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Vishay General Semiconductor - Diodes Division SMC3K75CAHM3_A/I
- Part No.:
- SMC3K75CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K75CAHM3_A/I.pdf
- Description:
- 3KW, 75V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,735
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Product details
Overview
SMC3K75CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive-grade overvoltage protection with 75 V standoff voltage, 83.3–92.1 V breakdown range, and 3000 W peak pulse power (10/1000 μs). It clamps transients to 121 V at 24.8 A and meets ISO 7637-2 and ISO 16750-2 for automotive load dump and switching surge suppression.
For engineers reviewing the SMC3K75CAHM3_A datasheet, SMC3K75CAHM3_A pinout, SMC3K75CAHM3_A application, or SMC3K75CAHM3_A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 175 °C junction temperature rating, UL 497B safety recognition, and compliance with IEC 61000-4-2 ESD (30 kV contact/air).
Technical Context
This TVS diode operates as a voltage-clamping protection device across sensitive signal or power lines, responding within nanoseconds to transient overvoltages induced by inductive switching, load dump, or ESD events. Its bidirectional architecture enables symmetrical clamping on both polarities without polarity marking.
It delivers 30 kW peak pulse power under 8/20 μs waveform, exhibits low incremental surge resistance, and maintains stable performance across -55 °C to +175 °C operating junction temperature. Thermal resistance is 4.0 °C/W junction-to-mount and 90 °C/W junction-to-ambient per JEDEC 51-14 and 51-2A standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 75 V - Maximum continuous reverse operating voltage before clamping initiates. |
| Breakdown Voltage (VBR) | 83.3–92.1 V at 1 mA - Confirmed voltage range where device transitions into avalanche conduction. |
| Clamping Voltage (VC) | 121 V at 24.8 A (10/1000 μs) - Peak voltage seen by protected circuit during rated surge current. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - Sustained transient energy handling capacity without failure. |
| Junction Temperature Range | -55 °C to +175 °C - Enables operation in under-hood automotive environments and industrial enclosures. |
| ESD Rating | 30 kV per IEC 61000-4-2 (contact & air) - Robust immunity against human-body-model electrostatic discharge. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress-test requirements including HTRB, HTGB, and TCT. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Molding compound meets UL 94 V-0. Polarity not marked due to bidirectional function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Anode-side terminal (non-marked end) | One of two symmetrical terminals; no functional distinction-device conducts identically in either direction. |
| Anode (A) | Cathode-side terminal (non-marked end) | Second symmetrical terminal; bidirectional operation eliminates need for orientation-specific layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 3000 W peak pulse power (10/1000 μs) | Supports high-energy automotive transients such as ISO 7637-2 Pulse 1 (−150 V, 2 ms) and Pulse 2a (112 V, 50 μs). |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules requiring long-term field stability. |
| UL 497B recognition (E136766) | Confirms safety compliance for telecom and industrial interface protection circuits requiring certified surge devices. |
| MSL Level 1 (260 °C peak reflow) | Permits standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump surges per ISO 16750-2 Pulse b (up to 120 V, 400 ms). IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between power rail and ground to limit transient excursions below IC absolute maximum ratings. Use Value: Clamps to 121 V at 24.8 A, preventing damage to downstream DC/DC controllers and microcontrollers during alternator load dump events. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal lines interfacing with microcontroller ADC inputs. Use Value: 30 kV IEC 61000-4-2 ESD immunity ensures uninterrupted data acquisition during maintenance or cable handling in harsh environments. |
| Telecom Data Line Surge Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding Ethernet PHY interfaces or RS-485 transceivers against lightning-induced surges per IEC 61000-4-5 (8/20 μs). IC Role / Device Role / Timing Role: Primary-level TVS on line-side of isolation barrier, absorbing up to 30 kW surge energy before secondary-side components are stressed. Use Value: 157 V clamping voltage at 191 A (8/20 μs) limits stress on coupled transformers and common-mode chokes in PoE and base station front-ends. |
Use Scenario: Input-stage transient suppression in wall-mounted AC/DC adapters for smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Secondary-side DC bus protector after rectification and bulk capacitance, guarding against mains-borne transients and capacitor discharge spikes. Use Value: 175 °C max junction temperature allows reliable operation in thermally constrained plastic enclosures without derating at ambient up to 85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA | Same 75 V VWM, but lower PPPM (400 W), smaller SMA package, higher RthJA (150 °C/W). | Not AEC-Q101 qualified; limited to consumer/industrial non-automotive use. | Select when cost and board space are critical and automotive qualification is unnecessary. |
| SMCJ75CA | Identical SMC package and AEC-Q101 qualification, but 1500 W PPPM (half the rating of SMC3K75CAHM3_A). | Insufficient for ISO 16750-2 Pulse b or ISO 7637-2 Pulse 1 in high-energy automotive systems. | Choose only if system-level testing confirms 1500 W is sufficient and thermal margin permits. |
Compared with SMAJ75CA and SMCJ75CA, the SMC3K75CAHM3_A delivers double the pulse power of SMCJ75CA and 7.5× that of SMAJ75CA while maintaining AEC-Q101 compliance and industry-leading thermal resistance-making it the preferred choice for demanding automotive and industrial surge protection where robustness and longevity are mandatory.
