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

STMicroelectronics M27W401-80K6

Name: M27W401-80K6
Brand: STMicroelectronics
SKU: M27W401-80K6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27W401-80K6

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-LCC (J-Lead)

Datasheet:: M27W401-80K6.pdf

Description:: IC EPROM 4MBIT PARALLEL 32PLCC

Quantity:: RFQ Add To RFQ list

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Inventory:2,930

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Product details

Overview

M27W401-80K6 from STMicroelectronics is a 4 Mbit (512K × 8) low-voltage UV-erasable EPROM in PLCC32 package, operating from 2.7V to 3.6V with 80 ns access time at V_CC = 2.7V–3.6V, supporting microprocessor program storage in industrial and embedded systems requiring nonvolatile code retention and field reprogrammability via UV exposure.

For engineers reviewing the M27W401-80K6 datasheet, M27W401-80K6 pinout, M27W401-80K6 application, or M27W401-80K6 equivalent, key selection considerations include its dual-mode operation (read/standby), two-line output control (E/G), electronic signature (20h/41h), 15 µA standby current, and compatibility with Presto II programming algorithm on standard M27C4001 programmers.

Technical Context

The M27W401-80K6 implements a CMOS-based EPROM architecture with separate chip enable (E) and output enable (G) controls enabling low-power array partitioning. Its read mode requires both E and G asserted low, while standby is entered when E is high, forcing outputs to high-impedance and reducing ICC to 15 µA.

Programming uses V_PP = 12.75 V and V_CC = 6.25 V with 100 µs/byte pulses and automatic margin verify; erasure requires UV exposure (2537 Å, ≥15 W·s/cm²) through the windowed ceramic package variant - though the K-suffixed PLCC32 is OTP-only and lacks UV window.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4 Mbit (524,288 × 8 bits) - supports full 19-bit address space for boot code or firmware storage
Read Access Time	80 ns at V_CC = 2.7V–3.6V - enables direct interface with 12.5 MHz bus clocks without wait states
Supply Voltage (Read)	2.7V to 3.6V - compatible with 3.3V logic systems and battery-powered designs
Standby Current	15 µA max - extends battery life in portable or low-power hold modes
Active Current	15 mA max at 5 MHz - defines decoupling capacitor sizing (0.1 µF ceramic per device)
Programming Voltage	V_PP = 12.75 V, V_CC = 6.25 V - requires dedicated EPROM programmer with dual-rail supply
Electronic Signature	Manufacturer Code 20h, Device Code 41h - ensures auto-recognition by Presto II-compatible programmers

Pinout & Package

PLCC32 (32-lead Plastic Leaded Chip Carrier, JEDEC MO-047AC), 11.43 mm × 13.97 mm body, gull-wing leads, RoHS-compliant ECOPACK® lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address Inputs	19-bit address bus accepting full 512K-word range; TTL-compatible inputs
Q0–Q7	Data Outputs	8-bit bidirectional data bus during programming/verify; open-drain capable in read mode
E	Chip Enable	Primary device select; high = standby (15 µA), low = active or programmable state
G	Output Enable	Secondary output gate; independent of E, prevents bus contention in multi-chip memory arrays
V_PP	Program Supply	12.75 V input required only during programming/verify; must be applied after V_CC
V_CC	Supply Voltage	2.7–3.6 V for read/standby; 6.25 V for programming - strict sequencing required
V_SS	Ground	Reference for all I/O and internal logic; requires local 0.1 µF decoupling

Key Features

Feature	Design Value
Two-line output control (E + G)	Enables zero-bus-contention memory expansion and selective low-power deselection of unaddressed devices
Presto II programming algorithm	Guarantees full-array programming in ≤52.5 s with margin-verified cells, eliminating overprogramming risk
Electronic signature (20h/41h)	Ensures plug-and-play compatibility with legacy M27C4001 programming hardware and software
ECOPACK® packaging	Lead-free PLCC32 meets RoHS and JEDEC JESD97 interconnect classification requirements
High-reliability CMOS process	2000 V HBM ESD rating and 200 mA latch-up immunity support robust industrial deployment

Applications

Industrial PLC Firmware Storage

Legacy Embedded Boot ROM

Use Scenario: Storing fixed boot loader and configuration tables in programmable logic controllers operating in harsh temperature environments (−40°C to +85°C).

IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; accessed during power-on reset with 80 ns timing budget.

Use Value: Low 2.7V operation extends runtime on backup batteries; 15 µA standby current minimizes energy drain during idle cycles.

Use Scenario: Replacing obsolete M27C4001 in legacy medical instrument mainboards where firmware updates are infrequent but field-programmable capability is retained.

IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement EPROM providing identical 512K×8 organization and electronic signature.

