Nexperia USA Inc. NCA9535PWJ

Overview

NCA9535PWJ from Nexperia is a low-voltage 16-bit I²C/SMBus GPIO expander with interrupt output, configuration registers, and 1.65 V to 5.5 V operation. It provides two 8-bit I/O ports (P0_0–P0_7 and P1_0–P1_7), open-drain INT output, and hardware-configurable slave address via A0–A2 pins. Used in ACPI power switches, sensor interfaces, LED/fan control, and keypad expansion where minimal interconnect and interrupt-driven event handling are required.

For engineers reviewing the NCA9535PWJ datasheet, NCA9535PWJ pinout, NCA9535PWJ application, or NCA9535PWJ equivalent, key selection considerations include its 400 kHz Fast-mode I²C support, 2.5 µA max standby current, 5 V-tolerant I/Os, push-pull output drive (25 mA), and power-on reset behavior with no glitch on startup.

Technical Context

The NCA9535PWJ implements a dual-port register architecture with four 8-bit register pairs: Input (00h/01h), Output (02h/03h), Polarity Inversion (04h/05h), and Configuration (06h/07h). All I/Os default to high-impedance inputs at power-up, and direction is set per-pin via the Configuration registers.

Its interrupt logic asserts the open-drain INT pin on any input state change relative to the Input Port register value; the interrupt clears upon reading the corresponding port register or when the pin reverts to its prior logic level. Schmitt-trigger inputs and noise filtering on SCL/SDA ensure robust bus operation across voltage rails.

Key Specifications

Pinout & Package

TSSOP24 (SOT355-1) package: 24-lead, 4.4 mm body width, 0.65 mm pitch, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA6408A and PCA9535, the NCA9535PWJ delivers full 16-bit expandability with 25 mA drive, industrial temperature range, and superior CDM ESD protection-making it optimal for space-constrained, noise-prone, or thermally demanding designs requiring reliable interrupt-driven I/O.

Availability

NCA9535PWJ is available at Aetrix Electronics and suitable for ACPI power management, sensor hub integration, LED/fan control, and keypad expansion requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for NCA9535PWJ 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, high-reliability components for automotive, industrial, and consumer applications.

The NCA9535 belongs to Nexperia's low-power I²C GPIO expander product line, designed specifically for minimizing interconnect complexity and enabling interrupt-driven peripheral management in resource-constrained embedded systems.

FAQ

What is the function of the A0, A1, and A2 pins on the NCA9535PWJ?

These are hardware address select pins that determine 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). No external pull-up/down resistors are required-the pins are internally biased only during power-up reset and rely on hardwired connections for stable addressing.

How does the interrupt (INT) pin behave, and what triggers it?

The INT pin is an open-drain, active-low output that asserts when any GPIO configured as an input changes state relative to its value in the Input Port register. It de-asserts automatically when the corresponding port register is read or when the pin returns to its original logic level. The interrupt remains active until cleared by one of these conditions-no software clearing is required.

Can the NCA9535PWJ drive LEDs directly, and what are the current limits?

Yes-the NCA9535PWJ supports direct LED driving via its push-pull outputs, with a maximum sink current of 25 mA per I/O pin. When used in sink mode (LED anode to VCC, cathode to GPIO), it fully meets typical indicator LED requirements. For source-mode driving, external current-limiting resistors must be placed between VCC and the LED anode to avoid exceeding the 25 mA limit.

Is the NCA9535PWJ compatible with 1.8 V microcontrollers, and how are level mismatches handled?

Yes-the device operates down to 1.65 V and features 5 V-tolerant I/Os, allowing direct connection to 1.8 V MCUs while interfacing with 5 V peripherals. SDA and SCL require pull-up resistors to the MCU's I²C bus voltage (e.g., 1.8 V), and all GPIOs maintain correct logic thresholds across the full 1.65–5.5 V VCC range without external level shifters.