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HomeProductsIntegrated Circuits (ICs)Interface - SpecializedMC33972TEW
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MC33972TEW - NXP USA Inc.

Manufacturer Part Number
MC33972TEW
Manufacturer
NXP Semiconductors
Allelco Part Number
32D-MC33972TEW
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,083 pcs available, New & Original
Parts Description
IC INTERFACE SPECIALIZED 32SOIC
Package
32-SOIC
Data sheet
MC33972TEW.pdf

Datasheets

MC33972(A, T).pdf
RoHs Status
ROHS3 Compliant
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In stock: 7083

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Specifications

MC33972TEW Tech Specifications
NXP USA Inc. - MC33972TEW technical specifications, attributes, parameters and parts with similar specifications to NXP USA Inc. - MC33972TEW

Product Attribute Attribute Value
Manufacturer NXP Semiconductors
Voltage - Supply 3.1V ~ 5.25V
Supplier Device Package 32-SOIC
Series -
Package / Case 32-BSSOP (0.295", 7.50mm Width)
Product Attribute Attribute Value
Package Tube
Mounting Type Surface Mount
Interface SPI Serial
Base Product Number MC339
Applications Switch Monitoring

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

MC33972TEW Image
MC33972TEW (1)

Manufacturer Part Number

MC33972TEW

Manufacturer

NXP Semiconductors

Introduction

Multiplexed switch detection interface designed for automotive and industrial applications.

Product Features and Performance

Provides robust switch detection for up to 22 switches

Supports SPI serial interface for communication

Offers wetting current for switch contacts

Incorporates internal diagnostics for fault detection

Wide operating voltage range suitable for various environments

Product Advantages

Reduces wiring complexity and weight in automotive applications

Enhanced system reliability due to built-in diagnostics

Adaptable to a variety of switch types

High immunity to electromagnetic interference (EMI)

Key Technical Parameters

Voltage Supply: 3.1V to 5.25V

Interface: SPI Serial

Packaging: 32-BSSOP Tube

Mounting Type: Surface Mount

Quality and Safety Features

Undergoes rigorous testing for automotive standards

Features protection against overvoltage conditions

Includes thermal shutdown and open load detection mechanisms

Compatibility

Compatible with various microcontrollers with SPI capability

Able to interface with a range of switch types

Application Areas

Automotive switch monitoring systems

Industrial control systems

Heavy machinery switch interfaces

Product Lifecycle

Product Status: Active

No known discontinuation, with ongoing support and availability

Several Key Reasons to Choose This Product

Enables greater design flexibility in complex systems

Reduces overall material costs by minimizing wire harnesses

Streamlines system diagnostics with integrated features

Reliable operation in harsh automotive environments

Simplifies PCB layout with SOIC package compatibility

Frequently Asked Questions(FAQ)

