verification of correct ST part during production test; UV erasure supports post-certification patching.

Use Scenario: Providing maintenance firmware and fault-tree lookup tables in ARINC-664-compliant avionics LRUs installed in commercial aircraft cabins.

IC Role / Device Role / Timing Role: Standalone EPROM used in isolated diagnostic subsystem; operates at –40 to 85 °C with no external clock or controller dependency.

Use Value: 5 V ±10% operation matches aircraft 28 VDC-derived regulated supplies; 35 ns access ensures real-time response to BIT (Built-In Test) triggers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C4001-12DC	12 ns slower access (47 ns), same 4 Mbit organization, AMD-manufactured, identical PDIP32 pinout	Requires longer CPU wait states; compatible with same socket and address decode logic	Select if legacy AMD toolchain or existing AM27C4001 inventory exists; verify timing margins in high-speed bus designs
MX27C4001PC-12	Macronix variant; 47 ns access, 5 V ±5% VCC tolerance (tighter than ST's ±10%), same programming voltage	Higher VCC stability requirement may conflict with noisy industrial rails; otherwise drop-in in most systems	Prefer for new designs where tighter VCC regulation is guaranteed; avoid in unregulated 5 V domains unless local LDO added

Compared with AM27C4001-12DC and MX27C4001PC-12, the M27C4001-10B1 offers the fastest access (35 ns), widest VCC tolerance (±10%), and native support for PRESTO II programming-making it optimal for timing-critical, field-upgradable, and cost-sensitive industrial deployments.

Availability

M27C4001-10B1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, telecom line card boot code, and medical instrument bootloader applications requiring stable component supply across extended product lifecycles.

Supply support for M27C4001-10B1 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M27C4001 belongs to ST's legacy EPROM product line, engineered specifically for robust, field-erasable firmware storage in mission-critical embedded systems where long-term data retention and UV reprogrammability are mandatory.

FAQ

Is M27C4001-10B1 UV-erasable despite being in PDIP32 packaging?

Yes. Although PDIP32 lacks a quartz window, ST specifies the M27C4001-10B1 as UV-erasable per its datasheet summary description and erasure section. It uses a transparent ceramic frit-seal process enabling UV transmission through the plastic body-confirmed in ST's "FDIP32W (F) PLCC32 (C) TSOP32 (N) PDIP32 (B)" listing and Figure 2 pinout labeling. Erasure requires 15–20 minutes under 2537 Å UV light at 12,000 µW/cm² intensity.

What is the correct VCC voltage during programming?

VCC must be set to 6.25 V ±0.25 V during programming and verify operations, per Table 8 and Section 2.5. This is distinct from the 5 V ±10% used in Read mode. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP to prevent latch-up or cell damage-failure to observe this sequencing risks permanent write failure.

Can M27C4001-10B1 be used in a 3.3 V system?

No. The M27C4001-10B1 is strictly a 5 V device: Read mode requires 5 V ±10%, Programming mode requires 6.25 V, and VIH/VIL thresholds are TTL-defined (0.8 V/2.0 V). Interfacing to 3.3 V logic requires level-shifting on all address, data, and control lines-including E, G, and A9-and violates ST's Absolute Maximum Ratings for VIO (–2 V to 7 V) only under transient conditions, not sustained operation.

How does the Electronic Signature mode work, and why is A9 special?

Electronic Signature activates when 11.5–12.5 V is applied to A9 (with VCC = VPP = 5 V), causing Q7–Q0 to output Manufacturer Code (20h) when A0 = low, then Device Code (41h) when A0 = high. A9 is special because it is the only pin rated to 13.5 V (Table 4), enabling this high-voltage identification mode-used exclusively by programmers to auto-detect ST's M27C4001 and load the correct PRESTO II algorithm.

M27C4001-10B1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-DIP (0.600", 15.24mm)

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:: 100 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-PDIP

M27C4001-10B1 FAQ

1.How can I place an order for M27C4001-10B1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C4001-10B1 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 M27C4001-10B1 reliable?

The price and inventory of M27C4001-10B1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C4001-10B1 is usually 5 days.

3.What payment methods are accepted for M27C4001-10B1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C4001-10B1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C4001-10B1?

M27C4001-10B1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C4001-10B1 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 M27C4001-10B1?

For technical support, including M27C4001-10B1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C4001-10B1 requirements.

6.How does Aetrix verify that M27C4001-10B1 is sourced from the original manufacturer or authorized distributors?

All M27C4001-10B1 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 M27C4001-10B1 meets industry standards.

7.What is the process for return or replacement of M27C4001-10B1?

All M27C4001-10B1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C4001-10B1, 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 M27C4001-10B1 part is unused and in its original packaging.

Return procedure for M27C4001-10B1:

1.Submit a request within 90 days.

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

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