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Vishay General Semiconductor - Diodes Division SMC3K33CAHM3/57
- Part No.:
- SMC3K33CAHM3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K33CAHM3/57.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,119
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Product details
Overview
SMC3K33CAHM3/57 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 53.3 V clamping voltage at 56.3 A peak pulse current, and 3000 W peak pulse power capability with a 10/1000 μs waveform - deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMC3K33CAHM3/57 datasheet, SMC3K33CAHM3/57 pinout, SMC3K33CAHM3/57 application, or SMC3K33CAHM3/57 equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with wave-soldering constraints on PCB top-side mounting only.
Technical Context
The SMC3K33CAHM3/57 operates as a silicon avalanche diode-based TVS, leveraging controlled reverse-biased breakdown to clamp transient overvoltages before they damage downstream circuitry. Its low incremental surge resistance and fast response time ensure effective suppression of inductive switching spikes and lightning-induced surges.
Rated for -55 °C to +150 °C junction temperature, it meets UL 497B safety recognition (E136766) and JESD 201 Class 2 whisker resistance. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - distinguishing it from commercial-grade M3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA test current - ensures predictable, tight breakdown threshold across production lots. |
| VC @ IPPM | 53.3 V at 56.3 A - clamping voltage under full 3000 W surge; determines maximum stress imposed on protected device. |
| PPPM | 3000 W (10/1000 μs waveform) - defines energy-handling capacity for transient events like ISO 7637-2 Pulse 1/2a/5a. |
| Polarity | Bidirectional - protects against both positive and negative transients without polarity-sensitive layout constraints. |
| Package | SMC (DO-214AB) - standardized 8.0 mm × 8.0 mm copper pad footprint; supports automated placement and reflow soldering. |
| TJ max | 150 °C - enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
Pinout & Package
SMC3K33CAHM3/57 uses the standard SMC (DO-214AB) surface-mount package: molded epoxy case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability requirements. Bidirectional polarity means no cathode marking on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode) | Surge current entry/exit point | Identical terminal behavior in both directions; connects to protected line and ground reference symmetrically. |
| Cathode (Anode) | Surge current entry/exit point | Functionally identical to Anode due to bidirectional construction; no polarity-dependent routing required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including HTGB, HTRB, and TCT - enabling use in engine control, ADAS, and infotainment modules. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH; eliminates bake preconditioning prior to reflow, reducing manufacturing overhead. |
| UL 497B recognition | E136766 file number confirms compliance with transient protection safety standards for telecom and industrial equipment. |
| Halogen-free & RoHS | HM3 suffix certifies full compliance with environmental directives and JEDEC J-STD-206A material restrictions. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails feeding ECUs and body control modules from load-dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and local regulator input. Use Value: Limits transient voltage to ≤53.3 V during ISO 16750-2 Load Dump tests, preventing regulator latch-up or MOSFET gate oxide failure. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Parallel-connected TVS across signal and return paths to shunt ESD and switching noise. Use Value: Clamps fast-rising transients (<1 ns rise time) to safe levels while maintaining <2.0 μA leakage at 33 V, preserving measurement accuracy. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Inputs |
Use Scenario: Safeguarding Ethernet PHY interfaces and PoE injectors against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage protection ahead of GDT or polymer PTC devices in multi-stage architectures. Use Value: Absorbs up to 3000 W of surge energy per event without degradation, meeting IEC 61000-4-5 Level 4 requirements. |
Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Mounted directly across motor terminals to clamp inductive kickback before reaching driver ICs. Use Value: Withstands repetitive 56.3 A pulses at 10/1000 μs, extending lifetime of half-bridge MOSFETs and reducing thermal stress on gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K33CAHM3_A/57 | Same electrical specs and AEC-Q101 qualification; differs only in underscored suffix notation per updated Vishay naming convention. | No functional difference; identical board-level behavior and qualification scope. | Select when aligning with latest Vishay documentation revision (post-2022) and internal BOM standardization. |
| SMAJ33CA-E3/57 | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range but higher VC (64.5 V at 6.4 A). | Suitable for space-constrained consumer designs where surge energy is lower; not recommended for automotive load-dump scenarios. | Choose only for cost-sensitive, non-automotive applications with verified peak surge ≤400 W and layout area <50 % of SMC footprint. |
Compared with SMC3K33CAHM3/57, SMC3K33CAHM3_A/57 offers identical protection performance with updated nomenclature, while SMAJ33CA-E3/57 trades robustness for size - making the former ideal for AEC-Q101-compliant systems and the latter viable only in low-energy consumer contexts.
Availability
SMC3K33CAHM3/57 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge protection, and consumer appliance motor drive inputs requiring stable component supply and long-term lifecycle support.
Supply support for SMC3K33CAHM3/57 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, optoelectronics, and passive components with emphasis on reliability and application-specific validation.
The SMC3KxxCAHM3 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power transient suppression in harsh-environment applications including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMC3K33CAHM3/57 under maximum surge conditions?
The SMC3K33CAHM3/57 exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 56.3 A using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components experience no more than 53.3 V during worst-case transient events, provided layout inductance is minimized and grounding is optimized.
Is the SMC3K33CAHM3/57 suitable for automotive applications?
Yes, the SMC3K33CAHM3/57 is AEC-Q101 qualified and explicitly intended for automotive use, including engine control units, body electronics, and ADAS subsystems. Its 150 °C maximum junction temperature, MSL Level 1 rating, and UL 497B recognition confirm suitability for under-hood and chassis-mounted deployments where thermal and reliability demands are stringent.
Does the SMC3K33CAHM3/57 have polarity markings on the package?
No, the SMC3K33CAHM3/57 is a bidirectional TVS and carries no polarity marking on the SMC (DO-214AB) case. Both terminals behave identically under positive or negative transients, eliminating orientation concerns during placement and simplifying PCB layout for differential or AC-coupled signal lines.
What does the "HM3" suffix indicate in SMC3K33CAHM3/57?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this variant from commercial-grade "M3" versions and confirms compliance with automotive and industrial environmental and reliability standards beyond basic regulatory requirements.
Can the SMC3K33CAHM3/57 be used in place of older SMC3K33CA-M3/57 parts?
Yes, the SMC3K33CAHM3/57 is a direct replacement for SMC3K33CA-M3/57 in new designs where AEC-Q101 qualification is required. Electrically identical, it shares the same VWM, VBR, VC, and PPPM ratings - but adds automotive-grade reliability validation and enhanced material compliance, making it preferred for mission-critical applications.
SMC3K33CAHM3/57 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K33CAHM3/57 FAQ
1.How can I place an order for SMC3K33CAHM3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K33CAHM3/57 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 SMC3K33CAHM3/57 reliable?
The price and inventory of SMC3K33CAHM3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K33CAHM3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K33CAHM3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K33CAHM3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K33CAHM3/57?
SMC3K33CAHM3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K33CAHM3/57 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 SMC3K33CAHM3/57?
For technical support, including SMC3K33CAHM3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K33CAHM3/57 requirements.
6.How does Aetrix verify that SMC3K33CAHM3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K33CAHM3/57 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 SMC3K33CAHM3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K33CAHM3/57?
All SMC3K33CAHM3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K33CAHM3/57, 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 SMC3K33CAHM3/57 part is unused and in its original packaging.
Return procedure for SMC3K33CAHM3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K33CAHM3/57 Tags
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