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Vishay General Semiconductor - Diodes Division SM6S28HE3/2D
- Part No.:
- SM6S28HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM6S28HE3/2D.pdf
- Description:
- TVS DIODE 28VWM 50.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,237
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Product details
Overview
SM6S28HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection. It features a 28 V stand-off voltage (VWM), 31.1–38.0 V breakdown range (VBR), 50.1 V clamping voltage at 92 A peak pulse current, 4600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SM6S28HE3/2D datasheet, SM6S28HE3/2D pinout, SM6S28HE3/2D application, or SM6S28HE3/2D equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where junction temperature up to 175 °C, low leakage (<10 µA at VWM), and ISO7637-2 compliance are required.
Technical Context
The SM6S28HE3/2D operates as a unidirectional clamping TVS diode with anode-connected heatsink configuration in DO-218AB package. Its junction passivation and anisotropic rectifier technology enable stable performance at TJ = 175 °C and low forward voltage drop (≤1.9 V at 100 A).
It delivers 4600 W surge capability under 10/1000 µs waveform and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak. The device is rated for 600 A non-repetitive forward surge (8.3 ms half-sine) and exhibits 0.95 °C/W thermal resistance (junction-to-case).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 31.1 V / 38.0 V - Breakdown voltage range at 5 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 50.1 V - Clamping voltage at 92 A peak pulse current; determines protected circuit's maximum transient stress |
| PPPM (10/1000 µs) | 4600 W - Peak surge power handling; supports severe automotive load dump transients |
| TJ max. | 175 °C - Maximum junction temperature; enables placement near hot engine compartments |
| ID @ VWM | <10 µA - Reverse leakage at stand-off voltage; minimizes standby power loss in battery-sensitive systems |
| RθJC | 0.95 °C/W - Junction-to-case thermal resistance; allows effective heat transfer to PCB copper or heatsink |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-heatsink configuration with matte tin-plated leads, UL 94 V-0 molding compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to protected line (e.g., battery rail); must be routed to low-inductance ground path via heatsink |
| Lead 2 / Metal Heatsink | Cathode | Primary thermal and electrical return path; requires ≥100 mm² copper pour for 4600 W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| 175 °C junction rating | Enables direct mounting on high-temperature PCB areas without derating in engine control units or body modules |
| ISO7637-2 compliant | Withstands load dump pulses (Pulse 5a/b) up to 110 V for 400 ms without degradation |
| MSL Level 1 | Zero moisture sensitivity; supports standard 245 °C lead-free reflow without pre-bake |
| Low VF (≤1.9 V) | Reduces conduction losses during forward-biased surge events, minimizing thermal stress during repeated transients |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting ECUs, infotainment, and ADAS modules from alternator-induced load dump transients in vehicles with 12 V or 24 V battery systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ground, clamping surges above 28 V. Use Value: Limits transient voltage to ≤50.1 V at 92 A, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding power inputs of telematics control units and gateway modules exposed to ISO7637-2 Pulse 5a (load dump) and Pulse 1 (inductive switch-off). IC Role / Device Role / Timing Role: Primary overvoltage clamp on main supply input, activated within nanoseconds of transient onset. Use Value: Delivers 4600 W peak power handling and 175 °C operation, eliminating need for parallel devices in compact layouts. |
| Under-Hood Electronics Protection | Industrial Vehicle Power Management |
Use Scenario: Shielding sensors and actuators mounted near engines or exhaust systems where ambient temperatures exceed 125 °C. IC Role / Device Role / Timing Role: High-temperature-rated TVS suppressing ESD and switching spikes on signal or power lines. Use Value: Maintains <10 µA leakage and stable VBR up to 175 °C junction, ensuring long-term reliability without parameter drift. | Use Scenario: Securing power inputs of battery management systems and motor controllers in construction, agricultural, and mining equipment. IC Role / Device Role / Timing Role: Robust front-end protection against generator surges, cable discharge events, and field wiring faults. Use Value: Supports 600 A single-pulse surge (8.3 ms) and meets MSL Level 1, enabling automated SMT assembly and field durability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5AT | Lower PPPM (400 W vs. 4600 W); SMA package; bidirectional option available | Not suitable for load dump; limited to ESD and lower-energy transients | Select only for board-level ESD protection where surge energy is <10% of SM6S28HE3/2D capability |
| 1.5KE28A | Through-hole DO-201 package; same VWM/VBR but lower IPPM (128 A vs. 92 A) and PPPM (3600 W) | Requires manual insertion or wave soldering; unsuitable for high-density automotive PCBs | Consider only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMAJ28A-E3/5AT and 1.5KE28A, the SM6S28HE3/2D offers 11.5× higher surge power, surface-mount DO-218AB packaging optimized for thermal dissipation, and AEC-Q101 qualification-making it the sole choice for production automotive load dump protection.
