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Vishay General Semiconductor - Diodes Division SM6S28ATHE3/I
- Part No.:
- SM6S28ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S28ATHE3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,804
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Product details
Overview
SM6S28ATHE3/I 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 31.1–34.4 V breakdown voltage (VBR), 45.4 V clamping voltage (VC) at 101 A peak pulse current, 4600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM6S28ATHE3/I datasheet, SM6S28ATHE3/I pinout, SM6S28ATHE3/I application, or SM6S28ATHE3/I equivalent, this page delivers verified electrical parameters, DO-218AC package details, thermal resistance (RθJC = 0.95 °C/W), high-temperature operation up to 175 °C, and automotive-grade reliability data - all critical for robust power rail protection design.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver low leakage (<10 µA at VWM = 28 V), low forward voltage drop (≤1.9 V at 100 A), and stable clamping performance across -55 °C to +175 °C junction temperature range. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to metal chassis for enhanced thermal dissipation.
The device meets ISO 7637-2 surge requirements for automotive load dump transients and complies with MSL Level 1 (peak reflow ≤245 °C). Its DO-218AC package supports high surge capability (IFSM = 600 A, 8.3 ms half-sine) while maintaining UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 31.1 / 32.8 / 34.4 V - ensures reliable turn-on above system nominal voltage while avoiding false triggering during normal operation |
| VWM | 28.0 V - maximum continuous reverse working voltage compatible with 24 V automotive systems |
| VC @ IPPM | 45.4 V at 101 A - limits downstream component stress during 10/1000 µs transients |
| PPPM (10/1000 µs) | 4600 W - sustains high-energy load dump surges without failure |
| RθJC | 0.95 °C/W - enables efficient heat transfer to heatsink, supporting sustained power dissipation |
| TJ max | +175 °C - qualified for under-hood environments per AEC-Q101 |
| IFSM | 600 A (8.3 ms) - withstands repetitive motor commutation and alternator switching surges |
Pinout & Package
Package: DO-218AC - surface-mount, anode-heatsink configuration with matte tin-plated leads; RoHS-compliant and AEC-Q101 qualified (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to heatsink/mounting plane; must be thermally coupled to PCB copper pour or chassis for RθJC optimization |
| Lead 2 | Cathode | High-side connection to protected line; carries full clamping current during transient events |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process reduces leakage drift over temperature and lifetime |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock |
| ISO 7637-2 compliance | Meets Pulse 5a/b load dump test conditions for 12 V and 24 V vehicle electrical systems |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 245 °C peak without moisture-induced damage |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation enhances fire safety in enclosed automotive modules |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Voltage spikes up to 120 V generated by alternator field coil de-energization during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECU input filter capacitor. Use Value: Clamps transients to ≤45.4 V within nanoseconds, preventing damage to 40 V-rated DC/DC converters and microcontrollers. |
Use Scenario: Transient suppression on 12 V supply input of engine control module exposed to ignition noise and relay switching. IC Role / Device Role / Timing Role: Primary overvoltage protection device upstream of LDO regulators and CAN transceivers. Use Value: Withstands 600 A surge current and maintains <10 µA leakage at 28 V, ensuring low quiescent power loss and signal integrity. |
| Body Control Module (BCM) Power Rail | ADAS Camera Power Interface |
Use Scenario: Protection against load dump and jump-start surges in centralized body electronics managing lighting, windows, and locks. IC Role / Device Role / Timing Role: High-power TVS mounted directly to metal housing for thermal conduction. Use Value: 0.95 °C/W thermal resistance enables stable operation at 175 °C ambient, eliminating derating concerns in sealed enclosures. |
Use Scenario: Front-facing camera module powered from vehicle battery with minimal board space and no external heatsink. IC Role / Device Role / Timing Role: Compact DO-218AC TVS integrated into 4-layer PCB with internal ground plane thermal coupling. Use Value: 4600 W peak power rating and 28 V stand-off allow direct placement before buck converter, reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S28AHM3 | Same VBR, VC, and PPPM; HM3 suffix indicates halogen-free, lead-free, and RoHS-compliant construction with identical DO-218AC package | Identical functional role; preferred for new designs due to updated environmental compliance and longer product lifecycle | Select SM6S28AHM3 for new designs requiring long-term availability and stricter material compliance; SM6S28ATHE3/I remains valid for legacy production continuity |
| SMAJ28A | Lower PPPM (400 W vs. 4600 W); SMA package (DO-214AC); higher VC (45.7 V); not AEC-Q101 qualified | Limited to low-energy consumer or industrial applications; unsuitable for automotive load dump | Use SMAJ28A only in cost-sensitive, non-automotive applications where surge energy is below 100 mJ and AEC-Q101 is not required |
Compared with SM6S28AHM3, the SM6S28ATHE3/I offers identical electrical performance but lacks halogen-free certification and has limited future availability; compared with SMAJ28A, it delivers 11.5× higher surge power handling and automotive qualification - making it essential for under-hood deployment where reliability and energy absorption are non-negotiable.
