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Vishay General Semiconductor - Diodes Division SMC3K28CAHM3_A/H
- Part No.:
- SMC3K28CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K28CAHM3_A/H.pdf
- Description:
- 3KW, 28V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,520
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Product details
Overview
SMC3K28CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive and industrial electronics protection. It features a 31.1–34.4 V breakdown voltage (VBR), 28 V stand-off voltage (VWM), 45.4 V clamping voltage at 66.1 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed to safeguard MOSFETs and sensor signal lines against ISO 7637-2 Pulse 1/2a/3a/3b transients.
For engineers reviewing the SMC3K28CAHM3_A datasheet, SMC3K28CAHM3_A pinout, SMC3K28CAHM3_A application, or SMC3K28CAHM3_A equivalent, key selection considerations include its bidirectional clamping behavior, 175 °C max junction temperature, 1.0 μA reverse leakage at VWM, compliance with IEC 61000-4-2 (±30 kV ESD), and suitability for 12 V battery system load-dump protection per ISO 16750-2 Pulse B.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector with fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of high-energy transients without device failure. Its bidirectional architecture allows symmetric clamping on both polarities, supporting robust protection in unidirectional DC systems where reverse polarity events may occur.
The device meets AEC-Q101 stress testing requirements and UL 497B safety recognition (E136766), with thermal resistance RthJA = 90 °C/W and RthJM = 4.0 °C/W - confirming suitability for high-reliability automotive PCB layouts using standard FR4 with 2 oz copper. It is halogen-free, RoHS-compliant, and qualified to MSL level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 31.1–34.4 V at 1.0 mA test current - defines minimum voltage at which device enters avalanche conduction, ensuring reliable triggering above normal operating voltage. |
| Stand-off Voltage VWM | 28 V - maximum continuous reverse working voltage before significant leakage; sets safe margin below system nominal voltage (e.g., 24 V rail). |
| Clamping Voltage VC | 45.4 V at 66.1 A (10/1000 μs) - actual voltage seen by protected circuit during surge; determines maximum stress on downstream ICs or MOSFETs. |
| Peak Pulse Power | 3000 W (10/1000 μs) - energy-handling capability under standardized surge waveform; enables protection against ISO 7637-2 Pulse 1 (−150 V, 2 ms). |
| ESD Withstand | ±30 kV (IEC 61000-4-2, contact & air discharge) - ensures immunity to human-body-model electrostatic events in assembly and field environments. |
| Junction Temperature Range | −55 to +175 °C - supports operation in under-hood automotive locations and industrial enclosures without derating up to max rating. |
| Leakage Current ID | 1.0 μA at VWM - minimal standby power loss and negligible impact on high-impedance sensor bias networks. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, halogen-free, RoHS-compliant, MSL level 1 (260 °C peak reflow). Dimensions: 7.11 × 6.22 × 2.62 mm (L × W × H); cathode band not marked on bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient current sink (negative polarity) | Provides low-impedance path to ground during negative transients; identical electrical role to cathode due to bidirectional symmetry. |
| Cathode (Non-Band Side) | Transient current sink (positive polarity) | Provides low-impedance path to ground during positive transients; functionally interchangeable with anode in this bidirectional device. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of DC lines against both positive and negative transients without polarity-sensitive placement. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| 30 kW surge rating (8/20 μs) | Supports high-current lightning-induced surges per IEC 61000-4-5, extending protection beyond ISO 7637-2 to telecom-grade threats. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage stress on protected components - critical for 3.3 V or 5 V logic interfacing with 24 V supply domains. |
| UL 497B recognition (E136766) | Confirms compliance with safety standards for transient protectors used in telecom, industrial, and automotive signal line applications. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting analog outputs and CAN/LIN bus lines of wheel speed, pressure, and temperature sensors in 12 V/24 V vehicle architectures. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector interface to clamp ISO 7637-2 Pulse 3a/3b (±150 V, 150 ns) and Pulse 2a (112 V, 50 μs). Use Value: Limits voltage excursion to ≤40 V during transients, preventing latch-up or gate oxide damage in downstream op-amps and microcontrollers. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Bidirectional TVS mounted at terminal block entry point to absorb repetitive 1 kV/μs surges per IEC 61000-4-4. Use Value: Maintains signal integrity with <1 μA leakage at 24 V DC, avoiding false triggering while surviving >5000 pulses per ISO 7637-2 test profile. |
| Automotive Load Dump Suppression | Telecom DC Power Interface Protection |
