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Vishay General Semiconductor - Diodes Division SMC3K28CAHM3/9A
- Part No.:
- SMC3K28CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K28CAHM3/9A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,335
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Product details
Overview
SMC3K28CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 31.1–34.4 V breakdown voltage, and 45.4 V maximum clamping voltage at 66.1 A surge current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial systems against inductive switching transients.
For engineers reviewing the SMC3K28CAHM3/9A datasheet, SMC3K28CAHM3/9A pinout, SMC3K28CAHM3/9A application, or SMC3K28CAHM3/9A equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, halogen-free RoHS-compliant construction, and compatibility with wave-soldering restrictions on PCB bottom side mounting.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by transient overvoltage events. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity orientation, and its low incremental surge resistance ensures stable clamping performance under repetitive 10/1000 μs surges up to 3000 W.
The SMC3K28CAHM3/9A features a 28 V stand-off voltage and 2.0 μA max reverse leakage at that voltage, enabling reliable operation in high-impedance signal paths. Its AEC-Q101 qualification confirms suitability for automotive electronics, while MSL Level 1 rating and 260 °C lead-free reflow compatibility support automated assembly in industrial production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000 W (10/1000 μs waveform) - sustains high-energy transients without failure in motor drive or power supply protection |
| Breakdown Voltage VBR | 31.1–34.4 V at 1.0 mA - defines precise voltage threshold where clamping initiates |
| Stand-off Voltage VWM | 28 V - maximum continuous reverse operating voltage before leakage exceeds 2.0 μA |
| Clamping Voltage VC | 45.4 V at 66.1 A IPPM - limits downstream voltage stress during worst-case surge |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in under-hood automotive and industrial ambient conditions |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad area for thermal dissipation |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling and humidity testing |
Pinout & Package
SMC3K28CAHM3/9A uses the SMC (DO-214AB) package: molded plastic case with two coplanar matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Bidirectional polarity means no cathode marking; terminals are non-polarized and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (non-polarized) | Transient conduction path | Both terminals serve identical clamping function; no directional installation required |
| Cathode/Anode (non-polarized) | Transient conduction path | Identical to first terminal - symmetric bidirectional operation eliminates orientation dependency |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional polarity only | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 3000 W peak pulse power (10/1000 μs) | Handles high-energy transients common in automotive load-dump and inductive switch-off events |
| AEC-Q101 qualification | Validates robustness for automotive ECUs, body control modules, and ADAS sensor interfaces |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity handling requirements |
| Halogen-free, RoHS-compliant HM3 suffix | Meets automotive environmental compliance mandates and whisker-resistant plating per JESD 201 Class 2 |
Applications
| Automotive Body Control Module | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs from load-dump and inductive kickback in vehicle door modules. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly across protected signal line and ground. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to 3.3 V/5 V transceivers and ensuring functional safety compliance. |
Use Scenario: Safeguarding gate drivers and feedback sensing lines in variable-frequency drives exposed to IGBT switching noise. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing surge energy before it reaches sensitive analog front-ends. Use Value: Clamps 66.1 A surges within nanoseconds, maintaining signal integrity in current-sense amplifier inputs. |
| Consumer Appliance Power Supply | Telecom Base Station Sensor Interface |
Use Scenario: Shielding microcontroller I/O pins and optocoupler inputs from ESD and relay bounce in washing machine control boards. IC Role / Device Role / Timing Role: Standby-mode protector with 2.0 μA leakage at 28 V, minimizing quiescent current impact. Use Value: Maintains low-power sleep mode integrity while delivering 3000 W surge immunity during mains-connected operation. |
Use Scenario: Guarding RS-485 transceiver inputs and temperature/humidity sensor lines in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Bidirectional clamp on differential data lines, compatible with ±12 V common-mode range. Use Value: Symmetric clamping prevents signal inversion or latch-up during lightning-induced surges on long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K28CAHM3_A/9A | Same electrical specs; updated revision with enhanced traceability and updated packaging documentation | Identical use cases; intended as direct replacement per Vishay's "Not for New Designs" notice | Select when sourcing latest-revision documentation and extended lifecycle support is required |
| SMC3K30CAHM3/9A | Higher VBR (33.3–36.8 V) and VWM (30 V); same 3000 W rating and SMC package | Better suited for 3.3 V logic with higher margin above 28 V rail; slightly reduced clamping headroom | Choose for designs requiring tighter tolerance around 30 V nominal supply or improved noise immunity |
Compared with SMC3K28CAHM3/9A, the SMC3K28CAHM3_A/9A offers identical protection performance with updated manufacturing traceability, while SMC3K30CAHM3/9A trades 2 V higher stand-off for marginally increased clamping voltage-critical when protecting 30 V-rated interface ICs.
Availability
SMC3K28CAHM3/9A is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and telecom infrastructure requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for SMC3K28CAHM3/9A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMC3KxxCAHM3 series was engineered for automotive and industrial transient suppression, combining high-power capability, AEC-Q101 qualification, and halogen-free packaging to meet stringent environmental and safety requirements.
FAQ
What does the 'HM3' suffix mean in SMC3K28CAHM3/9A?
The HM3 suffix in SMC3K28CAHM3/9A indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this automotive-grade variant from commercial-grade M3 versions and confirms compliance with automotive reliability and environmental standards.
Is SMC3K28CAHM3/9A suitable for new automotive designs?
No-Vishay explicitly designates SMC3K28CAHM3/9A as "Not for New Designs." New automotive projects should use the updated SMC3K28CAHM3_A/9A variant, which carries the same electrical specifications but reflects the latest revision, documentation, and traceability enhancements per Vishay Document 89433.
What is the maximum clamping voltage of SMC3K28CAHM3/9A at rated surge current?
The SMC3K28CAHM3/9A has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 66.1 A using the 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMC3K28CAHM3/9A be used in bidirectional signal lines like RS-485?
Yes-SMC3K28CAHM3/9A is inherently bidirectional and requires no polarity orientation, making it ideal for protecting differential buses such as RS-485. Its symmetrical clamping behavior ensures equal protection on both signal lines without introducing DC bias or signal distortion.
What is the thermal pad layout recommendation for SMC3K28CAHM3/9A?
Vishay specifies a 0.305" × 0.305" (8.0 mm × 8.0 mm) copper pad area for optimal thermal dissipation of SMC3K28CAHM3/9A. This layout supports sustained power handling and aligns with JEDEC-standard SMC (DO-214AB) footprint guidelines to maintain junction temperature below 150 °C under repeated surge conditions.
SMC3K28CAHM3/9A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K28CAHM3/9A FAQ
1.How can I place an order for SMC3K28CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K28CAHM3/9A 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 SMC3K28CAHM3/9A reliable?
The price and inventory of SMC3K28CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K28CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K28CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K28CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K28CAHM3/9A?
SMC3K28CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K28CAHM3/9A 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 SMC3K28CAHM3/9A?
For technical support, including SMC3K28CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K28CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K28CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K28CAHM3/9A 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 SMC3K28CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K28CAHM3/9A?
All SMC3K28CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K28CAHM3/9A, 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 SMC3K28CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K28CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K28CAHM3/9A Tags
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