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Vishay General Semiconductor - Diodes Division SM8S15AHE3_A/I
- Part No.:
- SM8S15AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S15AHE3_A/I.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
SM8S15AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 15 V stand-off voltage (VWM), 17.6 V nominal breakdown (VBR), 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualified for automotive load dump protection.
For engineers reviewing the SM8S15AHE3_A/I datasheet, SM8S15AHE3_A/I pinout, SM8S15AHE3_A/I application, or SM8S15AHE3_A/I equivalent, this device delivers high-reliability clamping at TJ = 175 °C, low leakage (<10 μA at VWM), and ISO7637-2 compliance - critical for 12 V automotive power rail surge immunity design.
Technical Context
The SM8S15AHE3_A/I uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive transients, with thermal resistance RθJM = 0.35 °C/W enabling efficient heat transfer to the metal heatsink (anode). Its unidirectional polarity and DO-218AB case support high-surge mounting on engine control units and body electronics PCBs.
It operates across -55 °C to +175 °C junction temperature range, exhibits 0.080 %/°C VBR temperature coefficient, and maintains ≤1.8 V forward voltage at 100 A - ensuring predictable turn-on behavior during fast-rising load dump events without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (nom) | 17.6 V - guaranteed breakdown voltage at 5 mA test current, defining precise clamping threshold |
| VC @ IPPM | 24.4 V - maximum clamped voltage at 270 A peak pulse, limiting downstream IC stress |
| PPPM (10/1000 μs) | 6600 W - peak transient energy absorption capability per single surge event |
| TJ max | +175 °C - extended junction temperature rating enabling under-hood deployment |
| ID @ VWM | <10 μA - ultra-low reverse leakage preserving battery drain budgets in always-on systems |
| Polarity | Unidirectional - protects against positive-going transients only; anode tied to heatsink |
Pinout & Package
Package: DO-218AB - molded surface-mount case with integral metal heatsink (anode terminal), UL 94 V-0 rated, RoHS-compliant, JESD201 Class 2 whisker resistant, MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Positive DC rail connection / thermal path | Must be soldered to large copper pour for thermal dissipation; electrically active as cathode-side reference |
| Cathode (Lead 1) | Transient return path / clamping node | Connected to protected line (e.g., battery feed); conducts surge current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including engine control, lighting, and ADAS modules |
| ISO7637-2 compliance | Meets Pulse 5a/b load dump requirements for 12 V vehicle electrical systems |
| Junction temperature capability | Full specification guaranteed up to +175 °C - eliminates derating in high-ambient under-hood locations |
| Low clamping ratio (VC/VBR) | 1.38 - tight margin between breakdown and clamping ensures minimal overvoltage exposure to protected ICs |
| Matte tin-plated leads | Solderable per J-STD-002 and JESD22-B102 - supports robust reflow and long-term intermetallic stability |
Applications
| Engine Control Unit (ECU) Power Protection | Automotive Lighting Module |
|---|---|
Use Scenario: Protects microcontroller and CAN transceiver power rails from alternator load dump surges during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input, clamping transients within 1 ns response time. Use Value: Limits voltage to ≤24.4 V during 6600 W surge, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. | Use Scenario: Shields LED driver ICs and current-sense amplifiers from switching transients generated by high-current headlamp relays. IC Role / Device Role / Timing Role: Mounted directly at lamp harness connector entry point, absorbing inductive kickback from solenoid-based dimming circuits. Use Value: Maintains <10 μA leakage at 15 V, avoiding false fault detection in low-power standby mode of adaptive driving beam systems. |
| Body Control Module (BCM) | Infotainment Power Supply |
Use Scenario: Guards LIN bus transceivers and window motor drivers against ESD and load dump coupled through shared chassis ground. IC Role / Device Role / Timing Role: Anode connected to chassis ground plane; cathode tied to 12 V supply rail feeding multiple subsystems. Use Value: With RθJM = 0.35 °C/W, enables sustained operation at +125 °C ambient without thermal shutdown in sealed BCM enclosures. | Use Scenario: Safeguards USB-C PD controller and audio codec power inputs from ignition-switching noise and jump-start surges. IC Role / Device Role / Timing Role: First-line protection ahead of wide-input buck converter, reducing need for oversized input capacitors. Use Value: 270 A peak pulse current rating handles 10/1000 μs transients exceeding 100 V, meeting OEM infotainment EMC immunity specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S15AHM3_A/I | Same electrical specs and DO-218AB package; HM3 suffix indicates enhanced moisture sensitivity level handling (MSL 1) and updated wafer fab process | No functional difference; intended as direct replacement for new designs where HE3 is obsolete | Select SM8S15AHM3_A/I for new designs - HE3 is Not For New Designs per Vishay documentation |
| SMAJ15A | Lower PPPM (400 W vs. 6600 W), DO-214AC package, no AEC-Q101 qualification, higher VC (24.4 V same but lower surge margin) | Suitable only for low-energy consumer-grade transients; not validated for automotive load dump or under-hood temperature | Use SMAJ15A only in cost-sensitive non-automotive applications with <500 W surge exposure |
Compared with SM8S15AHE3_A/I, SM8S15AHM3_A/I offers identical protection performance with improved manufacturability and lifecycle support, while SMAJ15A provides basic clamping at significantly reduced surge capacity and automotive qualification - making it unsuitable for load dump-critical systems.
