AT90USB162-16MU from Microchip Tech, in a QFN-32-EP(5x5). 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	XTAL1	input	Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
2	XTAL2/PC0	bidirectional	Output from the inverting oscillator amplifier if enabled by fuse, also serves as generic I/O PC0.
3	GND	power_in	Ground.
4	VCC	power_in	Digital supply voltage (2.7 - 5.5V).
5	PC2/PCINT11	bidirectional	Port C bit 2, bi-directional I/O with internal pull-up and pin change interrupt PCINT11.
6	PD0/OC.0B/INT0	bidirectional	Port D bit 0, bi-directional I/O with internal pull-up, with Timer0 output compare OC.0B and external interrupt INT0.
7	PD1/AIN0/INT1	bidirectional	Port D bit 1, bi-directional I/O with internal pull-up, also analog comparator input AIN0 and external interrupt INT1.
8	PD2/RXD1/AIN1/INT2	bidirectional	Port D bit 2, bi-directional I/O with internal pull-up, also USART1 RXD1, analog comparator input AIN1 and interrupt INT2.
9	PD3/TXD1/INT3	bidirectional	Port D bit 3, bi-directional I/O with internal pull-up, also USART1 TXD1 and external interrupt INT3.
10	PD4/INT5	bidirectional	Port D bit 4, bi-directional I/O with internal pull-up, also external interrupt INT5.
11	PD5/XCK/PCINT12	bidirectional	Port D bit 5, bi-directional I/O with internal pull-up, also USART1 XCK and pin change interrupt PCINT12.
12	PD6/RTS/INT6	bidirectional	Port D bit 6, bi-directional I/O with internal pull-up, also USART1 hardware flow control RTS and external interrupt INT6.
13	PD7/CTS/HWB/T0/INT7	bidirectional	Port D bit 7, bi-directional I/O with internal pull-up, also USART1 CTS, HWB, Timer0 clock input T0 and external interrupt INT7.
14	PB0/SS/PCINT0	bidirectional	Port B bit 0, bi-directional I/O with internal pull-up, also SPI slave select SS and pin change interrupt PCINT0.
15	PB1/SCLK/PCINT1	bidirectional	Port B bit 1, bi-directional I/O with internal pull-up, also SPI clock SCLK and pin change interrupt PCINT1.
16	PB2/PDI/MOSI/PCINT2	bidirectional	Port B bit 2, bi-directional I/O with internal pull-up, also SPI MOSI/programming data input PDI and pin change interrupt PCINT2.
17	PB3/PDO/MISO/PCINT3	bidirectional	Port B bit 3, bi-directional I/O with internal pull-up, also SPI MISO/programming data output PDO and pin change interrupt PCINT3.
18	PB4/T1/PCINT4	bidirectional	Port B bit 4, bi-directional I/O with internal pull-up, also Timer1 clock input T1 and pin change interrupt PCINT4.
19	PB5/PCINT5	bidirectional	Port B bit 5, bi-directional I/O with internal pull-up and pin change interrupt PCINT5.
20	PB6/PCINT6	bidirectional	Port B bit 6, bi-directional I/O with internal pull-up and pin change interrupt PCINT6.
21	PB7/PCINT7/OC.0A/OC.1C	bidirectional	Port B bit 7, bi-directional I/O with internal pull-up, also pin change interrupt PCINT7 and output compares OC.0A/OC.1C.
22	PC7/INT4/ICP1/CLKO	bidirectional	Port C bit 7, bi-directional I/O with internal pull-up, also external interrupt INT4, Timer1 input capture ICP1 and clock output CLKO.
23	PC6/OC.1A/PCINT8	bidirectional	Port C bit 6, bi-directional I/O with internal pull-up, also Timer1 output compare OC.1A and pin change interrupt PCINT8.
24	RESET/PC1/dW	input	Reset input, a low level longer than the minimum pulse length generates a reset even if the clock is not running; alternatively serves as debugWire channel or generic I/O depending on fuses RSTDISBL and DWEN.
25	PC5/PCINT9/OC.1B	bidirectional	Port C bit 5, bi-directional I/O with internal pull-up, also pin change interrupt PCINT9 and Timer1 output compare OC.1B.
26	PC4/PCINT10	bidirectional	Port C bit 4, bi-directional I/O with internal pull-up and pin change interrupt PCINT10.
27	UCAP	power_out	USB pads internal regulator output supply voltage, to be connected to an external 1µF capacitor.
28	UGND	power_in	USB ground.
29	D+/SCK	bidirectional	USB full speed positive data upstream port / clock port for PS/2.
30	D-/SDATA	bidirectional	USB full speed negative data upstream port / data port for PS/2.
31	UVCC	power_in	USB pads internal regulator input supply voltage.
32	AVCC	power_in	AVCC supply pin shown in the pinout; the datasheet text gives no further description.
33	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	QFN-32-EP(5x5)
Category	Embedded Processors & Controllers
Pins	33

Electrical characteristics

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

Parameter	Min	Max	Unit	Conditions	Page
Maximum frequency		8	MHz	At 2.7 V, industrial range	2
Maximum frequency		16	MHz	At 4.5 V, industrial range	2
Operating voltage	2.7	5.5	V		2
Operating temperature (industrial)	-40	85	°C	Industrial range	2

CAD (KiCad official)

Symbol: AT90USB162-16MU
Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
3D model files: at90usb162-16mu-etched.step / at90usb162-16mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at90usb162-16mu.step / at90usb162-16mu.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (21 pp, sha256 75b1cd268b82d2e8, retrieved 2026-10-30, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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

AT90USB162-16MU

Changed since verified AT90USB162-16MU

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README