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Vishay General Semiconductor - Diodes Division SMC3K20CAHM3_A/H
- Part No.:
- SMC3K20CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K20CAHM3_A/H.pdf
- Description:
- 3KW, 20V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
SMC3K20CAHM3_A 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 3000 W peak pulse power (10/1000 μs), 32.4 V clamping voltage at 701 A peak pulse current, and 20 V stand-off voltage. It protects sensitive ICs and MOSFETs in automotive power electronics against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K20CAHM3_A datasheet, SMC3K20CAHM3_A pinout, SMC3K20CAHM3_A application, or SMC3K20CAHM3_A equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional clamping behavior, 22.2–24.5 V breakdown range, 2.0 μA max reverse leakage at 20 V, and compatibility with 12 V battery system load-dump and inductive-switching transient suppression.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to overvoltage events and diverting surge current away from downstream circuitry. Its low incremental surge resistance ensures minimal voltage overshoot during high-current transients like ISO 7637-2 Pulse 1 (−150 V, 2 ms) and Pulse 2a (112 V, 50 μs).
Designed for automotive-grade reliability, it meets MSL Level 1 per J-STD-020, supports 260 °C reflow peak temperature, and passes IEC 61000-4-2 ESD testing up to ±30 kV (contact/air). Its thermal resistance junction-to-mount is 4.0 °C/W, enabling robust power dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains 701 A surge current without failure under standardized automotive transient waveforms |
| Clamping Voltage VC | 32.4 V at 701 A - limits voltage seen by protected IC/MOSFET to safe level during worst-case surge |
| Stand-off Voltage VWM | 20 V - ensures no conduction during normal 12 V system operation with margin for ripple and tolerance |
| Breakdown Voltage VBR | 22.2–24.5 V at 1 mA - defines precise turn-on threshold for reliable transient detection and clamping |
| Reverse Leakage ID | ≤2.0 μA at 20 V - negligible standby power loss and signal integrity impact on protected lines |
| Operating Temperature | −55 °C to +175 °C - supports under-hood automotive environments and industrial motor control enclosures |
| AEC-Q101 Qualified | Yes - validated for automotive electronic systems requiring zero-defect reliability and extended lifetime |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no polarity marking required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Anode/Cathode terminal (bidirectional) | Both terminals are functionally symmetric; either can serve as anode or cathode depending on transient polarity |
| Anode (unmarked end) | Anode/Cathode terminal (bidirectional) | No functional distinction - device clamps equally for positive or negative surges across the two terminals |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines and dual-polarity power rails without external polarity management |
| 30 kW surge rating (8/20 μs) | Handles high-energy lightning-induced surges per IEC 61000-4-5, supporting telecom and industrial field equipment |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on protected components - critical for 24 V logic interfaces and gate drivers |
| UL 497B recognition (E136766) | Validates safety compliance for telecom and industrial interface protection circuits requiring regulatory certification |
| JESD201 Class 2 whisker resistance | Ensures long-term solder joint integrity in high-reliability applications including automotive body control modules |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V supply inputs to body control modules (BCM), junction boxes, and lighting controllers exposed to load dump and inductive switching. IC Role / Device Role / Timing Role: Shunt TVS device that clamps transients before they reach DC-DC converters and microcontrollers. Use Value: Withstands ISO 16750-2 Pulse b (load dump) up to 101 V, limiting voltage to ≤32.4 V and preventing latch-up or burnout of downstream ICs. |
Use Scenario: Shielding analog and digital sensor outputs (e.g., pressure, temperature, position sensors) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry point to suppress ESD and cable discharge events. Use Value: 30 kV IEC 61000-4-2 ESD immunity and <1 ns response time prevent data corruption or sensor reset during handling or field operation. |
| Telecom Interface Protection | Consumer Power Adapter Inputs |
Use Scenario: Surge protection on Ethernet PHY power rails and auxiliary bias lines in PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Primary front-end TVS for 48 V intermediate bus, coordinating with secondary protection stages. Use Value: 30 kW (8/20 μs) rating absorbs induced surges from nearby lightning strikes per IEC 61000-4-5, preserving PHY IC longevity. |
Use Scenario: Input-stage transient suppression in universal-input AC/DC adapters for smart home hubs and audio equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bridge rectifier to clamp line-to-line and line-to-ground surges. Use Value: 20 V VWM allows stable operation across 12–24 V DC output ranges while clamping 10/1000 μs surges to 32.4 V - well below IC input absolute maximum ratings. |
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 peak pulse power (400 W), SMA package (smaller footprint, higher thermal resistance) | Suitable for lower-energy consumer electronics; not AEC-Q101 qualified or ISO 7637-2 compliant | Select when cost and board space are prioritized over automotive-grade surge robustness |
| 1.5KE20CA | Through-hole DO-201 package, same 20 V VWM but 1500 W rating (10/1000 μs), higher clamping voltage (34.6 V) | Used in legacy industrial power supplies where reworkability and manual assembly are required | Choose only if through-hole mounting is mandatory and 3000 W capability is not needed |
Compared with SMAJ20CA and 1.5KE20CA, SMC3K20CAHM3_A delivers 7.5× higher surge power handling, AEC-Q101 qualification, and tighter clamping-making it the sole choice for new automotive and high-reliability industrial designs requiring ISO-compliant protection.