Availability
SM8S15AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU power protection, lighting module surge immunity, and body control module transient suppression requiring stable component supply and AEC-Q101 traceability.
Supply support for SM8S15AHE3_A/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 and automotive-grade components.
The SM8S series is designed specifically for high-energy automotive load dump protection, leveraging PAR® technology to deliver industry-leading 6600 W surge capability in surface-mount form with AEC-Q101 validation.
FAQ
Is SM8S15AHE3_A/I qualified for automotive applications?
Yes, SM8S15AHE3_A/I is AEC-Q101 qualified and meets ISO7637-2 Pulse 5a/b requirements for 12 V automotive load dump protection. It operates reliably from -55 °C to +175 °C junction temperature and is rated for under-hood environments in engine control units and body electronics modules. The SM8S15AHE3_A/I datasheet confirms full qualification testing per AEC-Q101 Rev D.
What is the clamping voltage of SM8S15AHE3_A/I at maximum surge current?
The SM8S15AHE3_A/I has a maximum clamping voltage (VC) of 24.4 V at its rated peak pulse current (IPPM) of 270 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and ensures protected downstream circuitry remains below safe overvoltage thresholds. The SM8S15AHE3_A/I achieves this with a clamping ratio of 1.38 (VC/VBR), indicating tight voltage control.
Does SM8S15AHE3_A/I have bidirectional polarity?
No, SM8S15AHE3_A/I is unidirectional only. Its polarity is fixed: the metal heatsink serves as the anode, and Lead 1 is the cathode. It protects against positive-going transients on the cathode side relative to the anode/heatsink. Bidirectional variants are not offered in the SM8S15AHE3_A/I family - use SM8S15CAHE3_A/I only if reverse-polarity surge protection is required.
What package type does SM8S15AHE3_A/I use and how is it mounted?
SM8S15AHE3_A/I uses the DO-218AB surface-mount package with integral metal heatsink. The anode is the exposed metal base, which must be soldered to a large copper thermal pad for effective heat dissipation. Lead 1 (cathode) is the signal-side terminal. Mounting follows IPC-7351 footprint guidelines and supports reflow per J-STD-020 MSL Level 1.
Why is SM8S15AHE3_A/I marked as "Not For New Designs"?
Vishay explicitly states "Not For New Designs" for SM8S15AHE3_A/I in Document 88387, recommending SM8S15AHM3_A/I as the alternative. The HE3 version remains available for legacy production and repair, but HM3 offers updated process control, enhanced moisture sensitivity handling, and continued long-term supply assurance. Engineers designing new automotive systems should specify SM8S15AHM3_A/I instead of SM8S15AHE3_A/I.
SM8S15AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 270A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S15AHE3_A/I FAQ
1.How can I place an order for SM8S15AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S15AHE3_A/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 SM8S15AHE3_A/I reliable?
The price and inventory of SM8S15AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S15AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S15AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S15AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S15AHE3_A/I?
SM8S15AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S15AHE3_A/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 SM8S15AHE3_A/I?
For technical support, including SM8S15AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S15AHE3_A/I requirements.
6.How does Aetrix verify that SM8S15AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S15AHE3_A/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 SM8S15AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S15AHE3_A/I?
All SM8S15AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S15AHE3_A/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 SM8S15AHE3_A/I part is unused and in its original packaging.
Return procedure for SM8S15AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S15AHE3_A/I Tags
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