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Vishay General Semiconductor - Diodes Division SM5S28HE3/2D
- Part No.:
- SM5S28HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S28HE3/2D.pdf
- Description:
- TVS DIODE 28VWM 50.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,390
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Product details
Overview
SM5S28HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in 28 V systems. It features a 28.0 V stand-off voltage (VWM), 31.1–38.0 V breakdown range (VBR), 50.1 V clamping voltage at 72 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S28HE3/2D datasheet, SM5S28HE3/2D pinout, SM5S28HE3/2D application, or SM5S28HE3/2D equivalent, key selection criteria include its DO-218AB package thermal resistance (RθJC = 1.0 °C/W), 175 °C junction rating, uni-directional polarity with heatsink-as-anode configuration, and compliance with ISO7637-2 load dump waveforms.
Technical Context
This TVS diode operates as a clamping device in series with the power rail, conducting only when reverse voltage exceeds VBR to limit transients to ≤50.1 V. Its passivated anisotropic rectifier structure enables low leakage (<10 μA at VWM) and low forward voltage drop (≤2.0 V at 100 A).
Rated for 5 W steady-state dissipation on infinite heatsink and capable of 500 A non-repetitive surge (8.3 ms half-sine), it supports high-reliability automotive environments where thermal stability up to TJ = 175 °C and MSL Level 1 moisture sensitivity are required.
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 at 5 mA - Ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPPM | 50.1 V at 72 A (10/1000 μs) - Limits worst-case transient voltage seen by downstream ICs |
| PPPM | 3600 W (10/1000 μs) - Handles severe ISO7637-2 load dump surges without failure |
| TJ max | 175 °C - Enables placement near hot engine control units without derating concerns |
| RθJC | 1.0 °C/W - Allows effective heat transfer to PCB copper or external heatsink |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-connected metal heatsink case with matte tin-plated leads; meets UL 94 V-0, JESD201 Class 2 whisker resistance, and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit's positive rail; carries clamped surge current to ground path |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to large copper pour or external heatsink; primary thermal and electrical return path |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier technology ensures stable VBR over lifetime and temperature |
| High-temperature operation | Rated for continuous use at TJ = 175 °C - eliminates thermal derating in engine bay layouts |
| Low leakage | <10 μA at 28 V and 25 °C - prevents battery drain in always-on vehicle modules |
| ISO7637-2 compliance | Validated against load dump test conditions - reduces need for additional system-level validation |
| MSL Level 1 | Reflow-compatible up to 245 °C peak - supports standard SMT assembly without dry-pack handling |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller power rails from alternator load dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Clamping TVS placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to 50.1 V, preventing damage to 36 V-rated input stages and enabling robust 12/24 V dual-system designs. |
Use Scenario: Shields LIN bus transceivers and power management ICs from switching noise generated by door lock actuators and lighting loads. IC Role / Device Role / Timing Role: Uni-directional TVS connected anode-to-ground on 12 V supply line upstream of LDO regulators. Use Value: Suppresses repetitive 100 V/50 ms transients while maintaining <10 μA leakage to preserve sleep-mode current budget. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Safeguards image sensor and serializer ICs from ESD and load dump coupled through FAKRA connectors. IC Role / Device Role / Timing Role: Primary front-end protection device mounted adjacent to connector entry point on 12 V input. Use Value: Delivers 3600 W surge capability in compact DO-218AB footprint, minimizing board space versus discrete diode+capacitor solutions. |
Use Scenario: Guards motor driver gate drivers and current sense amplifiers against inductive kickback from 3-phase BLDC motor windings. IC Role / Device Role / Timing Role: High-energy clamping element on main 12 V supply rail feeding H-bridge pre-drivers. Use Value: Withstands 500 A single-pulse surge (8.3 ms) and maintains clamping performance after repeated 175 °C thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5A | Lower PPPM (400 W), SMA package (RθJC = 35 °C/W), bidirectional option available | Not rated for AEC-Q101 or ISO7637-2; limited to low-energy consumer-grade transients | Select only for cost-sensitive non-automotive applications where surge energy is below 100 mJ |
| TPSMD28 | Same DO-218AB package, 3600 W rating, but VC = 48.4 V at 72 A and AEC-Q101 qualified | Offers tighter VBR tolerance (±5 % vs. ±10 % for SM5S28), lower clamping voltage | Prefer when lower clamping headroom is critical and tighter parametric control is required |
Compared with SMAJ28A-E3/5A, SM5S28HE3/2D delivers 9× higher surge power and automotive qualification; versus TPSMD28, it trades slightly higher clamping for broader VBR tolerance and established supply chain maturity in DO-218AB.
