AT42QT1481-AUR from Microchip Tech, in a TQFP-44(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	MOSI	input	SPI data input; leave open if unused.
2	MISO	output	SPI data output; leave open if unused.
3	SCK	input	SPI clock input; tie to Vdd if unused.
4	RST	input	Reset, active low, with internal 30 k - 60 k pull-up resistor; should be controlled by the host; tie to Vdd if unused.
5	VDD	power_in	Power supply pin.
6	VSS	power_in	Ground pin.
7	XT2	output	Connection for ceramic resonator or crystal, 16 MHz.
8	XT1	input	Connection for ceramic resonator or crystal, 16 MHz.
9	RX	input	UART receive data input; tie to Vdd if unused.
10	TX	output	UART transmit data output with internal 20 k - 50 k pull-up resistor; leave open if unused.
11	WS	input	Wake-up from sleep input and/or sync input; tie to Vdd if unused.
12	SMP	bidirectional	Sample output pin.
13	Y3A	bidirectional	Y line connection; leave open if unused.
14	Y2A	bidirectional	Y line connection; leave open if unused.
15	Y1A	bidirectional	Y line connection; leave open if unused.
16	Y0A	bidirectional	Y line connection; leave open if unused.
17	VDD	power_in	Power supply pin.
18	VSS	power_in	Ground pin.
19	X0	output	X matrix drive line; leave open if unused.
20	X1	output	X matrix drive line; leave open if unused.
21	X2	output	X matrix drive line; leave open if unused.
22	X3	output	X matrix drive line; leave open if unused.
23	X4	output	X matrix drive line; leave open if unused.
24	X5	output	X matrix drive line; leave open if unused.
25	X6	output	X matrix drive line; leave open if unused.
26	X7	output	X matrix drive line; leave open if unused.
27	VDD	power_in	Power supply pin.
28	VSS	power_in	Ground pin.
29	VDD	power_in	Power supply pin.
30	Y0B	bidirectional	Y line connection; leave open if unused.
31	Y1B	bidirectional	Y line connection; leave open if unused.
32	Y2B	bidirectional	Y line connection; leave open if unused.
33	Y3B	bidirectional	Y line connection; leave open if unused.
34	Y4A	bidirectional	Y line connection; leave open if unused.
35	Y4B	bidirectional	Y line connection; leave open if unused.
36	Y5A	bidirectional	Y line connection; leave open if unused.
37	Y5B	bidirectional	Y line connection; leave open if unused.
38	VDD	power_in	Power supply pin.
39	VSS	power_in	Ground pin.
40	STATUS / DBG_DATA	output	Status output (active low) or Debug Data, with internal 20 k - 50 k pull-up resistor; leave open if unused.
41	DRDY	bidirectional	Open-drain comms-ready I/O with internal 20 k - 50 k pull-up; 1 = comms ready after a 100 µs grace period; this pin MUST be used.
42	VREF	power_in	Connect to Vss.
43	S_SYNC / DBG_CLK	output	Scope synchronization output or Debug Clock; leave open if unused.
44	SS	input	SPI slave select with internal 20 k - 50 k pull-up resistor; leave open if unused.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	TQFP-44(10x10)
Category	Sensors
Pins	44

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Vdd supply voltage (recommended operating range)	Vdd	4.75		5.25	V		58
Operating temperature		-40		105	°C		58
Storage temperature		-55		125	°C		58
Supply ripple + noise				20	mV p-p		58
Cx transverse load capacitance per key	Cx	0		20	pF		58
Oscillator frequency tolerance (Fosc nominal 16 MHz)	Fosc	-2		2	%		58
Vdd absolute maximum supply voltage	Vdd			6	V		58
Max continuous pin current, any control or drive pin		-10		10	mA		58
Frequency of operation				17	MHz		58
EEPROM setups maximum writes				100000	write cycles		58
Low output voltage	Vol			0.6	V	4mA sink	59
High output voltage	Voh	4.2			V	1 mA source	59
Input leakage current	Iil	-1		1	µA		59
Acquisition resolution	Ar		9	11	bits		59
Internal pull-up resistors (DRDY, SS, TX, STATUS pins)	Rp	20		50	k	DRDY, SS, TX, STATUS pins	59
Internal RST pull-up resistor	Rrst	30		60	k		59
SS to first CLK edge	S1	125			ns	SPI parameter controlled by host	59
CLK to valid MISO	S2			20	ns	SPI parameter controlled by QT1481	59
Last CLK to SS	S3	25			ns	SPI parameter controlled by host	59
SS to 3-state MISO	S4			20	ns	SPI parameter controlled by QT1481	59
SS to falling DRDY	S5			20	µs	SPI parameter controlled by QT1481	59
DRDY low pulse width	S6	1			µs	SPI parameter controlled by QT1481	59
CLK low pulse width	S7	125			ns	SPI parameter controlled by host	59
CLK high pulse width	S8	125			ns	SPI parameter controlled by host	59
CLK period	S9	250			ns	SPI parameter controlled by host	59
SPI clock rate	Fck			4	MHz	SPI parameter controlled by host	59
Supply current, running	Iddr		13		mA		59
Supply current, sleeping	Idds		15		µA		59
Vdd internal reset voltage	Vr		4		V		59

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
housing	abs		When a finger is sensed, the signal falls since the human body acts to absorb charge from the cross-coupling	40
contacts		gold	AT42QT1481-AU QS738 44-pin 10 × 10 mm TQFP RoHS compliant IC AT42QT1481-AUR QS738 44-pin 10 × 10 mm TQFP RoHS compliant IC - Tape and reel	62

CAD (KiCad official)

Symbol: AT42QT1481-AUR
Footprint: Package_QFP:TQFP-44_10x10mm_P0.8mm
3D model: TQFP-44(10x10) (KiCad packages3D, STEP)
3D model files: at42qt1481-aur-etched.step / at42qt1481-aur-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at42qt1481-aur.step / at42qt1481-aur.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (73 pp, sha256 c079e60007fe4fb7, 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

AT42QT1481-AUR

Verified AT42QT1481-AUR

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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