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Vishay General Semiconductor - Diodes Division SM6S28AHM3/I
- Part No.:
- SM6S28AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S28AHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,785
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Product details
Overview
SM6S28AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 28 V stand-off voltage (VWM), 32.8 V nominal breakdown (VBR), 45.4 V clamping voltage at 101 A peak pulse current, and 4600 W peak pulse power (10/1000 μs). It delivers AEC-Q101 qualification, 175 °C junction temperature capability, and automotive load dump protection in engine control units and body electronics.
For engineers reviewing the SM6S28AHM3/I datasheet, SM6S28AHM3/I pinout, SM6S28AHM3/I application, or SM6S28AHM3/I equivalent, this page provides verified electrical parameters, thermal performance data, DO-218AB mechanical interface details, and qualified alternatives for automotive-grade circuit protection design.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM), low forward voltage drop (≤1.9 V at 100 A), and stable clamping under high-temperature operation up to TJ = 175 °C. Its unidirectional polarity and heatsink-anode configuration support robust mounting on metal substrates for thermal management.
The device meets ISO 7637-2 surge requirements for automotive load dump transients and complies with MSL Level 1 (245 °C reflow peak). Thermal resistance is characterized as RθJM = 0.45 °C/W (junction-to-mount) and RθJA = 55 °C/W (junction-to-ambient on FR4).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating window in 24 V automotive systems. |
| VBR (nom) | 32.8 V - Breakdown voltage at 5 mA test current; ensures reliable turn-on during transients exceeding system nominal voltage. |
| VC @ IPPM | 45.4 V - Clamping voltage at 101 A (10/1000 μs); limits downstream IC stress during load dump events. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling; supports high-energy surges per ISO 7637-2 Pulse 5a without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot engine compartments or power stages. |
| ID @ VWM | <10 μA - Reverse leakage at 28 V; minimizes standby power loss in always-on vehicle modules. |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTOL, TC, HAST, and UHAST; required for ECU front-end protection. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with integral metal heatsink (anode terminal), UL 94 V-0 rated, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Mounting pad layout follows IPC-7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive terminal / thermal path | Electrically connected to metal heatsink base; must be soldered to large copper pour for RθJM = 0.45 °C/W thermal performance. |
| Cathode (Lead 1) | Transient current return path | Connected to protected circuit ground or low-side return; carries full surge current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR drift <±5 % over 1000 hrs HTOL at 175 °C; critical for long-life automotive deployments. |
| Unidirectional polarity only | Eliminates need for series blocking diode in DC-biased protection paths; simplifies layout vs. bidirectional TVS. |
| MSL Level 1 rating | Allows single-pass 245 °C reflow without moisture-induced popcorning; compatible with standard SMT assembly lines. |
| ISO 7637-2 compliance | Validated for Pulse 5a (load dump) up to 100 V/10 ms exponential waveform; meets OEM-level EMC requirements. |
| HE3 suffix construction | Meets JESD201 Class 2 whisker resistance; prevents tin whisker growth in high-reliability under-hood applications. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) LIN Bus Line Protection |
|---|---|
Use Scenario: Protects 24 V supply rail of diesel/gasoline ECUs against alternator load dump surges up to 100 V. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point before DC/DC converter input. Use Value: Limits voltage seen by downstream buck controller to ≤45.4 V, preventing overvoltage shutdown or latch-up. |
Use Scenario: Shields LIN transceiver I/O pins from coupled transients induced by nearby high-current solenoid switching. IC Role / Device Role / Timing Role: Low-capacitance TVS placed in series with LIN bus line, grounded via short trace to chassis. Use Value: Maintains signal integrity with <10 μA leakage at 12 V, avoiding false wake-up or communication errors. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Rail | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Guards 12 V input of image sensor module against battery feed transients during cold-crank or jump-start. IC Role / Device Role / Timing Role: First-line defense between connector and LDO regulator; operates within -55 °C to +175 °C ambient range. Use Value: Survives repeated 4600 W surges without parameter shift, ensuring consistent protection across vehicle lifetime. |
Use Scenario: Absorbs inductive kickback from H-bridge MOSFETs during EPS motor commutation. IC Role / Device Role / Timing Role: Mounted directly on heatsink adjacent to gate driver IC; anode tied to chassis ground plane. Use Value: Dissipates 3600 W (10/10,000 μs) energy without thermal runaway, enabling compact motor control PCB layout. |
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 electrical specs and DO-218AB package; differs only in packaging - bulk vs. tape-and-reel (I suffix denotes 13" reel, 750 pcs). | No functional difference; suitable for same automotive applications but requires different inventory handling and SMT feeder setup. | Select SM6S28AHM3/I when automated pick-and-place production demands standardized reel delivery and traceability. |
| SM6S30AHM3/I | Higher VWM (30 V) and VBR (35.1 V nominal); clamping voltage 48.4 V at 95 A; otherwise identical construction and qualification. | Better suited for 24 V systems with wider voltage tolerance (e.g., commercial truck 28 V nominal), less margin for 24 V ECUs. | Choose SM6S30AHM3/I only if system VWM exceeds 28 V or if higher clamping threshold is acceptable for downstream component ratings. |
Compared with SM6S28AHM3/I, SM6S28AHM3 offers identical protection performance with bulk packaging flexibility, while SM6S30AHM3/I trades lower clamping headroom for higher stand-off margin-critical when protecting circuits with tighter voltage tolerances.
