ATTINY461A-MU 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	NC	unconnected	No connect.
2	PB3	bidirectional	Port B bit 3 with internal pull-up; alternate functions OC1B (Timer/Counter1 Compare Match B output) and PCINT11.
3	NC	unconnected	No connect.
4	VCC	power_in	Supply voltage (1.8 - 5.5V operating range).
5	GND	power_in	Ground.
6	NC	unconnected	No connect.
7	PB4	bidirectional	Port B bit 4 with internal pull-up; alternate functions ADC7, OC1D (inverted), CLKI/XTAL1 (clock or crystal oscillator input) and PCINT12.
8	PB5	bidirectional	Port B bit 5 with internal pull-up; alternate functions ADC8, OC1D, CLKO/XTAL2 (crystal oscillator output, divided system clock output) and PCINT13.
9	NC	unconnected	No connect.
10	PB6	bidirectional	Port B bit 6 with internal pull-up; alternate functions ADC9, INT0 external interrupt, T0 Timer/Counter0 clock source and PCINT14.
11	PB7	bidirectional	Port B bit 7; RESET input (low level longer than minimum pulse length generates a reset) or weak I/O if reset disabled, also debugWIRE I/O, ADC10 and PCINT15.
12	NC	unconnected	No connect.
13	PA7	bidirectional	Port A bit 7 with internal pull-up; alternate functions ADC6, AIN1 and PCINT7.
14	PA6	bidirectional	Port A bit 6 with internal pull-up; alternate functions ADC5, AIN0 and PCINT6.
15	PA5	bidirectional	Port A bit 5 with internal pull-up; alternate functions ADC4, AIN2 and PCINT5.
16	NC	unconnected	No connect.
17	PA4	bidirectional	Port A bit 4 with internal pull-up; alternate functions ADC3, ICP0 and PCINT4.
18	AVCC	power_in	Analog supply for the ADC, analog comparator, BOD, internal voltage reference and Port A; must be connected to VCC (through a low-pass filter if the ADC is used).
19	NC	unconnected	No connect.
20	NC	unconnected	No connect.
21	AGND	power_in	Analog ground.
22	PA3	bidirectional	Port A bit 3 with internal pull-up; alternate functions AREF (ADC reference) and PCINT3.
23	PA2	bidirectional	Port A bit 2 with internal pull-up; alternate functions ADC2, INT1, USCK/SCL (USI clock, with USIPOS set) and PCINT2.
24	NC	unconnected	No connect.
25	PA1	bidirectional	Port A bit 1 with internal pull-up; alternate functions ADC1, DO (USI data output, with USIPOS set) and PCINT1.
26	PA0	bidirectional	Port A bit 0 with internal pull-up; alternate functions ADC0, DI/SDA (USI data, with USIPOS set) and PCINT0.
27	NC	unconnected	No connect.
28	NC	unconnected	No connect.
29	NC	unconnected	No connect.
30	PB0	bidirectional	Port B bit 0 with internal pull-up; alternate functions MOSI/DI/SDA (USI data input), OC1A and PCINT8.
31	PB1	bidirectional	Port B bit 1 with internal pull-up; alternate functions MISO/DO (USI data output), OC1A and PCINT9.
32	PB2	bidirectional	Port B bit 2 with internal pull-up; alternate functions SCK/USCK/SCL (USI clock), OC1B (inverted) and PCINT10.
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	Symbol	Min	Typ	Max	Unit	Conditions	Page
Operating Voltage	VCC	1.8		5.5	V		1
Operating Temperature (DC characteristics)	TA	-40		85	°C	Industrial range	185
Clock Frequency 1.8-5.5V	1/tCLCL	0		4	MHz	VCC = 1.8 - 5.5V	188
Clock Frequency 2.7-5.5V	1/tCLCL	0		10	MHz	VCC = 2.7 - 5.5V	188
Clock Frequency 4.5-5.5V	1/tCLCL	0		20	MHz	VCC = 4.5 - 5.5V	188
Operating Temperature (absolute max)		-55		125	°C		185
Storage Temperature		-65		150	°C		185
Voltage on any Pin except RESET		-0.5			V	with respect to Ground; max VCC +0.5V	185
Voltage on RESET		-0.5		13	V	with respect to Ground	185
