CAT9554AHV4I-GT2

Overview

The CAT9554AHV4I-GT2 is an 8-bit I/O expander from onsemi, designed for I2C and SMBus applications. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features interrupt output capabilities and is housed in a TQFN-16 package suitable for surface mount installation. It functions across an industrial temperature range of -40°C to +85°C with a typical operating current of 104 µA. Each I/O pin provides a maximum output current of 3 mA, and the total power dissipation is rated at 1 W.

Feature Summary

• Provides eight general-purpose parallel input/output pins expandable via serial interfaces
• Supports standard I2C and SMBus communication protocols with interrupt generation
• Includes hardware address selection to allow multiple devices on a single bus

Applications

• Portable consumer electronics requiring additional GPIO control
• Industrial systems needing extended input/output capabilities under varying voltage conditions
• Embedded controllers managing peripheral devices such as sensors or switches

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to end-of-life status. Confirm RoHS compliance documentation matches specific manufacturing lots. Review datasheet revisions for any functional updates prior to integration into new designs.

Selection Notes

Select this component when 8-bit expansion with interrupt support is required in compact surface-mount packages. Ensure system voltage aligns with the 2.3 V to 5.5 V operational range. Consider thermal management requirements given the 1 W power dissipation limit in the TQFN-16 form factor.

Part Context

Part of the CAT9554A series offering enhanced drive strength compared to earlier generations. Designed for compatibility with standard I2C/SMBus architectures while providing improved performance metrics for modern embedded applications requiring reliable GPIO expansion.

Replacement Considerations

Consult official substitution guides for equivalent 8-bit I/O expanders with similar interface and package constraints. Verify pinout compatibility and electrical specifications before replacing in existing assemblies.