TCA9555PWR

Overview

The TCA9555PWR is a remote 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting low-power applications. The device features a maximum clock frequency of 400 kHz for fast data transfer rates. It includes an interrupt output pin to signal state changes to the host microcontroller. The component is housed in a 24-TSSOP surface-mount package with a width of 4.40 mm. It functions reliably across an extended temperature range from -40°C to +85°C. The unit weight is approximately 89.5 mg.

Feature Summary

• Provides 16 general-purpose digital input/output ports expandable via two-wire serial interface
• Configurable polarity inversion registers allow flexible logic level interpretation for inputs
• Open-drain interrupt output pin signals specific port change events to the system processor

Applications

• Server infrastructure management controllers
• Telecommunication exchange equipment routers
• Personal computer peripheral expansion modules
• Industrial automation control panels

Procurement Notes

Verify the exact ordering suffix against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Ensure the component meets RoHS3 compliance requirements for your specific manufacturing process. Confirm availability status as product lifecycles may change without prior notice. Cross-reference the part marking with official documentation to prevent counterfeit substitution during sourcing.

Selection Notes

Select this component when a microcontroller requires additional GPIO lines beyond its native capacity. The wide voltage compatibility allows interfacing with both 1.8V and 5V logic domains. Consider the TSSOP-24 footprint constraints during PCB layout planning. Verify that the I2C bus speed requirements do not exceed the 400 kHz limit specified for reliable operation.

Part Context

This device belongs to the TCA9555 series of I/O expanders designed for bidirectional voltage translation. It serves as a bridge between low-voltage processors and higher-voltage peripheral devices. The series supports standard I2C protocols, ensuring broad compatibility with existing embedded systems architectures developed by various silicon vendors.

Replacement Considerations

The PCA9555PWR is a documented alternative within the same family offering similar functionality. Verify pinout compatibility and register mapping before substituting to ensure seamless integration into existing firmware drivers without code modification.