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

STMicroelectronics M27C1001-12F1

Name: M27C1001-12F1
Brand: STMicroelectronics
SKU: M27C1001-12F1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C1001-12F1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-CDIP (0.600", 15.24mm) Window

Datasheet:: M27C1001-12F1.pdf

Description:: IC EPROM 1MBIT PARALLEL 32CDIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,969

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Product details

Overview

M27C1001-12F1 from STMicroelectronics is a 1 Mbit (131,072 × 8) UV-erasable EPROM with 35 ns access time, 5V ±10% supply voltage, and FDIP32W ceramic window package enabling ultraviolet erasure. It features dual-line control (E/G), electronic signature (20h/05h), and operates across –40°C to 125°C for embedded microprocessor program storage.

For engineers reviewing the M27C1001-12F1 datasheet, M27C1001-12F1 pinout, M27C1001-12F1 application, or M27C1001-12F1 equivalent, key selection criteria include UV-erasability, 35 ns read timing, TTL-compatible I/O, 12.75 V programming voltage, and FDIP32W package compatibility with legacy EPROM sockets and UV erasers.

Technical Context

The M27C1001-12F1 implements a standard NMOS EPROM architecture with address decoding for A0–A16 and bidirectional data I/O on Q0–Q7. Its two-level enable logic (Chip Enable E and Output Enable G) enables low-power array partitioning and eliminates bus contention in multi-device memory systems.

Programming requires precise 12.75 V ±0.25 V on VPP, 6.25 V ±0.25 V on VCC, and 100 µs pulse width on P with A9 driven to 11.5–12.5 V for electronic signature verification. Erasure relies on 2537 Å UV exposure (≥15 W·s/cm²) through the FDIP32W transparent lid.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1 Mbit (131,072 words × 8 bits) - supports full 16-bit microprocessor instruction fetch without banking
Access Time	35 ns - enables direct interface with 20 MHz Z80, 8086, or 68000-based systems in read mode
Supply Voltage	5 V ±10% - compatible with standard TTL/CMOS logic rails and legacy power supplies
Active Current	30 mA at 5 MHz - defines decoupling requirement: 0.1 µF ceramic per device + 4.7 µF bulk per 8 devices
Standby Current	100 µA - enables low-power hold state during CPU wait states or idle cycles
Programming Voltage	12.75 V ±0.25 V - requires dedicated VPP generator; not derived from VCC
Electronic Signature	Manufacturer Code 20h / Device Code 05h - enables automatic algorithm selection in universal programmers

Pinout & Package

FDIP32W: 32-pin ceramic dual in-line package with UV-transparent frit-seal window (5.72 mm height, 41.9 mm length, 15.2 mm width), designed for socketed insertion and 2537 Å UV erasure at ≤2.5 cm distance.

Pin/Terminal	Circuit Role	Design Meaning
A0–A16	Address Inputs	17-bit address bus for full 131K-word addressing; A9 used as VID input during electronic signature
Q0–Q7	Data Outputs	8-bit bidirectional data bus; outputs driven during Read/Verify, inputs latched during Program
E	Chip Enable	Primary device select; CMOS-high places device in 100 µA standby with Hi-Z outputs
G	Output Enable	Secondary output gate; allows shared G-bus across multiple EPROMs while E selects individual devices
P	Program Control	Active-low pulse input; initiates programming only when E = VIL and VPP = 12.75 V
VPP	Programming Supply	Dedicated 12.75 V input; must be applied simultaneously with or after VCC and removed simultaneously or before VCC
VCC	Supply Voltage	5 V ±10% for read; 6.25 V ±0.25% for programming - separate regulation required
VSS	Ground	Reference for all I/O and internal logic; requires low-inductance connection adjacent to 0.1 µF decoupling cap
NC	No Connect	Pin 17 (LCCC32W) or Pin 9 (DIP/TSOP) - internally unconnected; must remain floating

Key Features

Feature	Design Value
Dual-line output control (E + G)	Enables zero-bus-contention memory expansion: E decodes chip select, G shares system READ line
UV-erasable FDIP32W package	Allows unlimited reprogramming via 15–20 min exposure to 2537 Å UV lamp at 12,000 µW/cm² intensity
Electronic signature (20h/05h)	Permits auto-detection by programming tools - eliminates manual device selection errors
PRESTO II programming algorithm	Guarantees full-array programming in ~13 s with margin-mode verify; no overprogram pulses needed
Wide temperature range	–40°C to +125°C operation supports industrial control, avionics, and automotive ECUs

Applications

Industrial PLC Firmware Storage

Legacy Military Avionics Boot ROM

Use Scenario: Storing fixed boot code and ladder logic firmware in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings.

IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; accessed during power-on reset and cyclic scan execution.

Use Value: UV-erasability enables field firmware updates using portable UV erasers; 35 ns access ensures real-time response within 10 ms PLC scan cycles.

Use Scenario: Holding mission-critical boot firmware in airborne flight control computers where radiation tolerance and long-term data retention are mandatory.

IC Role / Device Role / Timing Role: Primary boot ROM executing self-test and initialization routines prior to loading application software from flash or core memory.

