component
PCA9545APWR
Public Made by Adomby adom
Texas Instruments Interface - Specialized, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownPCA9545APWR
Texas Instruments · Interface - Specialized · TSSOP-20
PCA9545APWR from Texas Instruments, in a TSSOP-20. 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 | A0 | input | Address input 0; connect directly to VCC or ground. |
| 2 | A1 | input | Address input 1; connect directly to VCC or ground. |
| 3 | RESET | input | Active-low reset input; connect to VDPUM through a pull-up resistor if not used. |
| 4 | INT0 | input | Active-low interrupt input 0; connect to VDPU0 through a pull-up resistor. |
| 5 | SD0 | bidirectional | Serial data 0 for channel 0; connect to VDPU0 through a pull-up resistor. |
| 6 | SC0 | bidirectional | Serial clock 0 for channel 0; connect to VDPU0 through a pull-up resistor. |
| 7 | INT1 | input | Active-low interrupt input 1; connect to VDPU1 through a pull-up resistor. |
| 8 | SD1 | bidirectional | Serial data 1 for channel 1; connect to VDPU1 through a pull-up resistor. |
| 9 | SC1 | bidirectional | Serial clock 1 for channel 1; connect to VDPU1 through a pull-up resistor. |
| 10 | GND | power_in | Ground. |
| 11 | INT2 | input | Active-low interrupt input 2; connect to VDPU2 through a pull-up resistor. |
| 12 | SD2 | bidirectional | Serial data 2 for channel 2; connect to VDPU2 through a pull-up resistor. |
| 13 | SC2 | bidirectional | Serial clock 2 for channel 2; connect to VDPU2 through a pull-up resistor. |
| 14 | INT3 | input | Active-low interrupt input 3; connect to VDPU3 through a pull-up resistor. |
| 15 | SD3 | bidirectional | Serial data 3 for channel 3; connect to VDPU3 through a pull-up resistor. |
| 16 | SC3 | bidirectional | Serial clock 3 for channel 3; connect to VDPU3 through a pull-up resistor. |
| 17 | INT | output | Active-low interrupt output (AND of INT3-INT0); connect to VDPUM through a pull-up resistor. |
| 18 | SCL | bidirectional | I2C serial clock line (master); connect to VDPUM through a pull-up resistor. |
| 19 | SDA | bidirectional | I2C serial data line (master); connect to VDPUM through a pull-up resistor. |
| 20 | VCC | power_in | Supply power (2.3 V to 5.5 V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Communication Interface Chip/UART/485/232 |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
PCA9545APWR - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
pca9545apwr-etched.step/pca9545apwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pca9545apwr.step/pca9545apwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (36 pp, sha256
a7c96385ccaa5910, retrieved 2026-10-03, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).