PCA9703PW,118

I/o Expanders Overview

The PCA9703PW,118 is a low-power 18 V tolerant SPI General Purpose Input (GPI) shift register designed to monitor switch status. It features 16 input ports with interrupt masking capabilities and an open-drain interrupt output. The device operates within a supply voltage range of 4.5 V to 5.5 V, drawing a maximum supply current of 2.5 µA. It supports SPI clock speeds up to 5 MHz and includes ESD protection exceeding 5 kV HBM. The component is available in a TSSOP24 package and complies with AEC-Q100 automotive standards.

I/o Expanders Feature Summary

• 18 V tolerant inputs with integrated ESD protection
• Maskable interrupt generation for selected input pins
• Low power consumption suitable for battery applications
• SPI interface supporting daisy-chain connections

I/o Expanders Applications

• Automotive body control modules
• Electronic control units for switch monitoring
• System Basis Chip wake pin extension
• Industrial equipment input monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix Q900 indicates AEC-Q100 compliance when required for automotive projects. Confirm package availability matches the TSSOP24 designation. Ensure the supplier provides valid RoHS documentation. Check for any specific PPAP requirements if mandated by the end application. Validate that the component version aligns with the latest datasheet revision.

I/o Expanders Selection Notes

Select this component when 18 V tolerance is required for switch monitoring without external level shifting. Ensure the system supply voltage remains between 4.5 V and 5.5 V. Verify that the SPI interface speed does not exceed 5 MHz. Consider the interrupt masking feature if not all inputs require notification. Confirm thermal management requirements for the TSSOP24 package in high-temperature environments.

I/o Expanders Part Context

The PCA9703 belongs to NXP's specialized interface IC family focused on general-purpose input expansion. It complements other GPI expanders by offering higher voltage tolerance and automotive qualification. The device fills the niche for robust switch monitoring in harsh electrical environments where standard logic levels are insufficient.

I/o Expanders Replacement Considerations

PCA9703HF offers the same functionality in an HWQFN24 package. PCA9703PW is the standard non-automotive qualified version in TSSOP24. Verify pin compatibility and electrical specifications before substituting.