Availability
SM6S28AHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body electronics modules, and ADAS camera power rails requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.
Supply support for SM6S28AHM3/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-temperature, and automotive-qualified components.
The SM6SxxA family was developed specifically for automotive load dump and inductive switching transient suppression, targeting under-hood and safety-critical electronic control units requiring AEC-Q101 validation and 175 °C operation.
FAQ
What is the maximum clamping voltage of the SM6S28AHM3/I under a 10/1000 μs surge?
The SM6S28AHM3/I has a maximum clamping voltage (VC) of 45.4 V at 101 A peak pulse current under the 10/1000 μs waveform. This value is measured per standard test conditions and ensures downstream components see limited overvoltage during automotive load dump events. The SM6S28AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM6S28AHM3/I qualified for automotive applications?
Yes, the SM6S28AHM3/I is AEC-Q101 qualified and rated for operation from –55 °C to +175 °C junction temperature. It meets ISO 7637-2 Pulse 5a load dump requirements and is constructed with HE3 suffix to satisfy JESD201 Class 2 whisker resistance-making it suitable for engine control units, body modules, and other automotive systems. The SM6S28AHM3/I carries full qualification documentation from Vishay.
What does the "I" suffix mean in SM6S28AHM3/I?
The "I" suffix in SM6S28AHM3/I indicates packaging in 13-inch diameter plastic tape and reel, with 750 units per reel and anode orientation toward the sprocket hole. This format is optimized for automated SMT placement. The core device-SM6S28AHM3-is electrically and mechanically identical; only the packaging differs from bulk or other reel variants. The SM6S28AHM3/I ensures consistent feeding and traceability in high-volume production.
Can the SM6S28AHM3/I replace older SM6S28A variants?
The SM6S28AHM3/I replaces legacy SM6S28A with enhanced reliability: it adds AEC-Q101 qualification, HE3 whisker-resistant plating, and MSL Level 1 rating. While pin-compatible and electrically equivalent, the SM6S28AHM3/I is not a drop-in replacement for non-HM3 versions in new designs requiring automotive qualification. Always verify layout compatibility with DO-218AB footprint and thermal pad requirements for the SM6S28AHM3/I.
What is the thermal resistance of the SM6S28AHM3/I when mounted on a PCB?
The SM6S28AHM3/I has RθJA = 55 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and JEDEC 51-2A conditions. With proper heatsink attachment to its metal anode base, RθJM drops to 0.45 °C/W-enabling efficient power dissipation during repetitive surges. These values are measured per JEDEC standards and apply directly to the SM6S28AHM3/I in production assemblies.
SM6S28AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SM6S28AHM3/I FAQ
1.How can I place an order for SM6S28AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S28AHM3/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 SM6S28AHM3/I reliable?
The price and inventory of SM6S28AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S28AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6S28AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S28AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S28AHM3/I?
SM6S28AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S28AHM3/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 SM6S28AHM3/I?
For technical support, including SM6S28AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S28AHM3/I requirements.
6.How does Aetrix verify that SM6S28AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6S28AHM3/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 SM6S28AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6S28AHM3/I?
All SM6S28AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S28AHM3/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 SM6S28AHM3/I part is unused and in its original packaging.
Return procedure for SM6S28AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S28AHM3/I Tags
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