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

STMicroelectronics M27C1001-12B1

Name: M27C1001-12B1
Brand: STMicroelectronics
SKU: M27C1001-12B1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C1001-12B1

Manufacturer:: STMicroelectronics

Category:: Memory

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

Datasheet:: M27C1001-12B1.pdf

Description:: IC EPROM 1MBIT PARALLEL 32DIP

Quantity:: RFQ Add To RFQ list

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Inventory:2,881

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Product details

Overview

M27C1001-12B1 from STMicroelectronics is a 1 Mbit (131,072 × 8) UV-erasable EPROM in PDIP32 package, operating at 5V ±10%, with 35 ns access time and 30 mA active current at 5 MHz. It features dual-line control (E/G), electronic signature (20h/05h), and supports programming at 12.75 V with 100 µs/word pulse width. It is used in legacy microprocessor systems for firmware storage where field reprogrammability via UV erasure is required.

For engineers reviewing the M27C1001-12B1 datasheet, M27C1001-12B1 pinout, M27C1001-12B1 application, or M27C1001-12B1 equivalent, key selection criteria include UV-erase capability, TTL-compatible timing, 35 ns read access, dual enable control architecture, and compatibility with PRESTO II programming algorithms.

Technical Context

The M27C1001-12B1 implements a two-control-line memory interface: Chip Enable (E) governs power state and device selection, while Output Enable (G) independently gates output drivers-enabling low-power standby (100 µA) and eliminating bus contention in multi-device arrays. Its internal architecture supports both standard read mode and dedicated programming/verify modes with separate VPP (12.75 V) and VCC (6.25 V) supply rails.

Electronic signature mode uses A9 voltage (11.5–12.5 V) to trigger manufacturer/device code readout on Q7–Q0, enabling automatic algorithm matching in programmers. Erasure requires UV exposure (2537 Å, ≥15 W·s/cm²), with FDIP/LCCC variants featuring transparent lids; the -12B1 variant (PDIP32) is OTP-only and lacks UV window.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1 Mbit (131,072 words × 8 bits) - supports full 16-bit address space with A0–A16 addressing
Access Time	35 ns - defines maximum clock-to-data delay in read mode under high-speed AC conditions
Supply Voltage	5 V ±10% - compatible with legacy TTL/CMOS logic rails; VPP = 12.75 V ±0.25 V for programming
Active Current	30 mA at 5 MHz - determines decoupling requirements (0.1 µF ceramic per device)
Standby Current	100 µA - achieved when E = VIH; enables low-power retention in idle memory subsystems
Programming Time	100 µs/word - fixed pulse width for PRESTO II algorithm; verified under 6.25 V VCC and 12.75 V VPP
Operating Temp	–40 °C to 125 °C - qualified for industrial and extended-temperature embedded control applications

Pinout & Package

Package: PDIP32 (Plastic Dual In-line Package, 600 mil width, no UV window - OTP configuration). Pin count: 32. Pin 1 index marker located at top-left corner when notch faces upward.

Pin/Terminal	Circuit Role	Design Meaning
A0–A16	Address Inputs	17-bit address bus; fully decoded to select one of 131,072 locations; A9 used for electronic signature voltage sensing
Q0–Q7	Data Outputs	8-bit bidirectional data bus during programming (data-in) and read/verify (data-out); TTL-compatible levels
E	Chip Enable	Primary device-select signal; TTL/CMOS-compatible; drives device into 100 µA standby when high
G	Output Enable	Secondary output gate; independent of E; controls Hi-Z vs. driven state of Q0–Q7
P	Program Control	Active-low programming strobe; must be pulsed low with E = VIL and VPP = 12.75 V to initiate write cycle
VPP	Programming Supply	Dedicated 12.75 V input; must be applied simultaneously with or after VCC and removed before or with VCC
VCC	Supply Voltage	5 V ±10% for read; 6.25 V ±0.25 V for programming - strict sequencing required to prevent latch-up
VSS	Ground	Reference return for all signals; requires low-inductance connection to support transient current peaks
NC	No Connect	Pin 17 (per Figure 2A) - internally unconnected; must remain floating or grounded per board layout rules

Key Features

Feature	Design Value
Dual-line output control (E + G)	Enables zero-bus-contention memory expansion and reduces system power by placing deselected devices in 100 µA standby
PRESTO II programming algorithm	Guarantees full-array programming in ~13 s with margin verification - eliminates overprogramming and cell wear
Electronic signature (20h/05h)	Allows automatic device identification in programming hardware - prevents mismatched algorithms and programming failures
UV-erasable architecture (in windowed packages)	Supports unlimited reprogramming cycles via 2537 Å UV exposure (15–20 min at 12,000 µW/cm²); -12B1 is OTP variant
Industrial temperature range	Rated for –40 °C to 125 °C operation - suitable for engine control units, industrial PLCs, and telecom line cards

Applications

Automotive Engine Control Unit (ECU)

Industrial Programmable Logic Controller (PLC)

Use Scenario: Storing calibrated fuel injection maps and diagnostic routines in legacy ECU designs prior to flash memory adoption.

IC Role / Device Role / Timing Role: Non-volatile program memory mapped to CPU address space; accessed via synchronous 35 ns read cycles during instruction fetch.

