Specification	AT89C4051-12SU

Connectivity	UART/USART
Core Processor	8051
Core Size	8-Bit
Mounting Type	Surface Mount
Number of I/O	15
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Oscillator Type	Internal
Package / Case	20-SOIC
Package / Case [y]	0.295 in
Package / Case [y]	7.5 mm
Peripherals	LED, Brown-out Detect/Reset, POR
Program Memory Size	4 KB
Program Memory Type	FLASH
RAM Size	128 x 8
Speed	12 MHz
Supplier Device Package	20-SOIC
Voltage - Supply (Vcc/Vdd) [Max]	6 V
Voltage - Supply (Vcc/Vdd) [Min]	2.7 V

AT89C4051 Series

Part	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Package / Case	Package / Case	Core Size	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Supplier Device Package	Program Memory Type	Number of I/O	Speed	Mounting Type	Connectivity	Peripherals	Oscillator Type	Program Memory Size	Core Processor	RAM Size	Package / Case [y]	Package / Case [y]
Microchip Technology AT89C4051-12PU	85 °C	-40 °C	20-DIP	7.62 mm	0.3 in	8-Bit	6 V	2.7 V	20-PDIP	FLASH	15	12 MHz	Through Hole	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8
Microchip Technology AT89C4051-12SI	85 °C	-40 °C	20-SOIC			8-Bit	6 V	4 V	20-SOIC	FLASH	15	12 MHz	Surface Mount	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8	0.295 in	7.5 mm
Microchip Technology AT89C4051-24SC	70 °C	0 °C	20-SOIC			8-Bit	6 V	4 V	20-SOIC	FLASH	15	24 MHz	Surface Mount	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8	0.295 in	7.5 mm
Microchip Technology AT89C4051-24PC	70 °C	0 °C	20-DIP	7.62 mm	0.3 in	8-Bit	6 V	4 V	20-PDIP	FLASH	15	24 MHz	Through Hole	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8
Microchip Technology AT89C4051-12SU	85 °C	-40 °C	20-SOIC			8-Bit	6 V	2.7 V	20-SOIC	FLASH	15	12 MHz	Surface Mount	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8	0.295 in	7.5 mm
Microchip Technology AT89C4051-24SI	85 °C	-40 °C	20-SOIC			8-Bit	6 V	4 V	20-SOIC	FLASH	15	24 MHz	Surface Mount	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8	0.295 in	7.5 mm
Microchip Technology AT89C4051-24PI	85 °C	-40 °C	20-DIP	7.62 mm	0.3 in	8-Bit	6 V	4 V	20-PDIP	FLASH	15	24 MHz	Through Hole	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8
Microchip Technology AT89C4051-24SU	85 °C	-40 °C	20-SOIC			8-Bit	6 V	4 V	20-SOIC	FLASH	15	24 MHz	Surface Mount	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8	0.295 in	7.5 mm
Microchip Technology AT89C4051-12PC	70 °C	0 °C	20-DIP	7.62 mm	0.3 in	8-Bit	6 V	4 V	20-PDIP	FLASH	15	12 MHz	Through Hole	UART/USART	Brown-out Detect/Reset LED POR	Internal	4 KB	8051	128 x 8

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 1.50
		25	$ 1.38
		100	$ 1.24
Microchip Direct	TUBE	1	$ 1.50
		25	$ 1.38
		100	$ 1.24
		1000	$ 1.14
		5000	$ 1.09
Newark	Each	100	$ 1.28

Description

General part information

AT89C4051 Series

A low-voltage, high-performance CMOS 8-bit microcontroller with 4KB of flash programmable and erasable read-only memory (PEROM). The device uses Microchip's s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. This versatile 8-bit CPU with flash provides a highly-flexible and cost-effective solution for many embedded control applications.

Documents

Technical documentation and resources

AT89C4051-12SU

Deep-Dive with AI

AT89C4051-12SU

Deep-Dive with AI

Technical Specifications

AT89C4051 Series

Pricing

Description

AT89C4051 Series

Documents

Analyzing the Behavior of an Oscillator and Ensuring Good Start-up

AT89C4051 - Complete Datasheet

Program Examples for 8051 UART

Design Guide for 8051 Standard Devices

Migrating from AT89C51/C52 to AT89S51/S52

Program Examples for 8051 Timers

AT89C4051 Series