NCA9539PWJ

I/o Expanders Overview

The NCA9539PWJ is a low-voltage 16-bit I/O expander designed for I²C-bus and SMBus applications. It provides General Purpose Input/Output expansion with interrupt and reset capabilities, operating within a wide voltage range of 1.65 V to 5.5 V. The device features 16 configurable I/O pins that default to inputs at power-up, an open-drain active LOW interrupt output, and a dedicated RESET pin. It supports Fast-mode communication up to 400 kHz and includes Schmitt-trigger inputs for noise immunity. The component is housed in a TSSOP24 package (SOT355-1) and is specified for operation from -40 °C to +85 °C.

I/o Expanders Feature Summary

• I²C-bus to parallel port expander with hardware selectable slave addresses
• Low standby current consumption with Schmitt-trigger action on SCL and SDA inputs
• Open-drain active LOW interrupt output activated by GPIO state changes
• Reset input for resetting registers and state machine without power cycling

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'J' against the manufacturer's official documentation to confirm packaging details such as tape and reel specifications or marking codes. Ensure the procurement channel sources directly from authorized Nexperia distributors to guarantee authenticity and traceability of the TSSOP24 packaged components.

I/o Expanders Selection Notes

Select this component when a system requires expanding microcontroller I/O lines via I²C or SMBus protocols. It is suitable for designs needing 16 additional digital inputs or outputs with interrupt-driven notification capabilities. Consider the TSSOP24 package dimensions and the 1.65 V to 5.5 V supply voltage range to ensure compatibility with the target application's power architecture.

I/o Expanders Part Context

The NCA9539 belongs to Nexperia's family of low-power I/O expanders. The PWJ variant specifically denotes the TSSOP24 plastic thin shrink small outline package version. This series is engineered to minimize interconnections in embedded systems, offering a compact solution for adding GPIO functionality without consuming excessive PCB real estate or complex interface logic.

I/o Expanders Replacement Considerations

NCA9539PW-Q100J: Automotive qualified version with extended temperature range up to +125 °C and AEC-Q100 certification. NCA9539BYHP: Alternative HWQFN24 package option for space-constrained designs.