Maximum Operating Voltage				6	V		185
DC Current per I/O Pin				40	mA		185
DC Current VCC and GND Pins				200	mA		185
Input Low-voltage, except XTAL1 and RESET	VIL	-0.5			V	Except XTAL1 and RESET pins; max 0.2VCC	185
Input Low-voltage, XTAL1	VIL	-0.5			V	XTAL1 pin, External Clock Selected; max 0.1VCC	185
Input Low-voltage, RESET	VIL	-0.5			V	RESET pin; max 0.2VCC	185
Output Low Voltage 5V	VOL			0.6	V	IOL = 10 mA, VCC = 5V	185
Output Low Voltage 3V	VOL			0.5	V	IOL = 5 mA, VCC = 3V	185
Output Low Voltage 1.8V	VOL			0.4	V	IOL = 2 mA, VCC = 1.8V	185
Output Low Voltage RESET as I/O 5V	VOL			0.6	V	RESET pin as I/O, IOL = 2 mA, VCC = 5V	185
Output Low Voltage RESET as I/O 3V	VOL			0.5	V	RESET pin as I/O, IOL = 1 mA, VCC = 3V	185
Output Low Voltage RESET as I/O 1.8V	VOL			0.4	V	RESET pin as I/O, IOL = 0.4 mA, VCC = 1.8V	185
Output High Voltage 5V	VOH	4.3			V	IOH = -10 mA, VCC = 5V	185
Output High Voltage 3V	VOH	2.5			V	IOH = -5 mA, VCC = 3V	185
Output High Voltage 1.8V	VOH	1.4			V	IOH = -2 mA, VCC = 1.8V	185
Input Leakage Current, pin low	IIL		0.05	1	µA	VCC = 5.5V, pin low (absolute value); typ printed as <0.05	185
Input Leakage Current, pin high	IIH		0.05	1	µA	VCC = 5.5V, pin high (absolute value); typ printed as <0.05	186
Reset Pull-up Resistor	RRST	30		60	kΩ		186
I/O Pin Pull-up Resistor	RPU	20		50	kΩ		186
Supply Current Active 1MHz	ICC		0.2	0.5	mA	Active 1MHz, VCC = 2V	186
Supply Current Active 4MHz	ICC		1.2	2	mA	Active 4MHz, VCC = 3V	186
Supply Current Active 8MHz	ICC		3.6	7	mA	Active 8MHz, VCC = 5V	186
Supply Current Idle 1MHz	ICC		0.04	0.15	mA	Idle 1MHz, VCC = 2V	186
Supply Current Idle 4MHz	ICC		0.25	0.4	mA	Idle 4MHz, VCC = 3V	186
Supply Current Idle 8MHz	ICC		0.9	1.5	mA	Idle 8MHz, VCC = 5V	186
Power-down Current WDT enabled	ICC		4	10	µA	WDT enabled, VCC = 3V	186
Power-down Current WDT disabled	ICC		0.15	2	µA	WDT disabled, VCC = 3V	186
Internal Oscillator Factory Calibration Accuracy		-10	8	10	%	8.0 MHz, 3V, 25°C (typ is MHz target)	187
Internal Bandgap Voltage	VBG	1	1.1	1.2	V	VCC = 2.7V, TA = 25°C	188
Power-on Reset Release Threshold	VPOR	1.1	1.4	1.6	V	TA = -40 to +85°C	189
Power-on Reset Activation Threshold	VPOA	0.6	1.3	1.6	V	TA = -40 to +85°C	189
Brown-out Threshold BODLEVEL 110	VBOT	1.7	1.8	2	V	BODLEVEL[2:0] = 110	189
Brown-out Threshold BODLEVEL 101	VBOT	2.5	2.7	2.9	V	BODLEVEL[2:0] = 101	189
Brown-out Threshold BODLEVEL 100	VBOT	4.1	4.3	4.5	V	BODLEVEL[2:0] = 100	189
ADC Internal 1.1V Reference	VINT	1	1.1	1.2	V		190
ADC Internal 2.56V Reference	VINT	2.3	2.56	2.8	V	VCC > 3.0V	190
ADC External Reference Voltage	AREF	2			V	Single ended; max AVCC	190
ADC Clock Frequency, single ended		50		1000	kHz		190
ADC Absolute Accuracy, single ended				2	LSB	VREF = 4V, VCC = 4V, ADC clock = 200 kHz	190
Analog Comparator Input Offset Voltage	VAIO		10	40	mV	VCC = 5V, VIN = VCC / 2	193
Analog Comparator Input Leakage Current	ILAC	-50		50	nA	VCC = 5V, VIN = VCC / 2	193

CAD (KiCad official)

Symbol: ATTINY461A-MU
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: attiny461a-mu-etched.step / attiny461a-mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); attiny461a-mu.step / attiny461a-mu.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (296 pp, sha256 b805ae111d6b33c0, retrieved 2026-10-30, tier: lcsc)
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

ATTINY461A-MU

Verified ATTINY461A-MU

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README