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Vishay General Semiconductor - Diodes Division SM8S28-E3/2D
- Part No.:
- SM8S28-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S28-E3/2D.pdf
- Description:
- TVS DIODE 28VWM 50.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,223
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Product details
Overview
SM8S28-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in high-reliability 12 V/24 V systems. It features a 28.0 V stand-off voltage (VWM), 50.1 V maximum clamping voltage (VC) at 132 A peak pulse current (IPPM), and 6600 W peak pulse power (10/1000 μs), operating up to TJ = 175 °C.
For engineers reviewing the SM8S28-E3/2D datasheet, SM8S28-E3/2D pinout, SM8S28-E3/2D application, or SM8S28-E3/2D equivalent, key selection criteria include its AEC-Q101 qualification, DO-218AB package thermal performance (RθJC = 0.90 °C/W), low leakage (<10 μA at VWM), and compliance with ISO7637-2 load dump surge requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability under high-temperature transients. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to PCB copper planes for efficient thermal dissipation during 10 ms exponential load dump events.
The device delivers 5200 W surge capability under 10/10,000 μs waveform and maintains <1.8 V forward voltage at 100 A (8.3 ms half-sine), supporting robust protection of downstream DC-DC converters and microcontrollers in automotive power networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system overvoltage threshold for 24 V nominal automotive circuits. |
| VC @ IPPM | 50.1 V - Clamped voltage at 132 A (10/1000 μs); defines worst-case stress on protected ICs during load dump. |
| PPPM (10/1000 μs) | 6600 W - Peak transient power handling; enables single-device protection against ISO7637-2 Pulse 5a without derating at TC = 25 °C. |
| TJ max. | 175 °C - Maximum junction temperature; supports operation in engine bay environments and validates AEC-Q101 qualification. |
| RθJC | 0.90 °C/W - Junction-to-case thermal resistance; allows accurate thermal design when mounted to heatsinked PCB copper area. |
| IFSM | 700 A - Non-repetitive forward surge rating (8.3 ms); ensures survivability during battery reversal or jump-start events. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with matte tin-plated leads, UL 94 V-0 rated compound, and heatsink terminal (anode) for direct thermal coupling to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into the device during overvoltage events. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical return; must be soldered to large copper pour for effective heat dissipation and low-inductance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
| MSL Level 1 (J-STD-020) | Reflow-compatible up to 245 °C peak without moisture sensitivity concerns; eliminates bake requirements prior to assembly. |
| ISO7637-2 compliant | Meets Pulse 5a (load dump) requirements across full temperature range; verified with 10 ms exponential waveform testing. |
| Low leakage at high TJ | <15 μA at VWM and TJ = 175 °C; prevents excessive quiescent current drain in always-on vehicle modules. |
| Heatsink-anode polarity | Enables low-inductance, high-current return path via PCB copper plane; reduces clamping overshoot during fast transients. |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Input Protection |
|---|---|
Use Scenario: 12 V/24 V vehicle electrical system subjected to alternator load dump transients up to 60 V and 100 ms duration. IC Role / Device Role: Primary clamping device placed at main power input of body control module or infotainment head unit. Use Value: Limits voltage seen by downstream DC-DC regulators to ≤50.1 V, preventing latch-up or permanent damage during ISO7637-2 Pulse 5a events. |
Use Scenario: ECU power rail exposed to switching noise and load dump surges from solenoid drivers and fuel injectors. IC Role / Device Role: Front-end transient suppressor on +5 V or +3.3 V regulator input, upstream of LDOs and microcontrollers. Use Value: Maintains regulated supply integrity by clamping transients before they propagate through filtering stages, reducing need for oversized bulk capacitance. |
| ADAS Camera Power Input Protection | Telematics Control Unit (TCU) Battery Interface |
Use Scenario: 12 V input to automotive camera module operating near engine compartment with ambient TA up to 105 °C. IC Role / Device Role: Unidirectional TVS on main power line, thermally coupled to heatsinked PCB layer. Use Value: Ensures reliable operation at TJ = 175 °C while delivering 6600 W surge capacity-critical for compact, sealed camera housings with limited airflow. |
Use Scenario: TCU connected directly to vehicle battery with wake-up circuitry requiring ultra-low standby leakage. IC Role / Device Role: Standoff-rated protector on battery input, selected for minimal reverse leakage at elevated temperature. Use Value: Delivers <10 μA leakage at 28 V and 25 °C, and <15 μA at 175 °C-preserving battery life in always-connected telematics applications. |
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), SMA package, bidirectional option available, RθJC not specified. | Rated for general industrial use only; not AEC-Q101 qualified or ISO7637-2 verified. | Select when cost-sensitive non-automotive designs require basic 28 V clamping with SMT footprint compatibility. |
| TPSMD28CA | Bi-directional, 6000 W PPPM, DO-218AB package, but VC = 48.4 V at 132 A and no AEC-Q101 documentation found. | Lacks formal automotive qualification; may require additional validation for load dump immunity in production vehicles. | Consider only for prototyping where bidirectional clamping is required and automotive qualification is not mandated. |
Compared with SMAJ28A-E3/5AT and TPSMD28CA, the SM8S28-E3/2D provides higher surge margin (6600 W vs. ≤6000 W), guaranteed AEC-Q101 qualification, and documented ISO7637-2 compliance-making it the only choice for production automotive ECUs requiring zero-risk transient protection.
