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Vishay General Semiconductor - Diodes Division SM8S43AHE3/2D
- Part No.:
- SM8S43AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S43AHE3/2D.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,132
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Product details
Overview
SM8S43AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in 43 V systems. It features a 47.8 V minimum breakdown voltage (VBR), 69.4 V maximum clamping voltage (VC) at 95.1 A peak pulse current, 6600 W peak pulse power (10/1000 µs), 175 °C junction temperature rating, and DO-218AB package with anode-heatsink polarity.
For engineers reviewing the SM8S43AHE3/2D datasheet, SM8S43AHE3/2D pinout, SM8S43AHE3/2D application, or SM8S43AHE3/2D equivalent, key selection criteria include clamping performance under ISO 7637-2 load dump waveforms, AEC-Q101 qualification status, thermal resistance (RθJC = 0.90 °C/W), and unidirectional polarity compatibility with 12 V/24 V/42 V automotive power rails.
Technical Context
The SM8S43AHE3/2D operates as a unidirectional avalanche diode with passivated anisotropic rectifier technology, enabling stable clamping up to TJ = 175 °C. Its DO-218AB package integrates a metal heatsink terminal that serves as the anode and primary thermal path, delivering RθJC = 0.90 °C/W for high-power transient dissipation.
It meets ISO 7637-2 surge requirements for automotive load dump events and complies with MSL Level 1 (J-STD-020) and JESD201 Class 2 whisker testing. The device exhibits ≤10 µA reverse leakage at VWM = 43 V and ≤15 µA at TJ = 175 °C, supporting robust long-term reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 47.8 V / 52.8 V - defines minimum voltage at which avalanche conduction begins reliably under 5 mA test current |
| VWM | 43 V - maximum continuous reverse operating voltage before significant leakage onset |
| VC @ IPPM | 69.4 V at 95.1 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPM (10/1000 µs) | 6600 W - peak transient power handling capability without failure |
| TJ max. | 175 °C - enables operation in under-hood automotive locations without derating |
| RθJC | 0.90 °C/W - low thermal resistance from junction to case supports high-power pulse dissipation into heatsink |
| AEC-Q101 | Qualified - certified for automotive-grade reliability per stress test standard |
Pinout & Package
Package: DO-218AB - surface-mount, anode-heatsink configuration with matte tin-plated leads; meets UL 94 V-0, MSL Level 1, and JESD201 Class 2 whisker requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Signal-side connection; carries transient current into device during clamping |
| Lead 2 / Metal Heatsink | Anode | Primary thermal and electrical return path; must be connected to system ground plane or heatsink for optimal power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage over lifetime and temperature |
| 175 °C operation | Enables direct placement near high-temperature engine control units without external thermal derating |
| ISO 7637-2 compliance | Validated for load dump transients up to 10 ms exponential waveform, critical for 12 V/24 V vehicle architectures |
| Low RθJC | 0.90 °C/W allows >8 W steady-state dissipation on infinite heatsink, supporting sustained clamp duty cycles |
| AEC-Q101 qualification | Confirms reliability across temperature cycling, humidity, mechanical shock, and HTRB stress tests for automotive use |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Load Dump Suppression |
|---|---|
Use Scenario: Protects microcontroller power rails from 12 V battery line transients during alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamps voltage spikes to ≤69.4 V within nanoseconds, preventing overvoltage damage to downstream DC/DC converters and LDOs. Use Value: Maintains system uptime by absorbing up to 6600 W of transient energy without degradation, validated per ISO 7637-2 Pulse 5a/b. |
Use Scenario: Shields BCM power inputs during switching of high-current loads like headlights, HVAC fans, and window motors. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp on 12 V supply rail, conducting surge current through metal heatsink terminal to chassis ground. Use Value: Enables compact layout with integrated thermal path (RθJC = 0.90 °C/W), eliminating need for discrete heatsinks in space-constrained modules. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Rail | Electric Power Steering (EPS) ECU Transient Suppression |
Use Scenario: Safeguards image sensor and ISP power supplies against coupled transients from nearby motor drivers and solenoids. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS limits voltage excursions to <70 V during 10/1000 µs surges, preserving signal integrity in high-speed video interfaces. Use Value: Low leakage (<10 µA at 43 V) prevents quiescent current increase in always-on camera modules, extending sleep-mode battery life. |
Use Scenario: Protects EPS motor driver ICs and MCU power domains from inductive kickback during steering actuation. IC Role / Device Role / Timing Role: Clamps reverse transients induced by 3-phase BLDC motor commutation, routing energy safely to chassis via heatsink terminal. Use Value: AEC-Q101 qualification ensures functional safety compliance for ASIL-B systems, supporting ISO 26262 hardware confidence levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3/A | Lower PPPM (400 W), SMA package, RθJC ≈ 45 °C/W, same VWM/VBR range | Not suitable for load dump; limited to low-energy ESD/surge events in non-automotive consumer electronics | Select only for cost-sensitive, low-power applications where 6600 W capability is unnecessary |
| TPSMD43A | Same DO-218AB package, 6600 W rating, but VC = 72.7 V at 95 A and no AEC-Q101 qualification | Lacks automotive qualification; requires additional validation for under-hood deployment | Consider for industrial 43 V systems where AEC-Q101 is not mandated and higher clamping voltage is acceptable |
Compared with SMAJ43AHE3/A and TPSMD43A, the SM8S43AHE3/2D uniquely combines AEC-Q101 qualification, 6600 W surge capacity, and 69.4 V clamping in a thermally optimized DO-218AB package-making it the only drop-in solution for production automotive load dump protection without layout or qualification compromise.