Use Value: Ceramic FDIP32W package provides hermetic sealing and thermal stability; 125°C rating supports conduction-cooled chassis designs.

Medical Imaging System BIOS

Test Equipment Microcode Storage

Use Scenario: Storing diagnostic BIOS and calibration tables in X-ray and MRI subsystem controllers requiring regulatory-compliant, tamper-resistant firmware.

IC Role / Device Role / Timing Role: Secure, write-once-after-verification memory holding safety-critical startup sequences and hardware configuration data.

Use Value: Electronic signature (20h/05h) validates authenticity during manufacturing test; UV window allows post-deployment reprogramming if FDA-approved revision is issued.

Use Scenario: Holding microcode for automated test equipment (ATE) pattern generators and digital I/O controllers used in semiconductor final test.

IC Role / Device Role / Timing Role: Fixed-function instruction store controlling high-speed digital waveform generation and timing capture logic.

Use Value: 35 ns access time synchronizes with 20 MHz ATE clock domains; FDIP32W socket compatibility simplifies board-level repair and calibration updates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C1001-35DC	Same 1 Mbit × 8 organization, 35 ns access, but uses AMD's proprietary programming algorithm and signature codes (01h/05h)	Requires AMD-specific programmer firmware; not interchangeable in PRESTO II-based systems	Select only when existing toolchain supports AMD signature and timing margins
MX27C1001-35PC	Compatible pinout and AC specs, but rated only to 85°C and lacks electronic signature support	Suitable for commercial-grade systems only; cannot auto-identify in universal programmers	Choose for cost-sensitive, non-military applications where temperature range and auto-detection are not required

Compared with AM27C1001-35DC and MX27C1001-35PC, the M27C1001-12F1 uniquely combines ST's PRESTO II algorithm, full –40°C to 125°C rating, and standardized 20h/05h electronic signature - making it the only option qualified for reprogrammable industrial and aerospace firmware storage where toolchain interoperability and environmental robustness are mandatory.

Availability

M27C1001-12F1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy avionics boot ROM, medical imaging BIOS, and ATE microcode storage requiring stable component supply and long-lifecycle support.

Supply support for M27C1001-12F1 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, with design centers and manufacturing facilities across Europe, Asia, and the Americas.

The M27C1001 belongs to ST's legacy EPROM product line, engineered specifically for high-reliability, field-upgradable firmware storage in industrial, military, and medical systems where UV erasability and long-term data retention (>20 years) are critical.

FAQ

What UV wavelength and exposure dose are required to fully erase the M27C1001-12F1?

The M27C1001-12F1 requires short-wave ultraviolet light at 2537 Å wavelength with a minimum integrated dose of 15 W·s/cm². Using a standard 12,000 µW/cm² UV lamp, erasure is complete in 15–20 minutes at ≤2.5 cm distance. Sunlight or fluorescent lighting may cause partial erasure over months or years and must be blocked with opaque labels.

Can the M27C1001-12F1 be programmed with standard 5 V logic levels?

No. Programming requires three distinct voltage domains: VPP = 12.75 V ±0.25 V, VCC = 6.25 V ±0.25 V, and A9 = 11.5–12.5 V (VID) during electronic signature. Standard 5 V logic drivers cannot supply these levels; a dedicated EPROM programmer with isolated VPP generation and VID control is mandatory.

Is the FDIP32W package RoHS compliant?

The M27C1001-12F1 FDIP32W package contains leaded solder in its ceramic-to-metal seal and is not RoHS compliant. It was manufactured prior to 2006 and falls under RoHS exemption 7a (high-melting-temperature type solders). For RoHS-compliant alternatives, consider OTP versions in PLCC32 or TSOP32 packages, which omit the UV window and use lead-free terminations.

How does the two-line control (E and G) reduce power consumption in memory arrays?

When E is high (CMOS VIH), the M27C1001-12F1 enters standby mode drawing only 100 µA - independent of G state. By decoding E per device and tying G to a common system READ line, all deselected chips enter ultra-low-power standby while only the selected chip drives outputs, cutting total array active current by >95% compared to single-enable architectures.

M27C1001-12F1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-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:: 1Mbit

Memory Organization:: 128K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 120 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-CDIP Frit Seal with Window

M27C1001-12F1 FAQ

1.How can I place an order for M27C1001-12F1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C1001-12F1 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 M27C1001-12F1 reliable?

The price and inventory of M27C1001-12F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C1001-12F1 is usually 5 days.

3.What payment methods are accepted for M27C1001-12F1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C1001-12F1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C1001-12F1?

M27C1001-12F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C1001-12F1 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 M27C1001-12F1?

For technical support, including M27C1001-12F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C1001-12F1 requirements.

6.How does Aetrix verify that M27C1001-12F1 is sourced from the original manufacturer or authorized distributors?

All M27C1001-12F1 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 M27C1001-12F1 meets industry standards.

7.What is the process for return or replacement of M27C1001-12F1?

All M27C1001-12F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C1001-12F1, 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 M27C1001-12F1 part is unused and in its original packaging.

Return procedure for M27C1001-12F1:

1.Submit a request within 90 days.

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

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