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STMicroelectronics M27C64A-10F1

Name: M27C64A-10F1
Brand: STMicroelectronics
SKU: M27C64A-10F1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M27C64A-10F1

Manufacturer:: STMicroelectronics

Category:: Memory

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

Datasheet:: M27C64A-10F1.pdf

Description:: IC EPROM 64KBIT PARALLEL 28CDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M27C64A-10F1 from STMicroelectronics is a 64 Kbit (8K × 8) UV-erasable EPROM in FDIP28W ceramic window package, featuring 100 ns access time, 5V ±10% read supply, active current of 30 mA, standby current of 100 µA, and 12.5V programming voltage - used for firmware storage in legacy microprocessor systems requiring field-erasable non-volatile code retention.

For engineers reviewing the M27C64A-10F1 datasheet, M27C64A-10F1 pinout, M27C64A-10F1 application, or M27C64A-10F1 equivalent, key selection considerations include UV erasure capability, two-line output control (E/G), TTL-compatible I/O, electronic signature (9Bh/08h), and compatibility with standard EPROM programmers supporting 12.5V VPP and A9-based signature read.

Technical Context

The M27C64A-10F1 implements a classic NMOS-derived EPROM architecture with dual active-low chip enable (E) and output enable (G) controls, enabling low-power standby (100 µA) and bus contention avoidance in multi-device memory arrays. Its logic diagram confirms full address decoding across A0–A12 and parallel 8-bit data I/O on Q0–Q7.

Programming requires precise 12.5V ±0.25V on VPP, 6V ±0.25V on VCC, and pulsed low on P while E is low; verification occurs under same VPP/VCC with P high. Electronic signature mode uses 11.5–12.5V on A9 to return manufacturer code 9Bh and device code 08h on Q7–Q0.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	64 Kbit (8,192 × 8), fixed parallel organization - supports byte-wide data bus interfacing without external demultiplexing.
Access Time	100 ns max (tAVQV) at 5V - meets timing requirements for 8-bit microprocessors like Z80, 8085, and 6502 running ≤10 MHz.
Read Supply	5V ±10% (VCC), no separate VPP required during read - simplifies power design versus flash or EEPROM.
Standby Current	100 µA (CMOS-level) when E = VIH - enables low-quiescent power in battery-backed or idle-state systems.
Programming Voltage	VPP = 12.5V ±0.25V - requires dedicated high-voltage programmer circuitry; not compatible with 5V-only programming tools.
Electronic Signature	Manufacturer Code 9Bh, Device Code 08h via A9 high-voltage trigger - enables automatic algorithm selection in universal EPROM programmers.
Erasure Method	UV light (2537 Å, ≥15 W·sec/cm², 15–20 min) through ceramic window - mandates physical exposure; no electrical erase capability.

Pinout & Package

FDIP28W: 28-pin ceramic dual in-line package with UV-transparent quartz window, frit-seal construction, and 0.6-inch body width - designed for long-term data retention and repeatable UV erasure cycles.

Pin/Terminal	Circuit Role	Design Meaning
A0–A12	Address Inputs	13-bit address bus (0–8191); fully decoded internally - no external address latching needed for byte-wide access.
Q0–Q7	Data I/O	Bi-directional 8-bit data bus; outputs driven during read/verify, inputs sampled during programming - shares pins for compact layout.
E	Chip Enable	Primary device select; CMOS-high (≥VCC–0.2V) places device in 100 µA standby - enables power gating in memory banks.
G	Output Enable	Secondary output gate; independent of E - allows shared G line across multiple devices to prevent bus contention.
P	Program Control	Active-low pulse input; initiates programming cycle only when VPP = 12.5V and E = low - prevents accidental writes.
VPP	Programming Supply	12.5V ±0.25V input; must be applied before/with VCC and removed after - strict sequencing prevents latch-up or cell damage.
VCC	Supply Voltage	5V ±10% for read; 6V ±0.25V for programming - dual-voltage operation requires programmable power rail or manual switching.
VSS	Ground	Reference for all signals; decoupling requires 0.1 µF ceramic cap per device placed adjacent to pin - critical for transient noise suppression.
A9	Signature Trigger	High-voltage (11.5–12.5V) input to enter Electronic Signature mode - not used in normal operation; requires isolated driver circuitry.
NC / DU	No Connect / Don't Use	Pins 1, 14, 25 (DIP) marked NC/DU - must remain unconnected; floating or driven states may cause undefined behavior.

Key Features

Feature	Design Value
Two-Line Output Control (E + G)	Enables hierarchical memory banking: E selects device (power gating), G gates outputs (bus arbitration) - eliminates need for external tri-state logic.
UV Erasability with Ceramic Window	FDIP28W package allows >100 full-erase cycles using standard 2537 Å UV lamps - supports iterative firmware development in lab environments.
Electronic Signature (9Bh/08h)	Enables auto-detection in programming hardware - eliminates manual part selection and reduces operator error during production programming.
High-Speed Programming (<1 min)	Verified algorithm with 1 ms initial pulse and adaptive over-program pulses - achieves >99.9% bit accuracy without external verification hardware.
ECOPACK® Lead-Free Option	Meets JEDEC JESD97 marking standards; RoHS-compliant finish available - satisfies environmental compliance for industrial and telecom deployments.

Applications

Industrial PLC Firmware Storage

Legacy Automotive ECU Boot Code

Use Scenario: Storing ladder logic interpreter and I/O mapping tables in programmable logic controllers deployed in factory automation cabinets.

IC Role / Device Role / Timing Role: Non-volatile program memory mapped to CPU address space; accessed via 8-bit data bus with 100 ns tAVQV timing alignment.

