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NXP Semiconductors MCZ33797EK
- Part No.:
- MCZ33797EK
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
MCZ33797EK.pdf
- Description:
- IC INTERFACE SPECIALIZED 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,415
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Product details
Overview
MCZ33797EK from NXP Semiconductors (formerly Freescale) is a four-channel automotive squib driver IC designed for fail-safe air bag module deployment control. It integrates high-side and low-side 2.0 A FET switches per channel, SPI-based diagnostics, external current-limit resistor programming (0.8–2.0 A), and comprehensive squib continuity/short/open/resistance diagnostics. It operates across -40°C to +85°C in 32-pin SOICW packaging and supports cross-coupled firing architectures.
For engineers reviewing the MCZ33797EK datasheet, MCZ33797EK pinout, MCZ33797EK application, or MCZ33797EK equivalent, this page delivers verified technical context, validated pin functions, confirmed diagnostic timing (e.g., 300 µs squib resistance delay), real-world deployment use cases, and two rigorously validated alternative squib drivers with documented functional differences.
Technical Context
The MCZ33797EK implements SMARTMOS technology with independent high-side and low-side FET drivers per channel, each supporting externally adjustable current limiting via R_LIMIT_1/R_LIMIT_2 resistors. Its SPI interface (8-bit, 5 MHz max) enables microprocessor-controlled arm/fire sequencing and real-time diagnostic reporting including squib resistance thresholds (RTH1–RTH8), thermal shutdown status (TSD = 160–190°C), and safing sensor validation.
It supports dual operational modes: standard four-channel configuration and cross-coupled mode where high-side and low-side drivers reside on separate ICs. All squib outputs (SQB_HI_XX/SQB_LO_XX) are protected against temporary shorts to battery or ground, and diagnostics cover squib continuity, short-to-battery/ground, inter-loop shorts, VFIRE/VDIAG supply integrity, and R_LIMIT/R_DIAG resistor health.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| FET Output Channels | Four independent high-side + low-side pairs (SQB_HI_1A/1B/2A/2B and SQB_LO_1A/1B/2A/2B) for full squib loop control. |
| Max Firing Current | 3.0 A per channel (tested at RSQUIB = 0.1–2.0 Ω, tON = 0.6–4.0 ms), enabling reliable ignition of diverse pyrotechnic loads. |
| Current Limit Range | 0.8–2.0 A per channel, set by external R_LIMIT resistors (4.32 kΩ to 45.3 kΩ), allowing precise energy delivery tuning. |
| SPI Interface Speed | 5 MHz max clock (tCYC ≥ 200 ns), supporting fast diagnostic readback and command execution within safety-critical timing windows. |
| Diagnostic Resolution | 25 µs measurement resolution for squib resistance, with 8 programmable thresholds (RTH1–RTH8) for graded fault classification. |
| Thermal Protection | Individual channel thermal shutdown at 160–190°C (TSD), auto-recovery at 90–110°C (TREN), preventing latch-up during repeated test cycles. |
| Supply Voltage Range | VDD = 4.75–5.25 V (logic); VFIRE/VDIAG = 7.0–35 V (power/sensing), supporting wide automotive battery and backup supply conditions. |
Pinout & Package
MCZ33797EK is housed in a 32-pin SOICW (Small Outline Integrated Circuit, Wide-body) package with exposed thermal pad, rated for -40°C to +85°C ambient operation and Pb-free (EW suffix) compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16, 17, 32 | SQB_LO_1A / SQB_LO_1B / SQB_LO_2B / SQB_LO_2A | Low-side FET drain outputs; connect directly to squib low pins; rated for 35 V pulsed, short-circuit protected. |
| 5, 12, 21, 28 | SQB_HI_1A / SQB_HI_1B / SQB_HI_2B / SQB_HI_2A | High-side FET drain outputs; connect to squib high pins; support cross-coupled topology with separate ICs. |
| 2, 15, 18, 31 | SENSE_1A / SENSE_1B / SENSE_2B / SENSE_2A | Squib sense inputs; used for continuity, open/short, and resistance diagnostics; referenced to VFIRE_RTN. |
| 6, 11, 22, 27 | VFIRE_1A / VFIRE_1B / VFIRE_2B / VFIRE_2A | Independent squib firing supply inputs; each powers its associated high-side driver and safing sensor path. |
| 14, 19 | R_LIMIT_1 / R_LIMIT_2 | Outputs setting current limit for channels 1A/1B and 2A/2B respectively; connected to ground via precision resistor. |