Availability
SM8S28-E3/2D is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and ADAS camera modules requiring stable component supply and long-term lifecycle support.
Supply support for SM8S28-E3/2D 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SM8S series was engineered specifically for automotive load dump protection, combining high-temperature junction capability (175 °C), DO-218AB thermal efficiency, and AEC-Q101 validation to replace legacy axial-leaded TVS solutions in modern power distribution networks.
FAQ
What is the clamping voltage of the SM8S28-E3/2D at its rated peak pulse current?
The SM8S28-E3/2D has a maximum clamping voltage (VC) of 50.1 V when subjected to its rated 132 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM8S28-E3/2D maintains this clamping performance across its full operating temperature range.
Is the SM8S28-E3/2D qualified for automotive applications?
Yes, the SM8S28-E3/2D is AEC-Q101 qualified and explicitly validated for automotive use. It meets ISO7637-2 load dump surge requirements and is rated for continuous operation at junction temperatures up to 175 °C. The DO-218AB package also complies with MSL Level 1 per J-STD-020, ensuring robustness during lead-free reflow assembly. These qualifications are documented in Vishay's official specification sheet 88387 for the SM8S28-E3/2D.
What is the thermal resistance from junction to case for the SM8S28-E3/2D?
The SM8S28-E3/2D has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W, measured under standard test conditions. This low value is enabled by the DO-218AB package's metal heatsink terminal (anode), which must be soldered to a substantial PCB copper area to realize full thermal performance. Accurate thermal modeling of the SM8S28-E3/2D requires using this RθJC value in conjunction with board-level thermal resistance estimates.
Does the SM8S28-E3/2D meet RoHS and halogen-free requirements?
Yes, the SM8S28-E3/2D is RoHS-compliant per Directive 2011/65/EU and halogen-free per JEDEC JS709A standards. The "E3" suffix denotes matte tin plating and RoHS compliance, while the molding compound meets UL 94 V-0 flammability rating. Vishay confirms full conformance in its Material Category Policy documentation, and the SM8S28-E3/2D carries no exemptions under current regulatory frameworks.
How does the SM8S28-E3/2D differ from the SM8S28A variant?
The SM8S28-E3/2D is the standard unidirectional version with breakdown voltage (VBR) ranging from 31.1 V to 38.0 V, while the SM8S28A variant has a tighter VBR range of 31.1 V to 34.4 V and lower clamping voltage (45.4 V at 145 A). The SM8S28-E3/2D offers higher surge current rating (132 A vs. 145 A) but slightly higher clamping. Both share identical package, AEC-Q101 qualification, and thermal specs-selection depends on system tolerance for clamping voltage versus required margin above VWM.
SM8S28-E3/2D 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):
- 132A
- Power - Peak Pulse:
- 6600W (6.6kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM8S28-E3/2D FAQ
1.How can I place an order for SM8S28-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S28-E3/2D 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 SM8S28-E3/2D reliable?
The price and inventory of SM8S28-E3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S28-E3/2D is usually 5 days.
3.What payment methods are accepted for SM8S28-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S28-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S28-E3/2D?
SM8S28-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S28-E3/2D 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 SM8S28-E3/2D?
For technical support, including SM8S28-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S28-E3/2D requirements.
6.How does Aetrix verify that SM8S28-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S28-E3/2D 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 SM8S28-E3/2D meets industry standards.
7.What is the process for return or replacement of SM8S28-E3/2D?
All SM8S28-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S28-E3/2D, 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 SM8S28-E3/2D part is unused and in its original packaging.
Return procedure for SM8S28-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S28-E3/2D Tags
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