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Product attributes Property Value
Manufacturer Microchip Technology
Product Series AVR® ATtiny
Packaging Cut Tape (CT) | Tape & Reel (TR)
Core Processor AVR
Core Size 8-Bit
Speed 12MHz
Connectivity I2C, SPI
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O 18
Program Memory Size 4KB (2K x 16)
Program Memory Type FLASH
EEPROM Size -
RAM Size 256 x 8
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V
Data Converters A/D 12x10b
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 ATTINY40-MMHR is an 8-bit AVR MCU in a 20-VFQFN package, running at 12MHz. It offers 4KB flash and 256B SRAM, with a wide 1.8V-5.5V supply range. Integrated brown-out detection, POR, PWM, and WDT provide robust operation for compact embedded designs.

  • Ultra-small 20-VFQFN package: Saves board space in miniaturized products.
  • 1.8V-5.5V operation: Supports single-cell battery or regulated 5V supplies.
  • Integrated brown-out detection: Prevents erratic behavior during voltage dips.
  • 12MHz AVR core: Balanced performance for real-time control tasks.

Compact IoT Sensor Endpoints

Small QFN package and low pin count make it ideal for space-constrained wireless sensor nodes.

Battery Management in Wearables

1.8V operation extends battery life in fitness trackers and smart watches.

Motor Control for Drones

PWM outputs at 12MHz provide precise ESC signals for small brushless motors.

LED Lighting Effects

4KB flash stores multiple animation patterns; PWM drives RGB LEDs directly.

Security Keypads

Brown-out detection ensures reliable key scanning in access control panels.

Analog Sensor Conditioning

Internal POR and WDT maintain stable operation in noisy industrial environments.

Q: What is the maximum clock speed of ATTINY40-MMHR?
A: It runs at 12MHz with a 1.8V-5.5V supply.
Q: How much program memory does it have?
A: It has 4KB flash (2K x 16) and 256 bytes of SRAM.
Q: What package is available?
A: It comes in a 20-pad VFQFN package with exposed pad for thermal relief.
Q: Does it include brown-out detection?
A: Yes, it has Brown-out Detect/Reset, POR, PWM, and WDT.
Q: What is the temperature range?
A: It operates from -40°C to +85°C.
Base Product Number : ATTINY40
12MHz 256B RAM 4KB flash 8-bit MCU AVR BOD IoT Microchip motor control PWM VFQFN-20 WDT wearable
Q: What is the maximum clock speed of ATTINY40-MMHR?
A: It runs at 12MHz with a 1.8V-5.5V supply.
Q: How much program memory does it have?
A: It has 4KB flash (2K x 16) and 256 bytes of SRAM.
Q: What package is available?
A: It comes in a 20-pad VFQFN package with exposed pad for thermal relief.
Q: Does it include brown-out detection?
A: Yes, it has Brown-out Detect/Reset, POR, PWM, and WDT.
Q: What is the temperature range?
A: It operates from -40°C to +85°C.