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Vishay General Semiconductor - Diodes Division SMC3K33CAHM3_A/H
- Part No.:
- SMC3K33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K33CAHM3_A/H.pdf
- Description:
- 3KW, 33V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
SMC3K33CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) designed for robust overvoltage protection in automotive and industrial power lines. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 53.3 V under 430 A surge current, and features a 33 V standoff voltage with 36.7–40.6 V breakdown range. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/3a/3b and ISO 16750-2 Pulse b standards for 12 V battery systems.
For engineers reviewing the SMC3K33CAHM3_A datasheet, SMC3K33CAHM3_A pinout, SMC3K33CAHM3_A application, or SMC3K33CAHM3_A equivalent, this device is selected for high-energy transient suppression on DC power rails where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical - especially in automotive ECUs, ADAS sensor power inputs, and industrial motor drive control boards.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, activating when reverse voltage exceeds its breakdown threshold (36.7–40.6 V). Its bidirectional architecture enables symmetric clamping for both positive and negative transients without polarity marking.
It sustains 3000 W peak pulse power per 10/1000 μs waveform and handles up to 430 A peak pulse current (10/1000 μs), with clamping voltage tightly specified at 53.3 V - enabling precise coordination with downstream IC overvoltage limits. Thermal resistance is 90 °C/W (junction-to-ambient) and 4.0 °C/W (junction-to-mount), supporting reliable operation up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 33 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 36 V nominal systems. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - guaranteed activation threshold range; ensures consistent turn-on across temperature and unit variation. |
| Clamping Voltage (VC) | 53.3 V at 430 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; enables design margin below 55 V IC absolute max ratings. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - energy-handling capacity for standardized load dump and switching transients; validated per IEC 61000-4-5. |
| ESD Withstand | ±30 kV (IEC 61000-4-2 HBM contact/air) - protects against human-body model ESD events without degradation. |
| Junction Temperature Range | −55 °C to +175 °C - supports under-hood automotive placement and industrial high-temp environments without derating. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated assembly and JEDEC-compliant reflow. |
Pinout & Package
SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, halogen-free, RoHS-compliant, and AEC-Q101 qualified. Bidirectional construction means no polarity marking; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Transient current sink (bidirectional) | Both terminals function identically; no cathode/anode distinction - either terminal conducts during positive or negative overvoltage events. |
| Anode (A) | Transient current sink (bidirectional) | Identical to Cathode terminal; symmetry enables flexible PCB layout with no orientation constraint. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without polarity concerns - reduces BOM count and layout complexity. |
| 30 kW surge rating (8/20 μs) | Supports high-energy lightning-induced surges per IEC 61000-4-5; clamps at 69.8 V @ 430 A, preserving system integrity during severe grid or line disturbances. |
| AEC-Q101 qualification | Validated for automotive under-hood use including thermal cycling, humidity, and mechanical shock - eliminates need for additional qualification testing. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking; simplifies manufacturing and avoids moisture-related popcorning. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 3b), improving protection fidelity for sensitive microcontrollers and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECU power input against load dump (ISO 16750-2 Pulse b) and inductive switching spikes (ISO 7637-2 Pulse 1/2a). IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at power entry point, clamping within nanoseconds to limit voltage seen by downstream DC/DC converters and MCU LDOs. Use Value: Clamps to 43 V (Pulse 1) and 45 V (Pulse 3b) - well below 48 V absolute maximum ratings of common automotive PMICs and microcontrollers. |
Use Scenario: Safeguarding gate driver supply rails in 3-phase inverter modules exposed to back-EMF and cross-conduction transients. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 100–500 ns switching spikes generated by IGBT/MOSFET commutation. Use Value: 3000 W 10/1000 μs rating and 175 °C max junction temperature ensure sustained reliability in thermally demanding motor control enclosures. |
| Telecom Power Interface | Automotive Sensor Module Input |
Use Scenario: Shielding 48 V PoE-powered base station RF front-end supplies from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line defense on primary DC input, coordinated with upstream GDT and downstream π-filter to meet IEC 61000-4-5 Level 4. Use Value: 69.8 V clamping at 430 A (8/20 μs) provides predictable let-through voltage for secondary protection stages and maintains <100 V stress on DC/DC isolators. |
Use Scenario: Securing LIN/CAN bus power pins and analog sensor supply lines (e.g., pressure, temperature) in ADAS camera modules. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to connector, suppressing ESD and cable discharge events before reaching signal conditioning ASICs. Use Value: ±30 kV HBM ESD rating and 53.3 V clamping enable direct interface with 3.3 V/5 V sensor ICs without additional series impedance or filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower PPPM (400 W), SMA package (smaller footprint, higher RthJA = 110 °C/W), same 33 V VWM but higher VC = 53.3 V @ 7.5 A. | Suitable for lower-energy consumer electronics; insufficient for automotive load dump or ISO 7637-2 Pulse 1. | Select SMC3K33CAHM3_A when >1 kW surge handling, AEC-Q101 compliance, or 175 °C operation is required. |
| SMCJ33CA | Same SMC package and 3000 W rating, but non-AEC-Q101, no MSL Level 1 rating, and higher typical clamping voltage (54.0 V @ 430 A). | Acceptable for industrial/commercial use where automotive qualification is not mandated. | Choose SMC3K33CAHM3_A for automotive OEM programs requiring full AEC-Q101 traceability and extended temperature validation. |
Compared with SMAJ33CA and SMCJ33CA, the SMC3K33CAHM3_A offers verified AEC-Q101 qualification, tighter clamping consistency, and guaranteed MSL Level 1 process compatibility - making it the only option among the three qualified for safety-critical automotive power rail protection without design revalidation.
