Nexperia USA Inc. NCA9535PW-Q100J

Overview

NCA9535PW-Q100 from Nexperia is an automotive-qualified 16-bit I²C/SMBus GPIO expander with interrupt output, 1.65 V to 5.5 V operation, open-drain INT pin, and dual 8-bit port registers (P0/P1). It provides configurable input/output direction per pin, polarity inversion, and power-on reset - used in automotive body control modules for sensor interfacing, LED driver coordination, and push-button monitoring.

For engineers reviewing the NCA9535PW-Q100 datasheet, NCA9535PW-Q100 pinout, NCA9535PW-Q100 application, or NCA9535PW-Q100 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 4 µA max standby current, 5 V-tolerant I/Os, 400 kHz Fast-mode I²C support, and TSSOP24 package compatibility with existing PCB footprints.

Technical Context

The device implements a dual-port register architecture (P0_0–P0_7 and P1_0–P1_7), each with independent configuration, input, output, and polarity inversion registers. All 16 I/Os power up as high-impedance inputs, and direction is set via write-accessible Configuration registers (06h/07h).

Interrupt generation is edge-triggered on any configured input pin change, latched until cleared by reading the corresponding Input Port register or by state reversion. The open-drain INT output requires external pull-up and asserts active-low when enabled.

Key Specifications

Pinout & Package

TSSOP24 (SOT355-1) package: 24-pin thin shrink small outline, 4.4 mm body width, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GPIO expander applications.

Compared with PCA9535PW,118, the NCA9535PW-Q100 adds AEC-Q100 Grade 1 qualification and extended temperature support, making it suitable for automotive deployment; versus TPS65987D, it offers dedicated GPIO features including interrupt latching and polarity inversion but lacks USB-C protocol support.

Availability

NCA9535PW-Q100 is available at Aetrix Electronics and suitable for automotive body electronics, infotainment interfaces, and climate control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for NCA9535PW-Q100 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The NCA9535-Q100 belongs to Nexperia's automotive-qualified I/O expander product line, designed specifically to extend microcontroller GPIO resources in space-constrained, thermally demanding automotive subsystems while meeting stringent functional safety and longevity requirements.

FAQ

What is the function of the A0–A2 pins on the NCA9535PW-Q100?

A0, A1, and A2 are hardware address select pins that configure the device's 7-bit I²C slave address. Each pin is tied to VCC (logic 1) or GND (logic 0) to select one of eight possible addresses (0x20–0x27), enabling multiple expanders on the same I²C bus without address conflict.

How does the interrupt output (INT) behave during I²C read operations?

The INT pin remains asserted until the corresponding Input Port register (00h or 01h) is read - the act of reading clears the interrupt latch. If the input state reverts before reading, INT deasserts automatically; otherwise, it stays active until acknowledged via register access.

Can the NCA9535PW-Q100 drive LEDs directly, and what is the maximum current per pin?

Yes - each I/O pin supports up to 25 mA sink/source in push-pull output mode, sufficient for direct LED driving. For optimal current efficiency, connect LEDs between VCC and the I/O pin (sinking configuration), and ensure VCC ≥ LED forward voltage + 1.2 V to avoid excess ICC.

Is the SDA pin 5 V tolerant when the device is powered from 3.3 V?

Yes - all I/O pins including SDA are 5 V tolerant regardless of VCC level (1.65–5.5 V). This allows safe connection to 5 V I²C masters or pull-up resistors while operating from a 3.3 V supply, eliminating external level-shifting circuitry.