component
PCF8574APWR
Public Made by Adomby adom
Texas Instruments I/O Expanders, ETSSOP-20. Datasheet-verified pinout, 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
markdownPCF8574APWR
Texas Instruments · I/O Expanders · ETSSOP-20
PCF8574APWR from Texas Instruments, in a ETSSOP-20. 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 | Open-drain interrupt output, connect through pullup resistor to VCC, asserted on rising or falling edge of port inputs. |
| 2 | SCL | input | Serial clock input for I2C interface, connect through pullup resistor to VCC. |
| 3 | NC | unconnected | Do not connect. |
| 4 | SDA | bidirectional | Serial data line for I2C interface, connect through pullup resistor to VCC. |
| 5 | VCC | power_in | Positive power supply voltage, 2.5V to 6V. |
| 6 | A0 | input | Address input 0, connect directly to VCC or ground, pullup resistors not needed. |
| 7 | A1 | input | Address input 1, connect directly to VCC or ground, pullup resistors not needed. |
| 8 | NC | unconnected | Do not connect. |
| 9 | A2 | input | Address input 2, connect directly to VCC or ground, pullup resistors not needed. |
| 10 | P0 | bidirectional | Quasi-bidirectional I/O port 0 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 11 | P1 | bidirectional | Quasi-bidirectional I/O port 1 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 12 | P2 | bidirectional | Quasi-bidirectional I/O port 2 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 13 | NC | unconnected | Do not connect. |
| 14 | P3 | bidirectional | Quasi-bidirectional I/O port 3 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 15 | GND | power_in | Ground reference. |
| 16 | P4 | bidirectional | Quasi-bidirectional I/O port 4 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 17 | P5 | bidirectional | Quasi-bidirectional I/O port 5 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 18 | NC | unconnected | Do not connect. |
| 19 | P6 | bidirectional | Quasi-bidirectional I/O port 6 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 20 | P7 | bidirectional | Quasi-bidirectional I/O port 7 with push-pull high-current drive capability suitable for directly driving LEDs. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | ETSSOP-20 |
| Category | Interface |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
PCF8574APWR - Footprint:
Package_SO:ETSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP3x4.2mm - 3D model: ETSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
pcf8574apwr-etched.step/pcf8574apwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pcf8574apwr.step/pcf8574apwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (36 pp, sha256
d16c2f223be49bd7, retrieved 2026-09-17, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).