Availability
SM5S28HE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering units requiring stable component supply across extended temperature and high-surge environments.
Supply support for SM5S28HE3/2D 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 passive components for automotive, industrial, and computing markets.
The SM5Sxx family was engineered specifically for automotive load dump protection, combining high-power clamping, AEC-Q101 reliability, and DO-218AB thermal performance to replace older axial-leaded and lower-power SMD TVS devices.
FAQ
What is the maximum clamping voltage of the SM5S28HE3/2D under standard test conditions?
The SM5S28HE3/2D has a maximum clamping voltage (VC) of 50.1 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 72 A. This value is measured per the conditions specified in the Vishay datasheet document 88382 and reflects worst-case voltage limiting during high-energy transients such as ISO7637-2 load dump events. The SM5S28HE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S28HE3/2D suitable for bidirectional transient suppression?
No, the SM5S28HE3/2D is a unidirectional TVS diode only, with polarity defined as heatsink = anode and lead 1 = cathode. It conducts and clamps only during reverse-biased overvoltage events. For bidirectional protection, a separate device such as the SM5S28AHE3/2D (which offers symmetrical breakdown) must be selected. The SM5S28HE3/2D datasheet explicitly states "Available in uni-directional polarity only" and confirms anode-heatsink orientation.
Does the SM5S28HE3/2D require a heatsink for normal operation?
The SM5S28HE3/2D does not require an external heatsink for transient suppression duty, as its 3600 W rating applies to single-pulse events. However, its metal heatsink terminal (lead 2) must be soldered to ≥1 cm² of 2 oz copper for effective thermal conduction during repetitive surges or elevated ambient temperatures. The RθJC of 1.0 °C/W assumes direct thermal coupling to PCB copper - no additional heatsink is needed if layout guidelines in the DO-218AB footprint drawing are followed.
What is the leakage current specification for SM5S28HE3/2D at maximum operating temperature?
At VWM = 28.0 V and TJ = 175 °C, the SM5S28HE3/2D exhibits a maximum reverse leakage current (ID) of 150 μA, as confirmed in the "ELECTRICAL CHARACTERISTICS" table of the Vishay datasheet 88382. This is significantly higher than its 25 °C leakage (<10 μA) but remains within design margins for automotive sleep-mode current budgets when used with appropriate upstream fusing and monitoring.
How does the SM5S28HE3/2D comply with automotive reliability standards?
The SM5S28HE3/2D is AEC-Q101 qualified and tested per the full stress sequence including HTGB, AC/DC life test, temperature cycling, and mechanical shock. It also meets ISO7637-2 for load dump immunity and achieves MSL Level 1 per J-STD-020 - allowing reflow without dry-pack preconditioning. These qualifications are documented in Vishay's certification reports referenced in datasheet 88382 and apply specifically to the HE3 suffix variant, including SM5S28HE3/2D.
SM5S28HE3/2D 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):
- 72A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S28HE3/2D FAQ
1.How can I place an order for SM5S28HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S28HE3/2D 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 SM5S28HE3/2D reliable?
The price and inventory of SM5S28HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S28HE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S28HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S28HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S28HE3/2D?
SM5S28HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S28HE3/2D 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 SM5S28HE3/2D?
For technical support, including SM5S28HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S28HE3/2D requirements.
6.How does Aetrix verify that SM5S28HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S28HE3/2D 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 SM5S28HE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S28HE3/2D?
All SM5S28HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S28HE3/2D, 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 SM5S28HE3/2D part is unused and in its original packaging.
Return procedure for SM5S28HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S28HE3/2D Tags
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