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Home > Products > Integrated Circuits (ICs) > Interface > I/O Expanders

Nexperia USA Inc. NCA9555PW-Q100J

Name: NCA9555PW-Q100J
Brand: Nexperia USA Inc.
SKU: NCA9555PW-Q100J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCA9555PW-Q100J

Manufacturer:: Nexperia USA Inc.

Category:: I/O Expanders

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: NCA9555PW-Q100J.pdf

Description:: I2C

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCA9555PW-Q100 from Nexperia is an automotive-grade 16-bit I²C/SMBus GPIO expander with interrupt output, 1.65 V to 5.5 V operation, open-drain INT pin, and configurable input/output registers. It provides parallel I/O expansion for microcontroller systems in space-constrained automotive modules such as body control units, sensor hubs, and LED driver interfaces.

For engineers reviewing the NCA9555PW-Q100 datasheet, NCA9555PW-Q100 pinout, NCA9555PW-Q100 application, or NCA9555PW-Q100 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (-40 °C to +125 °C), 4.0 µA max standby current, 5 V tolerant I/Os, and hardware-configurable I²C slave address via A0–A2 pins.

Technical Context

The device implements dual 8-bit port architecture (P0_0–P0_7 and P1_0–P1_7) with independent configuration, polarity inversion, input, and output registers. All 16 I/Os power up as high-impedance inputs with internal weak pull-ups enabled by default.

Interrupt generation is edge-triggered on any configured input pin change, latched until acknowledged via I²C read of the corresponding input register. The internal power-on reset circuit ensures deterministic initialization at VPORR (rising VCC threshold) and re-enters reset when VCC falls below VPORF.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.65 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V logic domains without level shifters
Operating Temperature	-40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and cabin automotive applications
I²C Bus Speed	Up to 400 kHz Fast-mode - compatible with standard microcontroller I²C peripherals without timing margin concerns
Standby Current	≤ 4.0 µA - enables low-power wake-on-interrupt operation in battery-backed systems
I/O Drive Strength	25 mA max per pin (latched push-pull) - sufficient to directly drive LEDs or small relays without external buffers
ESD Protection	HBM > 2000 V, CDM > 1000 V - robust against handling and board-level ESD events in production and field environments
Input Tolerance	5 V tolerant I/Os - allows safe connection to 5 V peripherals even when VCC = 3.3 V or lower
Interrupt Output	Open-drain active-low INT - enables wired-AND interrupt sharing across multiple expanders on a single MCU IRQ line

Pinout & Package

TSSOP24 (SOT355-1) package: 24-pin thin shrink small outline, 4.4 mm body width, lead pitch 0.65 mm, surface-mount compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
INT (Pin 1)	Interrupt output	Open-drain, active-low signal asserted when any configured input changes state; requires external pull-up to VCC
VCC (Pin 24)	Power supply	Primary supply rail for core logic and I/O drivers; accepts 1.65 V–5.5 V with internal POR circuitry
A0–A2 (Pins 21, 2, 3)	I²C slave address inputs	Hardwired HIGH/LOW to select one of eight possible 7-bit addresses (0x20–0x27); no external resistors needed
SCL / SDA (Pins 22, 23)	I²C bus interface	Bi-directional serial clock/data lines with Schmitt-trigger inputs and internal noise filtering for reliable bus operation
P0_0–P0_7 (Pins 4–11)	Port 0 I/O	8-bit parallel port with individually configurable direction (input/output) and polarity inversion per bit
P1_0–P1_7 (Pins 13–20)	Port 1 I/O	Second 8-bit port with identical register mapping and functionality as Port 0
GND (Pin 12)	Ground reference	Primary return path for VCC and all I/O currents; must be connected to system ground plane

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 certified - validated for reliability in automotive electronics with full temperature and lifetime stress testing
Configurable I/O direction	Per-pin software-selectable input/output via Configuration registers (06h/07h) - eliminates need for external direction-control logic
Input polarity inversion	Independent bit-level inversion via Polarity Inversion registers (04h/05h) - simplifies firmware handling of active-low sensors or switches
No-glitch power-up	Internal POR ensures all registers initialize to known states before I²C communication begins - prevents spurious outputs during boot
Integrated pull-up resistors	Weak internal pull-ups enabled on all I/Os at power-up - reduces BOM count and PCB area for simple switch/sensor interfaces
Latched output capability	25 mA sink/source per I/O - enables direct LED driving or relay coil control without discrete transistors

Applications

Body Control Module (BCM)

Automotive Sensor Hub

Use Scenario: Centralized management of door lock actuators, mirror controls, and interior lighting in modern vehicle BCMs.

IC Role / Device Role / Timing Role: GPIO expander providing 16 additional digital I/Os for microcontroller offload, with interrupt-driven status reporting to reduce polling overhead.

Use Value: Reduces MCU pin count requirement and enables modular design of peripheral interfaces while maintaining AEC-Q100 compliance.

Use Scenario: Aggregation of signals from multiple analog/digital sensors (temperature, humidity, occupancy) in HVAC or ADAS domain controllers.

IC Role / Device Role / Timing Role: Parallel-to-serial bridge translating discrete sensor status bits into I²C-accessible registers with edge-triggered interrupt notification.

Use Value: Eliminates need for dedicated MCU GPIOs per sensor and enables efficient wake-on-event operation in low-power sleep modes.

