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Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-64(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATSAMD21J16B-AFT

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-64(10x10)

ATSAMD21J16B-AFT from Microchip Tech, in a TQFP-64(10x10). 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	PA00	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[0] external interrupt and the XIN32 32 kHz crystal input function when XOSC32K is used.
2	PA01	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[1] external interrupt and the XOUT32 32 kHz crystal output function when XOSC32K is used.
3	PA02	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[2], analog input AIN[0], PTC input Y[0], DAC output VOUT and TCC3/WO[0].
4	PA03	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[3], analog input AIN[1], PTC input Y[1], ADC/DAC external reference VREFA and TCC3/WO[1].
5	PB04	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[4], analog input AIN[12] and PTC input Y[10].
6	PB05	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[5], analog input AIN[13] and PTC input Y[11].
7	GNDANA	power_in	Ground for the analog power domain.
8	VDDANA	power_in	Analog supply voltage, 1.62V to 3.63V, to be decoupled with 100nF and 10µF capacitors close to the device.
9	PB06	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[6], analog input AIN[14] and PTC input Y[12].
10	PB07	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[7], analog input AIN[15] and PTC input Y[13].
11	PB08	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[8], analog input AIN[2], PTC input Y[14], SERCOM4/PAD[0], TC4/WO[0] and TCC3/WO[6].
12	PB09	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[9], analog input AIN[3], PTC input Y[15], SERCOM4/PAD[1], TC4/WO[1] and TCC3/WO[7].
13	PA04	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[4], analog inputs AIN[4] and AIN[0], ADC external reference VREFB, PTC input Y[2], SERCOM0/PAD[0] and TCC0/WO[0].
14	PA05	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[5], analog inputs AIN[5] and AIN[1], PTC input Y[3], SERCOM0/PAD[1] and TCC0/WO[1].
15	PA06	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[6], analog inputs AIN[6] and AIN[2], PTC input Y[4], SERCOM0/PAD[2] and TCC1/WO[0].
16	PA07	bidirectional	Port A general-purpose I/O on the VDDANA domain, with EXTINT[7], analog inputs AIN[7] and AIN[3], PTC input Y[5], SERCOM0/PAD[3] and TCC1/WO[1].
17	PA08	bidirectional	Port A general-purpose I/O on the VDDIO domain, with NMI, analog input AIN[16], PTC input X[0], SERCOM0/SERCOM2 PAD[0], TCC0/WO[0] and I2C-capable SERCOM pad.
18	PA09	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[9], analog input AIN[17], PTC input X[1], SERCOM0/SERCOM2 PAD[1] and TCC0/WO[1].
19	PA10	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[10], analog input AIN[18], PTC input X[2], SERCOM0/SERCOM2 PAD[2], TCC1/WO[0] and GCLK_IO[4].
20	PA11	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[11], analog input AIN[19], PTC input X[3], SERCOM0/SERCOM2 PAD[3], TCC1/WO[1] and GCLK_IO[5].
21	VDDIO	power_in	Digital supply voltage, 1.62V to 3.63V, decoupled with 100nF and 10µF capacitors close to the device.
22	GND	power_in	Digital ground reference for the device.
23	PB10	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[10], SERCOM4/PAD[2], TC5/WO[0] and TCC0/WO[4].
24	PB11	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[11], SERCOM4/PAD[3], TC5/WO[1] and TCC0/WO[5].
25	PB12	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[12], PTC input X[12], SERCOM4/PAD[0], TC4/WO[0] and TCC0/WO[6].
26	PB13	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[13], PTC input X[13], SERCOM4/PAD[1], TC4/WO[1] and TCC0/WO[7].
27	PB14	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[14], PTC input X[14], SERCOM4/PAD[2] and TC5/WO[0].
28	PB15	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[15], PTC input X[15], SERCOM4/PAD[3] and TC5/WO[1].
29	PA12	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[12], SERCOM2/SERCOM4 PAD[0], TCC2/WO[0], TCC0/WO[6] and analog comparator output AC/CMP[0].
30	PA13	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[13], SERCOM2/SERCOM4 PAD[1], TCC2/WO[1], TCC0/WO[7] and analog comparator output AC/CMP[1].
31	PA14	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[14], SERCOM2/SERCOM4 PAD[2], TC3/WO[0], TCC0/WO[4] and the XIN crystal input of the XOSC oscillator.
