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Vishay General Semiconductor - Diodes Division SM8S15ATHE3/I
- Part No.:
- SM8S15ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S15ATHE3/I.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:747
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Product details
Overview
SM8S15ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 15 V stand-off voltage (VWM), 17.6 V nominal breakdown voltage (VBR), 24.4 V clamping voltage at 270 A peak pulse current, 6600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S15ATHE3/I datasheet, SM8S15ATHE3/I pinout, SM8S15ATHE3/I application, or SM8S15ATHE3/I equivalent, key selection criteria include its DO-218AC package thermal performance (RθJC = 0.90 °C/W), 175 °C junction temperature rating, low leakage (<10 µA at VWM), and compliance with ISO7637-2 surge testing - critical for 12 V automotive power rail hardening.
Technical Context
The SM8S15ATHE3/I employs passivated anisotropic rectifier technology to achieve stable clamping under high-temperature transients. Its unidirectional polarity configures the metal heatsink as the anode, enabling direct thermal coupling to PCB copper planes for efficient heat dissipation during 10/1000 µs surges up to 6600 W.
It operates across –55 °C to +175 °C, with a positive temperature coefficient of VBR (0.080 %/°C), ensuring predictable voltage drift in engine compartment environments. The device meets MSL Level 1 and JESD201 Class 2 whisker resistance, supporting lead-free reflow assembly without solder joint reliability concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.0 V - maximum reverse working voltage before conduction; defines safe operating margin below load dump threshold |
| VBR (nom) | 17.6 V at 5 mA - precise breakdown initiation point for controlled clamping onset |
| VC @ IPPM | 24.4 V at 270 A - clamped voltage limiting downstream IC stress during ISO7637-2 Pulse 5a events |
| PPPM (10/1000 µs) | 6600 W - peak surge energy handling capacity for automotive load dump suppression |
| TJ max | +175 °C - enables placement near high-heat sources (e.g., ECUs, power modules) without derating |
| RθJC | 0.90 °C/W - low thermal resistance from junction to case supports >8 W continuous dissipation with proper heatsinking |
| Leakage @ VWM | <10 µA at 25 °C - minimizes standby power loss in always-on vehicle networks |
Pinout & Package
Package: DO-218AC - thermally enhanced surface-mount outline with integral metal heatsink; anode connected to exposed metal tab (Lead 2), cathode on molded lead (Lead 1); UL 94 V-0 compliant molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (molded) | Cathode | Connected to protected circuit node; carries full surge current during clamping |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path to PCB copper; must be soldered to ≥250 mm² thermal pad for rated power handling |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test requirements including HTOL, TCT, and HAST |
| Junction passivation | Stable VBR over lifetime and temperature; eliminates parameter drift in high-humidity engine bay environments |
| ISO7637-2 compliance | Withstands repetitive 12 V system load dump pulses (Pulse 5a) without degradation |
| MSL Level 1 | Unlimited floor life; compatible with standard SMT reflow profiles up to 245 °C peak |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in long-life automotive modules (>15 years field operation) |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load dump spikes during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamps transient overvoltage within 1 ns to limit downstream DC-DC converter input stress. Use Value: Maintains system uptime by preventing latch-up or burnout of PMICs and microcontrollers during 120 V/100 ms load dump events. | Use Scenario: Shields BCM power supply feeding isolated CAN transceivers during vehicle ignition cycling. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed upstream of LDO regulators powering CAN PHY layers. Use Value: Ensures CAN communication integrity by holding rail voltage below 26 V during ISO7637-2 Pulse 5a, avoiding transceiver shutdown. |
| ADAS Camera Module Power Supply | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Guards image sensor and ISP power rails in front-facing ADAS cameras exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Primary overvoltage suppression element on 12 V input before buck converters generating 3.3 V/1.8 V rails. Use Value: Prevents pixel corruption or sensor reset by clamping transients to ≤24.4 V while sustaining 175 °C junction operation. | Use Scenario: Protects gate driver ICs and MOSFETs in EPS motor control H-bridges from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: High-energy TVS absorbing flyback energy from motor windings during fault conditions. Use Value: Enables robust motor control by limiting voltage overshoot to 24.4 V at 270 A, preventing gate oxide rupture in 40 V-rated drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S15AHM3 | Same electrical specs; HM3 suffix indicates halogen-free, matte tin-plated leads with enhanced whisker resistance (JESD201 Class 2A) | Preferred for new designs targeting long-term reliability in high-vibration automotive modules | Select SM8S15AHM3 for new designs; SM8S15ATHE3/I remains valid for legacy production continuity |
| SMAJ15A | Lower PPPM (400 W vs. 6600 W); DO-214AC package; RθJC ≈ 50 °C/W; not AEC-Q101 qualified | Suitable only for non-automotive, low-energy surge environments (e.g., industrial I/O) | Not recommended for automotive load dump; use only where peak surge energy ≤400 W and AEC-Q101 not required |
Compared with SM8S15AHM3, the SM8S15ATHE3/I offers identical clamping and thermal performance but lacks the updated halogen-free material set and Class 2A whisker rating; compared with SMAJ15A, it delivers 16.5× higher surge power handling and automotive-grade qualification - essential for 12 V system survivability.
