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Vishay General Semiconductor - Diodes Division SMC3K28CAHM3_A/I
- Part No.:
- SMC3K28CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K28CAHM3_A/I.pdf
- Description:
- 3KW, 28V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,064
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Product details
Overview
SMC3K28CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. 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 - enabling use in automotive power line and sensor interface protection.
For engineers reviewing the SMC3K28CAHM3_A datasheet, SMC3K28CAHM3_A pinout, SMC3K28CAHM3_A application, or SMC3K28CAHM3_A equivalent, key selection criteria include its bidirectional clamping behavior, ISO 7637-2 Pulse 1/2a/3a/3b compliance, 30 kV ESD immunity per IEC 61000-4-2, and thermal resistance of 90 °C/W (junction-to-ambient) under JEDEC 51-2A mounting conditions.
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 transient energy from inductive switching, load dump, and lightning-induced surges. Its bidirectional architecture allows symmetric clamping on both polarities without polarity marking.
The device meets stringent automotive reliability requirements: AEC-Q101 qualified, MSL Level 1 (260 °C reflow), halogen-free, RoHS-compliant, and UL 497B recognized (E136766). Thermal performance is characterized by RthJA = 90 °C/W and RthJM = 4.0 °C/W, supporting stable operation up to TJ = +175 °C.
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 clamping initiates reliably |
| Stand-off Voltage VWM | 28 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| Clamping Voltage VC | 45.4 V at 66.1 A (10/1000 μs) - limits downstream voltage during surge, protecting 3.3 V/5 V/12 V ICs |
| Peak Pulse Power PPPM | 3000 W (10/1000 μs) - sustains high-energy transients typical in automotive ISO 7637-2 Pulse 1 and Pulse 2a |
| ESD Withstand | ±30 kV per IEC 61000-4-2 (contact/air) - eliminates need for additional ESD front-end protection |
| Operating Temperature | −55 °C to +175 °C - supports under-hood and industrial environments without derating |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards; polarity not marked due to bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge current return path | Both terminals are electrically symmetrical; either may connect to protected line or ground - no polarity dependency |
| Anode (Cathode) | Surge current return path | Identical role to opposite terminal; enables flexible PCB layout without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 3000 W peak pulse power (10/1000 μs) | Withstands automotive load dump and ISO 7637-2 Pulse 1 (−150 V, 2 ms) without failure |
| AEC-Q101 qualification | Validated for automotive powertrain, body control, and ADAS modules requiring zero-defect reliability |
| UL 497B recognition (E136766) | Meets safety agency requirements for primary-side surge protection in industrial and telecom equipment |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking, reducing manufacturing cost and cycle time |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (load dump). IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and ground, clamping transients within nanoseconds. Use Value: Limits voltage to ≤45.4 V during 66.1 A surge, preventing latch-up or gate oxide damage in MCU and CAN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation systems exposed to motor drive noise. IC Role / Device Role / Timing Role: Bidirectional clamp on differential or single-ended signal lines, suppressing EFT bursts and ESD events. Use Value: Maintains signal integrity below ±40 V clamping level while adding <1 pF junction capacitance at zero bias. |
| Telecom DC Power Input | Consumer USB-C Port Protection |
Use Scenario: Securing 48 V PoE-powered network switches against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-stage TVS on DC input rail, absorbing up to 30 kW (8/20 μs) per UL 497B-certified design. Use Value: Survives repeated 30 kV contact-mode ESD strikes without parameter shift, ensuring long-term field reliability. |
Use Scenario: Overvoltage guard for USB-C CC and VBUS lines in portable devices subjected to accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp limiting VBUS to ≤45.4 V during fault conditions. Use Value: Prevents damage to USB PD controllers and port multiplexers while maintaining <1 μA leakage at 28 V standby. |
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 | Same VWM (28 V), lower PPPM (400 W), SMA package (smaller footprint, higher RthJA = 150 °C/W) | Limited to low-energy consumer interfaces; insufficient for ISO 7637-2 Pulse 1 | Select when space-constrained and surge energy ≤400 W; verify thermal margin at 125 °C ambient |
| SMCJ28CA | Same package and VWM, but 1500 W PPPM (half rating), non-AEC-Q101, no UL recognition | Acceptable for industrial non-automotive use where certification is not mandated | Choose for cost-sensitive non-automotive designs; avoid where AEC-Q101 or UL 497B is required |
Compared with SMAJ28CA and SMCJ28CA, SMC3K28CAHM3_A delivers 2× higher peak power than SMCJ28CA and 7.5× more than SMAJ28CA, while providing automotive-grade qualification and safety certification essential for mission-critical protection.
Availability
SMC3K28CAHM3_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 across multi-year production cycles.
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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMC3Kx series is engineered specifically for high-energy transient suppression in harsh environments, with emphasis on AEC-Q101 compliance, ISO 7637-2 immunity, and UL safety certification for automotive and industrial power systems.
FAQ
What is the clamping voltage of SMC3K28CAHM3_A at 66.1 A?
The SMC3K28CAHM3_A clamps to 45.4 V at 66.1 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream ICs see no more than 45.4 V during surge events - critical for protecting 3.3 V, 5 V, and 12 V logic and interface circuits. The clamping voltage remains stable across temperature and lifetime when operated within rated conditions.
Is SMC3K28CAHM3_A suitable for automotive applications?
Yes, SMC3K28CAHM3_A is AEC-Q101 qualified and tested to ISO 7637-2 Pulse 1, 2a, 3a, and 3b, as well as ISO 16750-2 Pulse b. Its 175 °C max junction temperature, MSL Level 1 rating, and UL 497B recognition make it appropriate for engine control units, body electronics, and ADAS modules. The SMC3K28CAHM3_A data sheet confirms full compliance with automotive stress-test protocols.
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 meeting J-STD-002 solderability and JESD 22-B102 whisker resistance (Class 2). It also signifies AEC-Q101 qualification and UL 497B safety recognition. This suffix distinguishes the SMC3K28CAHM3_A from legacy variants lacking these certifications and environmental attributes.
How does SMC3K28CAHM3_A compare to unidirectional TVS diodes?
SMC3K28CAHM3_A provides symmetrical clamping for both positive and negative transients, eliminating the need to determine signal polarity during layout - unlike unidirectional TVS diodes that require correct anode/cathode orientation. Its bidirectional structure simplifies design for AC-coupled lines, differential buses, and floating sensors, while maintaining identical VBR, VC, and PPPM specs in both directions.
What is the thermal resistance of SMC3K28CAHM3_A under standard mounting?
Under JEDEC 51-2A conditions (FR4 PCB, 2 oz copper, standard footprint), SMC3K28CAHM3_A has a junction-to-ambient thermal resistance (RthJA) of 90 °C/W. Its junction-to-mount (RthJM) is 4.0 °C/W, enabling efficient heat transfer to thermal pads or heatsinks. These values are confirmed in the Vishay datasheet revision 09-Jan-2024 and directly impact sustained surge handling capability at elevated ambient temperatures.
SMC3K28CAHM3_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):
- 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/I FAQ
1.How can I place an order for SMC3K28CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K28CAHM3_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 SMC3K28CAHM3_A/I reliable?
The price and inventory of SMC3K28CAHM3_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 SMC3K28CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMC3K28CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K28CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K28CAHM3_A/I?
SMC3K28CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K28CAHM3_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 SMC3K28CAHM3_A/I?
For technical support, including SMC3K28CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K28CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K28CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K28CAHM3_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 SMC3K28CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K28CAHM3_A/I?
All SMC3K28CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K28CAHM3_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 SMC3K28CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMC3K28CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K28CAHM3_A/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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