Microchip Technology AT27C512R-45JI

Mfr. Part

AT27C512R-45JI

Manufacturer

Micrel / Microchip Technology

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Detailed Description

512Kbit OTP EPROM, 8-bit parallel interface, 64K x 8 organization, 45 ns access time, industrial temperature grade. Surface-mount 32-PLCC (J-lead), size 13.97 x 11.43 mm. Operates from 4.5 V to 5.5 V. RoHS non-compliant (leaded). Ideal for fixed firmware storage in legacy and industrial systems. In stock quantity reference: 1481 units available (subject to change).

Key Features

512Kbit capacity (64K x 8)

EPROM OTP technology (one-time programmable)

Fast read access time: 45 ns

Parallel 8-bit data bus, standard pinout

Wide supply range: 4.5 V to 5.5 V

Industrial temperature range: -40°C to +85°C

Surface-mount PLCC-32, J-lead

Base product number family: AT27C512

TTL/CMOS compatible I/O (see datasheet for exact levels)

Low standby power (typical values in datasheet)

Key Advantages

Simple, robust non-volatile storage without complex controllers

Fast read timing for performance-critical legacy designs

OTP construction improves security and tamper resistance (no erase window)

Broad compatibility with standard EPROM programmers and sockets

Stable data retention over long life in industrial environments

Mature, proven technology for maintenance and repair of existing equipment

Packaging

Type: PLCC-32, J-lead, surface mount

Material: Molded plastic package (no quartz window; OTP)

Size: 13.97 mm x 11.43 mm body (supplier device package)

Pin configuration: 32 pins, JEDEC-standard EPROM pinout for 64K x 8 devices

Mounting: J-lead for SMT; compatible with reflow profiles per JEDEC for PLCC

Thermal characteristics: Designed for -40°C to +85°C operation; use standard PLCC thermal guidelines, ensure adequate PCB copper for heat spreading; reference datasheet for θJA/θJC if needed

Electrical properties: VCC 4.5 V to 5.5 V, 45 ns read access, TTL/CMOS-level inputs/outputs; programming requires EPROM programmer with VPP around 12–13 V (exact conditions in datasheet)

Shipping form: Tube

RoHS: Non-compliant (contains lead in leads/plating)

Lifecycle

Status: Mature legacy product class. Many EPROM/OTP parts are NRND or approaching end-of-life in some packages. Availability varies by region and date.

Same-family alternatives (package/speed/temp variations; check fit and timing):

- AT27C512R-45PU (DIP-28, 45 ns, typically industrial/commercial options)

- AT27C512R-70PU (DIP-28, 70 ns)

- AT27C512R-55JI (PLCC-32, 55 ns)

- AT27C512-45JI (non-R variant; verify power/timing differences)

- AT27C512R-45JC (PLCC-32, commercial temp)

Cross-vendor legacy EPROM options (verify pinout, timing, programming voltages):

- STMicroelectronics M27C512 series (various speeds and packages)

- Winbond W27C512 (note: often EEPROM/OTP variants; verify technology)

- AMD/Spansion AM27C512 (legacy, many builds discontinued)

If you need exact drop-in replacements or current production status, please contact our sales team via the Y-IC website for the latest guidance and vetted cross-references.

Key Application Areas

Fixed firmware storage for industrial controllers and PLCs

Legacy embedded systems requiring 8-bit parallel EPROM

Telecom infrastructure and networking cards maintenance

Automotive service tools and legacy ECUs (pre-flash architectures)

Test equipment, instrumentation, and measurement gear

Consumer electronics repair and retro computing

Secure, single-program load for production devices

Datasheet

Y-IC provides the most authoritative datasheet for AT27C512R-45JI on our product page. We recommend you download the datasheet now to confirm pinout, programming conditions, timing, and electrical limits.

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