Nexperia USA Inc. NCA9595PW-Q100J

Overview

NCA9595PW-Q100 from Nexperia is an automotive-grade 16-bit I²C/SMBus GPIO expander with interrupt output, programmable pull-up resistors, and configurable input/output direction per pin. It operates from 1.65 V to 5.5 V, supports −40 °C to +125 °C, and features open-drain INT, 4 µA max standby current, and 25 mA output drive for direct LED control - used in automotive body control modules, sensor interface hubs, and HVAC actuator interfaces.

For engineers reviewing the NCA9595PW-Q100 datasheet, NCA9595PW-Q100 pinout, NCA9595PW-Q100 application, or NCA9595PW-Q100 equivalent, key selection criteria include I²C address configurability (A0–A2), polarity inversion register support, power-on reset behavior, interrupt edge sensitivity, and 5 V-tolerant I/O compatibility with mixed-voltage systems.

Technical Context

The device implements a dual 8-bit port architecture (P0_0–P0_7 and P1_0–P1_7) with independent configuration, polarity inversion, and pull-up enable registers. All 16 I/Os power up as high-impedance inputs with enabled 100 kΩ pull-ups, and each pin's direction is set via dedicated bits in Configuration Port 0/1 (06h/07h).

Interrupt generation is triggered by any input state change relative to the Input Port register value, with INT asserted low and cleared automatically on read acknowledgment or return to original state. The internal power-on reset initializes all registers to documented defaults and synchronizes the I²C state machine without external reset circuitry.

Key Specifications

Pinout & Package

TSSOP24 package (SOT355-1), 4.4 mm body width, 0.65 mm pitch - optimized for compact automotive PCB layouts with thermal and mechanical reliability under vibration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCA9555DWR and TCA6424ARGJR, the NCA9595PW-Q100 uniquely combines AEC-Q100 Grade 1 qualification, 1.65–5.5 V operation, per-pin pull-up disable, and polarity inversion - making it the only option for robust, mixed-voltage automotive GPIO expansion requiring deterministic interrupt behavior and zero-power optimization.

Availability

NCA9595PW-Q100 is available at Aetrix Electronics and suitable for automotive body control units, HVAC actuator interfaces, industrial sensor hubs, and infotainment keypad subsystems requiring stable component supply across extended temperature and lifecycle demands.

Supply support for NCA9595PW-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, and scalable components for automotive, industrial, and consumer markets.

The NCA9595-Q100 belongs to Nexperia's automotive-qualified I²C GPIO expander product line, designed specifically to simplify wiring complexity and enhance functional safety in distributed vehicle electronics architectures.

FAQ

What is the default I/O configuration at power-up?

At power-on reset, all 16 GPIO pins (P0_0–P0_7 and P1_0–P1_7) default to high-impedance inputs with internal 100 kΩ pull-up resistors enabled. Configuration registers (06h/07h) power up with all bits set to 1, and output registers (02h/03h) initialize to 0xFF - ensuring no unintended output states or current paths.

How does the interrupt output behave during I²C read operations?

The INT signal is automatically de-asserted on the ACK/NACK clock pulse following a read from the input port register that triggered the interrupt. If multiple pins change simultaneously, INT remains active until all corresponding input port values are read and acknowledged - preventing missed edge events in burst-read scenarios.

Can the NCA9595PW-Q100 drive LEDs directly without external current-limiting resistors?

No - external series resistors are mandatory. Although the device supports 25 mA per pin, LED forward voltage and system VCC determine required resistance. For example, with a 2.1 V red LED and 3.3 V VCC, a minimum 47 Ω resistor is needed to limit current to 25 mA; omitting it risks exceeding absolute maximum ratings and damaging the output FET.

Is the SDA pin truly bidirectional, and how is direction controlled?

Yes - SDA is bidirectional and internally switched between input and output modes by the I²C state machine. During master transmit, the device drives SDA low for '0' and releases it (high-impedance) for '1', relying on the external pull-up. During master receive, the device samples SDA as an input. No software or register control is required - direction is fully automatic and compliant with I²C specification.