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Vishay General Semiconductor - Diodes Division SM8S14A-1HE3_A/I
- Part No.:
- SM8S14A-1HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S14A-1HE3_A/I.pdf
- Description:
- TVS DIODE 14VWM DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,484
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Product details
Overview
SM8S14A-1HE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 14.0 V stand-off voltage, 15.6–17.2 V breakdown at 5 mA, 23.2 V clamping at 284 A (10/1000 μs), and 6600 W peak pulse power. It delivers automotive-grade protection against load dump and inductive switching transients.
For engineers reviewing the SM8S14A-1HE3_A/I datasheet, SM8S14A-1HE3_A/I pinout, SM8S14A-1HE3_A/I application, or SM8S14A-1HE3_A/I equivalent, this page provides verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJM = 0.35 °C/W), DO-218AB mechanical dimensions, and direct alternatives for legacy design continuity.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM, TJ = 175 °C) and low forward voltage drop (≤1.8 V at 100 A). Its junction temperature rating of –55 °C to +175 °C supports under-hood automotive environments.
The device meets ISO 7637-2 surge requirements for load dump protection and complies with MSL Level 1 (245 °C reflow peak). Its DO-218AB package features a metal heatsink acting as the anode terminal, enabling high thermal conductivity and robust surge handling without external heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 15.6 / 16.4 / 17.2 V at 5 mA - Ensures reliable triggering above system nominal voltage with ±5% tolerance |
| VC @ IPPM | 23.2 V at 284 A (10/1000 μs) - Limits downstream voltage during worst-case surge events |
| PPPM (10/1000 μs) | 6600 W - Sustains high-energy transients typical of 12 V automotive load dump |
| TJ max | +175 °C - Enables operation in engine compartment environments without derating |
| RθJM | 0.35 °C/W - Low junction-to-mount thermal resistance enables efficient heat transfer to PCB copper or heatsink |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTGB, HTRB, and temperature cycling |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-connected metal heatsink case, RoHS-compliant matte tin-plated leads, UL 94 V-0 molding compound, JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | High-current return path and thermal interface | Acts as primary current sink during clamping; must be connected to large copper pour or heatsink for thermal management |
| Cathode (Lead 1) | Transient voltage sensing and clamping node | Connected to protected line (e.g., battery rail); reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable leakage performance (<10 μA at 175 °C) and long-term reliability in harsh environments |
| DO-218AB metal heatsink | Provides direct thermal path from junction to PCB, reducing RθJM to 0.35 °C/W for sustained surge handling |
| ISO 7637-2 compliance | Validated for automotive load dump waveforms (including 10 ms exponential), supporting OEM-level ECU protection |
| AEC-Q101 qualification | Covers stress tests including HTGB (1000 hrs @ 150 °C), HTRB (1000 hrs @ 150 °C, 1.1×VRWM), and temperature cycling (–55 °C to +175 °C) |
Applications
| Automotive Load Dump Protection | Industrial Power Supply Input Protection |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) from 12 V battery line transients during alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and input filter capacitor, responding within nanoseconds to clamp voltage spikes up to 6600 W. Use Value: Prevents damage to downstream DC/DC converters and microcontrollers by limiting peak voltage to 23.2 V during 284 A surges. | Use Scenario: Safeguarding industrial PLC power inputs against inductive switching transients from solenoids, relays, and motor drivers. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor installed at main 24 V supply entry point, absorbing repetitive surges without degradation. Use Value: Maintains ≤10 μA leakage at full operating temperature (175 °C), ensuring minimal standby power loss in always-on systems. |
| Automotive Lighting Systems | Heavy-Duty Vehicle Battery Management |
Use Scenario: Shielding LED headlamp drivers and adaptive front-lighting systems (AFS) from ignition-induced transients and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input stage, leveraging fast response and low clamping ratio (VC/VBR ≈ 1.41). Use Value: Clamps 10/1000 μs surges at 23.2 V while sustaining 700 A non-repetitive forward surge current for robustness against repeated events. | Use Scenario: Protecting BMS monitoring circuits in commercial trucks and construction equipment exposed to wide ambient temperature swings and vibration. IC Role / Device Role / Timing Role: High-temperature-stable TVS mounted directly on battery feed-through board, using metal heatsink for passive thermal dissipation. Use Value: Operates continuously from –55 °C to +175 °C with no derating, eliminating need for active cooling or thermal margin padding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S14AHM3 | Same VWM, VBR, and PPPM; HM3 suffix indicates enhanced AEC-Q101 screening and tighter parameter binning | Preferred for new automotive designs requiring latest qualification level and extended lifetime data | Select SM8S14AHM3 when designing new platforms where long-term supply assurance and extended reliability validation are required |
| SMAJ14A | Lower PPPM (400 W vs. 6600 W), DO-214AC package, no metal heatsink, RθJM not specified | Suitable only for low-energy transients (e.g., ESD, signal-line protection), not load dump | Use SMAJ14A only in non-automotive, low-power applications where surge energy is below 500 W |
Compared with SM8S14A-1HE3_A/I, SM8S14AHM3 offers identical electrical specs with upgraded qualification rigor, while SMAJ14A lacks the thermal and surge capability needed for automotive battery rail protection - making SM8S14A-1HE3_A/I irreplaceable for high-energy load dump scenarios.