Availability
SM6S28HE3/2D is available at Aetrix Electronics and suitable for automotive electronic control units, battery management systems, and industrial vehicle power rails requiring stable component supply, AEC-Q101 compliance, and high-temperature surge resilience.
Supply support for SM6S28HE3/2D 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 TVS devices with emphasis on reliability, thermal performance, and automotive qualification.
The SM6S series is part of Vishay's PAR® (Protection Against Transients) platform, engineered specifically for high-energy automotive load dump and ISO7637-2 transient suppression in space-constrained, high-temperature environments.
FAQ
What is the clamping voltage of the SM6S28HE3/2D at its rated peak pulse current?
The SM6S28HE3/2D has a maximum clamping voltage (VC) of 50.1 V at its specified peak pulse current (IPPM) of 92 A under a 10/1000 µs waveform. This value is measured per the conditions defined in the Vishay datasheet (Document Number: 88384) and ensures protected circuits remain below critical overvoltage thresholds during load dump events. The SM6S28HE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM6S28HE3/2D suitable for bidirectional transient protection?
No, the SM6S28HE3/2D is a unidirectional TVS diode, as confirmed by Vishay's datasheet and mechanical marking (anode connected to heatsink). It provides clamping only for positive transients on the anode side relative to cathode. For bidirectional protection, a separate device such as the SM6S28AHE3/2D (A-suffix variant) must be selected. The SM6S28HE3/2D is not interchangeable with bidirectional versions due to polarity and breakdown symmetry differences.
What does the 'HE3/2D' suffix indicate in SM6S28HE3/2D?
The 'HE3' suffix denotes RoHS-compliant, AEC-Q101-qualified construction with JESD201 Class 2 whisker resistance, while '/2D' specifies the preferred packaging: 13-inch plastic tape and reel with 750 units per reel and anode oriented toward the sprocket hole. This packaging format ensures compatibility with high-speed pick-and-place equipment and supports automated SMT assembly for automotive production. The SM6S28HE3/2D is shipped in this exact configuration.
How does the SM6S28HE3/2D perform at elevated junction temperatures?
The SM6S28HE3/2D is characterized for operation up to 175 °C junction temperature, with leakage current remaining below 15 µA at TJ = 175 °C and VWM = 28 V. Its thermal resistance (RθJC = 0.95 °C/W) enables efficient heat transfer to the PCB heatsink pad. Derating curves in the Vishay datasheet confirm stable clamping and breakdown parameters across the full -55 °C to +175 °C range, making the SM6S28HE3/2D appropriate for under-hood deployment.
Does the SM6S28HE3/2D meet ISO7637-2 requirements out-of-the-box?
Yes, the SM6S28HE3/2D is explicitly stated in the Vishay datasheet to meet ISO7637-2 surge specifications under defined test conditions-including Pulse 5a (load dump) with 10 ms exponential waveform. Its 4600 W peak pulse power rating and 50.1 V clamping voltage ensure compliance when implemented with proper PCB layout (e.g., low-inductance grounding, adequate copper area). No external components are needed for basic ISO7637-2 conformance, though system-level validation remains the customer's responsibility per Vishay's disclaimer.
SM6S28HE3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50.1V
- Current - Peak Pulse (10/1000µs):
- 92A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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-218AB
SM6S28HE3/2D FAQ
1.How can I place an order for SM6S28HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S28HE3/2D 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 SM6S28HE3/2D reliable?
The price and inventory of SM6S28HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S28HE3/2D is usually 5 days.
3.What payment methods are accepted for SM6S28HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S28HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S28HE3/2D?
SM6S28HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S28HE3/2D 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 SM6S28HE3/2D?
For technical support, including SM6S28HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S28HE3/2D requirements.
6.How does Aetrix verify that SM6S28HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM6S28HE3/2D 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 SM6S28HE3/2D meets industry standards.
7.What is the process for return or replacement of SM6S28HE3/2D?
All SM6S28HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM6S28HE3/2D, 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 SM6S28HE3/2D part is unused and in its original packaging.
Return procedure for SM6S28HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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