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Vishay General Semiconductor - Diodes Division SM8S14ATHE3/I
- Part No.:
- SM8S14ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S14ATHE3/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,825
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Product details
Overview
SM8S14ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 15.6 V to 17.2 V breakdown voltage (VBR), 14.0 V stand-off voltage (VWM), 284 A peak pulse current (IPPM), 23.2 V clamping voltage (VC), and 6600 W peak pulse power (10/1000 µs), operating up to 175 °C junction temperature in the DO-218AC package.
For engineers reviewing the SM8S14ATHE3/I datasheet, SM8S14ATHE3/I pinout, SM8S14ATHE3/I application, or SM8S14ATHE3/I equivalent, key selection criteria include its AEC-Q101 qualification, ISO7637-2 compliance for automotive transients, low leakage (<10 µA at TJ = 175 °C), unidirectional polarity with heatsink-as-anode configuration, and MSL Level 1 rating for high-reliability reflow assembly.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its DO-218AC package integrates a metal heatsink as the anode terminal, enabling efficient thermal dissipation with RθJC = 0.90 °C/W and continuous power dissipation of 8 W on an infinite heatsink.
The device is rated for 700 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits a positive temperature coefficient of VBR (αT = 0.078 %/°C), ensuring predictable voltage shift over temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow requirements (245 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 15.6 V / 16.4 V / 17.2 V - defines precise clamping onset threshold under 5 mA test current |
| VWM | 14.0 V - maximum continuous reverse operating voltage before significant leakage |
| VC @ IPPM | 23.2 V - clamped voltage during 284 A transient, limiting downstream IC stress |
| PPPM (10/1000 µs) | 6600 W - peak surge energy handling capability for automotive load dump events |
| TJ max. | 175 °C - enables operation in under-hood automotive environments without derating |
| ID @ VWM, TJ = 175 °C | <10 µA - ensures minimal standby power loss and signal integrity in always-on systems |
| RθJC | 0.90 °C/W - supports high-power transient absorption with low thermal resistance to heatsink |
Pinout & Package
Package: DO-218AC - thermally enhanced surface-mount outline with integral metal heatsink; anode connected to heatsink (lead 2), cathode at lead 1; RoHS-compliant matte tin plating; UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries full transient current into anode/heatsink |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical return; must be soldered to large copper area for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JEDEC standards |
| ISO7637-2 compliant | Withstands defined load dump waveforms (e.g., Pulse 5a) without degradation or failure |
| MSL Level 1 (245 °C) | Enables single-pass lead-free reflow without popcorn or delamination risk |
| Junction temperature rating: 175 °C | Eliminates derating in engine control units, battery management, and ADAS modules |
| Low VF = 1.8 V @ 100 A | Minimizes conduction losses during high-current surge events, reducing self-heating |
Applications
| Engine Control Unit (ECU) Protection | Automotive Battery Management System (BMS) |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceivers from alternator load dump transients during ignition cycling. IC Role / Device Role: Primary clamping element placed between battery rail and protected subsystem. Use Value: Limits voltage to 23.2 V during 6600 W surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. | Use Scenario: Shields cell monitor ICs and isolation amplifiers from voltage spikes during high-current charge/discharge switching. IC Role / Device Role: Front-end transient suppressor on main HV bus input to BMS controller board. Use Value: Withstands 700 A forward surge (8.3 ms) and maintains <10 µA leakage at 175 °C, ensuring accuracy in high-temp battery enclosures. |
| ADAS Camera Power Input | Electric Power Steering (EPS) Module |
Use Scenario: Safeguards image sensor and serializer ICs against transients induced by nearby motor actuation in surround-view systems. IC Role / Device Role: Unidirectional TVS on 12 V camera module input, mounted directly to heatsink plane. Use Value: Clamps within 23.2 V while dissipating 6600 W, preserving signal integrity and avoiding reset events in real-time vision processing. | Use Scenario: Guards motor driver gate drivers and position sensors from inductive kickback during EPS assist torque modulation. IC Role / Device Role: High-energy suppression device on 12 V supply rail upstream of DC-DC converters. Use Value: Delivers 0.90 °C/W thermal resistance and 175 °C operation, enabling compact layout without forced air cooling. |
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 VBR/VC/PPPM specs; HM3 suffix indicates halogen-free, matte tin finish, and enhanced whisker resistance vs. HE3 | Identical automotive use cases; HM3 offers tighter process control for safety-critical modules requiring extended whisker testing | Select HM3 for new designs targeting long-term supply continuity and stricter material compliance |
| SMAJ14A | Lower PPPM = 400 W (10/1000 µs); DO-214AC package; no AEC-Q101 qualification; RθJC ≈ 35 °C/W | Limited to non-automotive, lower-energy industrial or consumer applications; unsuitable for load dump | Only consider SMAJ14A where surge energy ≤400 W and automotive qualification is not required |
Compared with SM8S14ATHE3/I, SM8S14AHM3 provides identical protection performance with improved material reliability, while SMAJ14A offers only 6% of the surge capacity and lacks automotive qualification-making it inappropriate for load dump or under-hood deployment.