32	PA15	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[15], SERCOM2/SERCOM4 PAD[3], TC3/WO[1], TCC0/WO[5] and the XOUT crystal output of the XOSC oscillator.
33	GND	power_in	Digital ground reference for the device.
34	VDDIO	power_in	Digital supply voltage, 1.62V to 3.63V, decoupled with 100nF and 10µF capacitors close to the device.
35	PA16	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[0], PTC input X[4], SERCOM1/SERCOM3 PAD[0], TCC2/WO[0], TCC0/WO[6] and GCLK_IO[2].
36	PA17	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[1], PTC input X[5], SERCOM1/SERCOM3 PAD[1], TCC2/WO[1], TCC0/WO[7] and GCLK_IO[3].
37	PA18	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[2], PTC input X[6], SERCOM1/SERCOM3 PAD[2], TC3/WO[0], TCC0/WO[2] and analog comparator output AC/CMP[0].
38	PA19	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[3], PTC input X[7], SERCOM1/SERCOM3 PAD[3], TC3/WO[1], TCC0/WO[3] and analog comparator output AC/CMP[1].
39	PB16	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[0], SERCOM5/PAD[0], TC6/WO[0] and TCC0/WO[4].
40	PB17	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[1], SERCOM5/PAD[1], TC6/WO[1] and TCC0/WO[5].
41	PA20	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[4], PTC input X[8], SERCOM5/SERCOM3 PAD[2], TC7/WO[0] and TCC0/WO[6].
42	PA21	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[5], PTC input X[9], SERCOM5/SERCOM3 PAD[3], TC7/WO[1] and TCC0/WO[7].
43	PA22	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[6], PTC input X[10], SERCOM3/SERCOM5 PAD[0], TC4/WO[0], TCC0/WO[4] and I2C high-speed capable SERCOM pad.
44	PA23	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[7], PTC input X[11], SERCOM3/SERCOM5 PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz output and GCLK_IO[7].
45	PA24	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[12], SERCOM3/SERCOM5 PAD[2], TC5/WO[0], TCC1/WO[2] and USB DM; if left unconnected, a pull-up should be enabled through input GPIO mode to avoid up to 1mA extra consumption.
46	PA25	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[13], SERCOM3/SERCOM5 PAD[3], TC5/WO[1], TCC1/WO[3] and USB DP; if left unconnected, a pull-up should be enabled through input GPIO mode to avoid up to 1mA extra consumption.
47	GND	power_in	Digital ground reference for the device.
48	VDDIO	power_in	Digital supply voltage, 1.62V to 3.63V, decoupled with 100nF and 10µF capacitors close to the device.
49	PB22	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0] and GCLK_IO[0].
50	PB23	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1] and GCLK_IO[1].
51	PA27	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[15], TCC3/WO[6] and GCLK_IO[0].
52	RESET	input	External active-low reset input with an internal pull-up resistor; an external pull-up is optional.
53	PA28	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[8], TCC3/WO[7] and GCLK_IO[0].
54	GND	power_in	Digital ground reference for the device.
55	VDDCORE	power_out	Regulated core supply output of 1.6V to 1.8V from the internal regulator, requiring a 1µF decoupling capacitor close to the device.
56	VDDIN	power_in	Input supply pin for the device, which operates from a single 1.62V to 3.63V supply.
57	PA30	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0] and SWCLK debug clock pin.
58	PA31	bidirectional	Port A general-purpose I/O on the VDDIO domain, with EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5] and SWDIO, which is only activated in the presence of a debugger.
59	PB30	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[14], SERCOM5/PAD[0], TCC0/WO[0] and TCC1/WO[2].
60	PB31	bidirectional	Port B general-purpose I/O on the VDDIO domain, with EXTINT[15], SERCOM5/PAD[1], TCC0/WO[1] and TCC1/WO[3].
61	PB00	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[0], analog input AIN[8], PTC input Y[6], SERCOM5/PAD[2] and TC7/WO[0].
62	PB01	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[1], analog input AIN[9], PTC input Y[7], SERCOM5/PAD[3] and TC7/WO[1].
63	PB02	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[2], analog input AIN[10], PTC input Y[8], SERCOM5/PAD[0], TC6/WO[0] and TCC3/WO[2].
64	PB03	bidirectional	Port B general-purpose I/O on the VDDANA domain, with EXTINT[3], analog input AIN[11], PTC input Y[9], SERCOM5/PAD[1], TC6/WO[1] and TCC3/WO[3].

