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Vishay General Semiconductor - Diodes Division SM8S43-E3/2D
- Part No.:
- SM8S43-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S43-E3/2D.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,103
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Product details
Overview
SM8S43-E3/2D 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/24 V systems. It features a 43 V stand-off voltage (VWM), 76.7 V maximum clamping voltage (VC) at 86 A peak pulse current, and 6600 W peak pulse power (10/1000 μs), operating up to TJ = 175 °C.
For engineers reviewing the SM8S43-E3/2D datasheet, SM8S43-E3/2D pinout, SM8S43-E3/2D application, or SM8S43-E3/2D equivalent, key selection criteria include its AEC-Q101 qualification, DO-218AB package thermal performance (RθJC = 0.90 °C/W), ISO7637-2 compliance, and unidirectional polarity with heatsink-anode configuration.
Technical Context
The SM8S43-E3/2D employs passivated anisotropic rectifier technology optimized for junction stability under high-temperature transients. Its unidirectional architecture provides low forward voltage drop (VF ≤ 1.8 V at 100 A) and low reverse leakage (ID ≤ 10 μA at VWM = 43 V, TA = 25 °C).
It delivers 6600 W surge capability with 10/1000 μs waveform and sustains 5200 W with 10/10 000 μs waveform, meeting automotive load dump requirements per Fig. 2. Thermal design is enabled by direct metal heatsink mounting and MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins |
| VC @ IPPM | 76.7 V - Clamped voltage at 86 A peak pulse current ensures downstream ICs stay below safe breakdown thresholds |
| PPPM (10/1000 μs) | 6600 W - Enables robust protection against ISO 7637-2 Load Dump Pulse 5a/b without derating at TC = 25 °C |
| TJ max. | 175 °C - Supports under-hood automotive placement without thermal shutdown or parameter drift |
| RθJC | 0.90 °C/W - Enables efficient heat transfer to PCB copper or external heatsink for sustained 8 W power dissipation |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended, metal heatsink case with matte tin-plated leads; meets UL 94 V-0, J-STD-002 solderability, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to protected line (e.g., battery rail); primary current entry during clamping |
| Lead 2 / Metal Heatsink | Cathode | Electrically connected to cathode; serves as thermal and electrical return path to ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure reduces leakage drift over 175 °C lifetime operation |
| Low VF | ≤1.8 V at 100 A enables minimal conduction loss during surge events without overheating |
| High IPPM | 86 A (10/1000 μs) supports >6 kV system-level surge immunity in 12 V/24 V architectures |
| MSL Level 1 | Reflow-compatible up to 245 °C peak without preconditioning-enables standard SMT assembly |
Applications
| Automotive Power Distribution | Engine Control Unit (ECU) Protection |
|---|---|
Use Scenario: 12 V battery rail protection against alternator load dump transients in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤76.7 V, preventing damage to 45 V-rated input MOSFETs and LDOs while sustaining 6600 W surge energy. |
Use Scenario: Input protection for microcontroller-based ECUs exposed to inductive switching noise from fuel injectors and solenoids. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on main power supply rail upstream of PMIC. Use Value: AEC-Q101 qualification and 175 °C operation ensure functional safety compliance in under-hood environments with no derating required. |
| Commercial Vehicle Lighting Systems | Start-Stop System Battery Management |
Use Scenario: Protection of LED driver ICs and CAN transceivers in heavy-duty truck headlamp modules subjected to repeated load dump pulses. IC Role / Device Role / Timing Role: Standoff-clamp TVS directly mounted on high-current power traces near connector entry points. Use Value: DO-218AB metal heatsink enables direct thermal coupling to chassis ground, maintaining clamping performance across 10,000+ surge cycles. |
Use Scenario: Voltage clamping during engine restart in 12 V start-stop systems where battery voltage spikes exceed 35 V. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor integrated into BMS power input stage. Use Value: 43 V VWM aligns precisely with 12 V nominal + 25 % tolerance, avoiding false triggering while ensuring full clamping margin before 76.7 V VC limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/5AT | Lower PPPM (400 W vs. 6600 W); SMA package; RθJC ≈ 50 °C/W | Not suitable for load dump; limited to ESD/low-energy transients | Select only for board-level ESD protection where surge energy < 100 mJ |
| SM8S43A-E3/2D | Lower clamping voltage (69.4 V vs. 76.7 V); tighter VBR tolerance (±5 % vs. ±10 %) | Better for systems requiring lower clamping margin; same DO-218AB footprint | Prefer when downstream devices have < 70 V absolute maximum ratings |
Compared with SMAJ43A-E3/5AT, the SM8S43-E3/2D delivers 16.5× higher surge power handling and superior thermal management via DO-218AB; versus SM8S43A-E3/2D, it trades clamping voltage margin for broader VBR tolerance, making it more robust against manufacturing variation in high-volume automotive production.
