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Vishay General Semiconductor - Diodes Division SM8S15AHM3/I
- Part No.:
- SM8S15AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S15AHM3/I.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,658
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Product details
Overview
SM8S15AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 15 V stand-off voltage (VWM), 17.6 V nominal breakdown voltage (VBR), and 6600 W peak pulse power (10/1000 μs). It delivers AEC-Q101 qualification, 175 °C junction temperature capability, and low leakage (<10 μA at VWM), designed specifically for automotive load dump protection.
For engineers reviewing the SM8S15AHM3/I datasheet, SM8S15AHM3/I pinout, SM8S15AHM3/I application, or SM8S15AHM3/I equivalent, this page provides verified electrical parameters, thermal performance data, automotive-grade reliability evidence, and direct alternative part comparisons - all confirmed against Vishay Document #88387 and official ordering information.
Technical Context
The SM8S15AHM3/I uses passivated anisotropic rectifier technology to achieve stable clamping under high-energy transients. Its unidirectional polarity and heatsink-anode configuration enable efficient thermal coupling to PCB copper planes, supporting sustained 8 W power dissipation on infinite heatsink at 25 °C.
It meets ISO 7637-2 surge requirements for automotive load dump events and complies with MSL Level 1 (245 °C reflow peak), JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability - all validated per AEC-Q101 stress testing at TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before significant conduction begins; sets system-level overvoltage trip threshold. |
| VBR (nom) | 17.6 V - Measured at 5 mA test current; defines precise clamping onset point for transient suppression. |
| VC @ IPPM | 24.4 V - Clamped voltage at 270 A peak pulse current (10/1000 μs); determines protected circuit's maximum transient exposure. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capacity; enables robust protection against severe load dump surges. |
| TJ max | +175 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments. |
| ID @ VWM | <10 μA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| RθJM | 0.35 °C/W - Junction-to-mount thermal resistance; confirms effective heat transfer to PCB heatsink pad. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with matte tin-plated leads, UL 94 V-0 compliant molding compound, and heatsink-integrated anode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current entry / thermal path | Electrically connected to metal heatsink base; must be soldered to large copper area for thermal management and electrical reference. |
| Cathode | Current exit / protected line connection | Connected to the line being protected (e.g., 12 V battery rail); clamps transients to anode potential during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, mechanical shock, and lifetime reliability stress tests per JEDEC standard. |
| Junction passivation | Optimized anisotropic rectifier die structure minimizes parameter drift over time and temperature cycling. |
| MSL Level 1 | Rated for 245 °C peak reflow without moisture-induced failure - eliminates pre-bake requirement in SMT assembly. |
| ISO 7637-2 compliance | Meets automotive load dump surge immunity requirements (Pulse 5a/b) when mounted per recommended footprint. |
| Low VF at high IF | ≤1.8 V forward voltage at 100 A pulse (300 μs) - reduces conduction loss during bidirectional fault conditions. |
Applications
| Automotive Load Dump Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs), body control modules (BCMs), and infotainment systems during alternator load dump events in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between battery rail and downstream DC/DC converter input. Use Value: Clamps 12 V system transients up to 24.4 V at 270 A, preventing damage to sensitive 3.3 V/5 V logic supplies. | Use Scenario: Safeguarding power distribution networks in ADAS cameras, radar modules, and telematics gateways exposed to switching noise and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode installed at board-level power entry point to absorb fast-rising transients. Use Value: Delivers 6600 W peak pulse power handling with <10 μA leakage, preserving low-power sleep mode integrity. |
| Industrial Motor Drive I/O Protection | Commercial Vehicle Battery Management |
Use Scenario: Shielding digital I/O lines and sensor interfaces in PLCs and motor drives from inductive kickback generated by solenoid or relay coils. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across isolated CAN or RS-485 bus lines referenced to chassis ground. Use Value: Withstands repetitive 10/1000 μs surges up to 270 A while maintaining 15 V operational margin for 24 V control systems. | Use Scenario: Securing BMS cell monitoring circuits and charge/discharge FET drivers in Class 8 truck battery packs subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V auxiliary supply feeding microcontroller and analog front-end. Use Value: Qualified to TJ = 175 °C and MSL Level 1, enabling reliable operation in sealed, high-temperature battery enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S15AHE3_A/I | Same electrical specs and DO-218AB package; differs only in packaging suffix (HE3 vs HM3) and reel orientation (anode toward sprocket hole vs unspecified). | No functional difference; identical AEC-Q101 qualification and thermal performance. | Select SM8S15AHE3_A/I if legacy design uses HE3 tape-and-reel delivery or requires documented anode-first placement. |
| SMAJ15A | Lower PPPM (400 W vs 6600 W), smaller DO-214AC package, no AEC-Q101 qualification, higher RθJA (95 °C/W vs 55 °C/W). | Not suitable for automotive load dump; limited to low-energy ESD or inductive spike suppression in consumer or industrial gear. | Choose SMAJ15A only for cost-sensitive non-automotive applications where 6600 W surge capacity and 175 °C operation are unnecessary. |
Compared with SM8S15AHE3_A/I, the SM8S15AHM3/I offers identical protection performance but with updated packaging logistics; versus SMAJ15A, it delivers 16.5× higher surge power, automotive qualification, and superior thermal management - making it the sole viable option for under-hood 12 V system protection.
