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STMicroelectronics M27W401-80N6

Name: M27W401-80N6
Brand: STMicroelectronics
SKU: M27W401-80N6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27W401-80N6

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-TFSOP (0.724", 18.40mm Width)

Datasheet:: M27W401-80N6.pdf

Description:: IC EPROM 4MBIT PARALLEL 32TSOP

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Inventory:2,804

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Product details

Overview

M27W401-80N6 from STMicroelectronics is a 4 Mbit (512K × 8) low-voltage UV-erasable EPROM in TSOP32 (8 × 20 mm) 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 battery-powered industrial controllers and legacy embedded systems requiring nonvolatile code retention without reprogramming.

For engineers reviewing the M27W401-80N6 datasheet, M27W401-80N6 pinout, M27W401-80N6 application, or M27W401-80N6 equivalent, key selection considerations include its dual-line output control (E/G), 15 µA standby current, UV erasure capability, 12.75V V_PP programming voltage, and compatibility with Presto II algorithm on standard EPROM programmers.

Technical Context

The M27W401-80N6 implements a CMOS-based EPROM architecture with two independent enable controls: Chip Enable (E) for power gating and Output Enable (G) for output bus control - enabling low-power standby (15 µA) and eliminating bus contention in multi-device memory arrays. It supports TTL-level address/data inputs and requires 12.75V on V_PP and 6.25V on V_CC during programming.

Its electronic signature (Manufacturer Code 20h, Device Code 41h) matches the M27C4001, ensuring drop-in compatibility with existing programming hardware. Erasure is performed via 2537 Å UV light (≥15 W·s/cm² dose), while read operation is fully functional across –40°C to +85°C with guaranteed timing at 80 ns.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4 Mbit (524,288 × 8 bits) - supports full 19-bit addressing for boot code or firmware storage in 8-bit microprocessor systems.
Read Access Time	80 ns at V_CC = 2.7V–3.6V - meets timing requirements for 12.5 MHz Z80 or 8051-based systems with no wait states.
Supply Voltage (Read)	2.7V–3.6V - enables direct interface with 3.3V logic and extends battery life in portable instrumentation.
Standby Current	15 µA max - reduces quiescent power in always-on monitoring modules where EPROM remains powered but inactive.
Programming Voltage	V_PP = 12.75V ± 0.25V - requires dedicated high-voltage supply rail; not compatible with 5V-only programmers.
UV Erase Dose	≥15 W·s/cm² at 2537 Å - ensures complete bit reset after ~15–20 min exposure under standard UV lamps.
Operating Temp	–40°C to +85°C - qualified for industrial control cabinets and automotive under-hood auxiliary modules.

Pinout & Package

TSOP32 (8 × 20 mm) surface-mount package with gull-wing leads, JEDEC MO-147AC compliant, lead-free ECOPACK® construction.

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address Inputs	19-bit address bus accepting 0–524,287; A9 used for Electronic Signature mode when driven to 12V.
Q0–Q7	Data Outputs	8-bit bidirectional data bus - outputs valid only when E = L and G = L; high-impedance otherwise.
E	Chip Enable	Active-low primary device select; drives device into standby (15 µA) when high.
G	Output Enable	Active-low output gate; allows shared data bus usage without contention when E is decoded per device.
V_PP	Program Supply	12.75V input required only during programming/verify; must be applied before or with V_CC.
V_CC	Supply Voltage	2.7V–3.6V for read/standby; 6.25V ± 0.25V for programming - separate voltage domains prevent logic corruption.
V_SS	Ground	Reference for all I/O and internal circuitry; requires local 0.1 µF ceramic decoupling per device.

Key Features

Feature	Design Value
Two-line output control (E/G)	Enables zero-bus-contention memory expansion and reduces system power by placing unused devices in 15 µA standby.
Presto II programming algorithm	Guarantees margin-safe programming in ≤52.5 s using 100 µs pulses and automatic margin verify at elevated V_CC.
Electronic Signature (20h/41h)	Allows automatic device identification in universal programmers - identical to M27C4001 for seamless tool migration.
UV erasability (FDIP32W variant)	Supports field firmware updates via quartz-window ceramic package; N-suffix TSOP32 is OTP-only.
ECOPACK® lead-free packaging	Meets RoHS and JEDEC JESD97 interconnect standards; inner box label specifies second-level interconnect category.

Applications

Industrial PLC Firmware Storage

Legacy Medical Device Boot ROM

Use Scenario: Fixed-function programmable logic controller storing ladder logic firmware in factory automation cells with no field update requirement.

IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing instruction fetch for 8051-compatible MCU at power-up; accessed at 80 ns latency.

Use Value: Eliminates need for external EEPROM or Flash; 2.7V operation extends runtime on backup coin-cell batteries during brownout events.

Use Scenario: Embedded diagnostic instrument (e.g., patient monitor front-end) requiring certified, unchangeable startup code for regulatory compliance.

