XL9555 from XINLUDA, in a TSSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	INT	output	Active-LOW open-drain interrupt output. Asserted when any input state differs from the corresponding Input Port register value. Requires an external pull-up resistor to VCC.
2	A1	input	Hardware I2C address bit 1. Tie directly to VCC or GND to set the device slave address; must not float and must not change while powered.
3	A2	input	Hardware I2C address bit 2. Tie directly to VCC or GND to set the device slave address; must not float and must not change while powered.
4	P00	bidirectional	Port 0 bit 0 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
5	P01	bidirectional	Port 0 bit 1 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
6	P02	bidirectional	Port 0 bit 2 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
7	P03	bidirectional	Port 0 bit 3 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
8	P04	bidirectional	Port 0 bit 4 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
9	P05	bidirectional	Port 0 bit 5 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
10	P06	bidirectional	Port 0 bit 6 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
11	P07	bidirectional	Port 0 bit 7 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
12	GND	power_in	Supply ground reference (0 V).
13	P10	bidirectional	Port 1 bit 0 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
14	P11	bidirectional	Port 1 bit 1 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
15	P12	bidirectional	Port 1 bit 2 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
16	P13	bidirectional	Port 1 bit 3 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
17	P14	bidirectional	Port 1 bit 4 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
18	P15	bidirectional	Port 1 bit 5 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
19	P16	bidirectional	Port 1 bit 6 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
20	P17	bidirectional	Port 1 bit 7 general-purpose I/O. Push-pull output; input at power-on reset. XL9555 has an internal ~100 kohm pull-up to VCC on this pin.
21	A0	input	Hardware I2C address bit 0. Tie directly to VCC or GND to set the device slave address; must not float and must not change while powered.
22	SCL	input	I2C-bus / SMBus serial clock input. Requires an external pull-up resistor to VCC. Standard-mode (100 kHz) and Fast-mode (400 kHz) capable.
23	SDA	bidirectional	I2C-bus / SMBus serial data line (open-drain). Requires an external pull-up resistor to VCC.
24	VCC	power_in	Positive supply voltage, 2.3 V to 5.5 V (absolute max 6 V). Bypass locally with a ceramic decoupling capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	XINLUDA
Package	TSSOP-24
Category	Interface
Pins	24

Ordering variants

Same part, different packaging or reel option.

XL9555
XL9555D
XL9555SS
XL9555QF24

CAD (KiCad official)

Symbol: XL9555
Footprint: Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm
3D model: TSSOP-24 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`xl9555.step`	315 KB	You want the bare part, or you mark your own boards.
`xl9555-etched.step`	2.3 MB	You want the part with `XL9555` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 576 faces against 387 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: XINLUDA datasheet (25 pp, sha256 80ea36f92c4bf704, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF