Atmel AT89C2051-24P

Mfr. Part

AT89C2051-24P

Manufacturer

Atmel (Microchip Technology). Y-IC is a quality distributor of Atmel/Microchip products, and we are committed to giving you the best products and the best service.

Detailed Description

Compact 8-bit 8051‑compatible microcontroller with 2 KB Flash and 128 B RAM in a 20-pin PDIP package. Max speed grade 24 MHz. Provides 15 programmable I/O lines, two 16‑bit timers/counters, full‑duplex UART, on‑chip analog comparator, and standard 8051 interrupt structure with power‑saving modes. Ideal for simple control, legacy replacements, and through‑hole designs. Main Category: Integrated Circuits (ICs). Small Classification: Specialized ICs.

Key Features

8‑bit 8051 core, up to 24 MHz

2 KB in‑system reprogrammable Flash (byte/sector erase; external programmer required for C‑variants)

128 bytes internal RAM

15 GPIO pins (P1.0–P1.7, P3.0–P3.5) plus RST, XTAL1, XTAL2, VCC, GND

Two 16‑bit timer/counters, full‑duplex serial port (UART)

On‑chip analog comparator

Idle and Power‑down low‑power modes

On‑chip oscillator (use with crystal/resonator or external clock)

Standard 8051 interrupt sources and priority

PDIP 20‑pin through‑hole package for easy prototyping and repair

Key Advantages

Simple, proven 8051 architecture with huge ecosystem and tool support

Small 20‑pin footprint fits tight, cost‑sensitive designs

Through‑hole PDIP is easy to hand‑solder and service in the field

Low power modes extend battery life

Drop‑in friendly for many legacy AT89C2051/8051 designs

Stable long‑life platform for maintenance of existing equipment

Packaging

Package type: 20‑pin PDIP (commonly PDIP‑20, 0.300 in/7.62 mm width). Mfr case code often mapped from 1057

Body material: epoxy molding compound with copper leadframe (RoHS status depends on full suffix; see part marking)

Mounting: through‑hole

Standard supply format: tubes (PDIP). Tape and reel not typical for PDIP

Pin configuration: 20 pins total; 15 I/O, VCC, GND, RST, XTAL1, XTAL2

Mechanical size: approx. 24–26 mm body length, 6–7 mm body height, 7.62 mm row spacing

Thermal: PDIP packages have good thermal margin for low‑power MCUs; follow datasheet thermal limits and derating

Electrical highlights: 5 V family part, 24 MHz speed grade; TTL/CMOS‑compatible I/O; exact VCC and I/O thresholds per datasheet and suffix

Lifecycle

Status: Legacy 8051 family device. Many channels list AT89C2051 as Not Recommended for New Designs or Obsolete. Availability can vary by package and suffix. Y‑IC can still source inventory for maintenance and long‑life programs

In‑stock quantity reference: 2100 units (subject to change)

Recommended equivalents or alternatives (verify pinout, voltage, and firmware compatibility before use):

- AT89C2051‑24PU or AT89C2051‑24PI (same family, PDIP variants with specific lead finish/temperature grades)

- AT89C2051‑24SU (SOIC‑20 version; surface‑mount alternative)

- AT89C2051‑12P (lower speed grade; check performance needs)

- AT89S2051 (SPI in‑system programmable variant; similar resources)

- AT89C4051 (4 KB Flash, same 20‑pin family with more code space)

- AT89LP2052 (low‑power/high‑speed 2 KB 8051‑compatible upgrade)

If you do not see a perfect equivalent, contact our sales team via the Y‑IC website for vetted cross‑references and last‑time buy options.

Key Application Areas

Industrial control panels and small automation nodes

Legacy equipment service and drop‑in replacements

Simple human‑machine interfaces and keypad/LED control

Serial (UART) peripheral controllers and RS‑232 adapters

Educational projects and 8051 training kits

Sensor interfacing, small instrumentation, and timing/measurement tasks

Consumer appliance control and small motor/relay drive logic

Datasheet

Y‑IC hosts the most authoritative datasheet for this exact model on our product page. We strongly recommend downloading it from this page to get pinouts, electrical limits, timing, and programming details.

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