Microchip Technology AT27C512R-12JI

Mfr. Part

AT27C512R-12JI

Manufacturer

Micrel / Microchip Technology. Y-IC is a quality distributor of this brand and we will provide you with the best products and services.

Detailed Description

512 Kbit (64K x 8) one-time programmable EPROM for 5 V systems. 120 ns read access, parallel interface, industrial temperature grade. Packaged in a 32‑PLCC J‑lead surface-mount housing. Single 5 V read operation, non-volatile data storage. Ideal for legacy firmware storage and code memory where OTP EPROM is acceptable.

Key Features

Memory density 512 Kbit, organized as 64K x 8

Technology EPROM OTP (one-time programmable)

Access time 120 ns for fast reads

Supply voltage 4.5 V to 5.5 V (single 5 V read)

Interface parallel, 8-bit data bus

Package 32‑PLCC (13.97 x 11.43 mm), J‑lead LCC, surface mount

Operating temperature -40°C to +85°C (industrial)

RoHS status non-compliant (leaded), important for compliance-controlled projects

Base family AT27C512 for footprint and functional compatibility across options

Package shipment type Tube

Key Advantages

Simple, direct parallel interface for easy use with 8-bit and 16-bit MCUs, FPGAs, and legacy buses

Stable, non-volatile storage with long data retention typical of EPROM technology

Industrial temperature range supports harsh environments

Mature, proven technology for long-lived and legacy designs

PLCC J‑lead package saves board space versus DIP while staying socket-friendly

Packaging

Type component package 32‑PLCC, J‑lead LCC

External size approximately 13.97 mm x 11.43 mm body outline (standard PLCC-32)

Material molded plastic body with metal leadframe (plastic-leaded chip carrier)

Pin configuration 32 pins total

- Address lines A0–A15 (16 lines)

- Data lines D0–D7 (8 lines)

- Control signals CE#, OE#

- Programming pin PGM/VPP (for initial programming)

- Power pins VCC, VSS

- Refer to datasheet for exact pin numbers and PLCC pinout

Mounting surface mount, J‑lead gull-wing style for PLCC sockets or soldering

Thermal characteristics industrial temperature range -40°C to +85°C (board-level cooling, no heatsink normally required). For thermal resistance and power dissipation limits, see datasheet.

Electrical properties read supply 4.5 V to 5.5 V, access time 120 ns, non-volatile EPROM OTP. Input/outputs designed for standard 5 V logic levels. For current consumption and timing details, see datasheet.

Shipping packaging Tube

Lifecycle

Status EPROM OTP devices are mature products. Availability can vary by speed grade and package. Some variants may be on long-term support or NRND. Please verify the latest status on our website or contact Y-IC sales for up-to-date supply information.

Equivalent or alternative models (verify pinout, programming algorithm, timings, voltage, temperature grade, and RoHS before use)

- Microchip/Atmel family

- AT27C512R-12JU 32‑PLCC, 120 ns, commercial/industrial variant

- AT27C512R-15JI 32‑PLCC, 150 ns, industrial

- AT27C512R-12PU 28‑DIP, 120 ns, through-hole

- AT27C512-12JI non‑R variant, 32‑PLCC, similar function

- STMicroelectronics

- M27C512-12F1 32‑PLCC, 120 ns (check F/RoHS suffix and temp range)

- M27C512-90B6 series options in PLCC/DIP (timings vary)

- AMD/Alliance/ESMT legacy

- AM27C512‑120JI 32‑PLCC, 120 ns (legacy, check availability)

- MX27C512 variants (Macronix), 32‑PLCC or DIP

- SST/Microchip flash‑based drop‑in style

- SST27SF512‑70‑3C‑PHE 512 Kbit, 5 V flash (electrically erasable, different programming, verify compatibility)

If you need a fully compatible substitute or current lifecycle confirmation, please contact our sales team via the Y-IC website for detailed guidance.

Key Application Areas

Boot and firmware storage for embedded systems

Legacy industrial controllers, PLC expansion, and HMI panels

Telecom and networking cards requiring 5 V code memory

Test equipment, medical, and instrumentation with long field lifetimes

Automotive service tools and industrial vehicles (within -40°C to +85°C)

FPGA configuration ROM for older platforms using parallel PROMs

Secure OTP code distribution where field erasure is not desired

Datasheet

Y-IC hosts the most authoritative datasheet for this product model on our website. We recommend you download it directly from this page to get full electrical specs, pinouts, programming conditions, and timing diagrams.

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