ATTINY43U-SU

Overview

The ATTINY43U-SU is an 8-bit AVR RISC microcontroller from the ATtiny family, manufactured by Microchip Technology (formerly Atmel). It features 4KB of In-System Programmable Flash memory, 256 bytes of SRAM, and 64 bytes of EEPROM. The device operates on a single supply voltage ranging from 1.8V to 5.5V and supports a maximum CPU frequency of 8 MHz. It is housed in a 20-pin SOIC W package and includes 16 programmable I/O lines. Key peripherals include two timers, two PWM channels, and a Universal Serial Interface (USI) for SPI or I2C communication.

Feature Summary

• Advanced RISC architecture with 120 powerful instructions, most executing in a single clock cycle.
• Integrated non-volatile memory including self-programmable Flash, EEPROM, and internal SRAM.
• Supports low-power operation with multiple sleep modes to minimize energy consumption.
• Includes debugWIRE on-chip debugging capability for development and testing.

Applications

• Battery-powered embedded systems requiring low power consumption
• Industrial control applications using USI-based serial communication
• Simple motor control circuits utilizing PWM outputs
• General-purpose digital logic replacement in compact designs

Procurement Notes

Verify the specific suffix 'SU' corresponds to the 20-pin SOIC Wide package when sourcing. Confirm the operating temperature range matches industrial requirements if applicable. Ensure the source document explicitly lists the part as active status. Cross-reference the manufacturer's latest datasheet for any pinout or electrical characteristic updates prior to final procurement decisions.

Selection Notes

Select this component for applications needing moderate code storage with minimal peripheral complexity. It is suitable where cost-sensitive 8-bit processing is required without ADC capabilities. Consider the 8 MHz speed limit for timing-critical tasks. Evaluate power consumption specs against battery life requirements given the available sleep modes.

Part Context

This part belongs to the ATtiny series of 8-bit microcontrollers designed for small-scale embedded applications. It shares architectural similarities with other ATtiny devices but offers specific memory configurations. The 'U' suffix typically denotes the ultra-low voltage variant within the family, while 'SU' indicates the surface-mount package type.

Replacement Considerations

Check Microchip's official obsolescence notices for direct replacements. Similar ATtiny models with different memory sizes may serve as functional substitutes if pin compatibility is maintained. Verify that alternative parts support the same USI interface configuration.