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	TQFP-64(10x10)
Category	Single Chip Microcomputer/Microcontroller
Pins	64

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Max	Unit	Conditions	Page
Supply voltage, VDDIO (I/O lines, OSC8M, XOSC)	VDDIO	1.62	3.63	V		36
Supply voltage, VDDIN (I/O lines and internal regulator)	VDDIN	1.62	3.63	V		36
Supply voltage, VDDANA (I/O lines, ADC, AC, DAC, PTC, oscillators)	VDDANA	1.62	3.63	V		36
Operating temperature range, package grade F (-40 - 125°C Matte Sn plating)		-40	125	°C	Ordering code grade F	17

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.	860

CAD (KiCad official)

Symbol: ATSAMD21J16B-AFT
Footprint: Package_QFP:TQFP-64_10x10mm_P0.5mm
3D model: TQFP-64(10x10) (KiCad packages3D, STEP)
3D model files: atsamd21j16b-aft-etched.step / atsamd21j16b-aft-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd21j16b-aft.step / atsamd21j16b-aft.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (1115 pp, sha256 89dcd7e783742e44, retrieved 2026-10-30, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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

# ATSAMD21J16B-AFT

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-64(10x10)

ATSAMD21J16B-AFT from Microchip Tech, in a TQFP-64(10x10). 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 | PA00 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[0] external interrupt and the XIN32 32 kHz crystal input function when XOSC32K is used. |
| 2 | PA01 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[1] external interrupt and the XOUT32 32 kHz crystal output function when XOSC32K is used. |
| 3 | PA02 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[2], analog input AIN[0], PTC input Y[0], DAC output VOUT and TCC3/WO[0]. |
| 4 | PA03 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[3], analog input AIN[1], PTC input Y[1], ADC/DAC external reference VREFA and TCC3/WO[1]. |
| 5 | PB04 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[4], analog input AIN[12] and PTC input Y[10]. |
| 6 | PB05 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[5], analog input AIN[13] and PTC input Y[11]. |
| 7 | GNDANA | power_in | Ground for the analog power domain. |
| 8 | VDDANA | power_in | Analog supply voltage, 1.62V to 3.63V, to be decoupled with 100nF and 10µF capacitors close to the device. |
| 9 | PB06 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[6], analog input AIN[14] and PTC input Y[12]. |
| 10 | PB07 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[7], analog input AIN[15] and PTC input Y[13]. |
| 11 | PB08 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[8], analog input AIN[2], PTC input Y[14], SERCOM4/PAD[0], TC4/WO[0] and TCC3/WO[6]. |
| 12 | PB09 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[9], analog input AIN[3], PTC input Y[15], SERCOM4/PAD[1], TC4/WO[1] and TCC3/WO[7]. |
| 13 | PA04 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[4], analog inputs AIN[4] and AIN[0], ADC external reference VREFB, PTC input Y[2], SERCOM0/PAD[0] and TCC0/WO[0]. |
| 14 | PA05 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[5], analog inputs AIN[5] and AIN[1], PTC input Y[3], SERCOM0/PAD[1] and TCC0/WO[1]. |
| 15 | PA06 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[6], analog inputs AIN[6] and AIN[2], PTC input Y[4], SERCOM0/PAD[2] and TCC1/WO[0]. |
| 16 | PA07 | bidirectional | Port A general-purpose I/O on the VDDANA domain, with EXTINT[7], analog inputs AIN[7] and AIN[3], PTC input Y[5], SERCOM0/PAD[3] and TCC1/WO[1]. |
| 17 | PA08 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with NMI, analog input AIN[16], PTC input X[0], SERCOM0/SERCOM2 PAD[0], TCC0/WO[0] and I2C-capable SERCOM pad. |
| 18 | PA09 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[9], analog input AIN[17], PTC input X[1], SERCOM0/SERCOM2 PAD[1] and TCC0/WO[1]. |
