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Vishay General Semiconductor - Diodes Division SM5S28ATHE3/I
- Part No.:
- SM5S28ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S28ATHE3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,814
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Product details
Overview
SM5S28ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 28.0 V stand-off voltage (VWM), 31.1–34.4 V breakdown range (VBR), 79 V clamping voltage at 150 A peak pulse current, 3600 W peak pulse power (10/1000 µs), and operates up to TJ = 175 °C in DO-218AC package.
For engineers reviewing the SM5S28ATHE3/I datasheet, SM5S28ATHE3/I pinout, SM5S28ATHE3/I application, or SM5S28ATHE3/I equivalent, this device serves as a high-reliability, AEC-Q101-qualified TVS for 12 V automotive electrical systems requiring robust surge immunity per ISO7637-2 under high-temperature conditions.
Technical Context
The SM5S28ATHE3/I employs passivated anisotropic rectifier technology with junction passivation optimized for stable operation at TJ = 175 °C. Its unidirectional polarity configures the metal heatsink as the anode, enabling direct thermal coupling to PCB copper for enhanced power dissipation.
It delivers 3600 W peak pulse power under 10/1000 µs waveform and sustains 2800 W under 10/10 000 µs, meeting ISO7637-2 load dump test requirements. Thermal resistance RθJC is 1.0 °C/W, supporting high-power transient suppression without external heatsinking when mounted on adequate copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold in 12 V automotive circuits. |
| VBR (min/typ/max) | 31.1 / 32.8 / 34.4 V - Breakdown voltage range at 5 mA test current; defines precise turn-on behavior for predictable clamping onset. |
| VC @ IPPM | 79 V - Clamping voltage at 150 A peak pulse current (10/1000 µs); limits downstream IC stress during load dump events. |
| PPPM (10/1000 µs) | 3600 W - Peak pulse power handling capacity; enables single-event suppression of severe transients without failure. |
| TJ max. | 175 °C - Maximum junction temperature rating; supports under-hood deployment in modern automotive ECUs and body control modules. |
| Package | DO-218AC - Surface-mount package with integrated metal heatsink (anode terminal); provides low thermal resistance (RθJC = 1.0 °C/W) and UL 94 V-0 flammability compliance. |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation in series with protected line to block reverse conduction during normal operation. |
Pinout & Package
SM5S28ATHE3/I uses the DO-218AC package: a two-terminal surface-mount device with a molded plastic body and exposed metal heatsink acting as the anode terminal. The cathode is the leaded terminal. Molding compound meets UL 94 V-0; matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | Positive terminal / Heat path | Connected to system ground or low-impedance return plane; serves dual role as current-carrying terminal and primary thermal interface to PCB copper. |
| Cathode (Lead 1) | Negative terminal / Surge input | Connected to protected line (e.g., battery feed); conducts transient current from line to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance (<10 µA at VWM, 25 °C) and long-term reliability under thermal cycling and humidity exposure. |
| TJ = 175 °C capability | Supports placement near heat-generating components (e.g., power MOSFETs, DC/DC converters) in engine compartment electronics without derating. |
| Meets ISO7637-2 surge specification | Validated for load dump waveforms (including 10 ms exponential), ensuring compliance in automotive OEM power supply designs. |
| AEC-Q101 qualified (HE3 suffix) | Qualified per stress test conditions including HTGB, HTRB, TCT, and ESD; required for production automotive applications. |
| MSL Level 1, LF peak 245 °C | Compatible with standard SMT reflow profiles without moisture sensitivity concerns; eliminates pre-bake requirement. |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Suppresses 12 V battery line transients caused by alternator load dump events (up to 60 V, 100 ms duration) in passenger vehicles. IC Role / Device Role / Timing Role: Primary clamping device placed between battery feed and DC/DC converter input. Use Value: Limits voltage seen by downstream regulators to ≤79 V during 150 A surges, preventing latch-up or permanent damage to PMICs and microcontrollers. |
Use Scenario: Protects 5 V or 3.3 V logic rails inside engine control units exposed to ignition noise and relay switching spikes. IC Role / Device Role / Timing Role: Secondary TVS on post-regulation power rail, coordinated with upstream SM5S28ATHE3/I. Use Value: Provides fast-response (sub-nanosecond) clamping at low clamping voltage, preserving signal integrity for CAN transceivers and sensor interfaces. |
| Body Control Module (BCM) Power Bus | Start-Stop System Battery Interface |
Use Scenario: Shields BCM power inputs from transients generated by power window motors, HVAC blowers, and lighting relays. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V main bus, mounted directly to large copper pour for thermal management. Use Value: Handles repetitive 3600 W pulses without degradation, maintaining protection margin across 15+ year vehicle service life. |
Use Scenario: Safeguards start-stop system electronics during repeated engine cranking and alternator restart cycles. IC Role / Device Role / Timing Role: High-temperature-rated TVS on battery-sensed line feeding intelligent battery sensors and control logic. Use Value: Operates reliably at 175 °C junction temperature while sustaining 2800 W (10/10 000 µs) surges typical of extended cranking events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S28AHM3 | Same VWM (28.0 V), VBR (31.1–34.4 V), and DO-218AC package; HM3 suffix indicates halogen-free, RoHS-compliant construction with identical AEC-Q101 qualification. | No functional difference; intended as direct replacement for new designs where HE3 is marked "Not For New Designs". | Select SM5S28AHM3 for new automotive designs requiring full halogen-free compliance and ongoing production support. |
| SMAJ28A | Lower PPPM (400 W vs. 3600 W), SMA package (RθJC ≈ 40 °C/W), VWM = 28.0 V, VBR = 31.1–34.4 V; not AEC-Q101 qualified. | Suitable only for low-energy transients in non-automotive industrial or consumer applications; cannot meet ISO7637-2 load dump. | Choose SMAJ28A only for cost-sensitive, non-automotive applications with <500 W surge requirements and no high-temperature or qualification mandates. |
Compared with SM5S28ATHE3/I, SM5S28AHM3 offers identical electrical and thermal performance with updated environmental compliance, while SMAJ28A provides basic clamping in smaller form factor but lacks automotive-grade power handling, temperature rating, and qualification.
