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Vishay General Semiconductor - Diodes Division SMC3K43CAHM3/57
- Part No.:
- SMC3K43CAHM3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K43CAHM3/57.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,070
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Product details
Overview
SMC3K43CAHM3/57 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 43 V standoff voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), and 43.2 A peak pulse current (IPPM). It clamps transients to ≤69.4 V and is AEC-Q101 qualified for automotive-grade reliability.
For engineers reviewing the SMC3K43CAHM3/57 datasheet, SMC3K43CAHM3/57 pinout, SMC3K43CAHM3/57 application, or SMC3K43CAHM3/57 equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, halogen-free RoHS-compliant construction with HM3 suffix, and suitability for protecting MOSFETs, sensor signal lines, and IC power rails against inductive switching surges.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown range (47.8–52.8 V at 1 mA test current). Its low incremental surge resistance and fast response time ensure effective suppression of transient energy before downstream components are damaged.
The SMC3K43CAHM3/57 is designed for unidirectional PCB mounting only - not recommended for bottom-side wave soldering - and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Its junction capacitance is unspecified in the provided documentation but typical for SMC-packaged TVS devices in this power class.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on behavior across production lots. |
| VC @ IPPM | ≤69.4 V - clamped voltage during 43.2 A 10/1000 μs surge; determines worst-case overvoltage seen by protected load. |
| PPPM | 3000 W - peak pulse power handling per 10/1000 μs waveform; enables robust protection against high-energy transients. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Polarity | Bidirectional - provides symmetrical clamping for AC-coupled or floating signal lines without polarity concerns. |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation for thermal management. |
Pinout & Package
SMC3K43CAHM3/57 uses the standard SMC (DO-214AB) package: a two-terminal, surface-mount plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional polarity means no marking on the device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Transient conduction path (anode-to-cathode during positive surge; cathode-to-anode during negative surge) | Acts as common terminal for bidirectional clamping; connects to protected line and ground reference via low-inductance layout. |
| Anode | Transient conduction path (reverse of cathode role during opposite polarity surge) | Completes symmetrical avalanche path; requires equal trace impedance to ground as cathode for balanced clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring long-term reliability under thermal cycling and vibration. |
| 3000 W peak pulse power (10/1000 μs) | Enables protection against severe load-dump and inductive kick events in 12 V and 24 V vehicle electrical systems. |
| Halogen-free, RoHS-compliant HM3 suffix | Meets automotive environmental compliance requirements and JESD 201 Class 2 whisker resistance for lead finish stability. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and compatibility with standard lead-free reflow profiles up to 260 °C peak temperature. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails feeding ECUs, lighting modules, and body control units from alternator load dump and relay coil flyback. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed between power rail and chassis ground. Use Value: Limits surge voltage to ≤69.4 V during 43.2 A transients, preventing latch-up or gate oxide damage in downstream MOSFETs and regulators. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA, 0–5 V) from ESD and cable discharge events in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional shunt protector mounted at connector interface before signal conditioning circuitry. Use Value: Clamps ±15 kV contact ESD per IEC 61000-4-2 without degrading signal integrity due to low leakage (<2 μA at 43 V). |
| Telecom Line Interface Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding Ethernet PHY power pins and auxiliary bias rails in PoE-powered switches and base stations from lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on DC input side of isolated DC/DC converters. Use Value: Absorbs 3000 W pulses while maintaining <2 μA leakage at 43 V, preserving standby efficiency and meeting UL 497B safety certification. |
Use Scenario: Overvoltage protection on primary-side rectified DC bus of universal-input AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Secondary-stage clamping device after bridge rectifier and bulk capacitor. Use Value: Prevents catastrophic failure of switching FETs during AC line swells by clamping to ≤69.4 V with sub-nanosecond response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K43CAHM3_A/57 | Same VWM (43 V), VBR (47.8–52.8 V), and PPPM (3000 W); updated revision with enhanced surge lifetime testing. | Identical functional use; intended as direct replacement with improved long-term reliability validation. | Select when new design requires latest qualification data and extended surge endurance per AEC-Q101 rev D. |
| SMAJ43A | Lower PPPM (400 W), smaller SMA package, unidirectional polarity only, same VWM/VBR range. | Limited to lower-energy transients; unsuitable for automotive load dump or industrial motor drive environments. | Choose only for cost-sensitive consumer applications where 43.2 A surge current and 3000 W rating are unnecessary. |
Compared with SMC3K43CAHM3/57, SMC3K43CAHM3_A/57 offers identical electrical specs with updated process controls, while SMAJ43A trades significant pulse power and automotive qualification for reduced size and cost - making it viable only in non-automotive, low-surge contexts.
Availability
SMC3K43CAHM3/57 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor signal protection, telecom line interface protection, and consumer power adapter input stage applications requiring stable component supply and AEC-Q101 compliance.
Supply support for SMC3K43CAHM3/57 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, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade solutions.
The SMC3KxxCAHM3 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What does the 'HM3' suffix mean in SMC3K43CAHM3/57?
The HM3 suffix in SMC3K43CAHM3/57 indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this automotive-grade variant from commercial-grade M3 versions and confirms compliance with stringent automotive reliability standards.
Is SMC3K43CAHM3/57 suitable for bidirectional signal line protection?
Yes, SMC3K43CAHM3/57 is explicitly specified as bidirectional and has no polarity marking. It provides symmetrical clamping for AC-coupled or floating interfaces such as RS-485, CAN bus stubs, or differential sensor outputs - ensuring protection regardless of transient polarity.
What is the maximum clamping voltage of SMC3K43CAHM3/57 during a surge event?
The maximum clamping voltage of SMC3K43CAHM3/57 is 69.4 V when subjected to its rated 43.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and production lot variations per the Vishay datasheet.
Does SMC3K43CAHM3/57 require special PCB layout considerations?
Yes, SMC3K43CAHM3/57 requires low-inductance layout: short, wide traces to ground, symmetric routing for both terminals, and adherence to the recommended 8.0 mm × 8.0 mm copper pad area. It is not recommended for bottom-side wave soldering per Vishay's mechanical guidelines.
How does SMC3K43CAHM3/57 differ from the older SMC3K43CA-M3/57?
SMC3K43CAHM3/57 adds AEC-Q101 qualification, JESD 201 Class 2 whisker resistance, and enhanced surge lifetime validation versus the commercial-grade SMC3K43CA-M3/57. Both share identical electrical specs (VWM = 43 V, VBR = 47.8–52.8 V, PPPM = 3000 W), but only SMC3K43CAHM3/57 is approved for automotive use.
SMC3K43CAHM3/57 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 43.2A
- 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)
SMC3K43CAHM3/57 FAQ
1.How can I place an order for SMC3K43CAHM3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K43CAHM3/57 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 SMC3K43CAHM3/57 reliable?
The price and inventory of SMC3K43CAHM3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K43CAHM3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K43CAHM3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K43CAHM3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K43CAHM3/57?
SMC3K43CAHM3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K43CAHM3/57 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 SMC3K43CAHM3/57?
For technical support, including SMC3K43CAHM3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K43CAHM3/57 requirements.
6.How does Aetrix verify that SMC3K43CAHM3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K43CAHM3/57 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 SMC3K43CAHM3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K43CAHM3/57?
All SMC3K43CAHM3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K43CAHM3/57, 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 SMC3K43CAHM3/57 part is unused and in its original packaging.
Return procedure for SMC3K43CAHM3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K43CAHM3/57 Tags
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