component
TCA9539RTWR
Public Made by Adomby adom
Texas Instruments I/O Expanders, WQFN-24-EP(4x4). 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
markdownTCA9539RTWR
Texas Instruments · I/O Expanders · WQFN-24-EP(4x4)
TCA9539RTWR from Texas Instruments, in a WQFN-24-EP(4x4). 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 | P00 | bidirectional | P-port input-output. Push-pull design structure. At power on, P00 is configured as an input. |
| 2 | P01 | bidirectional | P-port input-output. Push-pull design structure. At power on, P01 is configured as an input. |
| 3 | P02 | bidirectional | P-port input-output. Push-pull design structure. At power on, P02 is configured as an input. |
| 4 | P03 | bidirectional | P-port input-output. Push-pull design structure. At power on, P03 is configured as an input. |
| 5 | P04 | bidirectional | P-port input-output. Push-pull design structure. At power on, P04 is configured as an input. |
| 6 | P05 | bidirectional | P-port input-output. Push-pull design structure. At power on, P05 is configured as an input. |
| 7 | P06 | bidirectional | P-port input-output. Push-pull design structure. At power on, P06 is configured as an input. |
| 8 | P07 | bidirectional | P-port input-output. Push-pull design structure. At power on, P07 is configured as an input. |
| 9 | GND | power_in | Ground. |
| 10 | P10 | bidirectional | P-port input-output. Push-pull design structure. At power on, P10 is configured as an input. |
| 11 | P11 | bidirectional | P-port input-output. Push-pull design structure. At power on, P11 is configured as an input. |
| 12 | P12 | bidirectional | P-port input-output. Push-pull design structure. At power on, P12 is configured as an input. |
| 13 | P13 | bidirectional | P-port input-output. Push-pull design structure. At power on, P13 is configured as an input. |
| 14 | P14 | bidirectional | P-port input-output. Push-pull design structure. At power on, P14 is configured as an input. |
| 15 | P15 | bidirectional | P-port input-output. Push-pull design structure. At power on, P15 is configured as an input. |
| 16 | P16 | bidirectional | P-port input-output. Push-pull design structure. At power on, P16 is configured as an input. |
| 17 | P17 | bidirectional | P-port input-output. Push-pull design structure. At power on, P17 is configured as an input. |
| 18 | A0 | input | Address input. Connect directly to VCC or ground. |
| 19 | SCL | input | Serial clock bus. Connect to VCC through a pull-up resistor. |
| 20 | SDA | bidirectional | Serial data bus. Connect to VCC through a pull-up resistor. |
| 21 | VCC | power_out | Supply voltage. |
| 22 | INT | output | Interrupt open-drain output. Connect to VCC through a pull-up resistor. |
| 23 | A1 | input | Address input. Connect directly to VCC or ground. |
| 24 | RESET | input | Active-low reset input. Connect to VCC through a pull-up resistor if no active connection is used. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-24-EP(4x4) |
| Category | Interface |
| Pins | 25 |
CAD (KiCad official)
- Symbol:
TCA9539RTWR - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - 3D model: WQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
tca9539rtwr-etched.step/tca9539rtwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tca9539rtwr.step/tca9539rtwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (49 pp, sha256
fec29f61c247a467, retrieved 2026-09-24, tier: lcsc) - 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).