Availability
SM8S15ATHE3/I is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, ADAS camera systems, and electric power steering applications requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM8S15ATHE3/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 reliability and automotive qualification.
The SM8SxxAT family was engineered specifically for high-energy automotive load dump protection, combining DO-218AC thermal efficiency with AEC-Q101 validation to replace older axial-leaded TVS solutions in space-constrained ECUs.
FAQ
What is the clamping voltage of the SM8S15ATHE3/I at its rated peak pulse current?
The SM8S15ATHE3/I has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 270 A under the 10/1000 µs waveform. This value is measured at TC = 25 °C and ensures downstream components remain within safe operating voltage limits during ISO7637-2 load dump events. The SM8S15ATHE3/I maintains this clamping performance across its full operating temperature range due to its stable passivated junction design.
Is the SM8S15ATHE3/I suitable for new automotive designs?
No - Vishay explicitly marks SM8S15ATHE3/I as "Not For New Designs", recommending SM8S15AHM3 as the replacement. While the SM8S15ATHE3/I remains fully functional and supported for legacy production, new designs should adopt the HM3 variant for improved halogen-free compliance and enhanced whisker resistance (JESD201 Class 2A). The SM8S15ATHE3/I retains identical electrical and thermal specifications to the HM3 version.
How is the anode and cathode oriented on the SM8S15ATHE3/I DO-218AC package?
On the SM8S15ATHE3/I in DO-218AC packaging, the metal heatsink (Lead 2) is the anode, and the molded lead (Lead 1) is the cathode. This polarity is fixed and unidirectional; incorrect orientation will prevent proper clamping function and may cause catastrophic failure. The anode must be connected to the power rail (e.g., battery +12 V), and the cathode to the protected circuit node.
What is the thermal resistance from junction to case (RθJC) for the SM8S15ATHE3/I?
The SM8S15ATHE3/I has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W. This low value reflects the DO-218AC package's integrated metal heatsink, which provides direct thermal conduction from the silicon die to the PCB copper plane. To achieve rated power dissipation, the anode (metal tab) must be soldered to a minimum 250 mm² copper area with ≥2 thermal vias per mm².
Does the SM8S15ATHE3/I meet ISO7637-2 requirements for automotive load dump protection?
Yes - the SM8S15ATHE3/I is specified to meet ISO7637-2 surge requirements, particularly Pulse 5a (load dump), under defined test conditions. Its 6600 W peak pulse power rating (10/1000 µs) and 24.4 V clamping voltage enable reliable suppression of 12 V system transients up to 120 V amplitude. System-level validation per ISO7637-2 is still required, but the SM8S15ATHE3/I satisfies the core device-level surge capability needed for compliance.
SM8S15ATHE3/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):
- 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-218AC
SM8S15ATHE3/I FAQ
1.How can I place an order for SM8S15ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S15ATHE3/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 SM8S15ATHE3/I reliable?
The price and inventory of SM8S15ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S15ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S15ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S15ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S15ATHE3/I?
SM8S15ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S15ATHE3/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 SM8S15ATHE3/I?
For technical support, including SM8S15ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S15ATHE3/I requirements.
6.How does Aetrix verify that SM8S15ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S15ATHE3/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 SM8S15ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S15ATHE3/I?
All SM8S15ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S15ATHE3/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 SM8S15ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S15ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S15ATHE3/I Tags
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