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ATTINY3216-SNR

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Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATTINY3216-SNR

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-20-300mil

ATTINY3216-SNR from Microchip Tech, in a SOIC-20-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VDD power_in Positive supply input for the device, operating range 2.7V to 5.5V.
2 PA4 bidirectional General-purpose I/O PA4 with ADC0 AIN4, ADC1 AIN0, PTC X0/Y0, TCA0 WO4, TCD0 WOA, SPI0 SS, USART0 XDIR (alternate) and CCL LUT0-OUT functions.
3 PA5 bidirectional General-purpose I/O PA5 with external reference input VREFA, ADC0 AIN5, ADC1 AIN1, PTC X1/Y1, TCA0 WO5, TCB0 WO and TCD0 WOB functions.
4 PA6 bidirectional General-purpose I/O PA6 with ADC0 AIN6, ADC1 AIN2, PTC X2/Y2, analog comparator inputs and the DAC0 analog output.
5 PA7 bidirectional General-purpose I/O PA7 with ADC0 AIN7, ADC1 AIN3, PTC X3/Y3, analog comparator inputs and CCL LUT1-OUT functions.
6 PB5 bidirectional General-purpose I/O PB5 with CLKOUT, ADC0 AIN8, PTC X12/Y12, analog comparator input and TCA0 WO2 (alternate) functions.
7 PB4 bidirectional General-purpose I/O PB4 with ADC0 AIN9, PTC X13/Y13, analog comparator inputs, TCA0 WO1 (alternate) and LUT0-OUT (alternate) functions.
8 PB3 bidirectional General-purpose I/O PB3 that also serves as the TOSC1 32.768 kHz crystal oscillator pin, with USART0 RxD and TCA0 WO0 (alternate) functions.
9 PB2/TOSC2 bidirectional General-purpose I/O PB2 that also serves as the TOSC2 32.768 kHz crystal oscillator pin, with EVOUT1, USART0 TxD and TCA0 WO2 functions.
10 PB1 bidirectional General-purpose I/O PB1 with ADC AIN10, PTC X4/Y4, analog comparator input, USART0 XCK, TWI0 SDA and TCA0 WO1 functions.
11 PB0 bidirectional General-purpose I/O PB0 with ADC AIN11, PTC X5/Y5, analog comparator inputs, USART0 XDIR, TWI0 SCL and TCA0 WO0 functions.
12 PC0 bidirectional General-purpose I/O PC0 with ADC AIN6, PTC X6/Y6, SPI0 SCK (alternate), TCB0 WO (alternate) and TCD0 WOC functions.
13 PC1 bidirectional General-purpose I/O PC1 with ADC AIN7, PTC X7/Y7, SPI0 MISO (alternate), TCD0 WOD and LUT1-OUT (alternate) functions.
14 PC2 bidirectional General-purpose I/O PC2 with EVOUT2, ADC AIN8, PTC X8/Y8 and SPI0 MOSI (alternate) functions.
15 PC3 bidirectional General-purpose I/O PC3 with ADC AIN9, PTC X9/Y9, SPI0 SS (alternate), TCA0 WO3 (alternate) and CCL LUT1-IN0 functions.
16 PA0/RESET/UPDI bidirectional General-purpose I/O PA0 that is configurable by fuse as the RESET input or the single-pin UPDI program/debug interface, with ADC0 AIN0 and CCL LUT0-IN0 functions.
17 PA1 bidirectional General-purpose I/O PA1 with ADC0 AIN1, SPI0 MOSI, USART0 TxD and TWI0 SDA (alternate positions) and CCL LUT0-IN1 functions.
18 PA2 bidirectional General-purpose I/O PA2 with EVOUT0, ADC0 AIN2, SPI0 MISO, USART0 RxD and TWI0 SCL (alternate positions) and CCL LUT0-IN2 functions.
19 PA3/EXTCLK bidirectional General-purpose I/O PA3 that also serves as the external clock input EXTCLK, with ADC0 AIN3, SPI0 SCK, TCA0 WO3 and TCB1 WO functions.
20 GND power_in Ground reference for the device.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package SOIC-20-300mil
Category Embedded Processors & Controllers
Pins 20

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In the Self Capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor. 458

CAD (KiCad official)

  • Symbol: ATTINY3216-SNR
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
  • 3D model files: attiny3216-snr-etched.step / attiny3216-snr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); attiny3216-snr.step / attiny3216-snr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip Tech datasheet (572 pp, sha256 97cb689010a2d3b4, retrieved 2026-10-27, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF