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TCA9555PWR

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Texas Instruments I/O Expanders, TSSOP-24. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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TCA9555PWR

Texas Instruments · I/O Expanders · TSSOP-24

TCA9555PWR 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 output Active-low, open-drain interrupt output. Asserts when any input port pin changes state relative to the last read. Connect to VCC through a pull-up resistor.
2 A1 input I2C slave address input 1. Tie directly to VCC or GND to program one of three address bits (combined with A0/A2).
3 A2 input I2C slave address input 2. Tie directly to VCC or GND to program one of three address bits.
4 P00 bidirectional Port 0 bit 0 push-pull I/O. Configured as input at power-on. 5-V tolerant; IOL up to 25 mA (TJ<=65C).
5 P01 bidirectional Port 0 bit 1 push-pull I/O. Configured as input at power-on. 5-V tolerant.
6 P02 bidirectional Port 0 bit 2 push-pull I/O. Configured as input at power-on. 5-V tolerant.
7 P03 bidirectional Port 0 bit 3 push-pull I/O. Configured as input at power-on. 5-V tolerant.
8 P04 bidirectional Port 0 bit 4 push-pull I/O. Configured as input at power-on. 5-V tolerant.
9 P05 bidirectional Port 0 bit 5 push-pull I/O. Configured as input at power-on. 5-V tolerant.
10 P06 bidirectional Port 0 bit 6 push-pull I/O. Configured as input at power-on. 5-V tolerant.
11 P07 bidirectional Port 0 bit 7 push-pull I/O. Configured as input at power-on. 5-V tolerant.
12 GND power_in Ground reference. Continuous current through GND up to 250 mA (abs max).
13 P10 bidirectional Port 1 bit 0 push-pull I/O. Configured as input at power-on. 5-V tolerant.
14 P11 bidirectional Port 1 bit 1 push-pull I/O. Configured as input at power-on. 5-V tolerant.
15 P12 bidirectional Port 1 bit 2 push-pull I/O. Configured as input at power-on. 5-V tolerant.
16 P13 bidirectional Port 1 bit 3 push-pull I/O. Configured as input at power-on. 5-V tolerant.
17 P14 bidirectional Port 1 bit 4 push-pull I/O. Configured as input at power-on. 5-V tolerant.
18 P15 bidirectional Port 1 bit 5 push-pull I/O. Configured as input at power-on. 5-V tolerant.
19 P16 bidirectional Port 1 bit 6 push-pull I/O. Configured as input at power-on. 5-V tolerant.
20 P17 bidirectional Port 1 bit 7 push-pull I/O. Configured as input at power-on. 5-V tolerant.
21 A0 input I2C slave address input 0. Tie directly to VCC or GND to program one of three address bits.
22 SCL input I2C serial clock input (Fast-mode, 400 kHz). Connect to VCC through a pull-up resistor.
23 SDA bidirectional I2C serial data line, open-drain bidirectional. Connect to VCC through a pull-up resistor.
24 VCC power_in Supply voltage input, 1.65 V to 5.5 V. Abs max 6 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • TCA9555PWR
  • TCA9555PWRDBR
  • TCA9555PWRDB
  • TCA9555PWRRTWR
  • TCA9555PWRRTW
  • TCA9555PWRRGER
  • TCA9555PWRRGE

CAD (KiCad official)

  • Symbol: TCA9555PWR
  • Footprint: Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm
  • 3D model: TSSOP-24 (KiCad packages3D, STEP)
  • 3D model files: tca9555pwr-etched.step / tca9555pwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tca9555pwr.step / tca9555pwr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (49 pp, sha256 9706a3ccbf0bc915, 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