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Vishay General Semiconductor - Diodes Division SMC5K51CA-M3/H
- Part No.:
- SMC5K51CA-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K51CA-M3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,634
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Product details
Overview
SMC5K51CA-M3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 5000 W peak pulse power (10/1000 μs), 82.4 V clamping voltage at 60.7 A, and 51 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMC5K51CA-M3/H datasheet, SMC5K51CA-M3/H pinout, SMC5K51CA-M3/H application, or SMC5K51CA-M3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance values, clamping performance under 10/1000 μs and 8/20 μs transients, and direct alternative part comparisons for robust circuit protection design.
Technical Context
This TVS diode operates bidirectionally without cathode marking and features low incremental surge resistance to maintain stable clamping during fast transients. Its breakdown voltage range is 56.7–62.7 V at 1 mA test current, with maximum reverse leakage of 1.0 μA at 51 V stand-off voltage.
Thermal performance is defined by junction-to-ambient resistance of 90 °C/W and junction-to-mount resistance of 4.0 °C/W per JEDEC 51-2A and 51-14 standards. It meets MSL Level 1, JESD201 Class 2 whisker testing, and UL 497B safety recognition (E136766).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR min/max | 56.7 V / 62.7 V - Breakdown occurs within this range at 1 mA; ensures predictable turn-on threshold across temperature and lot. |
| VC @ IPPM | 82.4 V @ 60.7 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient stress level. |
| PPPM | 5000 W - Peak pulse power handling capability; supports high-energy lightning and inductive switching surges. |
| TJ max | +175 °C - Maximum junction temperature; enables reliable operation in under-hood automotive and industrial environments. |
| RthJA | 90 °C/W - Thermal resistance to ambient on standard FR4 PCB; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, no cathode band (bidirectional polarity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical terminals due to bidirectional construction; either end connects to protected line or ground without orientation constraint. |
| Case (cathode side marking absent) | Thermal and mechanical interface | Exposed metal slug provides primary heat dissipation path to PCB copper; requires adequate thermal pad area per JEDEC 51-2A footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity concerns. |
| 40 kW surge rating (8/20 μs) | Supports telecom-grade lightning surge immunity (IEC 61000-4-5) without cascaded protection stages. |
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics applications requiring zero defect reliability over temperature and life cycle. |
| UL 497B recognition (E136766) | Meets safety agency requirements for secondary circuit protection in industrial and telecom equipment. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device placed at ECU input filter stage to limit bus voltage excursion below 85 V. Use Value: Withstands 5000 W pulses and maintains 82.4 V clamping at 60.7 A, ensuring downstream regulators and microcontrollers remain within absolute maximum ratings. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) from ESD and field wiring surges in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point to shunt transients before signal conditioning circuitry. Use Value: 1.0 μA leakage at 51 V preserves loop accuracy; fast response time prevents latch-up in precision op-amps and ADC drivers. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding Ethernet PHY interfaces and PoE injectors against induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) in hybrid protection architecture. Use Value: 40 kW (8/20 μs) rating handles residual energy passed through upstream GDT; 30 kV HBM ESD immunity meets IEC 61000-4-2 Level 4. | Use Scenario: Input-stage overvoltage suppression in universal-input AC/DC adapters subjected to mains transients per IEC 61000-4-4. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor to clamp line-to-line surges before rectifier and controller ICs. Use Value: 51 V VWM aligns with 48 V DC bus designs; 175 °C TJmax supports compact, thermally constrained adapter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA-E3/5A (Vishay) | Lower peak pulse power (400 W vs. 5000 W); SMA package (DO-214AC); same VWM/VC family. | Intended for lower-energy ESD and board-level noise; not suitable for load dump or lightning surges. | Select SMC5K51CA-M3/H when system-level surge immunity (IEC 61000-4-5, ISO 7637-2) is required. |
| 1.5KE51CA (Littelfuse) | Same VWM (51 V) and bidirectional function; axial leaded DO-201 package; 5000 W rating; no AEC-Q101 qualification. | Lacks automotive qualification and surface-mount compatibility; requires through-hole layout and manual assembly. | Choose SMC5K51CA-M3/H for automated SMT production and AEC-Q101-compliant automotive designs. |
Compared with SMAJ51CA-E3/5A and 1.5KE51CA, the SMC5K51CA-M3/H delivers 12.5× higher surge power in an AEC-Q101-qualified SMT package, enabling single-device compliance with automotive load dump and industrial lightning standards without layout or qualification compromises.