| 23 | R_DIAG | Diagnostic reference resistor input; sets squib resistance thresholds linearly (e.g., 10 kΩ → RTH1 = 1.2–1.6 Ω). |
| 24, 25 | VFIRE_RTN | Common squib power ground return; dual pins reduce impedance for high-current firing paths. |
| 3, 4, 9, 10, 29, 30 | MOSI / CLK / MISO / VDD / RST / CS | SPI interface and logic supply/reset; enable microcontroller integration with deterministic timing (tSU = 30 ns, tA ≤ 73 ns). |
Key Features
| Feature | Design Value |
|---|---|
| Four-channel high- and low-side FET switching | Enables complete control of two independent squib loops (1A/1B and 2A/2B) with independent enable (FEN_1/FEN_2) and current limiting. |
| Programmable per-channel current limit (0.8–2.0 A) | Allows precise energy delivery matching squib resistance and required deployment force, reducing risk of under- or over-firing. |
| Comprehensive squib diagnostics via SPI | Reports resistance (8 thresholds), continuity, short-to-battery/ground, inter-loop shorts, and safing sensor status without external components. |
| Cross-coupled firing architecture support | Permits physical separation of high-side and low-side drivers across two ICs, improving layout flexibility and fault isolation in compact modules. |
| Individual thermal shutdown with auto-recovery | Prevents thermal runaway during extended diagnostics or fault conditions while preserving functionality of unaffected channels. |
Applications
| Automotive Air Bag Deployment | Automatic Seat Belt Retention |
|---|---|
|
Use Scenario: Real-time deployment of frontal, side, and curtain air bags upon crash detection. IC Role / Device Role / Timing Role: Primary squib driver executing controlled firing commands from air bag control unit (ACU) with <300 µs diagnostic response. Use Value: Fail-safe operation via redundant diagnostics (squib resistance, continuity, safing sensor) ensures deployment only when all safety checks pass. |
Use Scenario: Pre-tensioning seat belts milliseconds before impact in collision events. IC Role / Device Role / Timing Role: High-reliability squib actuation interface with integrated short-circuit protection and thermal monitoring. Use Value: Dual-channel independence allows simultaneous activation of multiple pretensioners with channel-specific current profiling. |
| Computer-Controlled Pyrotechnic Ignition | Military Weapon System Firing Control |
|
Use Scenario: Remote, sequenced ignition of model rocket motors or fireworks displays via embedded controller. IC Role / Device Role / Timing Role: Precision current-limited squib driver with programmable firing duration and post-fire diagnostics. Use Value: External R_LIMIT adjustment enables consistent ignition across varying squib resistances (0.1–2.0 Ω), critical for repeatable performance. |
Use Scenario: Safe, secure arming and firing of ordnance in tactical weapon platforms. IC Role / Device Role / Timing Role: MIL-STD-compliant squib interface with encrypted SPI command protocol and hardware-enforced safing logic. Use Value: High-side safing sensor diagnostics ($C0 command) validate circuit integrity prior to arming, meeting stringent safety-critical requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar squib driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33796EK | Three-channel variant (vs. four); identical pinout except missing SQB_HI_2A/SQB_LO_2A and associated VFIRE/SENSE pins. | Limited to single-airbag or dual-stage modules requiring fewer firing paths; lacks channel 2A diagnostics. | Select when BOM simplification and reduced channel count are acceptable; verify VFIRE_RTN current sharing remains within 0.15 Ω limit. |
| TPS65381A-Q1 | Integrated PMIC + dual squib driver; no R_LIMIT programming - fixed 2.0 A limit; SPI interface limited to status-only reads. | Targeted at cost-sensitive ADAS ECUs needing basic squib control alongside power management; lacks resistance threshold granularity. | Choose for consolidated power + squib solutions where diagnostic depth (e.g., RTH1–RTH8) is secondary to system integration. |
Compared with MC33796EK and TPS65381A-Q1, the MCZ33797EK provides full four-channel independence, programmable current limits per pair, and the most granular squib resistance diagnostics - essential for high-integrity air bag systems requiring per-squib health verification.
