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Vishay General Semiconductor - Diodes Division SMC3K75CAHM3_A/H
- Part No.:
- SMC3K75CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K75CAHM3_A/H.pdf
- Description:
- 3KW, 75V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,686
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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 and industrial electronics protection. It features 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR), 121 V clamping voltage at 24.8 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed to safeguard MOSFETs and sensor signal lines against ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K75CAHM3_A datasheet, SMC3K75CAHM3_A pinout, SMC3K75CAHM3_A application, or SMC3K75CAHM3_A equivalent, this page delivers verified electrical parameters, clamping behavior under standardized surge waveforms, thermal resistance values (RthJA = 90 °C/W), ESD immunity (30 kV HBM), and real-world load-dump performance per ISO 16750-2 Pulse B in 12 V battery systems.
Technical Context
This TVS diode operates bidirectionally with symmetrical clamping on both polarities, enabling robust protection of differential or AC-coupled signal paths without polarity concerns. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients like ISO 7637-2 Pulse 3b (150 ns rise time), while meeting MSL Level 1 reflow compatibility up to 260 °C peak.
The device achieves 30 kW surge capability under 8/20 μs waveform (157 V @ 191 A), supporting high-energy load dump events in automotive ECUs. Junction temperature range spans –55 °C to +175 °C, and thermal impedance RthJM is 4.0 °C/W - critical for sustained transient handling in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V/24 V automotive bus interfaces. |
| VBR (min/max) | 83.3 V / 92.1 V at 1.0 mA - tight breakdown tolerance ensures predictable turn-on across temperature and unit-to-unit variation. |
| VC @ IPPM (10/1000 μs) | 121 V at 24.8 A - clamping voltage directly limits stress on downstream ICs during common ISO 7637-2 transients. |
| PPPM | 3000 W - peak pulse power rating for 10/1000 μs waveform; determines survivability against repetitive switching surges in motor drivers. |
| ESD Rating | 30 kV contact & air discharge (IEC 61000-4-2) - eliminates need for additional ESD protection on exposed connectors or sensors. |
| TJ max. | +175 °C - enables operation in under-hood automotive environments and high-power industrial enclosures without derating. |
| RthJA | 90 °C/W - thermal resistance junction-to-ambient on standard FR4 PCB; informs heatsinking requirements for multi-pulse duty cycles. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, J-STD-002 solderable. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient current sink (bidirectional conduction) | Functions as common terminal for both polarities; connects to protected line (e.g., CAN_H or LIN bus) with no directional dependency. |
| Anode | Transient current return path | Connected to ground plane or low-impedance chassis reference; completes clamping loop during positive and negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, LIN), and ungrounded sensor outputs without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for ECU, ADAS, and body control modules. |
| UL 497B recognition (E136766) | Confirms safety compliance for telecom and industrial interface protection, reducing certification burden in end-equipment approvals. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake-out steps and streamlining SMT manufacturing. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic interfacing with 12 V supply domains. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V power rails feeding engine control units (ECUs) and body controllers against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary transient suppressor placed at power entry point, clamping ISO 16750-2 Pulse B (up to 125 V) within 1 ns response time. Use Value: Limits rail voltage to ≤121 V during 100 ms pulses, preventing MOSFET gate oxide failure and microcontroller brownout resets. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs from EFT and surge coupling. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) shunt protector on 4–20 mA or 0–10 V signal paths. Use Value: Maintains signal integrity below 1% error during 4 kV EFT bursts (IEC 61000-4-4) due to sub-1 ns response and stable VBR over temperature. |
| Automotive CAN Bus Interface | Telecom Line Card Surge Protection |
Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in vehicle infotainment gateways subjected to ISO 7637-2 Pulse 2a (112 V, 50 μs). IC Role / Device Role / Timing Role: Paired SMC3K75CAHM3_A devices (one per line) referenced to chassis ground, clamping common-mode transients. Use Value: Ensures CAN bit timing remains intact by limiting differential voltage excursion to <2×121 V, preserving physical layer compliance. |
Use Scenario: Front-end surge suppression on Ethernet or RS-485 ports of telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage protector absorbing 8/20 μs surges up to 191 A (157 V clamp), coordinated with GDT or MOV secondary stages. Use Value: Survives repeated 30 kA (8/20 μs) events per IEC 61000-4-5 Level 4, extending system uptime and reducing field failure rates. |
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 VWM (75 V) and bidirectional configuration, but lower PPPM (400 W) and higher VC (125 V @ 17.3 A); SMA package (smaller footprint, higher RthJA = 130 °C/W). | Limited to low-energy transients (e.g., ESD-only); unsuitable for ISO 7637-2 Pulse 1 or load dump. | Select when board space is constrained and surge energy is <50 mJ; verify thermal margin under multi-pulse conditions. |
| 1.5KE75CA | Higher PPPM (1500 W), same VWM, but axial-leaded DO-201 package; not surface-mountable and lacks AEC-Q101 qualification. | Restricted to non-automotive, non-SMT designs; incompatible with automated assembly and high-vibration environments. | Choose only for legacy through-hole prototyping or repair; avoid for new automotive or industrial production designs. |
Compared with SMAJ75CA and 1.5KE75CA, SMC3K75CAHM3_A uniquely combines 3000 W surge capacity, AEC-Q101 qualification, SMC surface-mount packaging, and UL 497B recognition - making it the only option validated for high-reliability automotive power rail and CAN bus protection in volume production.