How does the MC33972TEW handle fault detection in switch monitoring applications when input signals are unstable due to mechanical bounce or EMI?
The MC33972TEW incorporates programmable debounce filters and noise immunity features designed to distinguish between legitimate switch transitions and transient glitches. By allowing engineers to configure timing thresholds for signal validation, it reduces false fault reporting during noisy conditions. This capability ensures reliable state detection in automotive or industrial environments where contact bounce and electromagnetic interference are common.
What is the maximum allowable supply voltage for the MC33972TEW, and how should designers account for voltage transients in automotive systems?
The MC33972TEW operates over a supply range of 3.1V to 5.25V. In automotive applications, where load dump events can momentarily exceed this range, designers must ensure proper protection circuitry—such as TVS diodes—are implemented at the VCC pin to prevent damage. The device’s internal clamping diodes provide limited protection, but external components are recommended for robust system-level resilience.
Can the MC33972TEW interface directly with microcontrollers that use 3.3V logic levels without level shifting?
Yes, the MC33972TEW’s digital I/O pins are compatible with 3.3V logic when powered from a 3.3V supply. Since the SPI interface operates within the same voltage domain as the MCU, no external level translation is required. However, if the MC33972TEW is powered from 5V while interfacing with a 3.3V microcontroller, bidirectional level shifters may be needed to protect the MCU inputs.
How many individual switch channels can the MC33972TEW monitor, and what limits channel density in compact PCB designs?
The MC33972TEW supports up to 16 independent switch inputs, each with dedicated fault detection and status reporting. In space-constrained layouts, routing complexity and crosstalk become limiting factors. Designers must maintain adequate spacing between input traces and avoid parallel runs near high-speed lines to preserve signal integrity.
How does the MC33972TEW compare to the MC33973TEW in terms of input configuration and diagnostic capabilities?
While both devices share the same package and core architecture, the MC33973TEW offers enhanced diagnostics with open-load detection and configurable pull-up/pull-down modes per channel. The MC33972TEW provides basic switch monitoring with fixed internal pull-ups and simpler fault signaling. Selection depends on whether advanced input characterization is required beyond simple on/off state verification.
What happens to the SPI communication during a power-up sequence where the MC33972TEW is not yet fully stabilized?
During power-up, the MC33972TEW enters a reset state until its supply voltage reaches the valid operating range (above 3.1V). Until then, the SPI interface remains inactive and unresponsive. Designers should ensure the host microcontroller waits for a stable power rail before initiating SPI transactions to avoid undefined behavior or bus contention.
Is it possible to cascade multiple MC33972TEW devices on the same SPI bus for expanded monitoring capacity?
Yes, multiple MC33972TEW devices can coexist on a single SPI bus using separate chip select lines. Each device responds only when its individual CS pin is asserted low. Care must be taken to manage propagation delays and ensure consistent clock timing across all units, especially at higher SPI frequencies.
How does temperature variation affect the accuracy of fault detection thresholds in the MC33972TEW?
The MC33972TEW’s internal comparators and reference circuits exhibit minimal drift over the specified temperature range (-40°C to +125°C). However, external components such as sense resistors or voltage dividers used in fault threshold settings may introduce variability. Designers should simulate worst-case thermal conditions when setting margin-based thresholds for safety-critical applications.
What are the key differences between using internal versus external pull-up resistors with the MC33972TEW switch inputs?
The MC33972TEW includes integrated weak pull-up resistors on each input, sufficient for most resistive-switch configurations. Using external pull-ups allows customization of resistance values for noise immunity or current consumption optimization. External resistors also enable compatibility with active-high or active-low topologies not supported by internal defaults.
How should grounding be handled when integrating the MC33972TEW into a mixed-signal PCB layout?
A solid ground plane beneath the MC33972TEW is essential to minimize noise coupling into analog and digital sections. Input traces should be kept short and routed away from high-current paths or switching regulators. Separating analog and digital grounds with a single connection point near the IC improves stability and reduces susceptibility to ground bounce.
Can the MC33972TEW detect stuck-at faults such as permanently closed or open switches?
The device monitors input states and reports deviations from expected patterns via status registers. When combined with application-layer logic that tracks state changes over time, it can infer stuck-at conditions. However, real-time hardware detection requires additional features found in derivative models; the base MC33972TEW relies on software interpretation for fault classification.
What impact does increasing the SPI clock frequency have on the MC33972TEW’s ability to respond to rapid switch transitions?
Higher SPI frequencies reduce latency in reading fault status data but do not increase the rate at which the MC33972TEW samples inputs—this is determined by its internal polling mechanism. If switch activity occurs faster than the read interval, missed events may occur regardless of clock speed. Balancing throughput and responsiveness requires understanding both the sampling period and communication overhead.

Parts with Similar Specifications

The three parts on the right have similar specifications to NXP USA Inc. MC33972TEW

Product Attribute MC33972ATEWR2 MC33972TEW,574 MC33972ATEW MC33972TEWR2
Part Number MC33972ATEWR2 MC33972TEW,574 MC33972ATEW MC33972TEWR2
Manufacturer NXP USA Inc. NXP USA Inc. NXP USA Inc. NXP USA Inc.
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Interface - - - -
Voltage - Supply - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Applications - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

MC33972TEW Datasheet PDF

Download MC33972TEW pdf datasheets and NXP USA Inc. documentation for MC33972TEW - NXP USA Inc..

Datasheets
MC33972(A, T).pdf
PCN Packaging
All Dev Label Update 15/Dec/2020.pdf Mult Dev Pkg Seal 15/Dec/2020.pdf
PCN Assembly/Origin
MC14xx/MC33x/MC34x/MCZ33x/MPC17x 15/Jul/2022.pdf
Environmental Information
NXP USA Inc REACH.pdf NXP USA Inc RoHS Cert.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
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Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
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Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
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  • Fast Sourcing & Delivery
Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
MC33972TEW Image

MC33972TEW

NXP USA Inc.
32D-MC33972TEW

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