Use Value: Eliminates redesign effort while enabling continued use of existing Presto II programmers and test fixtures.

Automotive Diagnostic Tool Memory

Test Equipment Calibration Data Storage

Use Scenario: Holding vehicle-specific diagnostic routines and protocol stacks in handheld OBD-II scanners powered by single-cell Li-ion batteries.

IC Role / Device Role / Timing Role: Read-only code storage accessed via 8-bit parallel bus; operates across extended voltage range (2.7–3.6V) as battery discharges.

Use Value: 80 ns access time sustains real-time response under worst-case V_CC = 2.7V; ECOPACK® compliance satisfies automotive RoHS requirements.

Use Scenario: Storing factory-calibrated coefficients and sensor compensation tables in benchtop multimeters and signal generators.

IC Role / Device Role / Timing Role: One-time programmable (OTP) nonvolatile memory; written once during final test, then permanently locked.

Use Value: PLCC32 package allows socketed installation for easy calibration update; no UV erasure needed, eliminating window contamination risk.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C400-12DC	5V-only operation (120 ns access), no low-voltage support; 5V V_CC/V_PP programming	Requires 5V system rail and dedicated 5V programmer; incompatible with 3.3V logic interfaces	Select only if legacy 5V infrastructure is fixed and voltage scaling is not required
M27C4001-12F1	Same 5V architecture, FDIP32W UV-erasable package with quartz window; 120 ns access	Supports unlimited reprogramming via UV, but lacks low-voltage operation and ECOPACK® compliance	Choose when field re-erasure is mandatory and environmental compliance is secondary

Compared with AM27C400-12DC and M27C4001-12F1, the M27W401-80K6 uniquely delivers 2.7–3.6V operation, 80 ns speed at low voltage, and RoHS-compliant PLCC32 packaging - making it the sole option for space-constrained, battery-powered, or modern eco-regulated designs requiring EPROM functionality.

Availability

M27W401-80K6 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM replacement, and automotive diagnostic tool memory requiring stable component supply and long-term obsolescence management.

Supply support for M27W401-80K6 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, microcontroller, memory, and power devices for industrial, automotive, and consumer markets.

The M27W401 belongs to ST's legacy EPROM product line, engineered specifically for pin-compatible migration from 5V M27C4001 systems to low-voltage, RoHS-compliant platforms while preserving programming ecosystem investment.

FAQ

Is M27W401-80K6 UV-erasable?

No. The "K" suffix denotes PLCC32 packaging, which is OTP-only. UV erasure requires the "F" (FDIP32W) ceramic package with quartz window. This part is programmed once and retains data indefinitely without UV exposure capability.

What programming equipment supports M27W401-80K6?

M27W401-80K6 is fully compatible with Presto II–enabled programmers (e.g., BP Microsystems Series, Xeltek SuperPro) configured for M27C4001. It requires V_PP = 12.75 V and V_CC = 6.25 V, with electronic signature 20h/41h for automatic algorithm selection.

Does M27W401-80K6 support 3.3V-only system interfacing?

Yes. Its read-mode V_CC range is 2.7V–3.6V, and all I/Os are TTL-compatible with V_IL ≤ 0.2V_CC and V_IH ≥ 0.7V_CC, ensuring reliable operation with standard 3.3V microcontrollers and FPGAs without level shifting.

How is standby current achieved and verified?

Standby current (15 µA max) is achieved by holding E high (≥ V_CC − 0.2 V), placing all circuitry in low-power state. It is verified per Table 5 (ICC2) at T_A = −40°C to +85°C, V_CC ≤ 3.6 V, and confirmed in production via parametric testing per ST's QM-300 specification.

M27W401-80K6 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:: 80 ns

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

M27W401-80K6 FAQ

1.How can I place an order for M27W401-80K6 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27W401-80K6 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 M27W401-80K6 reliable?

The price and inventory of M27W401-80K6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27W401-80K6 is usually 5 days.

3.What payment methods are accepted for M27W401-80K6?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27W401-80K6 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27W401-80K6?

M27W401-80K6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27W401-80K6 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 M27W401-80K6?

For technical support, including M27W401-80K6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27W401-80K6 requirements.

6.How does Aetrix verify that M27W401-80K6 is sourced from the original manufacturer or authorized distributors?

All M27W401-80K6 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 M27W401-80K6 meets industry standards.

7.What is the process for return or replacement of M27W401-80K6?

All M27W401-80K6 units undergo pre-shipment inspection (PSI). If there is an issue with M27W401-80K6, 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 M27W401-80K6 part is unused and in its original packaging.

Return procedure for M27W401-80K6:

1.Submit a request within 90 days.

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

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