Availability
SMC3K75CAHM3_A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom line cards, and CAN/LIN bus nodes requiring stable component supply across extended product lifecycles.
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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMC3KxxCAHM3_A series was engineered specifically for automotive-grade transient suppression - delivering high-energy clamping, AEC-Q101 validation, and robust thermal performance in compact SMC packages for next-generation vehicle electronics.
FAQ
What is the clamping voltage of SMC3K75CAHM3_A under a 10/1000 μs surge?
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 Vishay's datasheet (Document Number 98241, Rev. 09-Jan-2024), and represents the maximum voltage seen by protected circuitry during that transient event. The SMC3K75CAHM3_A maintains this clamping performance across its full operating temperature range (–55 °C to +175 °C).
Is SMC3K75CAHM3_A qualified for automotive applications?
Yes, SMC3K75CAHM3_A is AEC-Q101 qualified - explicitly certified for automotive use per the document revision dated 09-Jan-2024. It meets stress test requirements including temperature cycling, high-temperature reverse bias, and mechanical shock. This qualification validates its suitability for under-hood and cabin ECU applications where SMC3K75CAHM3_A protects power supplies and communication buses against ISO 7637-2 and ISO 16750-2 transients.
What package does SMC3K75CAHM3_A use, and is it RoHS-compliant?
SMC3K75CAHM3_A uses the SMC (DO-214AB) surface-mount package with matte tin-plated leads. It is halogen-free, RoHS-compliant, and rated MSL Level 1 (per J-STD-020) with a maximum reflow peak temperature of 260 °C. The SMC3K75CAHM3_A package dimensions are fully specified in the Vishay datasheet, including lead spacing, body width, and mounting pad layout recommendations for optimal thermal and mechanical reliability.
How does SMC3K75CAHM3_A perform under ISO 16750-2 Pulse B load dump conditions?
Under ISO 16750-2 Pulse B (12 V system, 101 V, 400 ms duration), the SMC3K75CAHM3_A exhibits an internal resistance (RI) of approximately 33 Ω - confirmed in Figure 9 of the datasheet. This low RI enables effective voltage clamping and energy dissipation without thermal runaway. The SMC3K75CAHM3_A sustains five such pulses at 1-minute intervals while maintaining VBR stability, demonstrating robustness for alternator load dump protection in automotive power distribution modules.
Does SMC3K75CAHM3_A meet ESD immunity standards?
Yes, SMC3K75CAHM3_A meets IEC 61000-4-2 with 30 kV contact and 30 kV air discharge ratings - verified per the datasheet's "Immunity to Static Electrical Discharge" table. This level of ESD protection allows SMC3K75CAHM3_A to serve as the sole front-end defense for exposed connectors, buttons, and sensor interfaces in consumer, industrial, and automotive systems without requiring supplemental ESD components.
SMC3K75CAHM3_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):
- 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/H FAQ
1.How can I place an order for SMC3K75CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K75CAHM3_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 SMC3K75CAHM3_A/H reliable?
The price and inventory of SMC3K75CAHM3_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 SMC3K75CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K75CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K75CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K75CAHM3_A/H?
SMC3K75CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K75CAHM3_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 SMC3K75CAHM3_A/H?
For technical support, including SMC3K75CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K75CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K75CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K75CAHM3_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 SMC3K75CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K75CAHM3_A/H?
All SMC3K75CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K75CAHM3_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 SMC3K75CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K75CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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