Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| GPIO | 24 configurable I/O pins |
| Voltage Translation | 1.65 V to 5.5 V I²C/P-port domains |
| Bus | 400-kHz Fast I²C |
| Control | Active-low RESET and open-drain INT |
| Startup | All channels inputs; no-glitch power-up |
| Standby | 1 µA stated standby current |
| I/O | 5-V tolerant P ports with polarity/configuration registers |
| Exact Package / Packing | UQFN (RGJ), 32 pins; 3000-piece large tape and reel |
Product Overview
TCA6424ARGJR provides 24 remote GPIOs in one translating I²C device, targeting boards where connector/control/status pin count is high but MCU pins are scarce. Its voltage-domain flexibility allows the I²C side and P-port side to operate at different common logic voltages.
A single 24-bit expander can reduce device count relative to multiple 8-bit parts, but it also concentrates many board functions behind one I²C address and interrupt. Firmware fault handling should account for the larger impact of a bus/device failure.
The RGJR exact order code is the 32-pin leadless large-reel option. Dense pin fan-out and exposed-pad soldering should be validated before production.
For related devices, see HKEQGOO’s I/O Expanders category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TCA6424ARGJR |
| GPIO | 24 configurable I/O pins |
| Voltage Translation | 1.65 V to 5.5 V I²C/P-port domains |
| Bus | 400-kHz Fast I²C |
| Control | Active-low RESET and open-drain INT |
| Startup | All channels inputs; no-glitch power-up |
| Standby | 1 µA stated standby current |
| I/O | 5-V tolerant P ports with polarity/configuration registers |
| Exact Package / Packing | UQFN (RGJ), 32 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | PH424A |
Functional Highlights
High GPIO density lowers I²C device count
Fewer expander addresses and packages can simplify BOM and routing, particularly for server/industrial status/control banks.
A single interrupt summarizes many inputs
INT can signal any changed input, but software must read the relevant port banks to locate the source. Interrupt-service latency grows with the number of inputs and bus traffic.
Design Considerations
- Map safety- or time-critical controls separately if one shared I²C expander would create an unacceptable common failure point.
- Budget interrupt-service/read time for 24 inputs at the actual bus speed.
- Use the exact RGJ land pattern and verify solder coverage/fan-out around the exposed pad.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TCA6424ARGJR as Active / Production; UQFN (RGJ), 32 pins; 3000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +85°C; marking PH424A.
Related Engineering Resources
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