Availability
SM8S15AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial motor control, and commercial vehicle power systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for SM8S15AHM3/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, MOSFETs, and TVS devices with emphasis on high-reliability, high-power, and automotive-grade solutions.
The SM8S series was engineered specifically for demanding automotive load dump protection, combining ultra-high surge capability, extended temperature operation, and robust packaging to meet stringent OEM requirements.
FAQ
What is the clamping voltage of the SM8S15AHM3/I at its rated peak pulse current?
The SM8S15AHM3/I has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 270 A under the standard 10/1000 μs waveform. This value is measured per Vishay Document #88387 and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM8S15AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM8S15AHM3/I qualified for automotive applications?
Yes, the SM8S15AHM3/I is AEC-Q101 qualified and explicitly designed for automotive use. It passes stress tests including high-temperature operating life, temperature cycling, and humidity bias HAST - all validated up to TJ = 175 °C. Vishay documentation confirms its suitability for load dump protection in engine control units, body modules, and ADAS subsystems.
What does the "HM3" suffix indicate in SM8S15AHM3/I?
The "HM3" suffix in SM8S15AHM3/I denotes AEC-Q101 qualification ("H") and RoHS-compliant, lead-free, halogen-free construction ("M3"). It replaces earlier "HE3" variants and reflects Vishay's updated material categorization and environmental compliance standards per document #99912. The "I" indicates 13-inch tape-and-reel packaging with 750 units per reel.
Can the SM8S15AHM3/I replace the SM8S15AHE3_A/I in existing designs?
Yes, the SM8S15AHM3/I is functionally and electrically identical to the SM8S15AHE3_A/I, sharing the same VWM, VBR, VC, PPPM, and thermal characteristics. The only differences are packaging logistics (reel orientation and marking code), both fully compatible with standard SMT assembly. No layout or schematic changes are required when substituting SM8S15AHM3/I for SM8S15AHE3_A/I.
What is the thermal resistance from junction to ambient for the SM8S15AHM3/I?
The SM8S15AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 55 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and the recommended footprint per IPC-7351. This value assumes natural convection cooling and is critical for calculating safe power derating above 25 °C ambient. The lower RθJM of 0.35 °C/W confirms strong thermal coupling to the heatsink pad.
SM8S15AHM3/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):
- 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
SM8S15AHM3/I FAQ
1.How can I place an order for SM8S15AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S15AHM3/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 SM8S15AHM3/I reliable?
The price and inventory of SM8S15AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S15AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S15AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S15AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S15AHM3/I?
SM8S15AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S15AHM3/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 SM8S15AHM3/I?
For technical support, including SM8S15AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S15AHM3/I requirements.
6.How does Aetrix verify that SM8S15AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S15AHM3/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 SM8S15AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S15AHM3/I?
All SM8S15AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S15AHM3/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 SM8S15AHM3/I part is unused and in its original packaging.
Return procedure for SM8S15AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S15AHM3/I Tags
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