Use Scenario: Mitigating 101 V, 400 ms load dump events in alternator-regulated 12 V systems per ISO 16750-2 Pulse B. IC Role / Device Role / Timing Role: Primary clamping element across battery rail, coordinated with upstream fuses and secondary TVS arrays. Use Value: Clamps peak voltage to ≤38 V (Pulse B, 101 V US), reducing stress on 40 V-rated power management ICs and enabling smaller input capacitors. |
Use Scenario: Protecting PoE-powered Ethernet ports and DC-fed base station radios against induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Front-end TVS on 48 V DC input stage, meeting IEC 61000-4-5 (8/20 μs, 30 kW) immunity requirements. Use Value: Delivers 498 A peak surge current handling (8/20 μs) with <2.0 Ω dynamic impedance, limiting let-through energy to <10 mJ per event. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA | Lower peak pulse power (400 W vs. 3000 W); SMA package (smaller footprint, higher RthJA = 110 °C/W); same VWM/VBR range. | Not suitable for ISO 7637-2 Pulse 1 or load dump; limited to low-energy ESD and EFT events in consumer electronics. | Select only when space-constrained and surge energy is <100 mJ; verify thermal margin under repeated 10/1000 μs pulses. |
| SMCJ28CA | Same SMC package and 3000 W rating, but non-AEC-Q101; VBR min/max tighter (31.7–34.9 V); no UL 497B recognition. | Lacks automotive qualification and safety certification - acceptable for industrial controls but not OEM automotive designs. | Use where AEC-Q101 and UL recognition are not mandated; offers identical clamping performance and thermal behavior. |
Compared with SMC3K28CAHM3_A, SMAJ28CA provides compact size at the cost of 7.5× lower surge energy handling and no automotive qualification, while SMCJ28CA matches mechanical and electrical specs but omits AEC-Q101 and UL safety listing - making SMC3K28CAHM3_A the sole choice for certified automotive front-end protection.
Availability
SMC3K28CAHM3_A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power interfaces, and sensor modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMC3K28CAHM3_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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping voltage, high surge robustness, and zero-maintenance reliability.
FAQ
What is the clamping voltage of SMC3K28CAHM3_A under a 10/1000 μs surge?
The SMC3K28CAHM3_A clamps to 45.4 V at 66.1 A under a 10/1000 μs waveform, as specified in the Electrical Characteristics table. This value represents the maximum voltage imposed on the protected circuit during standardized surge testing and is measured at the device terminals with proper layout and grounding per JEDEC 51-2A.
Is SMC3K28CAHM3_A qualified for automotive use?
Yes, SMC3K28CAHM3_A is AEC-Q101 qualified and rated for operation from −55 °C to +175 °C, making it suitable for under-hood and chassis-mounted automotive applications. It also meets ISO 7637-2 and ISO 16750-2 immunity requirements, and carries UL 497B safety recognition (file E136766).
What does the 'HM3_A' suffix indicate in SMC3K28CAHM3_A?
The 'HM3_A' suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. The 'HM3' portion confirms compliance with JESD 201 Class 2 whisker resistance, and '_A' indicates tape-and-reel packaging per Vishay's ordering convention.
Can SMC3K28CAHM3_A be used for bidirectional signal line protection?
Yes, SMC3K28CAHM3_A is explicitly bidirectional and has symmetrical clamping characteristics - verified by identical clamping voltages for positive and negative transients (e.g., −38 V / +38 V for ISO 7637-2 Pulse 1). No polarity marking is present, simplifying layout for differential or AC-coupled signal paths.
What is the thermal resistance of SMC3K28CAHM3_A?
The SMC3K28CAHM3_A has a junction-to-ambient thermal resistance (RthJA) of 90 °C/W and junction-to-mount (RthJM) of 4.0 °C/W, measured per JEDEC 51-2A and 51-14 respectively on standard FR4 with 2 oz copper. These values enable reliable operation at full 3000 W rating with adequate PCB copper area.
SMC3K28CAHM3_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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC3K28CAHM3_A/H FAQ
1.How can I place an order for SMC3K28CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K28CAHM3_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 SMC3K28CAHM3_A/H reliable?
The price and inventory of SMC3K28CAHM3_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 SMC3K28CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K28CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K28CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K28CAHM3_A/H?
SMC3K28CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K28CAHM3_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 SMC3K28CAHM3_A/H?
For technical support, including SMC3K28CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K28CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K28CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K28CAHM3_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 SMC3K28CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K28CAHM3_A/H?
All SMC3K28CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K28CAHM3_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 SMC3K28CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K28CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K28CAHM3_A/H Tags
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