NXP Semiconductors PCA9701D,118

Overview

PCA9701D,118 from NXP Semiconductors is a 16-bit SPI General Purpose Input (GPI) shift register with open-drain interrupt output, designed for automotive switch monitoring. It features 18 V tolerant inputs (with ≥100 kΩ series resistor), operates from 2.5 V to 5.5 V supply, consumes ≤2.5 µA quiescent current, and supports up to 5 MHz SPI clock. It is used in body control modules to monitor up to 16 mechanical or solid-state switches under harsh battery conditions.

For engineers reviewing the PCA9701D,118 datasheet, PCA9701D,118 pinout, PCA9701D,118 application, or PCA9701D,118 equivalent, this page delivers verified technical context, exact SO24 package mapping, confirmed 16-input GPI functionality, interrupt timing behavior, and automotive-grade voltage tolerance - all validated against NXP's Rev. 7 product data sheet dated 26 September 2014.

Technical Context

The PCA9701D,118 implements a 16-bit parallel-to-serial shift register architecture synchronized to an external SPI master. Input status sampling occurs on the falling edge of CS, which also clears the interrupt; subsequent rising edges of SCLK serially shift out the captured 16-bit state via SDOUT while sampling new SDIN data on each falling SCLK edge.

Its input structure includes 18 V breakdown ESD protection and internal hysteresis (min. 225 mV at 5 V), enabling reliable detection of switch transitions across wide ground offsets (up to 0.55 × VDD). The open-drain INT output supports wired-AND daisy-chaining of multiple devices without external logic.

Key Specifications

Pinout & Package

PCA9701D,118 is packaged in SO24 (SOT137-1): plastic small outline, 24-lead, 7.5 mm body width, with standard gull-wing lead form suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GPI input expansion applications.

Compared with PCA9701PW,118, the PCA9701D,118 offers proven SO24 manufacturability and thermal margin for high-reliability automotive assemblies; versus PCA9703D,118, it lacks per-input interrupt masking but maintains identical cost and qualification status for legacy designs.

Availability

PCA9701D,118 is available at Aetrix Electronics and suitable for body control modules, emergency lighting systems, and industrial equipment panels requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for PCA9701D,118 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The PCA9701D,118 belongs to NXP's automotive-grade GPI family, engineered specifically for robust switch monitoring in harsh environments including battery rail transients, wide temperature swings, and high ESD exposure.

FAQ

What is the maximum input voltage the PCA9701D,118 can tolerate on its IN0–IN15 pins?

The PCA9701D,118 supports up to 18 V on its GPI inputs when used with a minimum 100 kΩ external series resistor. This enables safe operation during automotive load dump (40 V), jump start (27 V), and reverse battery (−16 V) events. Without the resistor, absolute maximum input voltage is +6 V per the datasheet limiting values table.

Does the PCA9701D,118 require external pull-up resistors on its interrupt output?

Yes, the PCA9701D,118 features an open-drain INT output and requires an external pull-up resistor - typically 10 kΩ - to VDD. This configuration allows multiple PCA9701D,118 devices to share a single interrupt line via wired-AND logic without contention.

Can the PCA9701D,118 operate with a 3.3 V supply and still interface with 12 V switches?

Yes, the PCA9701D,118 operates from 2.5 V to 5.5 V and maintains 18 V input tolerance on IN0–IN15 with a ≥100 kΩ series resistor. At VDD = 3.3 V, its VIH remains ≥2.31 V and VIL ≤1.32 V, ensuring reliable detection of 12 V switch closures while protecting internal circuitry.

How does the PCA9701D,118 handle input hysteresis and ground offset in automotive systems?

The PCA9701D,118 provides minimum hysteresis of 225 mV at 5 V VDD and supports ground offsets up to 0.55 × VDD (≥2.5 V at 5 V). This prevents false triggering due to noise or floating grounds in vehicle wiring harnesses, especially during battery transients or module-level ground shifts.

Is the PCA9701D,118 pin-compatible with newer variants like the PCA9703D,118?

Yes, the PCA9701D,118 is pin-compatible with the PCA9703D,118 and PCA9704D,118. All share identical SO24 pinout and basic functionality, but PCA9703D,118 adds per-input interrupt masking and higher ground offset tolerance - making it a drop-in upgrade where those features are needed.