Availability
SMC3K20CAHM3_A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom infrastructure, and consumer power adapter designs requiring stable component supply, long-lifecycle support, and consistent AEC-Q101 compliance.
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 demanding industrial and automotive applications.
The SMC3KxxCAHM3_A series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for automotive-grade transient suppression in 12 V and 24 V systems meeting ISO 7637-2, ISO 16750-2, and AEC-Q101 requirements.
FAQ
What is the breakdown voltage range 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, measured per ANSI/IEEE C62.35 standards. This tight tolerance ensures predictable clamping onset and consistent protection performance across production lots and temperature extremes from −55 °C to +175 °C.
Is SMC3K20CAHM3_A suitable for 24 V automotive systems?
Yes, SMC3K20CAHM3_A is appropriate for 24 V automotive systems when used on auxiliary or low-power subcircuits with sufficient voltage margin - its 20 V stand-off voltage provides headroom above nominal 24 V rail peaks (typically ≤28 V). For primary 24 V bus protection, higher-VWM variants like SMC3K33CAHM3_A are recommended to avoid leakage or premature conduction.
Does SMC3K20CAHM3_A require orientation during PCB placement?
No - SMC3K20CAHM3_A is a bidirectional TVS diode with symmetrical terminals and no polarity marking. Either end may be connected to the line or ground side of the protected circuit. Its DO-214AB package has identical electrical behavior regardless of orientation, simplifying automated placement and reducing assembly errors.
What is the maximum clamping voltage of SMC3K20CAHM3_A under a 10/1000 μs surge?
The maximum clamping voltage (VC) of SMC3K20CAHM3_A under a 10/1000 μs waveform is 32.4 V at 701 A peak pulse current, as specified in the Vishay datasheet (Document Number: 98241, Rev. 09-Jan-2024). This value is guaranteed across temperature and represents the upper limit of voltage imposed on protected circuitry during worst-case surge conditions.
How does SMC3K20CAHM3_A compare to standard Zener diodes for surge protection?
Unlike standard Zener diodes, SMC3K20CAHM3_A is optimized for transient suppression - featuring lower dynamic impedance, faster response (<1 ns), higher surge current capability (701 A), and AEC-Q101 qualification. Standard Zeners lack defined surge ratings, degrade under repeated transients, and cannot reliably meet ISO 7637-2 Pulse 1 or Load Dump requirements - making SMC3K20CAHM3_A the engineered solution for robust system-level protection.
SMC3K20CAHM3_A/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):
- 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:
- -
- 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/H FAQ
1.How can I place an order for SMC3K20CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K20CAHM3_A/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 SMC3K20CAHM3_A/H reliable?
The price and inventory of SMC3K20CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMC3K20CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K20CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K20CAHM3_A/H?
SMC3K20CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K20CAHM3_A/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 SMC3K20CAHM3_A/H?
For technical support, including SMC3K20CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K20CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K20CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K20CAHM3_A/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 SMC3K20CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K20CAHM3_A/H?
All SMC3K20CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K20CAHM3_A/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 SMC3K20CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K20CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K20CAHM3_A/H Tags
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