USB2244I-AEZG-06-TR from Microchip Tech, in a QFN-36(6x6). 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	LED	bidirectional	Media activity LED output (I/O12 buffer, 12 mA sink and source).
2	USB+	bidirectional	USB bus data plus signal, analog I/O as defined in the USB 2.0 Specification.
3	USB-	bidirectional	USB bus data minus signal, analog I/O as defined in the USB 2.0 Specification.
4	SD_D1	bidirectional	SD/MMC bi-directional data bit 1 with weak internal pull-up, 12 mA sink and source.
5	SD_D0	bidirectional	SD/MMC bi-directional data bit 0 with weak internal pull-up, 12 mA sink and source.
6	VDD33	power_in	3.3 V power and regulator input.
7	SD_D7	bidirectional	SD/MMC bi-directional data bit 7 with weak internal pull-up, 12 mA sink and source.
8	SD_D6	bidirectional	SD/MMC bi-directional data bit 6 with weak internal pull-up, 12 mA sink and source.
9	SD_CLK	output	Output clock to the SD/MMC device with software-configurable frequency, 12 mA source.
10	SD_D5	bidirectional	SD/MMC bi-directional data bit 5 with weak internal pull-up, 12 mA sink and source.
11	SD_CMD	bidirectional	Bi-directional command signal to the CMD pin of the SD/MMC device with weak internal pull-up, 12 mA sink and source.
12	NC	unconnected	No connect; no trace or signal should be routed or attached to this pin.
13	VDD18	power_in	+1.8 V core power; must have a 1.0 µF ± 20% (ESR < 0.1 Ω) capacitor to VSS.
14	VDD33	power_in	3.3 V power and regulator input.
15	NC	unconnected	No connect; no trace or signal should be routed or attached to this pin.
16	NC	unconnected	No connect; no trace or signal should be routed or attached to this pin.
17	NC	unconnected	No connect; no trace or signal should be routed or attached to this pin.
18	RESET_N	input	Active-low Schmitt-trigger chip reset input; the low pulse should be at least 1 µs wide.
19	NC	unconnected	Not connected on USB2244/44I (listed without a signal name in the reset-state table).
20	SD_D4	bidirectional	SD/MMC bi-directional data bit 4 with weak internal pull-up, 12 mA sink and source.
21	CRD_PWR	bidirectional	Card power drive of 3.3 V at either 100 mA or 200 mA from the internal FET (I/O200 buffer).
22	VDD33	power_in	3.3 V power and regulator input.
23	SD_D3	bidirectional	SD/MMC bi-directional data bit 3 with weak internal pull-up, 12 mA sink and source.
24	NC	unconnected	Not connected on USB2244/44I (listed without a signal name in the reset-state table).
25	SD_D2	bidirectional	SD/MMC bi-directional data bit 2 with weak internal pull-up, 12 mA sink and source.
26	SD_nCD	input	SD card detect input, enabled as an input with pull-up after reset.
27	RXD / SDA	bidirectional	UART RXD input (custom firmware required) or SDA data pin to an external serial EEPROM (I/O12).
28	TEST	input	Test input; tie to ground for normal operation.
29	NC	unconnected	Not connected on USB2244/44I (listed without a signal name in the reset-state table).
30	SD_WP	input	SD write protect detection signal.
31	TXD / SCK	output	UART TXD output (custom firmware required) or clock output to an external EEPROM (O12).
32	XTAL2	output	24 MHz crystal output terminal, left open when an external clock drives XTAL1 (CLKIN).
33	XTAL1 (CLKIN)	input	24 MHz crystal terminal or external 24 MHz clock input when a crystal is not used.
34	VDD18PLL	power_in	+1.8 V filtered analog power for the internal PLL; must have a 1.0 µF ± 20% (ESR < 0.1 Ω) capacitor to VSS.
35	RBIAS	passive	USB transceiver bias pin; a 12.0 kΩ ± 1.0% resistor is connected from VSS to this pin.
36	VDDA33	power_in	3.3 V analog power.
37	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	QFN-36(6x6)
Category	Interface ICs
Pins	37

