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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 10
Program Memory Size 2KB (1K x 16)
Program Memory Type FLASH
EEPROM Size -
RAM Size 128 x 8
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V
Data Converters A/D 8x10b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Grade -
Qualification AEC -
Mounting Type Surface Mount
Supplier Device Package 12-WLCSP (1.56x1.4)
Package / Case 12-UFBGA, WLCSP
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Microchip ATTINY20-UUR is an ultra-compact 8-bit AVR microcontroller in a 12-ball WLCSP package. It operates from 1.8V to 5.5V at up to 12MHz, with 2KB Flash and 128 bytes SRAM. Integrated features include brown-out detection, POR, PWM, and WDT. Its tiny footprint and low voltage make it perfect for wearables, medical disposables, and miniaturized IoT devices.

  • Ultra-small WLCSP package: Enables miniaturized product designs where PCB area is extremely limited.
  • 1.8V operation: Directly powered by a single alkaline or lithium coin cell without boost converter.
  • 2KB Flash: Sufficient for small control routines and data storage in disposable devices.
  • Integrated POR and BOD: Ensures clean startup and shutdown in battery-powered applications.

Wearable Fitness Trackers

The 12-UFBGA package is only 1.5mm x 2mm, fitting into smart rings or patches. 1.8V operation works with coin cells.

Disposable Medical Sensors

Low cost and tiny size enable single-use diagnostic strips. The 2KB Flash stores calibration data.

Smart Packaging Labels

Ultra-thin WLCSP integrates into paper labels. 12MHz speed handles simple data logging for cold-chain monitoring.

Hearing Aid Electronics

1.8V supply matches zinc-air batteries. The small footprint fits behind-the-ear devices.

Miniature IoT Nodes

For space-constrained wireless sensors, the WLCSP saves board space. PWM outputs drive LEDs or buzzers.

E-Textiles

The tiny package can be embedded in fabric. Low power consumption extends battery life in smart clothing.

Q: What is the operating voltage?
A: 1.8V to 5.5V, ideal for single-cell battery devices.
Q: What is the maximum speed?
A: 12MHz at 5V.
Q: How much Flash and RAM?
A: 2KB Flash and 128 bytes SRAM.
Q: What package is this?
A: 12-UFBGA (WLCSP) – wafer-level chip scale package.
Q: Is it suitable for wearables?
A: Yes, the ultra-small package and low voltage are perfect for compact wearables.
Base Product Number : ATTINY20
128B RAM 12MHz 2KB Flash 8-bit MCU AVR low voltage medical ultra-small wearable WLCSP
Q: What is the operating voltage?
A: 1.8V to 5.5V, ideal for single-cell battery devices.
Q: What is the maximum speed?
A: 12MHz at 5V.
Q: How much Flash and RAM?
A: 2KB Flash and 128 bytes SRAM.
Q: What package is this?
A: 12-UFBGA (WLCSP) – wafer-level chip scale package.
Q: Is it suitable for wearables?
A: Yes, the ultra-small package and low voltage are perfect for compact wearables.