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Product attributes Property Value
Manufacturer Microchip Technology
Product Series tinyAVR® 2
Packaging Tray |
Core Processor AVR
Core Size 8-Bit
Speed 20MHz
Connectivity I2C, SPI, UART/USART
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O 18
Program Memory Size 4KB (4K x 8)
Program Memory Type FLASH
EEPROM Size 128 x 8
RAM Size 512 x 8
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V
Data Converters A/D 15x12b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Grade -
Qualification AEC -
Mounting Type Surface Mount
Supplier Device Package 20-VQFN (3x3)
Package / Case 20-VFQFN Exposed Pad
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Microchip ATTINY426-MU is a high-performance 8-bit AVR microcontroller in a space-saving 20-VFQFN package. It features 4KB of flash memory and 512 bytes of SRAM, operating at up to 20MHz. With a supply range of 1.8V to 5.5V and integrated PWM, WDT, and brown-out detection, it is designed for demanding yet power-conscious embedded applications.

  • Higher throughput: 20MHz clock enables faster response in real-time control loops.
  • More memory headroom: 4KB flash and 512B RAM support more complex firmware than smaller ATtiny parts.
  • Compact QFN package: 20-pin VFQFN with exposed pad improves thermal performance and saves board area.
  • Wide voltage range: 1.8V-5.5V allows direct battery or regulated 3.3V/5V operation.

Smart Home Automation Controllers

The 20MHz speed and 4KB flash handle complex logic for lighting, thermostat, and security keypad interfaces.

Motor Control in Drones and Robotics

Multiple PWM channels and fast processing enable precise ESC (electronic speed controller) signals for small motors.

Industrial Sensor Hubs

With 512 bytes RAM and multiple I/O, it can aggregate data from temperature, pressure, and humidity sensors.

Portable Medical Devices

The 1.8V operation and small QFN package suit compact glucose meters and pulse oximeters.

Automotive Body Electronics

Its -40°C to 85°C range and robust reset features support window lift and mirror control modules.

LED Matrix Displays

The 20MHz clock allows for efficient multiplexing and PWM dimming in small LED panels.

Q: What is the maximum clock speed of the ATTINY426-MU?
A: It runs at up to 20MHz.
Q: How much program memory is available?
A: It has 4KB of flash memory (4K x 8).
Q: What package does this MCU use?
A: It is housed in a 20-pin VFQFN exposed pad package.
Q: Does it support PWM output?
A: Yes, it includes PWM channels along with WDT, POR, and brown-out detection.
Base Product Number : ATTINY426
20MHz 4KB Flash 512B RAM 8-bit MCU ATtiny AVR industrial PWM robotics smart home VFQFN-20 WDT
Q: What is the maximum clock speed of the ATTINY426-MU?
A: It runs at up to 20MHz.
Q: How much program memory is available?
A: It has 4KB of flash memory (4K x 8).
Q: What package does this MCU use?
A: It is housed in a 20-pin VFQFN exposed pad package.
Q: Does it support PWM output?
A: Yes, it includes PWM channels along with WDT, POR, and brown-out detection.