Availability
SM8S14A-1HE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and heavy-duty vehicle systems requiring stable component supply and long-lifecycle support.
Supply support for SM8S14A-1HE3_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, MOSFETs, and protection devices with emphasis on automotive, industrial, and computing applications.
The SM8S series is designed specifically for high-energy transient suppression in 12 V and 24 V automotive systems, targeting load dump, inductive switching, and ISO 7637-2 compliance without external thermal management.
FAQ
What is the maximum clamping voltage of the SM8S14A-1HE3_A/I under a 10/1000 μs surge?
The SM8S14A-1HE3_A/I has a maximum clamping voltage (VC) of 23.2 V at 284 A under a 10/1000 μs waveform. This value is measured per standard test conditions and ensures downstream components remain within safe operating voltage limits during high-energy transients. The SM8S14A-1HE3_A/I achieves this with minimal voltage overshoot due to its optimized junction passivation and low dynamic impedance.
Is the SM8S14A-1HE3_A/I qualified for automotive use?
Yes, the SM8S14A-1HE3_A/I is AEC-Q101 qualified and rated for operation from –55 °C to +175 °C. It passes rigorous automotive reliability tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling. The SM8S14A-1HE3_A/I is explicitly intended for under-hood and battery-rail applications in passenger and commercial vehicles.
What does the "HE3_A/I" suffix mean in SM8S14A-1HE3_A/I?
The "HE3" suffix denotes RoHS-compliant, halogen-free, lead-free termination with JESD201 Class 2 whisker resistance; "A" is the revision code; "I" indicates tape-and-reel packaging (750 units per 13″ reel, anode toward sprocket hole). The "1" in "SM8S14A-1" is a variant identifier consistent with Vishay's ordering nomenclature for the SM8S14A family. This exact marking appears on the device body.
Can the SM8S14A-1HE3_A/I replace the SMAJ14A in automotive applications?
No - the SM8S14A-1HE3_A/I cannot be replaced by SMAJ14A in automotive load dump applications. SMAJ14A has only 400 W peak pulse power versus 6600 W for SM8S14A-1HE3_A/I, lacks AEC-Q101 qualification, and uses DO-214AC instead of DO-218AB. Using SMAJ14A would result in catastrophic failure during ISO 7637-2 load dump testing. The SM8S14A-1HE3_A/I is purpose-built for this energy class.
Does the SM8S14A-1HE3_A/I meet ISO 7637-2 requirements?
Yes, the SM8S14A-1HE3_A/I meets ISO 7637-2 surge specifications for Pulse 5a (load dump) under defined test conditions. Its 6600 W peak pulse power and 23.2 V clamping voltage enable compliance with the 12 V system requirements of the standard. Test reports confirming ISO 7637-2 conformance are available in Vishay's application documentation for the SM8S14A-1HE3_A/I.
SM8S14A-1HE3_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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 284A
- 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
SM8S14A-1HE3_A/I FAQ
1.How can I place an order for SM8S14A-1HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S14A-1HE3_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 SM8S14A-1HE3_A/I reliable?
The price and inventory of SM8S14A-1HE3_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 SM8S14A-1HE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S14A-1HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S14A-1HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S14A-1HE3_A/I?
SM8S14A-1HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S14A-1HE3_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 SM8S14A-1HE3_A/I?
For technical support, including SM8S14A-1HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S14A-1HE3_A/I requirements.
6.How does Aetrix verify that SM8S14A-1HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S14A-1HE3_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 SM8S14A-1HE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S14A-1HE3_A/I?
All SM8S14A-1HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S14A-1HE3_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 SM8S14A-1HE3_A/I part is unused and in its original packaging.
Return procedure for SM8S14A-1HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S14A-1HE3_A/I Tags
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