IC Role / Device Role / Timing Role: Read-only program memory mapped to CPU address space; verified at manufacturing and never rewritten in field.

Use Value: Immune to accidental overwrites or radiation-induced bit flips; UV window option allows rework during design validation phase.

Avionics Test Equipment BIOS

Automotive ECU Calibration Data

Use Scenario: Ground-support test set for aircraft subsystems, storing self-test routines and interface protocol stacks.

IC Role / Device Role / Timing Role: Static code storage accessed during cold start; operates across –40°C to +85°C without derating.

Use Value: Qualified temperature range and 200 mA latchup immunity ensure reliability in vibration-prone rack-mounted enclosures.

Use Scenario: Engine control unit storing factory-calibrated lookup tables for fuel injection timing and emissions tuning.

IC Role / Device Role / Timing Role: OTP configuration memory holding immutable calibration constants; programmed once during final test.

Use Value: Prevents unauthorized modification of emission-critical parameters; TSOP32 footprint minimizes PCB area vs. PDIP alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar EPROM-based firmware storage applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
M27C4001-12F1	5V-only operation (12 ns access); no low-voltage read mode; same 4 Mbit organization and pinout.	Requires 5V system rail; incompatible with 3.3V logic; UV-erasable with ceramic DIP package only.	Select only if legacy 5V infrastructure exists and battery operation is irrelevant.
AT27C040-70PU	5V operation; 70 ns access; 12V V_PP; same PLCC32/PDIP32 footprints; Atmel-manufactured.	Not pin-compatible with TSOP32; lacks ECOPACK®; higher standby current (100 µA).	Choose for cost-sensitive 5V designs where TSOP32 footprint is not required and RoHS exemption applies.

Compared with M27W401-80N6, the M27C4001-12F1 demands higher supply voltage and offers faster access but forfeits battery-friendly low-voltage operation, while the AT27C040-70PU provides similar density and programming compatibility but lacks the 2.7V read capability and modern lead-free packaging.

Availability

M27W401-80N6 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and avionics test equipment BIOS requiring stable component supply and long-term obsolescence management.

Supply support for M27W401-80N6 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, specializing in microcontrollers, power management, sensors, and legacy memory solutions for industrial, automotive, and consumer markets.

The M27W401 belongs to ST's mature EPROM product line, designed specifically for cost-sensitive, high-reliability embedded systems where firmware immutability, UV reprogrammability, and low-power 3.3V compatibility are critical.

FAQ

Is M27W401-80N6 UV-erasable?

No - the "N6" suffix denotes the TSOP32 package with no quartz window; it is one-time programmable (OTP). Only FDIP32W (windowed ceramic DIP) variants support UV erasure. This part is programmed once during manufacturing and retains data indefinitely without power.

What programming equipment is required for M27W401-80N6?

A Presto II–compatible EPROM programmer capable of delivering 12.75V on V_PP, 6.25V on V_CC, and 12V on A9 for electronic signature verification is required. Standard 5V-only programmers cannot program this device due to its dual-voltage programming architecture.

Can M27W401-80N6 replace M27C4001 in existing designs?

Yes, for read operations - it is pin- and function-compatible with M27C4001 and shares identical electronic signature (20h/41h). However, it requires lower V_CC (2.7–3.6V vs. 4.5–5.5V) and different programming voltages, so system-level power and programmer modifications are necessary.

Does M27W401-80N6 support standby mode with CMOS-level inputs?

Yes - applying a CMOS-high signal (>V_CC – 0.2V) to E places the device in standby mode with 15 µA typical current draw. This is distinct from TTL-high standby (E ≥ 2.0V), which draws up to 1 mA; CMOS-level enable is essential for ultra-low-power battery applications.

M27W401-80N6 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-TFSOP (0.724", 18.40mm Width)

Packaging:: Tray

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-TSOP

M27W401-80N6 FAQ

1.How can I place an order for M27W401-80N6 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27W401-80N6 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 M27W401-80N6 reliable?

The price and inventory of M27W401-80N6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27W401-80N6 is usually 5 days.

3.What payment methods are accepted for M27W401-80N6?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27W401-80N6 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27W401-80N6?

M27W401-80N6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27W401-80N6 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 M27W401-80N6?

For technical support, including M27W401-80N6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27W401-80N6 requirements.

6.How does Aetrix verify that M27W401-80N6 is sourced from the original manufacturer or authorized distributors?

All M27W401-80N6 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 M27W401-80N6 meets industry standards.

7.What is the process for return or replacement of M27W401-80N6?

All M27W401-80N6 units undergo pre-shipment inspection (PSI). If there is an issue with M27W401-80N6, 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 M27W401-80N6 part is unused and in its original packaging.

Return procedure for M27W401-80N6:

1.Submit a request within 90 days.

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

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