Availability
SM6S28ATHE3/I is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) power inputs, and body control module (BCM) power rails requiring stable component supply across extended production lifecycles.
Supply support for SM6S28ATHE3/I 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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM6SxxAT family was engineered specifically for automotive-grade transient suppression, emphasizing high-temperature stability (TJ = 175 °C), ISO 7637-2 compliance, and robust surge endurance in harsh under-hood environments.
FAQ
What is the clamping voltage of SM6S28ATHE3/I at its rated peak pulse current?
The SM6S28ATHE3/I has a maximum clamping voltage (VC) of 45.4 V when subjected to its 10/1000 µs peak pulse current of 101 A. This value is measured per standard test conditions (TC = 25 °C) and defines the upper voltage limit imposed on protected circuitry during transient events. The SM6S28ATHE3/I maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive power systems.
Is SM6S28ATHE3/I qualified for automotive applications?
Yes, the SM6S28ATHE3/I is AEC-Q101 qualified and explicitly intended for automotive use. Its qualification covers temperature cycling, humidity bias, mechanical shock, and high-temperature operating life testing. The HE3 suffix denotes RoHS compliance and JESD 201 Class 2 whisker resistance - both required for modern automotive electronics. The SM6S28ATHE3/I meets ISO 7637-2 Pulse 5a/b for load dump protection, confirming its suitability for under-hood deployment.
What package type does SM6S28ATHE3/I use, and how is it mounted?
The SM6S28ATHE3/I uses the DO-218AC surface-mount package, featuring a metal heatsink as the anode terminal (Lead 1) and a cathode lead (Lead 2). Mounting requires soldering Lead 1 directly to a large copper pour or metal chassis to exploit its 0.95 °C/W junction-to-case thermal resistance. The package is MSL Level 1 compliant and supports standard 245 °C peak reflow profiles. The SM6S28ATHE3/I's anode-heatsink configuration enables efficient thermal management without discrete heatsinks.
How does SM6S28ATHE3/I differ from SM6S28AHM3?
The SM6S28ATHE3/I and SM6S28AHM3 share identical electrical specifications (VBR, VC, PPPM, TJ max) and DO-218AC packaging, but differ in environmental compliance and lifecycle status. The HM3 suffix indicates halogen-free, lead-free, and fully RoHS-compliant construction, while HE3 is RoHS-compliant but not halogen-free. Vishay designates SM6S28AHM3 as the recommended alternative for new designs; the SM6S28ATHE3/I remains supported for legacy production continuity.
What is the maximum reverse leakage current of SM6S28ATHE3/I at 28 V and 175 °C?
At VWM = 28 V and TJ = 175 °C, the SM6S28ATHE3/I exhibits a maximum reverse leakage current (ID) of 10 µA. This value is specified in the Vishay datasheet (Document Number 87735, page 2) and reflects stable performance under extreme automotive operating conditions. Low leakage preserves system efficiency and prevents false triggering in high-impedance monitoring circuits - a key advantage of the SM6S28ATHE3/I in always-on vehicle modules.
SM6S28ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 101A
- 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-218AC
SM6S28ATHE3/I FAQ
1.How can I place an order for SM6S28ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S28ATHE3/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 SM6S28ATHE3/I reliable?
The price and inventory of SM6S28ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S28ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM6S28ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S28ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S28ATHE3/I?
SM6S28ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S28ATHE3/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 SM6S28ATHE3/I?
For technical support, including SM6S28ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S28ATHE3/I requirements.
6.How does Aetrix verify that SM6S28ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM6S28ATHE3/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 SM6S28ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM6S28ATHE3/I?
All SM6S28ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S28ATHE3/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 SM6S28ATHE3/I part is unused and in its original packaging.
Return procedure for SM6S28ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S28ATHE3/I Tags
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