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Vishay General Semiconductor - Diodes Division SMC5K20A-M3/H
- Part No.:
- SMC5K20A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K20A-M3/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
SMC5K20A-M3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It delivers 5000 W peak pulse power (10/1000 μs), clamps at 32.4 V under 154 A surge, and features 22.2–24.5 V breakdown voltage with 20 V stand-off rating - ideal for safeguarding MOSFETs, ICs, and sensor signal lines in automotive and industrial power systems.
For engineers reviewing the SMC5K20A-M3/H datasheet, SMC5K20A-M3/H pinout, SMC5K20A-M3/H application, or SMC5K20A-M3/H equivalent, key selection criteria include its AEC-Q101 qualification, 30 kV ESD immunity per IEC 61000-4-2, low incremental surge resistance, and halogen-free RoHS-compliant M3 termination - all critical for high-reliability automotive and industrial transient suppression designs.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging avalanche breakdown to divert transient energy away from protected circuitry. Its 22.2–24.5 V VBR range ensures precise triggering above normal operating voltage while maintaining 20 V VWM, and its 32.4 V clamping voltage at 154 A (10/1000 μs) provides tight overvoltage limiting with minimal let-through stress.
Thermally, it supports junction temperatures up to +150 °C and exhibits RthJA = 90 °C/W on standard FR4 PCBs. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility confirm suitability for automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 5000 W - sustains high-energy transients without failure in automotive load-dump or inductive switching events |
| Breakdown Voltage VBR | 22.2–24.5 V at 1 mA - defines precise avalanche initiation threshold for reliable overvoltage detection |
| Stand-off Voltage VWM | 20 V - maximum continuous reverse voltage before leakage exceeds 2 μA, ensuring no false triggering |
| Clamping Voltage VC | 32.4 V at 154 A (10/1000 μs) - limits downstream voltage stress during surge, protecting 24 V system ICs |
| ESD Immunity | 30 kV contact/air discharge (IEC 61000-4-2) - withstands severe electrostatic events in handling and operation |
| Junction Temperature Range | −55 to +150 °C - enables deployment in under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded epoxy case rated UL 94 V-0; cathode indicated by color band; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to ground or low-side reference | Provides return path for surge current when cathode is tied to protected line - essential for unidirectional clamping configuration |
| Cathode | Transient voltage sensing and clamping node; connected to protected signal/power line | Acts as the primary protection interface - avalanche breakdown occurs here to shunt surge current to ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise overvoltage protection on DC-biased lines (e.g., 24 V supply rails) without interfering with normal forward operation |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping accuracy and reducing stress on downstream components |
| AEC-Q101 qualification (HM3 variant) | Confirms compliance with automotive stress tests including HTGB, TCT, and ESD - required for engine control, ADAS, and body electronics |
| Halogen-free, RoHS-compliant M3 termination | Meets global environmental regulations and JESD 201 Class 2 whisker resistance for long-term reliability in lead-free assembly |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-bake requirements and supports standard SMT processes without moisture-related popcorn failures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges exceeding 32.4 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during 120 V/50 ms load-dump events. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Clamping device on 4–20 mA or 0–10 V signal paths to suppress EFT bursts and inductive coupling. Use Value: Maintains signal integrity and prevents ADC saturation or op-amp input stage damage during 4 kV EFT exposure. |
| Telecom DC Power Input Stage | Consumer Power Adapter Secondary Side |
Use Scenario: Safeguarding PoE-powered switch ports and base station RF front-end supplies from lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on −48 V DC input, coordinated with upstream MOVs and fuses. Use Value: Limits let-through voltage to <35 V during 8/20 μs 1660 A surges, preserving PMIC and Ethernet PHY functionality. |
Use Scenario: Secondary-side transient suppression on USB-C PD adapter 5–20 V output rails. IC Role / Device Role / Timing Role: Fast-response TVS across VBUS and GND to absorb plug/unplug spikes and cable ESD. Use Value: Ensures USB PD controller remains functional after repeated 15 kV air-discharge ESD events per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-M3/84A | Lower peak pulse power (400 W vs. 5000 W); SMA package (smaller footprint, higher thermal resistance) | Suitable only for low-energy transients (e.g., board-level ESD), not automotive load dump or industrial surges | Select when space-constrained and surge energy ≤ 400 W; avoid for 24 V system rail protection. |
| SMC5K20AHM3_A/H | Identical electrical specs; adds AEC-Q101 qualification and HM3 suffix (halogen-free + automotive grade) | Required for automotive production; same footprint and clamping behavior but certified for harsh environment validation | Choose for OEM automotive programs where AEC-Q101 documentation and traceability are mandatory. |
Compared with SMC5K20A-M3/H, SMAJ20A-M3/84A offers compact size but insufficient energy handling for demanding transients, while SMC5K20AHM3_A/H provides identical protection performance plus full automotive qualification - making it the drop-in upgrade path for certified vehicle systems.