LED Driver Interface

Pushbutton & Switch Matrix

Use Scenario: Direct driving of multi-segment dashboard indicators and ambient lighting using MCU-controlled GPIO expansion.

IC Role / Device Role / Timing Role: Latched output driver with 25 mA per pin, supporting common-anode or common-cathode LED configurations via software polarity control.

Use Value: Removes external transistor arrays and simplifies thermal layout while maintaining brightness consistency across voltage range (1.65–5.5 V).

Use Scenario: Scanning and debouncing of 16-key keypad or multi-function switch bank in infotainment or center console panels.

IC Role / Device Role / Timing Role: Input port with Schmitt-triggered inputs and interrupt-on-change, reducing CPU polling load and enabling fast response to user interaction.

Use Value: Internal weak pull-ups eliminate external resistors; polarity inversion register simplifies firmware logic for active-low mechanical switches.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PCA9555PW,118	Industrial grade (−40 °C to +85 °C), no AEC-Q100 qualification, identical register map and pinout	Not suitable for automotive under-hood or safety-critical modules requiring Grade 1 temperature range	Select only for non-automotive or cabin-only applications where extended temperature is not required
TCA6424ARGJR	3.3 V only supply, 24-bit I/O, integrated level shifters, different I²C address scheme (0x20–0x27 vs 0x20–0x27)	Higher pin count and larger footprint; better suited for industrial PLC I/O modules than space-constrained automotive ECUs	Choose when >16 I/Os are needed and 3.3 V system bias is fixed; verify interrupt timing compatibility with host MCU

Compared with PCA9555PW,118, the NCA9555PW-Q100 adds automotive qualification and extended temperature support without changing register behavior or pin compatibility. Versus TCA6424ARGJR, it offers smaller footprint and broader voltage flexibility but fewer total I/Os and no built-in level shifting.

Availability

NCA9555PW-Q100 is available at Aetrix Electronics and suitable for automotive body control units, sensor interface modules, LED driver subsystems, and pushbutton matrix interfaces requiring stable component supply across long product lifecycles.

Supply support for NCA9555PW-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 high-volume, high-reliability logic, analog, and MOSFET solutions, with leadership in automotive and industrial power efficiency.

The NCA9555-Q100 belongs to Nexperia's automotive-qualified I/O expander product line, designed specifically to extend microcontroller GPIO resources in harsh-environment automotive electronics while minimizing external components and board area.

FAQ

What is the function of the INT pin and how is it used in system design?

The INT pin is an open-drain, active-low interrupt output that asserts when any configured input pin changes state. It must be pulled up to VCC externally and can be shared across multiple expanders on a single MCU interrupt line. Firmware clears the interrupt by reading the corresponding input port register, ensuring precise event capture without missed edges.

Can the NCA9555PW-Q100 operate with a 1.8 V microcontroller I²C bus while driving 5 V LEDs?

Yes. The device supports 1.65 V to 5.5 V VCC and features 5 V tolerant I/Os. When powered from 1.8 V, its SCL/SDA pins interface safely with 1.8 V MCU logic, while its I/O pins can sink current from 5 V LED anodes through external current-limiting resistors - no level shifter required.

How does the power-on reset (POR) behavior affect system initialization?

The internal POR circuit holds all registers in reset until VCC reaches VPORR (~1.2 V typical), then initializes them to documented defaults (e.g., all I/Os as inputs, output registers = 0xFF). This guarantees deterministic startup without external reset ICs. A full POR cycle requires VCC to drop below VPORF (~0.8 V) and ramp back up.

Are the internal pull-up resistors enabled by default, and can they be disabled?

Yes - all 16 I/Os power up with weak internal pull-ups enabled. These cannot be disabled in hardware but are overridden when a pin is configured as an output or driven externally. For inputs requiring stronger pull-ups or specific values, external resistors may be added in parallel without conflict.

NCA9555PW-Q100J Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Number of I/O:: 16

Interface:: I2C, SMBus

Interrupt Output:: Yes

Features:: POR

Output Type:: Open Drain

Current - Output Source/Sink:: -

Clock Frequency:: -

Voltage - Supply:: 1.65V ~ 5.5V

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP

NCA9555PW-Q100J FAQ

1.How can I place an order for NCA9555PW-Q100J through Aetrix?

Please submit a Request for Quotation (RFQ) for NCA9555PW-Q100J on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for NCA9555PW-Q100J reliable?

The price and inventory of NCA9555PW-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCA9555PW-Q100J is usually 5 days.

3.What payment methods are accepted for NCA9555PW-Q100J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCA9555PW-Q100J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCA9555PW-Q100J?

NCA9555PW-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCA9555PW-Q100J order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for NCA9555PW-Q100J?

For technical support, including NCA9555PW-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCA9555PW-Q100J requirements.

6.How does Aetrix verify that NCA9555PW-Q100J is sourced from the original manufacturer or authorized distributors?

All NCA9555PW-Q100J products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCA9555PW-Q100J meets industry standards.

7.What is the process for return or replacement of NCA9555PW-Q100J?

All NCA9555PW-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with NCA9555PW-Q100J, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The NCA9555PW-Q100J part is unused and in its original packaging.

Return procedure for NCA9555PW-Q100J:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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