Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics M27C512-45XF1

Name: M27C512-45XF1
Brand: STMicroelectronics
SKU: M27C512-45XF1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: M27C512-45XF1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 28-CDIP (0.600", 15.24mm) Window

Datasheet:: M27C512-45XF1.pdf

Description:: IC EPROM 512KBIT PARALLEL 28CDIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,131

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

M27C512-45XF1 from STMicroelectronics is a 512 Kbit (64K × 8) UV-erasable EPROM in FDIP28W ceramic frit-seal package with transparent window, featuring 45 ns access time, 5 V ±10% read supply, 30 mA active current, 100 µA standby current, and 12.75 V ±0.25 V programming voltage - used for firmware storage in legacy industrial controllers requiring field-erasable nonvolatile memory.

For engineers reviewing the M27C512-45XF1 datasheet, M27C512-45XF1 pinout, M27C512-45XF1 application, or M27C512-45XF1 equivalent, this page delivers verified timing specs, UV erasure guidance, two-line output control implementation, and ECOPACK® lead-free compliance details essential for legacy system maintenance and replacement design.

Technical Context

The M27C512-45XF1 operates in three primary modes: Read (E and G low), Standby (E high), and Programming (E pulsed low with GVPP = 12.75 V). Its dual-control architecture uses Chip Enable (E) for device selection and Output Enable (G) for bus gating to minimize contention in multi-chip memory arrays.

It supports PRESTO IIB programming with ~6 s typical write time and margin-mode verification at 6.25 V VCC; electronic signature (20h manufacturer code, 3Dh device code) enables automatic programmer identification via A9 voltage forcing and A0 toggling.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	512 Kbit (64K × 8) - supports full 16-bit address bus with byte-wide data interface for 8-bit microcontroller systems.
Access Time	45 ns - ensures compatibility with 22 MHz Z80 or 8086-based systems requiring fast instruction fetch from ROM.
Read Supply	5 V ±10% - operates directly from standard TTL/CMOS logic rails without auxiliary regulators.
Standby Current	100 µA - enables low-power retention in battery-backed embedded controllers during sleep cycles.
Programming Voltage	12.75 V ±0.25 V - requires dedicated HV supply rail; not compatible with 5 V-only programmers.
UV Erase Dose	≥15 W·s/cm² at 2537 Å - mandates 15–20 min exposure under unfiltered short-wave UV lamp at ≤2.5 cm distance.
Operating Temp	–40 °C to +125 °C - qualified for extended-temperature industrial environments including motor drive firmware storage.

Pinout & Package

FDIP28W: 28-pin ceramic dual in-line package with UV-transparent quartz window; hermetically sealed via frit-glass bonding; lead-free ECOPACK® compliant; JEDEC MS-011AC outline; 36.5–37.3 mm length, 15.2 mm width, 5.7 mm height.

Pin/Terminal	Circuit Role	Design Meaning
A0–A15	Address Inputs	16-bit address bus interface; A9 used for Electronic Signature voltage forcing (11.5–12.5 V) during ID read.
Q0–Q7	Data Outputs	Bi-directional data bus pins - output only in Read/Verify; high-impedance in Standby/Program Inhibit.
E	Chip Enable	Active-low device select; high level places device in 100 µA standby; pulsed low initiates programming.
G (GVPP)	Output Enable / Program Supply	Low enables outputs in Read mode; driven to 12.75 V during programming to enable internal HV circuitry.
VCC	Supply Voltage	+5 V read supply; must be applied simultaneously with or before VPP and removed after VPP per reliability spec.
VSS	Ground	Reference for all logic and programming signals; requires local 0.1 µF ceramic decoupling per device.
NC	No Connect	Pins 9 and 25 are internally unconnected - must remain floating or tied to ground per layout guidelines.
DU	Do Not Use	Pins 1 and 32 are reserved for test; not bonded - avoid routing or soldering.

Key Features

Feature	Design Value
Two-line output control (E + G)	Enables zero-bus-contention memory expansion by independently gating power (E) and output drivers (G).
Electronic Signature	Manufacturer (20h) and device (3Dh) codes readable via A9 voltage forcing - ensures auto-algorithm selection in universal programmers.
PRESTO IIB programming	Guarantees full array programming in ≤6.5 s with built-in margin verification - eliminates over-programming wear.
ECOPACK® compliance	Lead-free ceramic package meeting JEDEC JESD97 second-level interconnect marking - supports RoHS-compliant legacy rework.
UV erasability	Quartz window allows full bit-pattern erasure in 15–20 min using 2537 Å UV source - enables firmware iteration without device replacement.

Applications

Industrial PLC Firmware Storage

Avionics Boot ROM

Use Scenario: Storing ladder logic interpreter and I/O mapping tables in DIN-rail mounted programmable logic controllers operating in factory-floor environments with wide temperature swings.

IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; 45 ns access satisfies 22 MHz Z80 bus timing with tAVQV ≤ 45 ns.

Use Value: UV erasability permits on-site firmware updates after hardware revisions without PCB rework or component replacement.

Use Scenario: Holding boot loader and configuration data for flight-critical microcontrollers in certified avionics subsystems where long-term data retention and radiation tolerance are mandatory.

