TCA6408APWR

Overview

The TCA6408APWR is an 8-bit I/O expander designed for I2C and SMBus protocols. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting bidirectional voltage translation between the host processor and peripheral devices. The device features eight general-purpose digital input/output pins with configurable open-drain outputs capable of sourcing or sinking up to 25 mA. It includes an interrupt output pin that signals state changes on inputs. The component supports standard (100 kHz) and fast-mode (400 kHz) clock frequencies. It is housed in a 16-pin TSSOP package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Bidirectional voltage translation capability allows seamless interfacing between hosts and peripherals operating at different logic levels.
• Configurable interrupt output mechanism provides efficient event-driven notification for input state changes without continuous polling.
• Low standby current consumption ensures minimal power usage during idle periods, suitable for battery-operated applications.

Applications

• Portable consumer electronics requiring low-power GPIO expansion
• Industrial control systems utilizing I2C/SMBus communication
• Automotive infotainment and instrument cluster interfaces

Procurement Notes

Verify the specific suffix 'PWR' corresponds to the TSSOP-16 tube packaging variant when sourcing. Confirm the 'A' designation indicates the specific revision level required for your design. Ensure compatibility with your system's I2C address configuration before procurement. Check for RoHS compliance status relevant to your manufacturing region requirements.

Selection Notes

Select this component when an 8-bit expansion is sufficient for the application. Choose this part over higher-pin-count variants if board space is limited. Ensure the host controller supports the required I2C clock speeds. Verify that the open-drain output configuration meets the load requirements of the connected peripherals.

Part Context

This device belongs to the TCA6408 family of I/O expanders from Texas Instruments. It shares functional similarities with other members like the TCA6408ARSVR but differs in package type. The family is designed for cost-effective GPIO expansion in embedded systems. It complements Texas Instruments' broader portfolio of interface ICs focused on serial bus connectivity.

Replacement Considerations

The TCA6408PWG4 is a direct lead-free replacement for the TCA6408APWR, maintaining identical electrical characteristics and pinout. Both parts belong to the same functional family. Verify package tolerance compatibility during substitution. No functional changes are expected between these two variants.