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Product attributes Property Value
Manufacturer Microchip Technology
Product Series tinyAVR® 2
Packaging Cut Tape (CT) | Tape & Reel (TR)
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 22
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 ~ 125°C (TA)
Grade -
Qualification AEC -
Mounting Type Surface Mount
Supplier Device Package 24-VQFN (4x4)
Package / Case 24-VFQFN Exposed Pad
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Microchip ATTINY427-MFR is an 8-bit AVR microcontroller with 4KB Flash and 512B SRAM. It operates at 20MHz from 1.8V to 5.5V in a 24-VFQFN package. With PWM, brown-out reset, POR, and WDT, it is designed for reliable control in extreme temperatures.

  • Extended temperature range for industrial/automotive
  • 20MHz speed with low 1.8V operation
  • Compact 24-VFQFN package
  • Integrated safety features (BOD, POR, WDT)

Automotive Sensor Interface

125°C rating and 20MHz speed allow real-time processing of temperature or pressure sensors in engine bays.

Industrial Actuator

4KB Flash is sufficient for PID control loops; WDT ensures fail-safe operation.

Smart Lighting

PWM output with 1.8V-5.5V range drives LED drivers in architectural lighting.

Portable Instrument

Low power consumption and small VFQFN package fit handheld multimeters.

Safety Switch

Brown-out reset and POR guarantee correct power-up sequencing in emergency stop systems.

HVAC Zone Controller

Extended temperature range supports rooftop or attic installations.

Q: What is the voltage range?
A: 1.8V to 5.5V.
Q: What is the clock speed?
A: 20MHz.
Q: How much Flash memory?
A: 4KB Flash.
Q: What is the RAM size?
A: 512 bytes SRAM.
Q: What temperature range?
A: -40°C to 125°C.
Base Product Number : ATTINY427
20MHz 4KB Flash 512B SRAM 8-bit MCU automotive AVR high temperature industrial PWM VFQFN-24
Q: What is the voltage range?
A: 1.8V to 5.5V.
Q: What is the clock speed?
A: 20MHz.
Q: How much Flash memory?
A: 4KB Flash.
Q: What is the RAM size?
A: 512 bytes SRAM.
Q: What temperature range?
A: -40°C to 125°C.