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

Microchip Technology AT27C512R-15RC

Name: AT27C512R-15RC
Brand: Microchip Technology
SKU: AT27C512R-15RC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT27C512R-15RC

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 28-SOIC (0.342", 8.69mm Width)

Datasheet:: AT27C512R-15RC.pdf

Description:: IC EPROM 512KBIT PARALLEL 28SOIC

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Product details

Overview

AT27C512R-15RC from Microchip Technology (formerly Atmel) is a 512 Kbit one-time programmable EPROM organized as 64K × 8, operating from a single 5V ±10% supply with 45 ns read access time, 100 µA max standby current, and JEDEC-standard 28-lead SOIC package - used for firmware storage in microprocessor-based industrial controllers where non-volatility and bus-contention-free two-line control (CE/OE) are required.

For engineers reviewing the AT27C512R-15RC datasheet, AT27C512R-15RC pinout, AT27C512R-15RC application, or AT27C512R-15RC equivalent, key selection criteria include verified 45 ns tACC timing grade, SOIC-28 package compatibility, OTP reliability for unchangeable boot code, and Rapid™ programming at 100 µs/byte under 13 V VPP.

Technical Context

The AT27C512R-15RC implements a CMOS-based OTP EPROM architecture with dual-control logic (CE and OE/VPP), enabling high-impedance output disable and eliminating bus contention during memory-mapped I/O operations. Its address decoding covers A0–A15 (16-bit), supporting full 64K-byte random access without wait states.

Programming uses a dedicated 13.0 V ±0.25 V VPP applied to the OE/VPP pin while CE is pulsed at 95–105 µs width; the integrated Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x0D) enables automatic algorithm selection in industry-standard programmers.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	524,288 bits (64K × 8) - supports full firmware image storage for 8-bit microcontrollers without external banking logic.
Read Access Time (tACC)	45 ns - ensures zero-wait-state operation with 22 MHz Z80, 8051, or 68K-class processors.
VCC Supply	5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode.
Standby Current (ISB1)	100 µA max - enables low-power retention in battery-backed systems or sleep-mode embedded hosts.
Active Current (ICC)	20 mA max at 5 MHz - supports sustained burst reads without thermal derating in compact PCB layouts.
ESD Protection	2,000 V HBM - meets industrial handling requirements per ANSI/ESDA/JEDEC JS-001.
Latchup Immunity	200 mA - prevents destructive latchup during transient overvoltage events on address/data lines.

Pinout & Package

AT27C512R-15RC is supplied in a 28-lead plastic gull-wing small outline integrated circuit (SOIC) package per JEDEC MS-012, 0.330" wide body, with 1.27 mm lead pitch and surface-mount footprint.

Pin/Terminal	Circuit Role	Design Meaning
A0–A15	Address Inputs	16-bit binary address bus; fully decoded to select one of 65,536 bytes without external demultiplexing.
O0–O7	Data Outputs	True TTL/CMOS-compatible bidirectional data bus; high-impedance when CE=VIH or OE/VPP=VIH.
CE	Chip Enable	Primary device select; active-low; must be stable before address setup to meet tAS timing.
OE/VPP	Output Enable / Programming Voltage	Dual-function pin: low for read enable; 13 V for programming; internal level-shifting isolates VPP from I/O pins.
GND	Ground Reference	Signal and power return; requires local 0.1 µF ceramic decoupling per device per datasheet Section 2.
VCC	Power Supply	+5 V ±10% supply; must be applied simultaneously with or before OE/VPP to prevent latchup.

Key Features

Feature	Design Value
Rapid™ Programming Algorithm	100 µs/byte typical - reduces production programming time by >5× vs. legacy EPROMs, with auto-retry up to 10 pulses per byte.
Integrated Product ID Code	Manufacturer ID = 0x1E, Device ID = 0x0D - enables plug-and-play recognition in automated programming stations without manual part selection.
Two-Line Control Architecture	Independent CE and OE/VPP inputs - allows flexible bus arbitration: CE disables chip entirely; OE/VPP controls output drivers only.
JEDEC-Standard Packaging	SOIC-28 (28R), PDIP-28 (28P6), PLCC-32 (32J), TSOP-28 (28T) - ensures drop-in replacement across form factors without redesign.
Temperature Ranges	Commercial (0°C to 70°C), Industrial (−40°C to +85°C), Automotive (−40°C to +125°C) - validated operation across extended thermal profiles.