Availability
SMC5K20A-M3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor guarding, telecom DC input stages, and consumer power adapter secondary-side surge suppression requiring stable component supply and consistent parametric performance across production lots.
Supply support for SMC5K20A-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, efficiency, and application-specific optimization.
The SMC5KxxA series was engineered specifically for high-energy transient suppression in automotive and industrial environments, delivering AEC-Q101-qualified robustness with industry-leading 5000 W pulse capability in the SMC package.
FAQ
What is the clamping voltage of the SMC5K20A-M3/H under a 10/1000 μs surge?
The SMC5K20A-M3/H clamps at 32.4 V when subjected to a 154 A peak pulse with a 10/1000 μs waveform. This value is measured per Figure 3 in the Vishay datasheet (Document Number 87742) and represents the maximum voltage seen across the device during standardized surge testing - critical for verifying safe operation of downstream 24 V-rated ICs. The SMC5K20A-M3/H maintains this clamping performance across its qualified temperature range.
Is the SMC5K20A-M3/H AEC-Q101 qualified?
No - the SMC5K20A-M3/H is not AEC-Q101 qualified. Only variants with the HM3 suffix (e.g., SMC5K20AHM3_A/H) carry AEC-Q101 certification. The SMC5K20A-M3/H uses the M3 termination (halogen-free, RoHS-compliant, JESD 201 Class 2 whisker resistant) but lacks the full automotive stress test validation required for AEC-Q101. For automotive production, specify the HM3 version of the SMC5K20A-M3/H.
What is the standoff voltage and leakage current specification for the SMC5K20A-M3/H?
The SMC5K20A-M3/H has a maximum reverse standoff voltage (VWM) of 20 V and a maximum reverse leakage current of 2.0 μA at that voltage, measured at 25 °C. This low leakage ensures minimal power loss and no false triggering in 24 V systems operating near nominal voltage. The SMC5K20A-M3/H maintains this specification across its full operating temperature range per the Vishay datasheet Table on page 2.
Can the SMC5K20A-M3/H be used in bidirectional protection circuits?
No - the SMC5K20A-M3/H is a unidirectional TVS diode, designed exclusively for DC-biased or polarity-defined applications such as 24 V power rails or signal lines referenced to ground. Bidirectional protection requires symmetrical devices like the SMBJ20CA-M3/84A. Using the SMC5K20A-M3/H in AC or floating configurations risks reverse conduction failure or inadequate clamping - always verify polarity alignment before deploying the SMC5K20A-M3/H.
What is the thermal resistance and maximum junction temperature of the SMC5K20A-M3/H?
The SMC5K20A-M3/H has a junction-to-ambient thermal resistance (RthJA) of 90 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A, and a maximum junction temperature (TJ) of +150 °C. Its junction-to-mount thermal resistance (RthJM) is 4.0 °C/W, supporting efficient heat transfer to heatsinks or copper planes. These values ensure reliable operation in under-hood automotive and industrial enclosures where ambient temperatures exceed 85 °C - confirmed in the Thermal Characteristics section of the SMC5K20A-M3/H datasheet.
SMC5K20A-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 154.3A
- 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 (SMCJ)
SMC5K20A-M3/H FAQ
1.How can I place an order for SMC5K20A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K20A-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 SMC5K20A-M3/H reliable?
The price and inventory of SMC5K20A-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 SMC5K20A-M3/H is usually 5 days.
3.What payment methods are accepted for SMC5K20A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K20A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K20A-M3/H?
SMC5K20A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K20A-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 SMC5K20A-M3/H?
For technical support, including SMC5K20A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K20A-M3/H requirements.
6.How does Aetrix verify that SMC5K20A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMC5K20A-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 SMC5K20A-M3/H meets industry standards.
7.What is the process for return or replacement of SMC5K20A-M3/H?
All SMC5K20A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K20A-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 SMC5K20A-M3/H part is unused and in its original packaging.
Return procedure for SMC5K20A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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