Availability
SM5S28ATHE3/I is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) power input conditioning, and body control module (BCM) power bus stabilization requiring stable component supply across extended production lifecycles.
Supply support for SM5S28ATHE3/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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability, high-power, and automotive-qualified solutions.
The SM5SxxAT family was engineered specifically for automotive-grade transient suppression in 12 V systems, targeting ISO7637-2 compliance, AEC-Q101 qualification, and operation up to 175 °C junction temperature.
FAQ
What is the maximum clamping voltage of the SM5S28ATHE3/I at its rated peak pulse current?
The SM5S28ATHE3/I has a maximum clamping voltage (VC) of 79 V at 150 A peak pulse current under the 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during automotive load dump events. The SM5S28ATHE3/I achieves this clamping performance while maintaining low leakage (<10 µA at 28.0 V, 25 °C) and stable VBR drift.
Is the SM5S28ATHE3/I qualified for automotive applications?
Yes, the SM5S28ATHE3/I is AEC-Q101 qualified and carries the HE3 suffix indicating RoHS compliance and qualification to JESD201 Class 2 whisker testing. It is explicitly rated for TJ = 175 °C operation and meets ISO7637-2 surge requirements-making it suitable for production automotive applications including engine control units, body control modules, and start-stop systems. The SM5S28ATHE3/I data sheet confirms qualification status in the Mechanical Data section.
What does the "HE3" suffix mean in SM5S28ATHE3/I?
The "HE3" suffix in SM5S28ATHE3/I denotes a RoHS-compliant, AEC-Q101-qualified version with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards, plus JESD201 Class 2 whisker resistance. It also indicates packaging in 13″ plastic tape and reel with anode oriented toward sprocket holes. Vishay documentation states HE3 parts are qualified for automotive use but marked "Not For New Designs" in favor of HM3 variants.
Can the SM5S28ATHE3/I be used in place of the SM5S28AHM3?
The SM5S28ATHE3/I and SM5S28AHM3 share identical electrical specifications (VWM = 28.0 V, VBR = 31.1–34.4 V, VC = 79 V, PPPM = 3600 W), DO-218AC package, and AEC-Q101 qualification. However, HM3 is halogen-free and designated for new designs, while HE3 is legacy-qualified. The SM5S28ATHE3/I remains functionally interchangeable in existing designs but is not recommended for new automotive projects per Vishay's guidance.
What is the thermal resistance from junction to case (RθJC) for the SM5S28ATHE3/I?
The SM5S28ATHE3/I has a typical thermal resistance of RθJC = 1.0 °C/W, measured from junction to the metal heatsink (anode terminal). This low value enables efficient heat transfer to PCB copper planes, allowing sustained power dissipation without external heatsinks. The value is confirmed in the Thermal Characteristics table of the official Vishay document 87609 and applies across the full -55 °C to +175 °C operating range.
SM5S28ATHE3/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):
- 79A
- 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-218AC
SM5S28ATHE3/I FAQ
1.How can I place an order for SM5S28ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S28ATHE3/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 SM5S28ATHE3/I reliable?
The price and inventory of SM5S28ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S28ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM5S28ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S28ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S28ATHE3/I?
SM5S28ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S28ATHE3/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 SM5S28ATHE3/I?
For technical support, including SM5S28ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S28ATHE3/I requirements.
6.How does Aetrix verify that SM5S28ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM5S28ATHE3/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 SM5S28ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM5S28ATHE3/I?
All SM5S28ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S28ATHE3/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 SM5S28ATHE3/I part is unused and in its original packaging.
Return procedure for SM5S28ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S28ATHE3/I Tags
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