NCA9555PWJ

I/o Expanders Overview

The NCA9555PWJ is a low-voltage 16-bit I²C and SMBus I/O expander manufactured by Nexperia. It provides General Purpose Input/Output (GPIO) expansion for applications requiring additional IOs while minimizing interconnections. The device operates within a wide voltage range of 1.65 V to 5.5 V and features an open-drain interrupt output activated when GPIO states change. It includes eight 8-bit registers for input, output, configuration, and polarity inversion. All I/Os default to inputs at power-up with weak pull-up resistors. The component supports Fast-mode I²C bus communication up to 400 kHz and allows up to eight devices on the same bus via hardware address pins A0, A1, and A2.

I/o Expanders Feature Summary

• I²C-bus to parallel port expander with configurable direction settings
• Low standby current consumption with Schmitt-trigger action for noise immunity
• Open-drain active LOW interrupt output triggered by input state changes
• Internal power-on reset ensuring glitch-free initialization

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button controls
• LED driving systems
• Fan control circuits

I/o Expanders Procurement Notes

Verify the ordering suffix 'J' corresponds to the TSSOP24 package variant as specified in the official datasheet. Confirm that the procurement documentation matches the Rev. 4 product data sheet dated November 29, 2024. Ensure the supplier provides traceability to the Nexperia manufacturing source. Cross-reference the Mouser part number 771-NCA9555PWJ if utilizing distributor channels for identification purposes.

I/o Expanders Selection Notes

Select this component when expanding I²C or SMBus capabilities with minimal wiring overhead. It is suitable for designs requiring 16 configurable GPIOs with interrupt functionality. Consider the 1.65 V to 5.5 V operating range for compatibility with various logic levels. The TSSOP24 package is appropriate for standard surface-mount assembly processes requiring thermal management considerations.

I/o Expanders Part Context

The NCA9555 series serves as a general-purpose GPIO expander within Nexperia's interface IC portfolio. It addresses the need for scalable input/output expansion in embedded systems without increasing microcontroller pin counts. The PWJ designation specifically identifies the plastic thin shrink small outline package variant designed for high-density PCB layouts.

I/o Expanders Replacement Considerations

Direct functional substitutes include other 16-bit I²C I/O expanders from compatible manufacturers. Verify pinout compatibility and register mapping before substitution. Alternative packages such as HWQFN24 are available under the NCA9555BY designation.