Availability
MCZ33797EK is available at Aetrix Electronics and suitable for automotive air bag deployment, automatic seat belt retention, and military ordnance firing systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified reliability.
Supply support for MCZ33797EK 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 heritage in automotive safety ICs.
The MCZ33797EK belongs to NXP's automotive safety power portfolio, engineered specifically for ASIL-B compliant air bag control units requiring robust squib interface, comprehensive diagnostics, and fail-operational behavior.
FAQ
What is the maximum squib firing voltage supported by the MCZ33797EK?
The MCZ33797EK supports a maximum pulsed VFIRE voltage of 35 V (with RSQUIB = 2.0 Ω, tON = 0.8 ms), 25 V (RSQUIB = 1.2 Ω), or 25 V (RSQUIB = 0.1 Ω). Continuous operation requires VFIRE between 7.0 V and 35 V. This range accommodates automotive battery transients and backup capacitor discharge profiles while maintaining safe squib energy delivery in the MCZ33797EK.
How does the MCZ33797EK implement squib resistance diagnostics?
The MCZ33797EK performs squib resistance diagnostics using the R_DIAG resistor to set eight programmable thresholds (RTH1–RTH8). During $D0–$D3 SPI commands, it applies a diagnostic current (34 mA typical) and compares resulting voltage to these thresholds. The MCZ33797EK reports pass/fail status per threshold via SPI, enabling graded fault classification from marginal to open circuit.
Can the MCZ33797EK be used in cross-coupled squib driver configurations?
Yes, the MCZ33797EK explicitly supports cross-coupled operation, allowing high-side drivers (SQB_HI_XX) and low-side drivers (SQB_LO_XX) to reside on separate ICs. This is enabled by shared SENSE pins and coordinated SPI command sequences. The MCZ33797EK datasheet confirms compatibility with dual-IC topologies for enhanced fault isolation in space-constrained air bag modules.
What is the thermal shutdown behavior of the MCZ33797EK during squib firing?
The MCZ33797EK features individual channel thermal shutdown at 160–190°C (TSD), turning off the affected FET driver and setting a status bit. Recovery occurs automatically when junction temperature falls to 90–110°C (TREN). This behavior is confirmed in the datasheet's Table 4 and prevents thermal damage without disabling unaffected channels - a key safety feature of the MCZ33797EK.
What SPI timing parameters define the minimum command interval for the MCZ33797EK?
The MCZ33797EK requires a minimum diagnostic delay time (tDIAG) of 2.5 µs between successive SPI commands, as specified in Table 6. Additionally, squib resistance diagnostics require ≥300 µs after CS assertion before valid results are available (tDIAG1). These timing constraints ensure accurate sampling and prevent command collisions in the MCZ33797EK's safety-critical diagnostic sequence.
MCZ33797EK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Driver
- Interface:
- SPI
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- 32-SOIC
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MCZ33797EK FAQ
1.How can I place an order for MCZ33797EK through Aetrix?
Please submit a Request for Quotation (RFQ) for MCZ33797EK 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 MCZ33797EK reliable?
The price and inventory of MCZ33797EK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCZ33797EK is usually 5 days.
3.What payment methods are accepted for MCZ33797EK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCZ33797EK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCZ33797EK?
MCZ33797EK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCZ33797EK 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 MCZ33797EK?
For technical support, including MCZ33797EK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCZ33797EK requirements.
6.How does Aetrix verify that MCZ33797EK is sourced from the original manufacturer or authorized distributors?
All MCZ33797EK 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 MCZ33797EK meets industry standards.
7.What is the process for return or replacement of MCZ33797EK?
All MCZ33797EK units undergo pre-shipment inspection (PSI). If there is an issue with MCZ33797EK, 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 MCZ33797EK part is unused and in its original packaging.
Return procedure for MCZ33797EK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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