IC Role / Device Role / Timing Role: Primary boot ROM accessed during cold start; -40 °C to +125 °C rating ensures operation across cabin-to-stratosphere thermal profiles.

Use Value: Ceramic FDIP28W package provides hermetic sealing and superior moisture resistance versus plastic alternatives - critical for 20+ year service life.

Medical Imaging System BIOS

Legacy Test Equipment Calibration Data

Use Scenario: Storing FPGA configuration bitstreams and sensor calibration coefficients in ultrasound and MRI front-end modules subject to strict regulatory traceability requirements.

IC Role / Device Role / Timing Role: Static memory holding immutable startup code; 100 µA standby current minimizes power draw during idle periods between imaging sessions.

Use Value: Electronic Signature enables automated verification of correct part installation during manufacturing test - preventing field failures from counterfeit or mislabeled devices.

Use Scenario: Retaining instrument-specific calibration constants and self-test routines in benchtop oscilloscopes and spectrum analyzers deployed in metrology labs for >15 years.

IC Role / Device Role / Timing Role: OTP/UV EPROM used for permanent calibration storage; FDIP28W window allows lab technicians to erase and reload updated coefficients post-calibration.

Use Value: 12.75 V programming voltage and PRESTO IIB algorithm ensure reliable one-time writes even after decades of shelf storage - no charge leakage degradation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C512-45DC	45 ns access, 28-pin PDIP, 5 V read, but lacks UV window - OTP-only; no erasure capability.	Suitable only for fixed-firmware deployments where field updates are unnecessary.	Select when cost sensitivity outweighs need for reprogrammability; verify board footprint compatibility (PDIP vs FDIP).
MX27C512PC-45	45 ns access, 28-pin PDIP, same 5 V/12.75 V electricals, but uses plastic package - no UV erasure support.	Compatible with same socket but requires device replacement for firmware changes.	Choose for high-volume production where UV window adds cost/complexity and firmware is truly one-time.

Compared with AM27C512-45DC and MX27C512PC-45, the M27C512-45XF1 uniquely supports field-erasable firmware updates via its quartz window, enabling lifecycle extension of legacy equipment without hardware redesign - a decisive advantage for maintenance-intensive industrial and medical systems.

Availability

M27C512-45XF1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, avionics boot ROM, and medical imaging BIOS requiring stable component supply across extended product lifecycles.

Supply support for M27C512-45XF1 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, designing and manufacturing analog, MCU, power, and memory products for industrial, automotive, and consumer markets.

The M27C512 belongs to ST's legacy EPROM family targeting long-lifecycle embedded systems where UV-erasability, wide temperature operation, and proven reliability supersede density or speed - optimized for firmware storage in mission-critical infrastructure.

FAQ

What UV wavelength and exposure time are required to fully erase the M27C512-45XF1?

The M27C512-45XF1 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 takes 15–20 minutes at ≤2.5 cm distance. Direct sunlight may cause partial erasure in ~1 week; fluorescent lighting can erase over ~3 years - opaque window labels are recommended for long-term storage.

Can the M27C512-45XF1 be programmed with a modern 5 V-only EPROM programmer?

No. The M27C512-45XF1 requires a dedicated 12.75 V ±0.25 V programming voltage on the GVPP pin and 6.25 V ±0.25 V on VCC during programming - incompatible with 5 V-only programmers. It also needs PRESTO IIB or standard algorithm support and A9 voltage forcing (11.5–12.5 V) for electronic signature verification.

Is the FDIP28W package of the M27C512-45XF1 RoHS-compliant?

Yes. The FDIP28W package is ST's ECOPACK® variant: lead-free, with JEDEC JESD97 second-level interconnect marking on both package and inner box label. It meets RoHS Directive 2011/65/EU and is suitable for new designs requiring environmental compliance, though it remains a legacy ceramic construction.

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

By separating Chip Enable (E) and Output Enable (G), deselected devices enter 100 µA standby mode (E high) while G remains shared across all chips. Only the selected device drives the bus (E low + G low), eliminating contention and reducing total active current - critical for large memory banks where cumulative ICC would otherwise exceed supply limits.

M27C512-45XF1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 28-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:: 512Kbit

Memory Organization:: 64K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 45 ns

Voltage - Supply:: 4.75V ~ 5.25V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 28-CDIP Frit Seal with Window

M27C512-45XF1 FAQ

1.How can I place an order for M27C512-45XF1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C512-45XF1 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 M27C512-45XF1 reliable?

The price and inventory of M27C512-45XF1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C512-45XF1 is usually 5 days.

3.What payment methods are accepted for M27C512-45XF1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C512-45XF1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C512-45XF1?

M27C512-45XF1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C512-45XF1 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 M27C512-45XF1?

For technical support, including M27C512-45XF1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C512-45XF1 requirements.

6.How does Aetrix verify that M27C512-45XF1 is sourced from the original manufacturer or authorized distributors?

All M27C512-45XF1 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 M27C512-45XF1 meets industry standards.

7.What is the process for return or replacement of M27C512-45XF1?

All M27C512-45XF1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C512-45XF1, 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 M27C512-45XF1 part is unused and in its original packaging.

Return procedure for M27C512-45XF1:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…