Applications

Industrial PLC Firmware Storage	Legacy Embedded Boot ROM
Use Scenario: Storing fixed ladder-logic execution firmware in DIN-rail mounted programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; provides deterministic 45 ns instruction fetch latency to sustain real-time scan cycles. Use Value: Eliminates reliance on external EEPROM or Flash requiring wear-leveling or erase cycles; OTP guarantees firmware immutability against accidental overwrite or malware injection.	Use Scenario: Holding immutable BIOS or bootloader code in retro-computing hardware replicas (e.g., CP/M systems, vintage arcade boards) where field updates are prohibited. IC Role / Device Role / Timing Role: Primary read-only instruction store; accessed via 8-bit data bus and 16-bit address bus with CE/OE-controlled tristate outputs. Use Value: Matches original design timing (45 ns tACC) and pinout, enabling authentic restoration without timing adapter logic or PCB modification.
Automotive Instrument Cluster Memory	Medical Device Calibration Data
Use Scenario: Storing calibrated gauge scaling tables and UI graphics assets in automotive digital instrument clusters operating across −40°C to +125°C ambient. IC Role / Device Role / Timing Role: Static configuration memory accessed during startup; powered from vehicle's 5 V rail with no dynamic refresh needed. Use Value: Qualified for automotive temperature range with 200 mA latchup immunity - withstands load-dump transients and ESD events in harsh vehicle electrical environments.	Use Scenario: Retaining factory-calibrated sensor offset/gain coefficients in Class II medical infusion pumps where data integrity is safety-critical and field reprogramming is prohibited. IC Role / Device Role / Timing Role: Read-once calibration repository; accessed during power-up self-test sequence prior to therapy delivery. Use Value: OTP architecture prevents post-certification tampering; 2,000 V ESD rating ensures robustness during assembly and service handling per IEC 61326-1.

Industrial PLC Firmware Storage

Legacy Embedded Boot ROM

Use Scenario: Storing fixed ladder-logic execution firmware in DIN-rail mounted programmable logic controllers deployed in factory automation environments.

IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; provides deterministic 45 ns instruction fetch latency to sustain real-time scan cycles.

Use Value: Eliminates reliance on external EEPROM or Flash requiring wear-leveling or erase cycles; OTP guarantees firmware immutability against accidental overwrite or malware injection.

Use Scenario: Holding immutable BIOS or bootloader code in retro-computing hardware replicas (e.g., CP/M systems, vintage arcade boards) where field updates are prohibited.

IC Role / Device Role / Timing Role: Primary read-only instruction store; accessed via 8-bit data bus and 16-bit address bus with CE/OE-controlled tristate outputs.

Use Value: Matches original design timing (45 ns tACC) and pinout, enabling authentic restoration without timing adapter logic or PCB modification.

Automotive Instrument Cluster Memory

Medical Device Calibration Data

Use Scenario: Storing calibrated gauge scaling tables and UI graphics assets in automotive digital instrument clusters operating across −40°C to +125°C ambient.

IC Role / Device Role / Timing Role: Static configuration memory accessed during startup; powered from vehicle's 5 V rail with no dynamic refresh needed.

Use Value: Qualified for automotive temperature range with 200 mA latchup immunity - withstands load-dump transients and ESD events in harsh vehicle electrical environments.

Use Scenario: Retaining factory-calibrated sensor offset/gain coefficients in Class II medical infusion pumps where data integrity is safety-critical and field reprogramming is prohibited.

IC Role / Device Role / Timing Role: Read-once calibration repository; accessed during power-up self-test sequence prior to therapy delivery.

Use Value: OTP architecture prevents post-certification tampering; 2,000 V ESD rating ensures robustness during assembly and service handling per IEC 61326-1.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM27C512-15DC	Same 64K × 8 OTP EPROM, 45 ns access, but manufactured by AMD (now discontinued); requires identical 13 V VPP programming voltage.	No automotive qualification; only commercial/industrial temp grades available.	Select AM27C512-15DC only if legacy board designs specify AMD marking and SOIC-28 footprint is fixed.
MX27C512-15PC	Macronix OTP EPROM with same density, speed, and SOIC-28 package; 100 µA standby current matches AT27C512R-15RC.	Product ID code differs (0x1F/0x0D); may require programmer firmware update for auto-recognition.	Choose MX27C512-15PC when sourcing continuity is critical and ID-code-aware programming is not used.