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 Temperature	TA	-40		85	°C	Industrial Part; ambient temperature in still air	32
3.3 V supply voltage	VDD33	3		3.6	V	Note 9-3	32
3.3 V supply rise time	tRT	0		400	μs		32
Voltage on USB+ and USB- pins		-0.3		5.5	V		32
Storage Temperature	TA	-55		150	°C		31
3.3 V supply voltage	VDD33	-0.5		4	V		31
Voltage on USB+ and USB- pins		-0.5		6	V	Printed as (3.3 V supply voltage + 2) ≤ 6V	31
Voltage on XTAL1		-0.5		3.6	V		31
Low Input Level, I and IPU/IPD buffers	VILI			0.8	V	TTL Levels	32
High Input Level, I and IPU/IPD buffers	VIHI	2			V	TTL Levels	32
Low Input Level, IS buffer	VILI			0.8	V	TTL Levels	32
High Input Level, IS buffer	VIHI	2			V	TTL Levels	32
Low Input Level, ICLK buffer	VILCK			0.5	V		32
High Input Level, ICLK buffer	VIHCK	1.4			V		32
Input Leakage, ICLK buffer	IIL	-10		10	μA	VIN = 0 to VDD33	32
Input Leakage, all I and IS buffers, low	IIL	-10		10	μA	VIN = 0	32
Input Leakage, all I and IS buffers, high	IIH	-10		10	μA	VIN = VDD33	32
Low Output Level, O12 buffer	VOL			0.4	V	IOL = 12 mA @ VDD33= 3.3 V	33
Output Leakage, O12 buffer	IOL	-10		10	μA	VIN = 0 to VDD33 (Note 9-4)	33
Low Output Level, I/O12 buffers	VOL			0.4	V	IOL = 12 mA @ VDD33= 3.3 V	33
Output Leakage, I/O12 buffers	IOL	-10		10	μA	VIN = 0 to VDD33 (Note 9-4)	33
Integrated Power FET for CRD_PWR, High Output Current Mode	IOUT	200			mA	VdropFET = 0.46 V	33
Integrated Power FET for CRD_PWR, Low Output Current Mode	IOUT	100			mA	VdropFET = 0.23 V	33
On Resistance, integrated power FET	RDSON			2.1	Ω	IFET = 70 mA	33
Output Voltage Rise Time, integrated power FET	tDSON			800	μs	CLOAD = 10 μF	33
Supply Current Unconfigured	ICCINIT		80	90	mA		33
Supply Current Active, Full Speed	ICC		110	135	mA	Full Speed	33
Supply Current Active, High Speed	ICC		140	165	mA	High Speed	33
Supply Current Suspend	ICSBY		350	700	µA		33
Industrial Temperature Suspend	ICSBYI		350	900	µA		33
Thermal Resistance, junction-to-ambient, 0 m/s	ΘJA		33.2		°C/W	Velocity 0 m/s	34
Thermal Resistance, junction-to-ambient, 1 m/s	ΘJA		29		°C/W	Velocity 1 m/s	34
Thermal Resistance, junction-to-ambient, 2 m/s	ΘJA		26		°C/W	Velocity 2 m/s	34
Junction-to-Top-of-Package, 0 m/s	ΨJT		2.6		°C/W	Velocity 0 m/s	34
Junction-to-Top-of-Package, 1 m/s	ΨJT		2.6		°C/W	Velocity 1 m/s	34
Junction-to-Top-of-Package, 2 m/s	ΨJT		2.6		°C/W	Velocity 2 m/s	34
RESET_N asserted	t1	1			μsec		27
Device recovery/stabilization	t2		500		μsec		27
8051 programs device configuration	t3		20	50	msec		27
USB attach	t4		100		msec		27
Host acknowledges attach and signals USB reset	t5		100		msec		27
Ready to handle requests	t7		5		msec		27
Clock Input Capacitance	CXTAL		2		pF	All pins (except USB pins and pins under test) are tied to AC ground	34
Input Capacitance	CIN		10		pF		34
Output Capacitance	COUT		20		pF		34

CAD (KiCad official)

Symbol: USB2244I-AEZG-06-TR
Footprint: Package_DFN_QFN:QFN-36-1EP_6x6mm_P0.5mm_EP3.7x3.7mm
3D model: QFN-36(6x6) (KiCad packages3D, STEP)
3D model files: usb2244i-aezg-06-tr-etched.step / usb2244i-aezg-06-tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); usb2244i-aezg-06-tr.step / usb2244i-aezg-06-tr.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (43 pp, sha256 3e98a6a324cc56bd, retrieved 2026-11-09, 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

USB2244I-AEZG-06-TR

Verified USB2244I-AEZG-06-TR

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README