Availability
SMC5K51CA-M3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge protection, and consumer power adapter input stage applications requiring stable component supply and long-term lifecycle support.
Supply support for SMC5K51CA-M3/H 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 validation.
The SMC5KxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, high-reliability transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 qualification and UL safety recognition are mandatory.
FAQ
What is the clamping voltage of the SMC5K51CA-M3/H under a 10/1000 μs surge?
The SMC5K51CA-M3/H clamps to a maximum of 82.4 V at 60.7 A under a 10/1000 μs waveform, as specified in the Vishay datasheet Document Number 87024. This value defines the upper voltage limit imposed on protected circuits during standardized surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMC5K51CA-M3/H achieves this while maintaining low incremental surge resistance for consistent performance across multiple transients.
Is the SMC5K51CA-M3/H qualified for automotive applications?
Yes, the SMC5K51CA-M3/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision dated 10-Sep-2024. This qualification validates its reliability for use in automotive powertrain, body control, and infotainment systems exposed to extended temperature cycling, mechanical shock, and humidity. The SMC5K51CA-M3/H also meets MSL Level 1 and JESD201 Class 2 whisker testing, supporting reflow soldering and long-term under-hood operation up to +175 °C junction temperature.
What is the standoff voltage (VWM) and why does it matter for SMC5K51CA-M3/H selection?
The SMC5K51CA-M3/H has a standoff voltage (VWM) of 51 V, meaning it remains non-conductive up to this reverse voltage under normal operating conditions. This parameter ensures minimal leakage current (≤1.0 μA) and avoids interference with signal integrity or power rail regulation. Selecting a TVS with appropriate VWM - typically ≥10–15% above the system's maximum steady-state voltage - prevents false triggering while preserving headroom for transient suppression. For 48 V DC systems, the SMC5K51CA-M3/H provides optimal margin.
Does the SMC5K51CA-M3/H have polarity markings, and how is it mounted?
No, the SMC5K51CA-M3/H has no cathode band or polarity marking because it is a bidirectional TVS diode. Both terminals are functionally identical, allowing flexible placement across protected lines (e.g., line-to-line or line-to-ground) without orientation constraints. Mounting follows the SMC (DO-214AB) outline: symmetric leads, thermal slug centered beneath the body, and requires a JEDEC-compliant copper pad for thermal management. The SMC5K51CA-M3/H is compatible with standard reflow profiles including peak temperatures up to 260 °C (MSL Level 1).
How does the SMC5K51CA-M3/H compare to standard SMAJ-series TVS diodes?
The SMC5K51CA-M3/H delivers 5000 W peak pulse power (10/1000 μs), versus 400 W for SMAJ51CA-E3/5A - a 12.5× difference - due to its larger SMC package and optimized silicon die. It also carries AEC-Q101 qualification and UL 497B recognition, which SMAJ devices lack. While both share 51 V VWM, the SMC5K51CA-M3/H is intended for system-level surge immunity (e.g., ISO 7637-2, IEC 61000-4-5), whereas SMAJ parts target board-level ESD. The SMC5K51CA-M3/H is not a drop-in replacement for SMAJ due to package and power-class differences.
SMC5K51CA-M3/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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 60.7A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K51CA-M3/H FAQ
1.How can I place an order for SMC5K51CA-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K51CA-M3/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 SMC5K51CA-M3/H reliable?
The price and inventory of SMC5K51CA-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC5K51CA-M3/H is usually 5 days.
3.What payment methods are accepted for SMC5K51CA-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K51CA-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K51CA-M3/H?
SMC5K51CA-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K51CA-M3/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 SMC5K51CA-M3/H?
For technical support, including SMC5K51CA-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K51CA-M3/H requirements.
6.How does Aetrix verify that SMC5K51CA-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K51CA-M3/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 SMC5K51CA-M3/H meets industry standards.
7.What is the process for return or replacement of SMC5K51CA-M3/H?
All SMC5K51CA-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K51CA-M3/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 SMC5K51CA-M3/H part is unused and in its original packaging.
Return procedure for SMC5K51CA-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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