component

PCA9536

Public Made by Adom

by adom

TI 4-bit I2C/SMBus I/O expander, SOIC-8. Four configurable I/O pins on a fixed I2C address, 2.3-5.5 V. Datasheet-verified.

componentinterfaceio-expandergpio-expanderi2csoic-8texas-instruments
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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
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docs pca9536: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
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package.json Publish 0.1.0 · Ray 2mo ago
page.json pca9536: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 9d ago
pca9536-etched.fit.json pca9536: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
pca9536-etched.glb pca9536: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 9d ago
pca9536-etched.step pca9536: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 9d ago
pca9536.glb Publish 0.1.0 · Ray 2mo ago
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README.md pca9536: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 1mo ago

PCA9536

Texas Instruments · I2C I/O expander · SOIC-8

Adds four general-purpose I/O pins to a host over I2C/SMBus. Each of the four pins (P0-P3) is independently set as input or output through a configuration register, and the host reads or drives them over a two-wire bus at a fixed address, so a microcontroller short on pins gains four more without extra wiring. Power-on default is all inputs. A small, cheap way to break out a handful of switches, LEDs, or enable lines.

Pinout

Pin Name Type Function
1 P0 bidirectional P-port bit 0. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC. High-current drive (up to ~25 mA sink) sufficient for direct LED drive.
2 P1 bidirectional P-port bit 1. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC.
3 P2 bidirectional P-port bit 2. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC.
4 GND power_in Device ground return. Connect to the system ground plane.
5 P3 bidirectional P-port bit 3. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC.
6 SCL input I2C serial clock input. Open-drain bus line; connect to VCC through an external pull-up resistor. Supports standard mode (100 kHz) and fast mode (400 kHz).
7 SDA bidirectional I2C serial data line. Open-drain bidirectional bus; connect to VCC through an external pull-up resistor.
8 VCC power_in Supply voltage input, 2.3 V to 5.5 V. Bypass locally with a ceramic decoupling capacitor to GND.

Key specifications

Parameter Value
Type 4-bit I2C / SMBus I/O expander
Interface I2C / SMBus (fixed address)
I/O 4 pins (P0-P3), each input or output
Supply 2.3-5.5 V
Bus speed Up to 400 kHz
Default All I/O as inputs at power-on
Package SOIC-8

Ordering variants

Same part, different packaging or reel option.

  • PCA9536D (SOIC-8, tube)
  • PCA9536DR (SOIC-8, tape & reel)
  • PCA9536DGKR (VSSOP-8)

CAD (KiCad official)

  • Symbol: Interface_Expansion:PCA9536D (KiCad official)
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: pca9536-etched.step / pca9536-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); pca9536.step / pca9536.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 bc9e7a06865817ab, retrieved 2026-08-17, tier: manufacturer)
  • 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