Availability
SM8S43-E3/2D is available at Aetrix Electronics and suitable for automotive power distribution, engine control unit (ECU) protection, commercial vehicle lighting systems, and start-stop system battery management requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM8S43-E3/2D 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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM8S series is engineered specifically for automotive-grade transient suppression, targeting ISO7637-2 load dump compliance and AEC-Q101 qualification in harsh under-hood environments.
FAQ
What is the clamping voltage of the SM8S43-E3/2D at its rated peak pulse current?
The SM8S43-E3/2D has a maximum clamping voltage (VC) of 76.7 V when subjected to its rated 86 A peak pulse current (IPPM) under 10/1000 μs waveform conditions at TC = 25 °C. This value is measured per the test method defined in Vishay document 88387 and ensures downstream components remain within safe operating limits during automotive load dump events. The SM8S43-E3/2D maintains this clamping performance across its full operating temperature range.
Is the SM8S43-E3/2D suitable for bidirectional transient protection?
No, the SM8S43-E3/2D is unidirectional only, with polarity defined as anode on Lead 1 and cathode on the metal heatsink (Lead 2). It is not rated for reverse standoff or clamping in the opposite direction. For bidirectional protection, Vishay offers the SM8SxxCA series; the SM8S43-E3/2D must be installed with correct orientation relative to the protected line's DC bias. This limitation is explicitly stated in the "Polarity" note of the datasheet.
Does the SM8S43-E3/2D meet AEC-Q101 qualification?
Yes, the SM8S43-E3/2D is AEC-Q101 qualified, as confirmed in the "FEATURES" section and footnote (1) of Vishay document 88387. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock, validating its suitability for automotive powertrain and chassis applications. The HE3 suffix denotes RoHS compliance and AEC-Q101 qualification per the ordering information table.
What is the thermal resistance from junction to case (RθJC) for the SM8S43-E3/2D?
The SM8S43-E3/2D has a typical thermal resistance of 0.90 °C/W from junction to case (RθJC), measured under TC = 25 °C conditions. This low value is enabled by the DO-218AB package's direct metal heatsink construction, allowing efficient heat transfer to the PCB copper pour or external heatsink. This parameter is critical for calculating allowable power dissipation in high-temperature environments and is specified in the "THERMAL CHARACTERISTICS" table of the datasheet.
How does the SM8S43-E3/2D differ from the SM8S43A-E3/2D variant?
The SM8S43-E3/2D differs from the SM8S43A-E3/2D primarily in breakdown voltage tolerance and clamping performance: SM8S43 has VBR min/max of 47.8 V / 58.4 V (±10 %), while SM8S43A specifies 47.8 V / 52.8 V (±5 %); correspondingly, VC is 76.7 V vs. 69.4 V. Both share identical DO-218AB packaging, AEC-Q101 qualification, and 43 V VWM. The SM8S43-E3/2D offers wider tolerance for cost-sensitive high-volume production where tighter clamping is not required.
SM8S43-E3/2D 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:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 86A
- Power - Peak Pulse:
- 6600W (6.6kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM8S43-E3/2D FAQ
1.How can I place an order for SM8S43-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S43-E3/2D 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 SM8S43-E3/2D reliable?
The price and inventory of SM8S43-E3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S43-E3/2D is usually 5 days.
3.What payment methods are accepted for SM8S43-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S43-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S43-E3/2D?
SM8S43-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S43-E3/2D 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 SM8S43-E3/2D?
For technical support, including SM8S43-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S43-E3/2D requirements.
6.How does Aetrix verify that SM8S43-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S43-E3/2D 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 SM8S43-E3/2D meets industry standards.
7.What is the process for return or replacement of SM8S43-E3/2D?
All SM8S43-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S43-E3/2D, 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 SM8S43-E3/2D part is unused and in its original packaging.
Return procedure for SM8S43-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S43-E3/2D Tags
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