NCA9555BYHP

I/o Expanders Overview

The NCA9555BYHP is a low-voltage 16-bit I²C and SMBus I/O expander manufactured by Nexperia, housed in an HWQFN24 package (SOT8041-1). It operates within a supply voltage range of 1.65 V to 5.5 V and supports Fast-mode communication up to 400 kHz. The device features 16 configurable I/O pins that default to inputs with weak pull-up resistors upon power-up. Key electrical specifications include a maximum standby current of 2.5 µA, open-drain active LOW interrupt output, and latch-up performance exceeding 100 mA per JESD78 Class II. It functions reliably across a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16 bits of General Purpose Input/Output expansion for I²C-bus/SMBus applications
• Features Schmitt-trigger action and noise filters on SCL and SDA inputs for improved noise immunity
• Includes an open-drain active LOW interrupt output activated by GPIO state changes
• Supports hardware-selectable slave addresses via three address pins

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 specific ordering suffix BYHP corresponds to the HWQFN24 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the selected distributor provides valid traceability data for the component batch. Cross-reference the part number against the latest product change notifications to confirm manufacturing continuity.

I/o Expanders Selection Notes

Select this component when expanding I/O capabilities in space-constrained designs requiring minimal interconnections. The wide operating voltage range allows compatibility with various logic levels. Consider the internal weak pull-up resistors for input configurations to reduce external component count. Verify that the required interrupt functionality aligns with the open-drain INT pin specification.

I/o Expanders Part Context

The NCA9555BYHP belongs to the NCA9555 series of low-voltage I/O expanders from Nexperia. This series is designed to provide elegant solutions for adding inputs and outputs while keeping interconnections to a minimum. The BYHP designation specifically identifies the HWQFN24 package version, distinguishing it from other variants like the TSSOP24 package.

I/o Expanders Replacement Considerations

NCA9555PWJ is a confirmed substitute part number offering identical functional specifications but utilizing a TSSOP24 package instead of HWQFN24.