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Vishay General Semiconductor - Diodes Division SM8S14A-1HE3/2D
- Part No.:
- SM8S14A-1HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S14A-1HE3/2D.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
SM8S14A-1HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in high-reliability 12 V systems. It features a 15.6 V minimum breakdown voltage (VBR), 14.0 V maximum stand-off voltage (VWM), 284 A peak pulse current (IPPM) under 10/1000 μs waveform, and 23.2 V clamping voltage (VC) at rated surge - deployed across engine control units, body electronics, and infotainment power rails.
For engineers reviewing the SM8S14A-1HE3/2D datasheet, SM8S14A-1HE3/2D pinout, SM8S14A-1HE3/2D application, or SM8S14A-1HE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 0.90 °C/W), AEC-Q101 qualification, 175 °C junction rating, and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode operates as a clamping device in series with the power input path, activating above its VWM to shunt surge energy to ground while maintaining low leakage (<10 μA at VWM) and low forward voltage drop (<1.8 V at 100 A). Its passivated anisotropic rectifier structure enables stable operation up to TJ = 175 °C.
The DO-218AB package integrates a metal heatsink as the anode terminal, enabling direct thermal coupling to PCB copper or external heatsinks. It supports 6600 W peak pulse power (10/1000 μs) and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 15.6 V / 17.2 V - defines precise turn-on threshold range for reliable clamping onset without false triggering |
| VWM | 14.0 V - maximum continuous reverse operating voltage before leakage rises significantly |
| IPPM (10/1000 μs) | 284 A - peak surge current capability for automotive load dump events per ISO7637-2 |
| VC @ IPPM | 23.2 V - clamped voltage during full-rated surge, limiting downstream IC stress |
| TJ max. | 175 °C - enables placement near hot engine compartments without derating penalties |
| RθJC | 0.90 °C/W - allows efficient heat transfer from junction to case, critical for sustained surge handling |
| Polarity | Unidirectional - configured for DC power rail protection only (anode-to-ground orientation) |
Pinout & Package
Package: DO-218AB - surface-mount, thermally enhanced case with integral metal heatsink acting as anode terminal; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards; RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery feed); carries full surge current during clamping |
| Lead 2 / Metal Heatsink | Anode | Must be connected to system ground plane; serves as primary thermal path and electrical return |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier technology ensures stable VBR and low leakage over lifetime and temperature |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| ISO7637-2 compliance | Rated for load dump waveforms (10 ms exponential), enabling direct use in 12 V vehicle power systems |
| MSL Level 1 | Supports standard SMT reflow without moisture sensitivity concerns (peak 245 °C) |
| Low clamping ratio (VC/VBR) | 1.48 - tight voltage margin between turn-on and clamping improves system-level overvoltage margin |
Applications
| Engine Control Unit (ECU) Power Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller and CAN transceiver power inputs from alternator load dump surges during battery disconnection. IC Role / Device Role / Timing Role: Clamping TVS placed upstream of LDO regulators and PMICs to limit input voltage excursion. Use Value: Limits VIN to ≤23.2 V during 284 A transients, preventing latch-up or permanent damage to 28 V-rated downstream ICs. | Use Scenario: Shields door module logic and motor drivers from inductive switching spikes generated by window lifters and mirror actuators. IC Role / Device Role / Timing Role: Unidirectional TVS connected between fused +12 V rail and chassis ground. Use Value: Suppresses 100–200 V, 50–100 ms transients with <10 μA leakage at 14 V, preserving sleep-mode current budgets. |
| Infotainment Head Unit Power Input | ADAS Camera Power Rail Protection |
Use Scenario: Guards USB-C PD controller and display driver ICs against ignition-on transients and jump-start overvoltages. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input before buck converter stage. Use Value: Maintains 14.0 V stand-off with no conduction during normal operation, ensuring zero interference with power sequencing. | Use Scenario: Safeguards image sensor and serializer ICs in rear-view or surround-view cameras exposed to harsh under-hood environments. IC Role / Device Role / Timing Role: High-temperature-stable TVS mounted directly on camera PCB near connector entry point. Use Value: Operates reliably at TJ = 175 °C ambient, eliminating thermal derating in sealed enclosures near exhaust components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/5AT | Lower PPPM (400 W vs. 6600 W), SMA package (RθJC ≈ 40 °C/W), VC = 23.2 V same but IPPM = 17.3 A | Not suitable for load dump; limited to ESD and low-energy transients | Select only for non-automotive, low-surge consumer or industrial I/O protection |
| TPSMD14A | Same DO-218AB package, AEC-Q101 qualified, but VBR = 15.6–17.2 V identical; VC = 23.2 V, IPPM = 284 A - functionally identical surge rating | No difference; validated for same ISO7637-2 load dump profiles | Drop-in alternative with identical electrical and mechanical specs; dual-sourced for supply chain resilience |
Compared with SMAJ14A-E3/5AT, SM8S14A-1HE3/2D delivers 38× higher surge power handling and automotive-grade thermal robustness; versus TPSMD14A, it offers identical protection performance with second-source availability and shared qualification data.
