Specifications
| Type | Description |
|---|---|
| Part Number | TCA6424 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | RGJ UQFN-32, 5.00 mm x 5.00 mm body |
| Interface | I2C / SMBus; two-line bidirectional bus using SCL and SDA |
| GPIO Expansion Width | 24-bit; three 8-bit P-port groups P00-P07, P10-P17, P20-P27 |
| Maximum I2C Bus Frequency | 400 kHz; Fast-mode I2C bus |
| VCCI Recommended Supply Voltage | 1.65-5.5 V; supply voltage for I2C bus side |
| VCCP Recommended Supply Voltage | 1.65-5.5 V; supply voltage for P-port side |
| SCL/SDA High-Level Input Voltage | 0.7 x VCCI to 5.5 V; recommended operating conditions |
| ADDR/P-port/RESET High-Level Input Voltage | 0.7 x VCCP to 5.5 V; recommended operating conditions |
| SCL/SDA Low-Level Input Voltage | -0.5 V to 0.3 x VCCI; recommended operating conditions |
| ADDR/P-port/RESET Low-Level Input Voltage | -0.5 V to 0.3 x VCCP; recommended operating conditions |
| P-port High-Level Output Current | 10 mA max; P27-P00, recommended operating conditions |
| P-port Low-Level Output Current | 25 mA max; P27-P00, recommended operating conditions |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating conditions |
| Absolute Maximum VCCI | -0.5 to 6.5 V; supply voltage range |
| Absolute Maximum VCCP | -0.5 to 6.5 V; supply voltage range |
| Absolute Maximum Input Voltage | -0.5 to 6.5 V; input voltage range |
| Absolute Maximum Output Voltage | -0.5 to 6.5 V; output voltage range |
| Continuous P-port Output Low Current | 25 mA max; VO = 0 to VCCP |
| Continuous SDA/INT Output Low Current | 15 mA max; VO = 0 to VCCI |
| Continuous P-port Output High Current | 25 mA max; VO = 0 to VCCP |
| Continuous Current Through GND | 200 mA max; absolute maximum rating |
| Continuous Current Through VCCP | 160 mA max; absolute maximum rating |
| Continuous Current Through VCCI | 10 mA max; absolute maximum rating |
| Package Thermal Impedance | 50.05 °C/W; RGJ package, theta JA, JESD51-7 |
| Storage Temperature | -65 to 150 °C; handling rating |
| ESD Human Body Model | 2000 V; per ANSI/ESDA/JEDEC JS-001, all pins |
| ESD Charged Device Model | 1000 V; per JEDEC JESD22-C101, all pins |
| Input Diode Clamp Voltage | -1.2 V max; II = -18 mA, VCCP = 1.65 V to 5.5 V |
| Power-On Reset Voltage | 1.0 V min, 1.4 V max; VI = VCCP or GND, IO = 0, VCCP = 1.65 V to 5.5 V |
| P-port High-Level Output Voltage at IOH = -8 mA | 1.2 V min at 1.65 V; 1.8 V min at 2.3 V; 2.6 V min at 3 V; 4.1 V min at 4.5 V |
| P-port High-Level Output Voltage at IOH = -10 mA | 1.0 V min at 1.65 V; 1.7 V min at 2.3 V; 2.5 V min at 3 V; 4.0 V min at 4.5 V |
| P-port Low-Level Output Voltage at IOL = 8 mA | 0.45 V max at 1.65 V; 0.25 V max at 2.3 V; 0.25 V max at 3 V; 0.23 V max at 4.5 V |
| P-port Low-Level Output Voltage at IOL = 10 mA | 0.6 V max at 1.65 V; 0.3 V max at 2.3 V; 0.25 V max at 3 V; 0.24 V max at 4.5 V |
| SDA Low-Level Output Current | 3 mA min; VOL = 0.4 V, VCCP = 1.65 V to 5.5 V |
| INT Low-Level Output Current | 3 mA min, 15 mA max; VOL = 0.4 V, VCCP = 1.65 V to 5.5 V |
| SCL/SDA Input Leakage Current | ±0.1 µA max; VI = VCCI or GND, VCCP = 1.65 V to 5.5 V |
| ADDR/RESET Input Leakage Current | ±0.1 µA max; VI = VCCP or GND, VCCP = 1.65 V to 5.5 V |
| P-port High-Level Input Leakage Current | 1 µA max; VI = VCCP, VCCP = 1.65 V to 5.5 V |
| P-port Low-Level Input Leakage Current | 1 µA max; VI = GND, VCCP = 1.65 V to 5.5 V |
