component
PCF8574RGTR
Public Made by Adomby adom
Texas Instruments I/O Expanders, WQFN-16-EP(3x3). 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
markdownPCF8574RGTR
Texas Instruments · I/O Expanders · WQFN-16-EP(3x3)
PCF8574RGTR from Texas Instruments, in a WQFN-16-EP(3x3). 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 | VCC | power_in | Supply voltage, 2.5V to 6V. |
| 2 | A0 | input | Address input 0; connect directly to VCC or GND without pullups. |
| 3 | A1 | input | Address input 1; connect directly to VCC or GND without pullups. |
| 4 | A2 | input | Address input 2; connect directly to VCC or GND without pullups. |
| 5 | P0 | bidirectional | I/O port 0; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 6 | P1 | bidirectional | I/O port 1; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 7 | P2 | bidirectional | I/O port 2; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 8 | P3 | bidirectional | I/O port 3; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 9 | GND | power_in | Ground. |
| 10 | P4 | bidirectional | I/O port 4; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 11 | P5 | bidirectional | I/O port 5; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 12 | P6 | bidirectional | I/O port 6; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 13 | P7 | bidirectional | I/O port 7; quasi-bidirectional with latched outputs and high-current drive for LEDs. |
| 14 | INT | output | Interrupt output; open-drain, requires external pullup resistor to VCC. |
| 15 | SCL | input | I2C serial clock; open-drain, requires external pullup resistor to VCC. |
| 16 | SDA | bidirectional | I2C serial data; open-drain, requires external pullup resistor to VCC. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-16-EP(3x3) |
| Category | Interface |
| Pins | 17 |
CAD (KiCad official)
- Symbol:
PCF8574RGTR - Footprint:
Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm - 3D model: WQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files:
pcf8574rgtr-etched.step/pcf8574rgtr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pcf8574rgtr.step/pcf8574rgtr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (39 pp, sha256
1549cd0dab0c6b7e, retrieved 2026-09-24, 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).