Availability
SMC3K75CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, telecom surge suppression, and consumer power adapter development requiring stable component supply and long-term lifecycle support.
Supply support for SMC3K75CAHM3_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, efficiency, and application-specific validation.
The SMC3KxxCAHM3_A series belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for automotive and industrial applications demanding AEC-Q101 qualification, high surge robustness, and extended temperature operation.
FAQ
What is the clamping voltage of SMC3K75CAHM3_A at its rated peak pulse current?
The SMC3K75CAHM3_A clamps to 121 V at 24.8 A under the standard 10/1000 μs waveform. This value is measured and guaranteed per the Vishay datasheet (Document Number 98241, Rev. 09-Jan-2024) and defines the maximum voltage imposed on protected circuitry during a 3000 W transient event. The clamping voltage remains stable across its full operating temperature range.
Is SMC3K75CAHM3_A suitable for automotive applications?
Yes, the SMC3K75CAHM3_A is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 (Pulse 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) for automotive electrical disturbances. Its 175 °C max junction temperature, MSL Level 1 rating, and halogen-free construction make it appropriate for under-hood and body-control module designs where SMC3K75CAHM3_A is deployed as primary surge protection.
Does SMC3K75CAHM3_A have polarity markings on the package?
No, the SMC3K75CAHM3_A is a bidirectional TVS diode and carries no polarity marking on the SMC (DO-214AB) package. Both terminals are functionally identical, enabling flexible PCB layout without orientation constraints. This symmetry simplifies routing on differential lines and unidirectional power rails alike, and is confirmed in the Vishay mechanical drawings and device description.
What is the maximum peak pulse current SMC3K75CAHM3_A can handle under an 8/20 μs waveform?
The SMC3K75CAHM3_A supports a peak pulse current of 191 A under the 8/20 μs waveform, corresponding to its 30 kW surge rating. This value is specified in the Electrical Characteristics table of the official datasheet and reflects the device's capability to absorb high-energy lightning-surge transients common in telecom and industrial infrastructure where SMC3K75CAHM3_A serves as front-end protection.
How does the thermal performance of SMC3K75CAHM3_A compare to standard SMC-package TVS diodes?
The SMC3K75CAHM3_A features a junction-to-mount thermal resistance (RthJM) of 4.0 °C/W, significantly lower than typical SMC TVS diodes (~6–8 °C/W), due to optimized die attach and package construction. This enables higher sustained surge duty cycles and improved reliability in thermally constrained layouts-critical when deploying SMC3K75CAHM3_A in densely packed automotive control units or sealed industrial enclosures.
SMC3K75CAHM3_A/I 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 24.8A
- 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)
SMC3K75CAHM3_A/I FAQ
1.How can I place an order for SMC3K75CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K75CAHM3_A/I 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 SMC3K75CAHM3_A/I reliable?
The price and inventory of SMC3K75CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K75CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMC3K75CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K75CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K75CAHM3_A/I?
SMC3K75CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K75CAHM3_A/I 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 SMC3K75CAHM3_A/I?
For technical support, including SMC3K75CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K75CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K75CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K75CAHM3_A/I 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 SMC3K75CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K75CAHM3_A/I?
All SMC3K75CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K75CAHM3_A/I, 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 SMC3K75CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMC3K75CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K75CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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