Use Value: UV erasability allows field updates using portable UV erasers; ceramic package withstands 85°C cabinet temperatures and vibration.

Use Scenario: Holding boot ROM code for 8051-based engine control units in pre-OBD-II vehicles, where firmware rarely changes post-production.

IC Role / Device Role / Timing Role: Read-only instruction store executing at CPU clock rates up to 12 MHz; relies on tGLQV ≤50 ns for tight OE-controlled fetch timing.

Use Value: 100 µA standby current extends battery backup life during vehicle off-state; ECOPACK variant complies with EU automotive recycling directives.

Military Radio Configuration Memory

Medical Instrument Calibration Data

Use Scenario: Storing frequency-hopping tables and encryption keys in manpack radios operating in extended temperature ranges (–40°C to +85°C).

IC Role / Device Role / Timing Role: Secure, tamper-resistant storage accessed only during initialization; verified via electronic signature before loading.

Use Value: UV window permits secure re-keying in controlled facilities; 125°C bias rating ensures reliability under sustained RF power dissipation.

Use Scenario: Retaining sensor calibration coefficients and safety-critical fault thresholds in portable ultrasound and ECG devices.

IC Role / Device Role / Timing Role: Static configuration memory read once at power-on; accessed with E-gated enable to isolate during analog signal acquisition.

Use Value: 0.1 µF local decoupling suppresses switching noise coupling into analog front-end; lead-free ECOPACK meets IEC 60601-1 biocompatibility requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C64A-120DC	120 ns access time, 5V-only programming (no VPP), plastic DIP package - lacks UV window and requires different programmer voltage profile.	Used in cost-sensitive consumer electronics where field erasure is unnecessary and PCB space favors plastic packaging.	Select only if UV erasure is not required and existing programming infrastructure supports 5V-only write cycles.
MX27C640-12PC	120 ns access, 12.5V VPP, but PLCC32 package - no UV window; OTP-only version; higher pin count increases board area and socket cost.	Suitable for surface-mount production where rework is impractical and firmware is finalized prior to assembly.	Choose for SMT manufacturing flow; avoid if field firmware updates or UV-based reprogramming are needed.

Compared with AM27C64A-120DC and MX27C640-12PC, the M27C64A-10F1 uniquely combines 100 ns speed, UV erasability, and ceramic DIP robustness - making it irreplaceable for lab-based firmware iteration and high-reliability embedded systems requiring verified field updates.

Availability

M27C64A-10F1 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot code, and military radio configuration memory requiring stable component supply across extended product lifecycles.

Supply support for M27C64A-10F1 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 microcontrollers, power ICs, sensors, and memory products for industrial, automotive, and consumer markets.

The M27C64A belongs to ST's legacy EPROM product line, engineered specifically for reliable, field-erasable firmware storage in microprocessor-based systems where electrical rewrite endurance is not required but long-term data integrity and UV-based update flexibility are critical.

FAQ

What UV wavelength and exposure time are required to fully erase the M27C64A-10F1?

Full erasure requires short-wave ultraviolet light at 2537 Å with a minimum integrated dose of 15 W·sec/cm². Using a standard 12,000 µW/cm² UV lamp, place the device within 2.5 cm of the source for 15–20 minutes. Room fluorescent lighting may cause partial erasure over years; direct sunlight can erase it in ~1 week - opaque window labels are recommended for long-term storage.

Can the M27C64A-10F1 be programmed with a modern USB EPROM programmer?

Yes, but only if the programmer supports 12.5V VPP generation, precise 6V VCC during programming, A9 high-voltage signature mode (11.5–12.5V), and the ST-specific programming algorithm with 1 ms initial pulse and adaptive over-program cycles. Generic 5V-only programmers will not function - verify compatibility with the ST M27C64A programming specification before use.

Is the FDIP28W package RoHS-compliant?

Yes - ST offers the M27C64A-10F1 in ECOPACK® variants that are lead-free and comply with JEDEC Standard JESD97. The inner box label and package marking indicate the second-level interconnect category. Always confirm the specific ordering code (e.g., M27C64A-10F1TR) includes the ECOPACK designation when sourcing for RoHS-constrained applications.

Why does the M27C64A-10F1 require both E and G control lines instead of just one chip select?

The dual-control architecture separates power management (E) from bus arbitration (G): E places the device in 100 µA standby when high, reducing system power; G independently enables outputs without affecting power state. This prevents bus contention in multi-chip memory banks and allows shared G lines across devices - a design essential for clean 8-bit microprocessor bus interfacing without external logic.

M27C64A-10F1 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:: 64Kbit

Memory Organization:: 8K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 100 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

M27C64A-10F1 FAQ

1.How can I place an order for M27C64A-10F1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M27C64A-10F1 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 M27C64A-10F1 reliable?

The price and inventory of M27C64A-10F1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M27C64A-10F1 is usually 5 days.

3.What payment methods are accepted for M27C64A-10F1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M27C64A-10F1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M27C64A-10F1?

M27C64A-10F1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M27C64A-10F1 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 M27C64A-10F1?

For technical support, including M27C64A-10F1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M27C64A-10F1 requirements.

6.How does Aetrix verify that M27C64A-10F1 is sourced from the original manufacturer or authorized distributors?

All M27C64A-10F1 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 M27C64A-10F1 meets industry standards.

7.What is the process for return or replacement of M27C64A-10F1?

All M27C64A-10F1 units undergo pre-shipment inspection (PSI). If there is an issue with M27C64A-10F1, 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 M27C64A-10F1 part is unused and in its original packaging.

Return procedure for M27C64A-10F1:

1.Submit a request within 90 days.

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

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