Availability
SMC3K33CAHM3_A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drives, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SMC3K33CAHM3_A 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, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-power handling.
The SMC3KxxCAHM3_A series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh automotive and industrial environments where AEC-Q101 compliance and 175 °C operation are mandatory.
FAQ
What is the maximum clamping voltage of the SMC3K33CAHM3_A under a 10/1000 μs surge?
The SMC3K33CAHM3_A clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 430 A with a 10/1000 μs waveform. This value is guaranteed across temperature and unit variation per Vishay Document 98241, ensuring predictable protection for downstream 5 V or 3.3 V logic circuits powered from a 33 V rail. The SMC3K33CAHM3_A achieves this with low incremental surge resistance and fast sub-nanosecond response.
Is the SMC3K33CAHM3_A suitable for automotive under-hood applications?
Yes, the SMC3K33CAHM3_A is AEC-Q101 qualified and rated for −55 °C to +175 °C junction temperature, making it fully suitable for under-hood automotive applications such as engine control modules, transmission controllers, and ADAS domain controllers. Its MSL Level 1 rating and halogen-free, RoHS-compliant construction further align with automotive manufacturing and environmental requirements. The SMC3K33CAHM3_A has been validated per ISO 7637-2 and ISO 16750-2 test pulses.
How does the SMC3K33CAHM3_A differ from standard SMCJ33CA TVS diodes?
The SMC3K33CAHM3_A differs from SMCJ33CA in three key ways: it carries full AEC-Q101 qualification, is rated for MSL Level 1 reflow (260 °C peak), and features tighter parametric control - including lower typical clamping voltage (53.3 V vs. 54.0 V at 430 A) and guaranteed 175 °C operation. The SMC3K33CAHM3_A also uses HM3_A suffix indicating halogen-free, RoHS-compliant, and whisker-tested construction. These distinctions make the SMC3K33CAHM3_A appropriate for automotive OEM designs where SMCJ33CA would require additional validation.
What is the standoff voltage and breakdown range for the SMC3K33CAHM3_A?
The SMC3K33CAHM3_A has a standoff voltage (VWM) of 33 V - the maximum DC or RMS voltage it can withstand continuously without significant leakage. Its breakdown voltage (VBR) is specified from 36.7 V to 40.6 V at 1 mA test current, representing the guaranteed voltage range at which the device transitions into avalanche conduction. This 3.9 V window ensures reliable turn-on while accommodating process variation and temperature drift. All values are confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 98241).
Can the SMC3K33CAHM3_A be used in bidirectional signal line protection?
No - although the SMC3K33CAHM3_A is bidirectional and symmetrical, its 33 V standoff voltage and 53.3 V clamping level make it unsuitable for protecting low-voltage signal lines (e.g., CAN, LIN, USB, or I²C), which typically operate below 5 V. It is engineered for DC power rail protection (12 V, 24 V, 36 V systems) where high-energy transients occur. For signal line protection, lower-voltage TVS devices such as SMBJ5.0CA or ESD5V3U1U are appropriate. The SMC3K33CAHM3_A must be applied only on power domains matching its VWM and clamping profile.
SMC3K33CAHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC3K33CAHM3_A/H FAQ
1.How can I place an order for SMC3K33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K33CAHM3_A/H 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_A/H reliable?
The price and inventory of SMC3K33CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K33CAHM3_A/H?
SMC3K33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K33CAHM3_A/H 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_A/H?
For technical support, including SMC3K33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K33CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K33CAHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K33CAHM3_A/H?
All SMC3K33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K33CAHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMC3K33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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