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Vishay General Semiconductor - Diodes Division SMC3K45CAHM3_A/H
- Part No.:
- SMC3K45CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K45CAHM3_A/H.pdf
- Description:
- 3KW, 45V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,341
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Product details
Overview
SMC3K45CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) designed for robust overvoltage protection in automotive and industrial power rails. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.7 V clamping voltage at 41.3 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed to protect MOSFETs and sensor signal lines against ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K45CAHM3_A datasheet, SMC3K45CAHM3_A pinout, SMC3K45CAHM3_A application, or SMC3K45CAHM3_A equivalent, key selection criteria include clamping performance under 10/1000 μs and 8/20 μs waveforms, bidirectional surge handling up to 317 A (8/20 μs), junction temperature range (−55 °C to +175 °C), and compliance with IEC 61000-4-2 (±30 kV ESD) and ISO 16750-2 Pulse b load dump.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, activating when transient voltage exceeds its reverse stand-off level (45 V) and clamping to ≤72.7 V at 41.3 A (10/1000 μs) or ≤94.6 V at 317 A (8/20 μs). Its low incremental surge resistance ensures minimal voltage overshoot during fast-rising transients.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing, UL 497B safety recognition (E136766), J-STD-020 MSL Level 1 (260 °C reflow), and JEDEC-compliant thermal resistance (RthJA = 90 °C/W, RthJM = 4.0 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V/24 V automotive systems. |
| VBR (min/max) | 50.0 V / 55.3 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM (10/1000 μs) | 72.7 V at 41.3 A - Clamping voltage under standard surge waveform; determines protected circuit's maximum transient exposure. |
| VC @ IPPM (8/20 μs) | 94.6 V at 317 A - Clamping under high-energy lightning-surge waveform; critical for ISO 16750-2 Pulse b load dump immunity. |
| PPPM | 3000 W - Peak pulse power rating (10/1000 μs); enables protection against repetitive inductive switching spikes without thermal runaway. |
| TJ max. | +175 °C - Maximum junction temperature; supports operation in under-hood automotive environments and high-power industrial enclosures. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact/air) - Protects downstream ICs from human-body-model electrostatic discharge events. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002/JESD 22-B102. Polarity: unmarked bidirectional device - cathode/anode not designated; terminals are symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current sink (reverse bias) | Carries surge current during positive transients when cathode is biased higher; identical electrical role to cathode due to bidirectionality. |
| Cathode (K) | Transient current sink (reverse bias) | Carries surge current during negative transients when anode is biased higher; functionally interchangeable with anode in this bidirectional device. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines and dual-polarity power rails without polarity concerns. |
| AEC-Q101 qualification | Validates reliability for automotive electronics including engine control units, body modules, and ADAS sensor interfaces. |
| 30 kW surge capability (8/20 μs) | Supports immunity to severe lightning-induced surges and alternator load dump events per ISO 16750-2 Pulse b. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot relative to breakdown threshold - critical for protecting 48 V tolerant components in next-gen vehicle architectures. |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking; compatible with high-volume automated assembly in industrial and automotive production lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Installed across 12 V battery feed to ECUs to suppress load dump transients (ISO 16750-2 Pulse b) and inductive switch-off spikes (ISO 7637-2 Pulse 1/2a). IC Role / Device Role / Timing Role: Shunt TVS diode providing sub-ns response to clamp transients before they reach downstream DC/DC converters and microcontrollers. Use Value: Limits peak rail voltage to ≤94.6 V during 317 A 8/20 μs surges, preventing latch-up or gate oxide damage in 36 V-rated power management ICs. |
Use Scenario: Placed on analog input lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp protecting precision ADC front-ends and op-amp buffers from ±2 kV EFT bursts and 40 V transients. Use Value: Maintains signal integrity by clamping to ≤72.7 V at 41.3 A (10/1000 μs), ensuring sensor output remains within common-mode range of isolated signal conditioners. |
| Telecom Power Supply Input | Consumer Device USB/Type-C Port |
Use Scenario: Mounted at AC/DC adapter input stage in telecom base station power supplies to absorb line surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS absorbing multi-kA 8/20 μs surges before they propagate into bulk capacitors and PFC controllers. Use Value: Withstands 30 kW peak pulse power and 317 A surge current while maintaining <1 μA leakage at 45 V - preserving no-load efficiency. |