| 19 | PA10 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[10], analog input AIN[18], PTC input X[2], SERCOM0/SERCOM2 PAD[2], TCC1/WO[0] and GCLK_IO[4]. |
| 20 | PA11 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[11], analog input AIN[19], PTC input X[3], SERCOM0/SERCOM2 PAD[3], TCC1/WO[1] and GCLK_IO[5]. |
| 21 | VDDIO | power_in | Digital supply voltage, 1.62V to 3.63V, decoupled with 100nF and 10µF capacitors close to the device. |
| 22 | GND | power_in | Digital ground reference for the device. |
| 23 | PB10 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[10], SERCOM4/PAD[2], TC5/WO[0] and TCC0/WO[4]. |
| 24 | PB11 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[11], SERCOM4/PAD[3], TC5/WO[1] and TCC0/WO[5]. |
| 25 | PB12 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[12], PTC input X[12], SERCOM4/PAD[0], TC4/WO[0] and TCC0/WO[6]. |
| 26 | PB13 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[13], PTC input X[13], SERCOM4/PAD[1], TC4/WO[1] and TCC0/WO[7]. |
| 27 | PB14 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[14], PTC input X[14], SERCOM4/PAD[2] and TC5/WO[0]. |
| 28 | PB15 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[15], PTC input X[15], SERCOM4/PAD[3] and TC5/WO[1]. |
| 29 | PA12 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[12], SERCOM2/SERCOM4 PAD[0], TCC2/WO[0], TCC0/WO[6] and analog comparator output AC/CMP[0]. |
| 30 | PA13 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[13], SERCOM2/SERCOM4 PAD[1], TCC2/WO[1], TCC0/WO[7] and analog comparator output AC/CMP[1]. |
| 31 | PA14 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[14], SERCOM2/SERCOM4 PAD[2], TC3/WO[0], TCC0/WO[4] and the XIN crystal input of the XOSC oscillator. |
| 32 | PA15 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[15], SERCOM2/SERCOM4 PAD[3], TC3/WO[1], TCC0/WO[5] and the XOUT crystal output of the XOSC oscillator. |
| 33 | GND | power_in | Digital ground reference for the device. |
| 34 | VDDIO | power_in | Digital supply voltage, 1.62V to 3.63V, decoupled with 100nF and 10µF capacitors close to the device. |
| 35 | PA16 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[0], PTC input X[4], SERCOM1/SERCOM3 PAD[0], TCC2/WO[0], TCC0/WO[6] and GCLK_IO[2]. |
| 36 | PA17 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[1], PTC input X[5], SERCOM1/SERCOM3 PAD[1], TCC2/WO[1], TCC0/WO[7] and GCLK_IO[3]. |
| 37 | PA18 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[2], PTC input X[6], SERCOM1/SERCOM3 PAD[2], TC3/WO[0], TCC0/WO[2] and analog comparator output AC/CMP[0]. |
| 38 | PA19 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[3], PTC input X[7], SERCOM1/SERCOM3 PAD[3], TC3/WO[1], TCC0/WO[3] and analog comparator output AC/CMP[1]. |
| 39 | PB16 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[0], SERCOM5/PAD[0], TC6/WO[0] and TCC0/WO[4]. |
| 40 | PB17 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[1], SERCOM5/PAD[1], TC6/WO[1] and TCC0/WO[5]. |
| 41 | PA20 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[4], PTC input X[8], SERCOM5/SERCOM3 PAD[2], TC7/WO[0] and TCC0/WO[6]. |
| 42 | PA21 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[5], PTC input X[9], SERCOM5/SERCOM3 PAD[3], TC7/WO[1] and TCC0/WO[7]. |
| 43 | PA22 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[6], PTC input X[10], SERCOM3/SERCOM5 PAD[0], TC4/WO[0], TCC0/WO[4] and I2C high-speed capable SERCOM pad. |
| 44 | PA23 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[7], PTC input X[11], SERCOM3/SERCOM5 PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz output and GCLK_IO[7]. |
| 45 | PA24 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[12], SERCOM3/SERCOM5 PAD[2], TC5/WO[0], TCC1/WO[2] and USB DM; if left unconnected, a pull-up should be enabled through input GPIO mode to avoid up to 1mA extra consumption. |
