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PCA9539DB

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Texas Instruments I/O Expanders, SSOP-24-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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PCA9539DB

Texas Instruments · I/O Expanders · SSOP-24-208mil

PCA9539DB from Texas Instruments, in a SSOP-24-208mil. 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 INT output Open-drain interrupt output, active low, which must be connected to VCC through a pullup resistor.
2 A1 input Address input that must be connected directly to VCC or ground.
3 RESET input Active-low reset input that must be connected to VCC through a pullup resistor if no active connection is used.
4 P00 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
5 P01 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
6 P02 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
7 P03 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
8 P04 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
9 P05 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
10 P06 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
11 P07 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
12 GND power_in Ground.
13 P10 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
14 P11 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
15 P12 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
16 P13 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
17 P14 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
18 P15 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
19 P16 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
20 P17 bidirectional P-port input/output with push-pull design structure; inputs may be raised to 5.5 V and outputs are rated for IOL of 25 mA maximum and IOH of -10 mA.
21 A0 input Address input that must be connected directly to VCC or ground.
22 SCL input Serial clock bus that must be connected to VCC through a pullup resistor.
23 SDA bidirectional Serial data bus that must be connected to VCC through a pullup resistor.
24 VCC power_in Supply voltage; the device operates from 2.3 V to 5.5 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SSOP-24-208mil
Category Interface
Pins 24

CAD (KiCad official)

  • Symbol: PCA9539DB
  • Footprint: Package_SO:SSOP-24_5.3x8.2mm_P0.65mm
  • 3D model: SSOP-24-208mil (KiCad packages3D, STEP)
  • 3D model files: pca9539db-etched.step / pca9539db-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); pca9539db.step / pca9539db.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (48 pp, sha256 efe5c16c360b8432, retrieved 2026-10-10, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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