PCA9553D/01,118

Overview

The PCA9553D/01,118 is a linear LED driver IC manufactured by NXP USA Inc., housed in an 8-TSSOP surface-mount package. It features four open-drain outputs capable of sinking up to 25 mA per channel and 100 mA per package. The device operates on a supply voltage range of 2.3 V to 5.5 V and supports I²C bus communication at frequencies up to 400 kHz. It includes an internal oscillator for programmable blink rates and allows unused bits to function as general-purpose I/O.

Feature Summary

• Integrates an internal oscillator to enable programmable LED blinking without external components or continuous bus traffic.
• Supports dual programmable blink rates with adjustable frequency and duty cycle for flexible visual signaling.
• Allows non-LED output channels to be configured as general-purpose parallel input/output expansion.

Applications

• I²C-bus and SMBus applications requiring limited bus traffic
• System status indication where MCU timers need to be freed
• General-purpose I/O expansion alongside LED control

Procurement Notes

Verify the specific suffix /01,118 against the official NXP datasheet to confirm the fixed I²C address configuration. Ensure the 8-TSSOP package dimensions match the target PCB footprint. Confirm that the 25 mA sink current per channel meets the load requirements before finalizing the component selection.

Selection Notes

Select this component when reducing I²C bus overhead is critical compared to standard GPIO expanders. It is suitable for designs requiring hardware-managed LED blinking rather than software-driven toggling. Verify that the fixed I²C address does not conflict with other devices on the same bus segment.

Part Context

This part belongs to the PCA9553 family of LED blinkers designed to offload timing tasks from microcontrollers. Unlike standard I/O expanders like the PCF8574, it provides dedicated hardware blink functionality. The /01 variant specifies a distinct I²C address to allow coexistence with other variants on the same bus.

Replacement Considerations

PCA9553DP/01,118 is listed as a parameter-equivalent alternative available through Rochester Electronics, LLC.