Availability
SM8S14ATHE3/I is available at Aetrix Electronics and suitable for automotive engine control units, battery management systems, ADAS camera modules, and electric power steering modules requiring stable component supply across extended temperature and high-surge environments.
Supply support for SM8S14ATHE3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM8SxxAT family is engineered specifically for automotive load dump protection, combining high-temperature operation, ISO7637-2 compliance, and robust thermal design to replace older TVS solutions in next-generation vehicle electronics.
FAQ
What is the primary function of the SM8S14ATHE3/I in automotive circuits?
The SM8S14ATHE3/I functions as a unidirectional transient voltage suppressor that clamps high-energy load dump transients-such as those from alternator regulation failure-to a safe 23.2 V level. It protects sensitive downstream ICs like MCUs, CAN transceivers, and sensor interfaces in engine control units and battery management systems by diverting up to 284 A of surge current away from vulnerable nodes.
Is the SM8S14ATHE3/I qualified for automotive use, and what standards does it meet?
Yes, the SM8S14ATHE3/I is AEC-Q101 qualified and meets ISO7637-2 Pulse 5a load dump requirements. It also complies with J-STD-020 MSL Level 1 (245 °C peak reflow), JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability standards-making it suitable for under-hood and safety-critical automotive applications.
How does the DO-218AC package of the SM8S14ATHE3/I improve thermal performance compared to standard SMC packages?
The DO-218AC package integrates a large metal heatsink as the anode terminal, achieving a junction-to-case thermal resistance of just 0.90 °C/W-over 35× better than typical DO-214AB (SMC) packages (~35 °C/W). This allows the SM8S14ATHE3/I to sustain 6600 W surges without thermal runaway when properly mounted to a PCB copper pour or external heatsink.
What is the significance of the HE3 suffix in SM8S14ATHE3/I?
HE3 denotes a RoHS-compliant, AEC-Q101-qualified variant with matte tin-plated leads meeting J-STD-002 solderability and JESD22-B102 intermetallic growth requirements. The "I" suffix specifies packaging in 13-inch plastic tape and reel (750 units), with anode oriented toward sprocket holes for automated placement.
Why is the SM8S14ATHE3/I marked 'Not For New Designs', and what should designers use instead?
Vishay designates SM8S14ATHE3/I as Not For New Designs because the newer SM8S14AHM3 offers identical electrical specs with enhanced material reliability-including halogen-free construction and stricter whisker resistance (JESD201 Class 2). Designers should migrate to SM8S14AHM3 for all new projects to ensure long-term supply and compliance alignment, while SM8S14ATHE3/I remains supported for legacy production.
SM8S14ATHE3/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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- 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-218AC
SM8S14ATHE3/I FAQ
1.How can I place an order for SM8S14ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S14ATHE3/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 SM8S14ATHE3/I reliable?
The price and inventory of SM8S14ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S14ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S14ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S14ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S14ATHE3/I?
SM8S14ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S14ATHE3/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 SM8S14ATHE3/I?
For technical support, including SM8S14ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S14ATHE3/I requirements.
6.How does Aetrix verify that SM8S14ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S14ATHE3/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 SM8S14ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S14ATHE3/I?
All SM8S14ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S14ATHE3/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 SM8S14ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S14ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S14ATHE3/I Tags
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