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Vishay General Semiconductor - Diodes Division SMC5K51A-M3/H
- Part No.:
- SMC5K51A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K51A-M3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:840
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Product details
Overview
SMC5K51A-M3/H from Vishay General Semiconductor is a unidirectional 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 maximum clamping voltage at 60.7 A, and 56.7–62.7 V breakdown voltage range. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMC5K51A-M3/H datasheet, SMC5K51A-M3/H pinout, SMC5K51A-M3/H application, or SMC5K51A-M3/H equivalent, this device delivers verified AEC-Q101 qualification (for HM3 variants only), 30 kV ESD immunity per IEC 61000-4-2, and halogen-free RoHS-compliant construction - critical for automotive-grade transient suppression design.
Technical Context
This TVS diode operates as a unidirectional clamping device with fast response time and low incremental surge resistance, enabling effective suppression of inductive switching transients and lightning-induced surges on DC power rails and signal paths. Its thermal resistance junction-to-mount is 4.0 °C/W, supporting robust power dissipation under repetitive surge conditions.
The SMC5K51A-M3/H exhibits a stand-off voltage of 51 V, reverse leakage ≤1.0 μA at VWM, and clamps to 82.4 V at 60.7 A (10/1000 μs), with an 8/20 μs clamping voltage of 107 V at 374 A - confirming suitability for both IEC 61000-4-5 and ISO 7637-2 compliant protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 56.7–62.7 V at 1.0 mA test current - defines reliable turn-on threshold for overvoltage clamping |
| Stand-off Voltage VWM | 51 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| Peak Pulse Power PPPM | 5000 W (10/1000 μs) - sustains high-energy transients without failure in automotive load-dump scenarios |
| Clamping Voltage VC | 82.4 V at 60.7 A (10/1000 μs) - limits protected circuit voltage to safe level during surge |
| ESD Immunity | 30 kV contact & air discharge (IEC 61000-4-2) - ensures robustness against handling and system-level ESD events |
| Operating Temperature | -55 °C to +150 °C - supports under-hood and industrial ambient environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount footprint with 90 °C/W junction-to-ambient thermal resistance |
Pinout & Package
SMC5K51A-M3/H uses the standard SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, cathode indicated by a color band. Mounting pad layout follows JEDEC MS-013AC, with recommended land pattern dimensions of 3.20 mm × 4.69 mm (length × width).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Current exit terminal during clamping | Connected to protected line (e.g., 51 V rail or signal path); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise protection of positive-rail systems without reverse-bias leakage concerns |
| 5000 W peak pulse power rating | Withstands severe load-dump transients per ISO 7637-2 Level 5 without degradation |
| AEC-Q101 qualified variant available | HM3 suffix versions meet automotive reliability standards; SMC5K51A-M3/H is industrial-grade (non-AEC) |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements for industrial and consumer end equipment |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak, simplifying SMT manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery management system (BMS) input rails from load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between rail and ground, activated within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤82.4 V during 60.7 A surge, preventing damage to downstream DC-DC controllers and monitoring ICs. |
Use Scenario: Shielding analog output lines of pressure sensors in factory automation PLC modules from EFT and surge coupling. IC Role / Device Role / Timing Role: Standby protection element across signal and ground, responding in <1 ns to clamp induced spikes. Use Value: Maintains signal integrity below 51 V stand-off while suppressing 30 kV ESD events per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Computer PSU 12 V/24 V Rail Clamping |
|
Use Scenario: Safeguarding PoE-powered network switches' 57 V DC input against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter, absorbing energy before regulation stage. Use Value: Delivers 5000 W (10/1000 μs) clamping capability with 107 V @ 374 A (8/20 μs), meeting IEC 61000-4-5 Level 4. |
Use Scenario: Adding secondary overvoltage protection to ATX PSUs' 12 V and 24 V outputs against regulator failure or backfeed. IC Role / Device Role / Timing Role: Fail-safe crowbar-style clamp connected between output rail and chassis ground. Use Value: Activates at 56.7 V breakdown to limit rail excursion, complementing primary OVP circuits with physical voltage ceiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-M3/84A | Lower peak pulse power (400 W), SMA package (smaller footprint, higher RthJA = 150 °C/W) | Suitable for lower-energy surges; not rated for automotive load-dump or IEC 61000-4-5 Level 4 | Select when space-constrained and surge energy ≤400 W; verify thermal derating at elevated ambient |
| SMCJ51A-M3/H | Same SMC package, but 1500 W rating (10/1000 μs); lower clamping voltage (77.4 V @ 57.4 A) | Balances cost and performance for mid-tier industrial applications where 5000 W is excessive | Choose when full 5000 W headroom is unnecessary and tighter clamping margin is prioritized over energy capacity |
Compared with SMC5K51A-M3/H, SMAJ51A-M3/84A offers compact size but sacrifices >90 % surge energy handling, while SMCJ51A-M3/H retains the same package and thermal interface but trades peak power for improved clamping precision - making it suitable for cost-sensitive designs with moderate surge exposure.
