NXP Semiconductors MCZ33972AEKR2

Overview

MCZ33972AEKR2 from NXP Semiconductors is a 22-input automotive-grade multiple switch detection interface IC with suppressed wake-up, SPI communication, and integrated analog multiplexer. It supports 8 programmable (switch-to-battery or switch-to-ground) and 14 dedicated switch-to-ground inputs, operates from 5.5–26 V VPWR, delivers 100 µA sleep current, and interfaces directly to 3.3/5.0 V MCUs for vehicle body control modules.

For engineers reviewing the MCZ33972AEKR2 datasheet, MCZ33972AEKR2 pinout, MCZ33972AEKR2 application, or MCZ33972AEKR2 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional differences, and supply-chain support for automotive OEM and Tier-1 production programs.

Technical Context

The MCZ33972AEKR2 implements dual-mode operation-Normal mode enables full SPI register programming, wetting current control (16 mA or 2.0 mA), and real-time switch status reporting; Sleep mode reduces VPWR supply current to 100 µA while maintaining wake-up capability via WAKE, INT, or switch state change. Its internal 4.0 V reference comparator validates switch closure across all 22 inputs with ±10 mV offset voltage on AMUX output.

It integrates a 22:1 analog multiplexer feeding buffered signals to the AMUX pin, allowing MCU ADC sampling of switch inputs as analog voltages. The SPI interface operates up to 6.0 MHz (production-tested at 4.16 MHz), with strict timing requirements including 16 ns SI setup time and 25 ns SO data validity after SCLK rise-ensuring deterministic communication in noisy automotive environments.

Key Specifications

Pinout & Package

MCZ33972AEKR2 is housed in a 32-pin SOICW EP (exposed pad) package, RoHS-compliant with EK suffix, optimized for thermal dissipation in under-hood automotive modules. The exposed pad must be connected to GND for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar switch detection interface applications.

Compared with MCZ33972AEKR2, MC33972ATEK/R2 offers identical functionality in alternate packaging, while MAX14748ATL+T trades automotive qualification, analog diagnostics, and ultra-low sleep current for simpler I²C integration and lower unit cost in non-automotive settings.

Availability

MCZ33972AEKR2 is available at Aetrix Electronics and suitable for automotive body control modules, seat control units, and steering column switch hubs requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term production continuity.

Supply support for MCZ33972AEKR2 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade mixed-signal ICs.

The MCZ33972AEKR2 belongs to NXP's automotive switch interface product line, designed specifically to replace discrete switch-sensing circuits in vehicle body electronics while meeting stringent ISO 16750 and AEC-Q100 reliability standards.

FAQ

What is the maximum VPWR voltage rating for MCZ33972AEKR2?

The MCZ33972AEKR2 supports a maximum VPWR voltage of 50 V under absolute maximum ratings, but its specified operational range is 5.5–26 V. Transient voltages beyond 40 V (for MCZ33972AEKR2 variant) must be clamped externally to prevent damage, as confirmed in Table 3 of the NXP datasheet Rev. 20.

Does MCZ33972AEKR2 support both 3.3 V and 5.0 V MCU SPI interfaces?

Yes, MCZ33972AEKR2 supports direct interfacing with both 3.3 V and 5.0 V MCUs via its VDD pin, which sets the SPI I/O voltage level. The SO output swings from VDD – 0.8 V (high) to 0.4 V (low), and input thresholds are defined for 0.8–2.2 V logic levels-ensuring interoperability without level shifters.

How many switch inputs does MCZ33972AEKR2 support, and what types?

MCZ33972AEKR2 supports 22 switch inputs: 8 programmable inputs (SP0–SP7) configurable as switch-to-battery or switch-to-ground, and 14 dedicated switch-to-ground inputs (SG0–SG13). All inputs are monitored using an internal 4.0 V reference comparator, with confirmed wetting current options of 16 mA or 2.0 mA.

What is the sleep current consumption of MCZ33972AEKR2?

The MCZ33972AEKR2 achieves a typical sleep-state supply current of 100 µA at VPWR = 10 V and TA = 25 °C, as specified in Table 4 of the NXP datasheet. This value falls within the 40–100 µA range guaranteed across temperature and process variation, enabling compliance with automotive park-mode current budgets.

Can MCZ33972AEKR2 provide analog readings of switch inputs?

Yes, MCZ33972AEKR2 includes a 22:1 analog multiplexer that buffers and routes any selected SP or SG input to the AMUX pin. The AMUX output has a ±10 mV offset voltage and supports 250 µA sink/source, enabling direct connection to an MCU's ADC for diagnostic voltage verification-confirmed in Table 4 and Figure 2 of the datasheet.