Availability
SM8S43AHE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power systems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM8S43AHE3/2D 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM8SxxA series is part of Vishay's PAR® TVS platform, engineered specifically for automotive load dump and ISO 7637-2 transient suppression in 12 V/24 V/42 V power networks.
FAQ
What is the clamping voltage of the SM8S43AHE3/2D at its rated peak pulse current?
The SM8S43AHE3/2D has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 95.1 A under a 10/1000 µs waveform. This value is measured per the conditions specified in the Vishay datasheet document 88387, revision 31-Aug-16, and defines the upper voltage limit imposed on protected circuits during worst-case surge events. The SM8S43AHE3/2D maintains this clamping performance across its full operating temperature range up to 175 °C.
Is the SM8S43AHE3/2D qualified for automotive applications?
Yes, the SM8S43AHE3/2D is AEC-Q101 qualified, as confirmed in the Vishay datasheet (document 88387). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, humidity bias, and accelerated life testing-ensuring suitability for under-hood and safety-critical automotive systems. The SM8S43AHE3/2D also meets ISO 7637-2 for load dump immunity and MSL Level 1 for moisture sensitivity.
What is the thermal resistance from junction to case for the SM8S43AHE3/2D?
The SM8S43AHE3/2D has a typical thermal resistance from junction to case (RθJC) of 0.90 °C/W, as published in the Vishay datasheet. This low value is enabled by the DO-218AB package's integrated metal heatsink terminal (anode), which provides a direct thermal path to the PCB copper pour or external heatsink. The SM8S43AHE3/2D leverages this to sustain 8 W of continuous power dissipation on an infinite heatsink at TC = 25 °C.
Does the SM8S43AHE3/2D have bidirectional polarity?
No, the SM8S43AHE3/2D is unidirectional only, as explicitly stated in the Vishay datasheet under FEATURES. Its polarity is fixed: Lead 1 is the cathode and Lead 2 (metal heatsink) is the anode. This configuration supports clamping only on positive transients relative to ground and is optimized for 12 V/24 V automotive supply rail protection. The SM8S43AHE3/2D does not conduct or clamp negative-going surges.
What packaging format is used for the SM8S43AHE3/2D?
The SM8S43AHE3/2D is supplied in 13" diameter plastic tape and reel, with 750 units per reel, and anode orientation toward the sprocket hole (ordering code "2D"). This packaging complies with J-STD-002 and JESD22-B102 for solderability and meets MSL Level 1 per J-STD-020, allowing unlimited floor life at ≤30 °C/60 % RH. The SM8S43AHE3/2D's DO-218AB outline is fully defined in the datasheet with mechanical dimensions in both inches and millimeters.
SM8S43AHE3/2D 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 95.1A
- 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
SM8S43AHE3/2D FAQ
1.How can I place an order for SM8S43AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S43AHE3/2D 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 SM8S43AHE3/2D reliable?
The price and inventory of SM8S43AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S43AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S43AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S43AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S43AHE3/2D?
SM8S43AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S43AHE3/2D 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 SM8S43AHE3/2D?
For technical support, including SM8S43AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S43AHE3/2D requirements.
6.How does Aetrix verify that SM8S43AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S43AHE3/2D 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 SM8S43AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S43AHE3/2D?
All SM8S43AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S43AHE3/2D, 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 SM8S43AHE3/2D part is unused and in its original packaging.
Return procedure for SM8S43AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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