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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

PCA9539PWR

Texas Instruments · I/O Expanders · TSSOP-24

PCA9539PWR from Texas Instruments, 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	tri_state	Interrupt output (open-drain, active low); 3 mA maximum sink current at VOL = 0.4 V.
2	A1	input	Address input (MSB of programmable address bits); connect to VCC or GND.
3	RESET	input	Active-low reset input; minimum pulse width tW = 6 ns; 5-V tolerant.
4	P00	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
5	P01	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
6	P02	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
7	P03	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
8	P04	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
9	P05	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
10	P06	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
11	P07	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
12	GND	power_in	Ground; 0 V reference.
13	P10	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
14	P11	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
15	P12	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
16	P13	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
17	P14	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
18	P15	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
19	P16	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
20	P17	bidirectional	I/O port; configurable as input or output; 5-V tolerant; maximum 25 mA.
21	A0	input	Address input (LSB of programmable address bits); connect to VCC or GND.
22	SCL	bidirectional	I2C serial clock; maximum frequency 400 kHz; open-drain compatible.
23	SDA	bidirectional	I2C serial data; maximum frequency 400 kHz; open-drain compatible.
24	VCC	power_in	Supply voltage; operating range 2.3 V to 5.5 V; maximum 1 μA standby current.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-24
Category	Interface
Pins	24

CAD (KiCad official)

Symbol: PCA9539PWR
Footprint: Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm
3D model: TSSOP-24 (KiCad packages3D, STEP)
3D model files: pca9539pwr-etched.step / pca9539pwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); pca9539pwr.step / pca9539pwr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (48 pp, sha256 866d4b57152bbc82, retrieved 2026-09-22, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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