Availability
SMC5K51A-M3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply and consistent halogen-free RoHS compliance.
Supply support for SMC5K51A-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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SMC5K51A-M3/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for demanding transient suppression in automotive, industrial, and telecom infrastructure where sustained 5000 W surge capability is required.
FAQ
What is the breakdown voltage tolerance for SMC5K51A-M3/H?
The SMC5K51A-M3/H has a specified breakdown voltage (VBR) range of 56.7 V to 62.7 V at 1.0 mA test current, representing ±10.5 % tolerance around the nominal 51 V stand-off rating. This tolerance is confirmed in the Electrical Characteristics table of Vishay document 87742 and applies directly to the SMC5K51A-M3/H variant.
Is SMC5K51A-M3/H AEC-Q101 qualified?
No, SMC5K51A-M3/H is not AEC-Q101 qualified. Only variants with the HM3 suffix (e.g., SMC5K51AHM3_A/H) carry AEC-Q101 qualification. The "M3/H" suffix indicates halogen-free, RoHS-compliant construction and MSL Level 1 rating, but does not imply automotive qualification. SMC5K51A-M3/H is rated for industrial-grade applications.
What is the maximum clamping voltage of SMC5K51A-M3/H at 8/20 μs surge waveform?
The SMC5K51A-M3/H clamps to a maximum of 107 V at 374 A under the 8/20 μs surge waveform, as specified in the Electrical Characteristics table of Vishay document 87742. This value is critical for designing protection margins in IEC 61000-4-5 compliant systems and must be used alongside the 10/1000 μs clamping voltage (82.4 V at 60.7 A) for comprehensive surge analysis.
Does SMC5K51A-M3/H have polarity marking, and how is it identified?
Yes, SMC5K51A-M3/H features a visible cathode band on the SMC (DO-214AB) package body - a distinct color stripe indicating the cathode terminal. This marking aligns with JEDEC DO-214AB standard orientation and must be observed during PCB layout to ensure correct unidirectional clamping direction. The anode is the opposite end, with no band.
What is the thermal resistance junction-to-ambient for SMC5K51A-M3/H?
The thermal resistance junction-to-ambient (RthJA) for SMC5K51A-M3/H is 90 °C/W, measured per JEDEC 51-2A on a standard FR4 PCB with 2 oz. copper and the recommended mounting pad layout. This value governs steady-state power dissipation limits and must be applied with derating curves from Figure 2 of Vishay document 87742 for operation above 25 °C ambient.
SMC5K51A-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:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K51A-M3/H FAQ
1.How can I place an order for SMC5K51A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K51A-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 SMC5K51A-M3/H reliable?
The price and inventory of SMC5K51A-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 SMC5K51A-M3/H is usually 5 days.
3.What payment methods are accepted for SMC5K51A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K51A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K51A-M3/H?
SMC5K51A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K51A-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 SMC5K51A-M3/H?
For technical support, including SMC5K51A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K51A-M3/H requirements.
6.How does Aetrix verify that SMC5K51A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K51A-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 SMC5K51A-M3/H meets industry standards.
7.What is the process for return or replacement of SMC5K51A-M3/H?
All SMC5K51A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K51A-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 SMC5K51A-M3/H part is unused and in its original packaging.
Return procedure for SMC5K51A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K51A-M3/H Tags
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