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Vishay General Semiconductor - Diodes Division SMC3K20CAHM3_A/I
- Part No.:
- SMC3K20CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K20CAHM3_A/I.pdf
- Description:
- 3KW, 20V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,655
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Product details
Overview
SMC3K20CAHM3_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 delivers 3000 W peak pulse power (10/1000 μs), clamps at 32.4 V under 92.6 A surge, and features a 22.2–24.5 V breakdown voltage range with ≤2.0 μA leakage at 20 V stand-off. It is AEC-Q101 qualified and used to protect MOSFETs and sensor signal lines against ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K20CAHM3_A datasheet, SMC3K20CAHM3_A pinout, SMC3K20CAHM3_A application, or SMC3K20CAHM3_A equivalent, key selection criteria include its 32.4 V clamping voltage at 92.6 A, bidirectional polarity, SMC (DO-214AB) package compatibility, and compliance with ISO 16750-2 Pulse b and IEC 61000-4-2 ESD (30 kV contact/air).
Technical Context
This TVS diode operates as a voltage-clamping device across power or signal lines, activating when transient voltage exceeds its 22.2–24.5 V breakdown threshold. Its low incremental surge resistance ensures rapid energy diversion during 10/1000 μs and 8/20 μs pulses, while maintaining stable clamping up to 175 °C junction temperature.
The device meets AEC-Q101 stress testing for automotive reliability and supports high-energy immunity per ISO 7637-2 and ISO 16750-2. Its halogen-free, RoHS-compliant SMC package enables reflow soldering per J-STD-002 and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 22.2–24.5 V at 1.0 mA test current - defines precise turn-on threshold for reliable transient detection |
| Stand-off Voltage (VWM) | 20 V - maximum continuous reverse operating voltage without leakage exceeding 2.0 μA |
| Clamping Voltage (VC) | 32.4 V at 92.6 A (10/1000 μs) - limits downstream voltage stress during worst-case surge events |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - sustains high-energy transients without failure in automotive load-dump scenarios |
| ESD Withstand | 30 kV per IEC 61000-4-2 (contact & air) - protects against human-body-model electrostatic discharge |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood automotive environments and industrial enclosures |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.220–0.246 inch body width and matte tin-plated leads |
Pinout & Package
SMC3K20CAHM3_A uses the SMC (DO-214AB) package: a molded, halogen-free, RoHS-compliant case with matte tin-plated leads. Polarity is unmarked on bidirectional variants; the device has two symmetrical terminals with no anode/cathode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (bidirectional) | Surge current path | Both terminals conduct equally during positive or negative transients - no orientation required during PCB placement |
| Case / Body | Thermal interface | Exposed copper area provides thermal conduction path to PCB copper pour; RthJM = 4.0 °C/W improves heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 30 kW surge rating (8/20 μs) | Handles high-current lightning-induced surges per IEC 61000-4-5 Level 4 without degradation |
| AEC-Q101 qualification | Validated for automotive powertrain and chassis applications requiring zero-failure reliability over lifetime |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT manufacturing |
| UL 497B recognition (E136766) | Meets safety standards for telecom and industrial equipment requiring certified transient protection |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 Pulse 2a (112 V, 50 μs) transients. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly across input rail upstream of DC/DC converter. Use Value: Limits rail voltage to ≤32.4 V during 92.6 A surge, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and switching noise in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal lines before ADC input. Use Value: Clamps fast 150 ns transients to <35 V while adding <10 pF capacitance - preserves signal integrity at ≤1 MHz bandwidth. |
| Telecom Line Surge Protection | Consumer Power Adapter Input Protection |
|
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras) against induced surges on Ethernet pairs per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC output rails feeding powered devices. Use Value: Absorbs 30 kW (8/20 μs) surges without latch-up, enabling compliance with EN 61000-4-5 Level 4. |
Use Scenario: Overvoltage suppression on AC-DC adapter primary-side rectified bus against line transients. IC Role / Device Role / Timing Role: Secondary-side clamping device across bulk capacitor to limit voltage overshoot during startup or fault. Use Value: Maintains 20 V stand-off while clamping to 32.4 V - prevents capacitor overvoltage and MOSFET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Lower PPPM (400 W), SMA package (smaller footprint, higher RthJA = 110 °C/W) | Suitable only for low-energy consumer electronics; not AEC-Q101 qualified | Select when board space is constrained and surge energy is limited to <500 W (10/1000 μs) |
| SMCJ20CA | Same SMC package but lower PPPM (1500 W), non-AEC-Q101, no UL 497B recognition | Lacks automotive qualification and telecom safety certification; intended for cost-sensitive industrial use | Choose for non-automotive applications where 1500 W clamping suffices and safety certifications are optional |
Compared with SMC3K20CAHM3_A, SMAJ20CA offers smaller size but sacrifices 87% peak power handling and automotive qualification, while SMCJ20CA retains the SMC form factor but halves surge capability and omits critical safety and reliability certifications needed for automotive and telecom deployments.
Availability
SMC3K20CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power system integration requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMC3K20CAHM3_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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh automotive environments and safety-critical industrial systems.
FAQ
What is the breakdown voltage tolerance for SMC3K20CAHM3_A?
The SMC3K20CAHM3_A has a specified breakdown voltage (VBR) range of 22.2 V to 24.5 V at 1.0 mA test current, representing a ±5% tolerance around the nominal 23.35 V midpoint. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in 20 V rail designs.
Is SMC3K20CAHM3_A compatible with lead-free reflow processes?
Yes, SMC3K20CAHM3_A is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the package is rated for a maximum peak reflow temperature of 260 °C (MSL Level 1). No pre-baking is required prior to assembly.
Does SMC3K20CAHM3_A support bidirectional transient suppression on AC signal lines?
Yes, SMC3K20CAHM3_A is inherently bidirectional and requires no polarity marking. It provides symmetrical clamping for both positive and negative transients, making it ideal for protecting AC-coupled interfaces such as RS-485, CAN FD, or audio lines where voltage polarity reverses during normal operation.
How does the clamping performance of SMC3K20CAHM3_A compare under 10/1000 μs versus 8/20 μs waveforms?
At 92.6 A (10/1000 μs), SMC3K20CAHM3_A clamps to 32.4 V; at 701 A (8/20 μs), it clamps to 42.8 V. The higher current 8/20 μs waveform produces greater instantaneous power, resulting in a 32% higher clamping voltage - a critical consideration when designing for lightning-surge immunity per IEC 61000-4-5.
What automotive standards does SMC3K20CAHM3_A meet beyond AEC-Q101?
In addition to AEC-Q101 qualification, SMC3K20CAHM3_A meets ISO 7637-2 (Pulse 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) for automotive electrical disturbances. It also complies with IEC 61000-4-2 (30 kV ESD) and carries UL 497B recognition (E136766) for telecom and industrial safety-critical applications.
SMC3K20CAHM3_A/I 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC3K20CAHM3_A/I FAQ
1.How can I place an order for SMC3K20CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K20CAHM3_A/I 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 SMC3K20CAHM3_A/I reliable?
The price and inventory of SMC3K20CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K20CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMC3K20CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K20CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K20CAHM3_A/I?
SMC3K20CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K20CAHM3_A/I 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 SMC3K20CAHM3_A/I?
For technical support, including SMC3K20CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K20CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K20CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K20CAHM3_A/I 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 SMC3K20CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K20CAHM3_A/I?
All SMC3K20CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K20CAHM3_A/I, 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 SMC3K20CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMC3K20CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K20CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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