ATTINY45-20MU

Overview

The Atmel ATTINY45-20MU is an 8-bit AVR microcontroller featuring a 20-pin MLF surface-mount package. It integrates 4 KB of in-system programmable Flash, 512 bytes of SRAM, and 512 bytes of EEPROM. The device operates on a single-supply voltage ranging from 2.7 V to 5.5 V with a maximum clock frequency of 20 MHz. Key peripherals include one 8-bit timer/counter, one 10-bit ADC with four channels, an analog comparator, and a Universal Serial Interface (USI).

Feature Summary

• Compact 8-bit RISC architecture optimized for low-power embedded applications.
• Integrated non-volatile memory supporting in-system programming and high endurance cycles.
• On-chip analog comparator and multi-channel ADC for signal processing tasks.
• Universal Serial Interface (USI) enabling flexible communication protocols.

Applications

• Battery-powered sensor nodes requiring minimal power consumption.
• Simple logic control units in consumer electronics.
• LED lighting management systems.
• Basic data acquisition interfaces.

Procurement Notes

Verify the specific suffix 'MU' confirms the MLF package type and industrial temperature range during sourcing. Ensure compatibility with existing PCB footprints for the 20-lead Micro Lead Frame configuration. Confirm that the supply chain source provides genuine Microchip or Atmel products to avoid counterfeit components affecting long-term reliability.

Selection Notes

Select this component when project constraints demand a balance between code capacity and physical footprint. The 4 KB Flash size accommodates moderate firmware complexity without excessive cost. Consider the 20-pin MLF package for automated surface-mount assembly processes where space efficiency is critical compared to through-hole alternatives.

Part Context

This part belongs to the ATtiny series within the broader AVR microcontroller family. The series is characterized by its focus on cost-effective, low-pin-count solutions for simple control tasks. As an evolution of earlier 8-bit designs, it maintains backward compatibility with standard development tools while offering improved power efficiency and integrated peripheral sets suitable for standalone operation.

Replacement Considerations

Cross-reference with ATTINY25-20MU or ATTINY85-20MU based on required program memory size. Verify pinout compatibility as these variants share the same package but differ in internal storage capacities. Ensure software migration accounts for any differences in available I/O lines or peripheral configurations.