Use Scenario: Integrated on VBUS line of USB-C ports in laptops and docking stations to meet IEC 61000-4-2 ±15 kV air/±8 kV contact ESD requirements. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp diverting ESD current away from USB PD controllers and port multiplexers. Use Value: Achieves ±30 kV ESD immunity with 72.7 V clamping - well below 20 V absolute maximum rating of most USB-C PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA | Lower PPPM (400 W vs. 3000 W); SMA package (smaller footprint, higher RthJA = 110 °C/W) | Suitable for low-energy signal-line protection only; insufficient for power rail or load dump duty. | Select SMC3K45CAHM3_A where 3000 W surge handling and automotive thermal robustness are required. |
| SMCJ45CA | Same SMC package and 3000 W rating, but not AEC-Q101 qualified; VBR min/max tighter (50.0–53.8 V) | Lacks automotive qualification; acceptable for industrial/commercial power rails without AEC compliance mandates. | Choose SMC3K45CAHM3_A when AEC-Q101 validation and UL 497B safety recognition are mandatory. |
Compared with SMAJ45CA and SMCJ45CA, SMC3K45CAHM3_A uniquely combines AEC-Q101 qualification, ±30 kV ESD rating, and 3000 W 10/1000 μs surge capacity in a thermally optimized SMC package - making it the only option qualified for under-hood automotive power rail protection per ISO 16750-2.
Availability
SMC3K45CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and telecom power supply surge protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMC3K45CAHM3_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, power efficiency, and automotive-grade qualification.
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 ISO-standard immunity are non-negotiable.
FAQ
What is the clamping voltage of SMC3K45CAHM3_A under a 10/1000 μs surge?
The SMC3K45CAHM3_A clamps to a maximum of 72.7 V at 41.3 A under the standard 10/1000 μs waveform. This value is measured at the specified peak pulse current and defines the upper voltage limit imposed on protected circuitry during typical inductive-switching transients. The SMC3K45CAHM3_A maintains this clamping performance across its full operating temperature range (−55 °C to +175 °C).
Is SMC3K45CAHM3_A qualified for automotive applications?
Yes, SMC3K45CAHM3_A is AEC-Q101 qualified and rated for automotive use. It meets stringent stress tests including temperature cycling, humidity bias, and mechanical shock, and is validated for deployment in engine control units, body electronics, and ADAS sensor modules. Its UL 497B safety recognition (file E136766) and compliance with ISO 7637-2 and ISO 16750-2 further confirm its suitability for automotive power rail protection.
What package does SMC3K45CAHM3_A use, and is it lead-free?
SMC3K45CAHM3_A uses the SMC (DO-214AB) surface-mount package with matte tin-plated leads. It is halogen-free, RoHS-compliant, and meets JESD 201 Class 2 whisker resistance. The "HM3_A" suffix explicitly denotes these environmental and reliability attributes, and the device is rated for MSL Level 1 handling with peak reflow temperature up to 260 °C.
How does SMC3K45CAHM3_A perform under 8/20 μs lightning surge conditions?
Under the 8/20 μs waveform, SMC3K45CAHM3_A clamps to a maximum of 94.6 V at 317 A, delivering 30 kW peak pulse power capability. This performance enables compliance with IEC 61000-4-5 surge immunity requirements and ISO 16750-2 Pulse b load dump testing in 12 V automotive systems. Its low incremental surge resistance ensures minimal voltage overshoot during fast-rising events.
What is the reverse leakage current of SMC3K45CAHM3_A at its stand-off voltage?
The SMC3K45CAHM3_A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 45 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage preserves system efficiency in always-on automotive modules and extends battery life in portable industrial sensors. Leakage remains below 5 μA across the full −55 °C to +125 °C operating range.
SMC3K45CAHM3_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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 41.3A
- 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)
SMC3K45CAHM3_A/H FAQ
1.How can I place an order for SMC3K45CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K45CAHM3_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 SMC3K45CAHM3_A/H reliable?
The price and inventory of SMC3K45CAHM3_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 SMC3K45CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K45CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K45CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K45CAHM3_A/H?
SMC3K45CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K45CAHM3_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 SMC3K45CAHM3_A/H?
For technical support, including SMC3K45CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K45CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K45CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K45CAHM3_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 SMC3K45CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K45CAHM3_A/H?
All SMC3K45CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K45CAHM3_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 SMC3K45CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K45CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K45CAHM3_A/H Tags
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