Availability
SM8S14A-1HE3/2D is available at Aetrix Electronics and suitable for automotive ECU design, body electronics development, and ADAS camera module production requiring stable component supply and long-term lifecycle support.
Supply support for SM8S14A-1HE3/2D 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 SM8SxxA family is engineered specifically for high-energy automotive load dump suppression, combining AEC-Q101 reliability, DO-218AB thermal efficiency, and ISO7637-2 compliance in a single unidirectional TVS platform.
FAQ
What is the maximum clamping voltage of the SM8S14A-1HE3/2D under full-rated surge conditions?
The SM8S14A-1HE3/2D exhibits a maximum clamping voltage (VC) of 23.2 V when subjected to its rated 284 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM8S14A-1HE3/2D maintains this clamping performance across its full operating temperature range due to its passivated junction design.
Is the SM8S14A-1HE3/2D suitable for bidirectional transient protection?
No, the SM8S14A-1HE3/2D is strictly unidirectional and must be installed with its anode (metal heatsink) tied to ground and cathode (lead 1) connected to the protected line. It does not conduct in reverse bias beyond VWM = 14.0 V and provides no protection against negative-going transients. For bidirectional applications, a separate symmetric TVS or a dedicated bidirectional variant such as SM8S14CA would be required instead of the SM8S14A-1HE3/2D.
Does the SM8S14A-1HE3/2D require a heatsink beyond its integrated metal case?
The SM8S14A-1HE3/2D's DO-218AB package incorporates a large metal heatsink as the anode terminal, which serves as the primary thermal path. When mounted on ≥1 in² of 2-oz copper connected to ground, it achieves the specified RθJC = 0.90 °C/W and supports full 6600 W surge capability. Additional external heatsinking is unnecessary for standard automotive load dump events but may extend safe operating area during repeated surges or elevated ambient temperatures.
How does the SM8S14A-1HE3/2D meet AEC-Q101 requirements?
The SM8S14A-1HE3/2D is fully AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, humidity bias, and ESD (HBM ≥ 8 kV). Its construction uses junction passivation and anisotropic rectifier technology to ensure parameter stability over 1500+ hours of accelerated life testing at 175 °C. This qualification confirms suitability for automotive under-hood and cabin applications where reliability is mission-critical - a core requirement for the SM8S14A-1HE3/2D.
Can the SM8S14A-1HE3/2D be used in 24 V commercial vehicle systems?
No - the SM8S14A-1HE3/2D is rated for 14 V nominal systems (VWM = 14.0 V, VBR min = 15.6 V), making it unsuitable for 24 V systems where stand-off voltage must exceed 24 V. For 24 V commercial vehicles, higher-voltage variants such as SM8S28A-1HE3/2D (VWM = 28.0 V) or SM8S33A-1HE3/2D (VWM = 33.0 V) are appropriate. Using the SM8S14A-1HE3/2D in a 24 V environment would cause continuous conduction and catastrophic failure.
SM8S14A-1HE3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- 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-218AB
SM8S14A-1HE3/2D FAQ
1.How can I place an order for SM8S14A-1HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S14A-1HE3/2D 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-1HE3/2D reliable?
The price and inventory of SM8S14A-1HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S14A-1HE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S14A-1HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S14A-1HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S14A-1HE3/2D?
SM8S14A-1HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S14A-1HE3/2D 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-1HE3/2D?
For technical support, including SM8S14A-1HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S14A-1HE3/2D requirements.
6.How does Aetrix verify that SM8S14A-1HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S14A-1HE3/2D 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-1HE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S14A-1HE3/2D?
All SM8S14A-1HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S14A-1HE3/2D, 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-1HE3/2D part is unused and in its original packaging.
Return procedure for SM8S14A-1HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S14A-1HE3/2D Tags
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