Use Value: UV-erasability enabled field updates using portable UV erasers; OTP version (-12B1) provided cost-optimized, tamper-resistant firmware storage.

Use Scenario: Holding ladder logic firmware and I/O configuration tables in DIN-rail mounted PLCs deployed in factory automation.

IC Role / Device Role / Timing Role: Static memory peripheral interfaced to 8-bit microcontroller bus; E/G control synchronized to bus arbitration signals.

Use Value: Dual enable lines prevented bus conflicts across multiple memory banks; 125 °C rating ensured reliability inside sealed control cabinets.

Telecom Line Card Boot ROM

Avionics Maintenance Diagnostic Module

Use Scenario: Storing boot loader and hardware initialization code for T1/E1 interface cards in central office switches.

IC Role / Device Role / Timing Role: Memory-mapped boot device activated at power-on reset; accessed with strict 35 ns tAVQV timing to meet boot latency budgets.

Use Value: 5 V ±10% tolerance accommodated aging power supplies; electronic signature confirmed correct part insertion during automated test.

Use Scenario: Retaining aircraft-specific calibration constants and fault-tree logic in portable ground-test equipment used on Boeing 737 maintenance bays.

IC Role / Device Role / Timing Role: Read-only configuration store accessed via discrete address decoder; standby current <100 µA extended battery life during field use.

Use Value: Industrial temp rating ensured operation in hangar environments ranging from –20 °C to 55 °C; PDIP32 package enabled hand-soldering and rework.

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
AM27C1001-35DC	Same 1 Mbit ×8 organization, 35 ns access, 5 V supply; manufactured by AMD; identical pinout and AC/DC specs	Validated in same legacy telecom and industrial designs; shares identical PRESTO II programming flow	Select when STMicroelectronics supply continuity is constrained; requires same UV eraser or OTP handling
MX27C1001-35PC	Macronix variant; matches speed, voltage, and pinout; minor differences in programming verify margin thresholds	Used in automotive instrument clusters where alternate sourcing was mandated by Tier-1 procurement policy	Prefer for cost-sensitive industrial OEMs; verify margin mode behavior with existing programmer firmware

Compared with AM27C1001-35DC and MX27C1001-35PC, the M27C1001-12B1 offers identical timing and electrical interoperability but differs in electronic signature codes (20h/05h vs. AMD's 01h/05h and Macronix's 32h/05h), requiring programmer algorithm updates for automatic detection.

Availability

M27C1001-12B1 is available at Aetrix Electronics and suitable for automotive ECU firmware, industrial PLC configuration storage, and telecom line card boot ROM applications requiring stable component supply across long-lifecycle programs.

Supply support for M27C1001-12B1 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, and non-volatile memory solutions for industrial, automotive, and consumer markets.

The M27C1001 belongs to ST's legacy EPROM product line, designed specifically for high-reliability, long-lifecycle embedded systems requiring field-erasable or one-time-programmable firmware storage in harsh environments.

FAQ

Is M27C1001-12B1 UV-erasable?

No. The "B" suffix denotes PDIP32 packaging without a quartz window, making it OTP-only. UV erasure requires FDIP32W or LCCC32W packages (suffixes "F" or "L"). The -12B1 variant is programmed once and retains data indefinitely unless exposed to intense UV light unintentionally.

What is the correct power sequencing for programming?

VCC must be applied simultaneously with or before VPP, and removed simultaneously or after VPP. During programming, VCC = 6.25 V ±0.25 V and VPP = 12.75 V ±0.25 V. Violating this sequence risks permanent damage due to internal latch-up, as specified in Table 9 and Table 10 footnotes.

Can M27C1001-12B1 be used in a 3.3 V system?

No. It requires 5 V ±10% for read operations and 6.25 V for programming. Input thresholds (VIH = 2 V, VIL = 0.8 V) are TTL-compatible but not 3.3 V logic-safe. Interfacing with 3.3 V controllers requires level-shifting on all address, data, and control lines to avoid exceeding absolute maximum ratings.

How is electronic signature read, and why does it matter?

Apply 11.5–12.5 V to A9 while holding VPP = VCC = 5 V and toggling A0. Q7–Q0 outputs manufacturer code (20h) on A0 = low, then device code (05h) on A0 = high. This enables programming tools to auto-detect part identity and load correct algorithms-critical for avoiding misprogramming in mixed-BOM production lines.

M27C1001-12B1 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:: 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-PDIP

M27C1001-12B1 FAQ

1.How can I place an order for M27C1001-12B1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C1001-12B1 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 M27C1001-12B1 reliable?

The price and inventory of M27C1001-12B1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C1001-12B1 is usually 5 days.

3.What payment methods are accepted for M27C1001-12B1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C1001-12B1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C1001-12B1?

M27C1001-12B1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C1001-12B1 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 M27C1001-12B1?

For technical support, including M27C1001-12B1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C1001-12B1 requirements.

6.How does Aetrix verify that M27C1001-12B1 is sourced from the original manufacturer or authorized distributors?

All M27C1001-12B1 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 M27C1001-12B1 meets industry standards.

7.What is the process for return or replacement of M27C1001-12B1?

All M27C1001-12B1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C1001-12B1, 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 M27C1001-12B1 part is unused and in its original packaging.

Return procedure for M27C1001-12B1:

1.Submit a request within 90 days.

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

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