Nexperia USA Inc. NCA9539PW-Q100J

Overview

NCA9539PW-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 16-bit I²C/SMBus GPIO expander with interrupt output, active-low reset pin, and configurable polarity/inversion registers. It operates from 1.65 V to 5.5 V, delivers up to 25 mA per I/O, supports 400 kHz Fast-mode I²C, and powers up with all 16 pins as high-impedance inputs - enabling immediate use in automotive body control modules for sensor interfacing and LED driver consolidation.

For engineers reviewing the NCA9539PW-Q100 datasheet, NCA9539PW-Q100 pinout, NCA9539PW-Q100 application, or NCA9539PW-Q100 equivalent, key selection criteria include its 5 V-tolerant I/Os, open-drain INT signal timing (tv(INT) guaranteed), Schmitt-trigger SCL/SDA inputs (Vhys = 0.10 × VCC), and dual-register configuration architecture supporting independent port 0/port 1 read/write operations.

Technical Context

The device 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). Each port (P0_0–P0_7, P1_0–P1_7) is individually configurable as input or output via the Configuration registers, and input polarity can be inverted per-bit using the Polarity Inversion registers.

Interrupt generation is edge-triggered on any configured input pin change, latched until cleared by reading the corresponding Input Port register or when the pin returns to its prior state. The internal power-on reset and external RESET pin both initialize all registers to default values (e.g., Configuration = 0xFF, Output = 0xFF, Polarity = 0x00), ensuring deterministic startup behavior without I²C bus interaction.

Key Specifications

Pinout & Package

TSSOP24 package (SOT355-1), 24-pin plastic thin shrink small outline, 4.4 mm body width, lead pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA9539PWR and PCA9539DP, the NCA9539PW-Q100 uniquely combines AEC-Q100 Grade 1 qualification, 1.65–5.5 V operation, and 4 µA standby current - making it the sole option for new automotive designs requiring extended temperature range, low-power always-on capability, and functional safety alignment.

Availability

NCA9539PW-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, infotainment front panels, and climate control actuators requiring stable component supply across multi-year production cycles and regional manufacturing sites.

Supply support for NCA9539PW-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 logic, analog, and MOSFET solutions optimized for automotive, industrial, and mobile applications.

The NCA9539-Q100 belongs to Nexperia's automotive-qualified I/O expansion portfolio, designed specifically to simplify wiring harnesses and reduce MCU pin count in vehicle subsystems operating under extreme thermal and electrical stress.

FAQ

What is the minimum VCC required for reliable I²C communication?

The NCA9539PW-Q100 supports I²C operation down to 1.65 V VCC. At this voltage, SDA and SCL maintain full Schmitt-trigger hysteresis (Vhys = 0.10 × VCC ≈ 165 mV) and meet Fast-mode timing specs (tSU;STA ≥ 260 ns, tHD;STA ≥ 1 μs) per the datasheet. Below 1.65 V, register access and interrupt assertion are not guaranteed.

Can the INT pin be used without an external pull-up resistor?

No. The INT pin is open-drain and requires an external pull-up resistor to VCC. Typical values range from 4.7 kΩ to 10 kΩ depending on bus capacitance and MCU input threshold. Omitting the pull-up results in undefined logic levels and failure to assert interrupts to the host controller.

How does the polarity inversion register affect interrupt generation?

The polarity inversion register (04h/05h) flips the logic sense of input pins *only* in the Input Port register - it does not alter physical pin behavior or interrupt triggering. Interrupts are still generated on actual pin transitions (rising/falling edges), regardless of inversion setting. The register solely affects how the read-back value appears in the Input Port register.

Is the RESET pin synchronous or asynchronous to the I²C clock?

The RESET pin is fully asynchronous - asserting it LOW immediately forces all registers, I/O states, and the I²C state machine to their power-on defaults, independent of SCL activity or ongoing bus transactions. The device remains in reset until RESET returns HIGH, with no clock dependency or timing constraints relative to I²C timing parameters.