| 46 | PA25 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[13], SERCOM3/SERCOM5 PAD[3], TC5/WO[1], TCC1/WO[3] and USB DP; if left unconnected, a pull-up should be enabled through input GPIO mode to avoid up to 1mA extra consumption. |
| 47 | GND | power_in | Digital ground reference for the device. |
| 48 | VDDIO | power_in | Digital supply voltage, 1.62V to 3.63V, decoupled with 100nF and 10µF capacitors close to the device. |
| 49 | PB22 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0] and GCLK_IO[0]. |
| 50 | PB23 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1] and GCLK_IO[1]. |
| 51 | PA27 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[15], TCC3/WO[6] and GCLK_IO[0]. |
| 52 | RESET | input | External active-low reset input with an internal pull-up resistor; an external pull-up is optional. |
| 53 | PA28 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[8], TCC3/WO[7] and GCLK_IO[0]. |
| 54 | GND | power_in | Digital ground reference for the device. |
| 55 | VDDCORE | power_out | Regulated core supply output of 1.6V to 1.8V from the internal regulator, requiring a 1µF decoupling capacitor close to the device. |
| 56 | VDDIN | power_in | Input supply pin for the device, which operates from a single 1.62V to 3.63V supply. |
| 57 | PA30 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0] and SWCLK debug clock pin. |
| 58 | PA31 | bidirectional | Port A general-purpose I/O on the VDDIO domain, with EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5] and SWDIO, which is only activated in the presence of a debugger. |
| 59 | PB30 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[14], SERCOM5/PAD[0], TCC0/WO[0] and TCC1/WO[2]. |
| 60 | PB31 | bidirectional | Port B general-purpose I/O on the VDDIO domain, with EXTINT[15], SERCOM5/PAD[1], TCC0/WO[1] and TCC1/WO[3]. |
| 61 | PB00 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[0], analog input AIN[8], PTC input Y[6], SERCOM5/PAD[2] and TC7/WO[0]. |
| 62 | PB01 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[1], analog input AIN[9], PTC input Y[7], SERCOM5/PAD[3] and TC7/WO[1]. |
| 63 | PB02 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[2], analog input AIN[10], PTC input Y[8], SERCOM5/PAD[0], TC6/WO[0] and TCC3/WO[2]. |
| 64 | PB03 | bidirectional | Port B general-purpose I/O on the VDDANA domain, with EXTINT[3], analog input AIN[11], PTC input Y[9], SERCOM5/PAD[1], TC6/WO[1] and TCC3/WO[3]. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TQFP-64(10x10) |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 64 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage, VDDIO (I/O lines, OSC8M, XOSC) | VDDIO | 1.62 |  | 3.63 | V |  | 36 |
| Supply voltage, VDDIN (I/O lines and internal regulator) | VDDIN | 1.62 |  | 3.63 | V |  | 36 |
| Supply voltage, VDDANA (I/O lines, ADC, AC, DAC, PTC, oscillators) | VDDANA | 1.62 |  | 3.63 | V |  | 36 |
| Operating temperature range, package grade F (-40 - 125°C Matte Sn plating) |  | -40 |  | 125 | °C | Ordering code grade F | 17 |

## 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. | 860 |

## CAD (KiCad official)

- Symbol: `ATSAMD21J16B-AFT`
- Footprint: `Package_QFP:TQFP-64_10x10mm_P0.5mm`
- 3D model: TQFP-64(10x10) (KiCad packages3D, STEP)
- 3D model files: `atsamd21j16b-aft-etched.step` / `atsamd21j16b-aft-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atsamd21j16b-aft.step` / `atsamd21j16b-aft.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/atsamd21j16b-aft-datasheet.pdf) (1115 pp, sha256 `89dcd7e783742e44`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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](docs/atsamd21j16b-aft-datasheet.pdf)

ATSAMD21J16B-AFT

Verified ATSAMD21J16B-AFT

Verification log 1 record

ATSAMD21J16B-AFT

Pinout

Key specifications

Electrical characteristics

Materials and finish

CAD (KiCad official)

Provenance