| Operating Supply Current at 400 kHz | 8 µA typ, 30 µA max; ICC total, fSCL = 400 kHz, IO = 0, I/O = inputs, VCCP = 1.65 V to 5.5 V |
| Operating Supply Current at 100 kHz | 1.7 µA typ, 10 µA max; ICC total, fSCL = 100 kHz, IO = 0, I/O = inputs, VCCP = 1.65 V to 5.5 V |
| Standby Supply Current | 0.1 µA typ, 2 µA max; fSCL = 0, IO = 0, I/O = inputs, SCL/SDA at VCCI or GND |
| SCL Input Capacitance | 6 pF typ, 7 pF max; VI = VCCI or GND, VCCP = 1.65 V to 5.5 V |
| SDA I/O Capacitance | 7 pF typ, 8 pF max; VIO = VCCI or GND, VCCP = 1.65 V to 5.5 V |
| P-port I/O Capacitance | 7.5 pF typ, 8.5 pF max; VIO = VCCP or GND, VCCP = 1.65 V to 5.5 V |
| Datasheet Status | request_only |
Product Overview
The TCA6424 is a Texas Instruments 24-bit I2C I/O expander in the Signal_Chain category. It uses a two-line bidirectional I2C / SMBus interface with SCL and SDA and supports Fast-mode I2C bus operation up to 400 kHz. GPIO expansion is organized as three 8-bit P-port groups: P00-P07, P10-P17, and P20-P27.
The device has separate recommended supply ranges for the I2C bus side and the P-port side. Both VCCI and VCCP operate from 1.65 V to 5.5 V. SCL and SDA high-level input voltage is specified from 0.7 x VCCI to 5.5 V, while ADDR, P-port, and RESET high-level input voltage is specified from 0.7 x VCCP to 5.5 V.
Output capability includes P-port high-level output current up to 10 mA and low-level output current up to 25 mA under recommended operating conditions. The TCA6424 is specified for -40 to 85 °C free-air operation and is supplied in an RGJ UQFN-32 package with a 5.00 mm x 5.00 mm body for compact board layouts.
Key Features
- 24-bit GPIO expansion through three 8-bit P-port groups
- I2C / SMBus interface using SCL and SDA
- Fast-mode I2C bus operation up to 400 kHz
- Separate VCCI and VCCP supplies from 1.65-5.5 V
- P-port low-level output current up to 25 mA
- P-port high-level output current up to 10 mA
- Operating free-air temperature range of -40 to 85 °C
- Standby supply current of 0.1 µA typical, 2 µA max
- RGJ UQFN-32 package with 5.00 mm square body
- HBM 2000 V and CDM 1000 V ESD ratings
Typical Applications
- I2C GPIO expansion
- SMBus port expansion
- Embedded control interfaces
- P-port input monitoring
- P-port output control
- Interrupt signaling through INT
- Low-current standby systems
- Mixed VCCI and VCCP domains
Procurement Notes
When requesting a quote for TCA6424, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What interface does the TCA6424 use for control?
The TCA6424 uses an I2C / SMBus interface implemented as a two-line bidirectional bus with SCL and SDA. The extracted datasheet facts specify Fast-mode I2C operation up to 400 kHz.
How many GPIO channels are available on the TCA6424?
The TCA6424 provides 24-bit GPIO expansion. The ports are arranged as three 8-bit P-port groups identified as P00-P07, P10-P17, and P20-P27.
What supply voltages are recommended for VCCI and VCCP?
Both recommended supply ranges are 1.65 V to 5.5 V. VCCI is specified for the I2C bus side, while VCCP is specified for the P-port side.
What package is specified for this TCA6424 listing?
The package case is RGJ UQFN-32 with a 5.00 mm x 5.00 mm body. The extracted facts also list package thermal impedance as 50.05 °C/W for the RGJ package.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 7, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.