Compared with AM27C512-15DC and MX27C512-15PC, the AT27C512R-15RC offers broader temperature support (including automotive), guaranteed Rapid™ programming compatibility, and documented 2,000 V ESD/200 mA latchup specs - making it preferred for new industrial and safety-critical designs.

Availability

AT27C512R-15RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, automotive instrument cluster memory, and medical device calibration data applications requiring stable component supply across long product lifecycles.

Supply support for AT27C512R-15RC 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

Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products including the AT27C512R series.

The AT27C512R product line was designed for cost-sensitive, high-reliability embedded systems requiring unalterable firmware storage with fast parallel access and JEDEC-standard packaging.

FAQ

What is the programming voltage requirement for AT27C512R-15RC?

The AT27C512R-15RC requires 13.0 V ±0.25 V applied to the OE/VPP pin during programming, with VCC raised to 6.5 V ±0.25 V. This dual-voltage scheme enables reliable oxide breakdown for OTP cell programming while maintaining compatibility with standard 5 V system rails during read operation. The AT27C512R-15RC datasheet specifies strict sequencing: VCC must be applied simultaneously with or before OE/VPP to prevent latchup.

Does AT27C512R-15RC support automatic identification in programming equipment?

Yes, the AT27C512R-15RC includes an Integrated Product Identification Code with Manufacturer ID = 0x1E and Device ID = 0x0D, accessible by holding A1–A15 low, setting A9 to 12.0 V, and toggling A0. This feature allows industry-standard programmers to auto-detect the AT27C512R-15RC and select correct algorithms and voltages without manual configuration.

Can AT27C512R-15RC operate across automotive temperature ranges?

Yes, the AT27C512R-15RC is qualified for −40°C to +125°C operation when ordered with the 'A' suffix (e.g., AT27C512R-15RA). The 'RC' suffix denotes SOIC-28 packaging and commercial temperature range (0°C to 70°C); for automotive use, the AT27C512R-15RA variant must be selected - both share identical electrical specs and pinout.

What decoupling capacitors are required for stable AT27C512R-15RC operation?

The AT27C512R-15RC requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the device as possible, plus a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays. These values are specified in the "System Considerations" section of the AT27C512R-15RC datasheet to suppress switching transients and maintain VCC stability during CE transitions.

Is AT27C512R-15RC pin-compatible with other 28-pin EPROMs like 27C512 variants?

Yes, the AT27C512R-15RC uses JEDEC-standard SOIC-28 pinout matching all 27C512-family devices (e.g., AM27C512, MX27C512), including identical A0–A15, O0–O7, CE, OE/VPP, VCC, and GND assignments. Pin compatibility is confirmed in the "Pin Configurations" section of the AT27C512R-15RC datasheet for PDIP, SOIC, PLCC, and TSOP packages.

AT27C512R-15RC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 28-SOIC (0.342", 8.69mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EPROM

Technology:: EPROM - OTP

Memory Size:: 512Kbit

Memory Organization:: 64K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: -

Access Time:: 150 ns

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SOIC

AT27C512R-15RC FAQ

1.How can I place an order for AT27C512R-15RC through Aetrix?

Please submit a Request for Quotation (RFQ) for AT27C512R-15RC 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 AT27C512R-15RC reliable?

The price and inventory of AT27C512R-15RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-15RC is usually 5 days.

3.What payment methods are accepted for AT27C512R-15RC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-15RC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT27C512R-15RC?

AT27C512R-15RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT27C512R-15RC 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 AT27C512R-15RC?

For technical support, including AT27C512R-15RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-15RC requirements.

6.How does Aetrix verify that AT27C512R-15RC is sourced from the original manufacturer or authorized distributors?

All AT27C512R-15RC 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 AT27C512R-15RC meets industry standards.

7.What is the process for return or replacement of AT27C512R-15RC?

All AT27C512R-15RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-15RC, 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 AT27C512R-15RC part is unused and in its original packaging.

Return procedure for AT27C512R-15RC:

1.Submit a request within 90 days.

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

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