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Vishay General Semiconductor - Diodes Division SM8S36A-71HE4_A/J
- Part No.:
- SM8S36A-71HE4_A/J
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S36A-71HE4_A/J.pdf
- Description:
- TVS DIODE 36VWM DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,792
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Product details
Overview
SM8S36A-71HE4_A/J from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 36 V stand-off voltage (VWM), 42.1 V nominal breakdown voltage (VBR), 58.1 V clamping voltage at 114 A peak pulse current, 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the SM8S36A-71HE4_A/J datasheet, SM8S36A-71HE4_A/J pinout, SM8S36A-71HE4_A/J application, or SM8S36A-71HE4_A/J equivalent, key selection criteria include its DO-218AB package thermal performance (RθJM = 0.35 °C/W), 175 °C junction rating, low leakage (<10 μA at VWM), and ISO7637-2 compliance for 12 V system load dump transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver high reliability under repetitive surge stress. Its unidirectional polarity and heatsink-as-anode configuration enable direct mounting to chassis ground in automotive power line protection circuits.
The device operates across -55 °C to +175 °C and maintains stable clamping performance up to maximum junction temperature, with a VBR temperature coefficient of +0.091 %/°C - critical for consistent overvoltage suppression in engine bay environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - reverse stand-off voltage; defines maximum continuous operating voltage before significant leakage begins |
| VBR (nom) | 42.1 V - nominal breakdown voltage at 5 mA test current; triggers clamping during transients |
| VC @ IPPM | 58.1 V - clamping voltage at 114 A peak pulse current; limits downstream voltage stress during load dump |
| PPPM (10/1000 μs) | 6600 W - peak pulse power handling; supports severe ISO7637-2 Pulse 5a load dump events |
| TJ max | +175 °C - maximum junction temperature; enables placement near high-heat sources like ECUs or alternators |
| RθJM | 0.35 °C/W - junction-to-mount thermal resistance; ensures efficient heat transfer to metal heatsink or PCB copper pour |
| Leakage @ VWM | <10 μA - low reverse leakage at rated stand-off; minimizes quiescent power loss in always-on systems |
Pinout & Package
Package: DO-218AB - molded surface-mount case with integral metal heatsink; anode terminal is the exposed metal base (heatsink), cathode is lead 1; meets UL 94 V-0 and JESD201 Class 2 whisker requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | Positive reference / Ground return path | Must be soldered to large copper area or chassis for thermal and electrical performance; serves as primary heat dissipation path |
| Cathode (Lead 1) | Transient voltage sensing and clamping node | Connected to protected line (e.g., battery rail); conducts surge current to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan |
| Junction passivation | Optimized anisotropic rectifier structure reduces parameter drift and enhances long-term stability under thermal cycling |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH; no bake required prior to reflow - simplifies SMT manufacturing |
| ISO7637-2 compliant | Withstands defined load dump waveforms (Pulse 5a) without degradation - verified per test condition 12 V system |
| Low forward voltage drop | ≤1.8 V at 100 A (300 μs pulse); minimizes conduction loss during high-current clamping events |
Applications
| Automotive Load Dump Protection | 12 V Battery Rail Surge Suppression |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) from alternator load dump transients during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ground, clamping voltage spikes within 100 ns. Use Value: Limits peak rail voltage to ≤58.1 V during 6600 W surges, preventing damage to 40 V-rated DC-DC converters and microcontrollers. | Use Scenario: Safeguarding infotainment head units and ADAS camera modules connected directly to vehicle battery. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input, coordinated with upstream fuses and downstream LC filters. Use Value: Maintains <10 μA leakage at 36 V, enabling low-power sleep mode operation while providing 114 A surge current capacity. |
| Start-Stop System Power Management | Commercial Vehicle Lighting Control |
Use Scenario: Securing microcontroller power supplies in vehicles with regenerative braking and frequent engine restart cycles. IC Role / Device Role / Timing Role: Fast-response transient suppressor on switched 12 V supply feeding CAN transceivers and sensor interfaces. Use Value: Withstands repeated 10/1000 μs surges up to 6600 W without parameter shift, supporting >100,000 start-stop cycles. | Use Scenario: Protecting LED driver ICs and MOSFET switches in heavy-duty truck lighting harnesses subject to cable inductance spikes. IC Role / Device Role / Timing Role: High-energy TVS mounted at lamp housing entry point, shunting inductive kickback from relay coils and solenoids. Use Value: 175 °C junction rating allows direct mounting on aluminum housings; RθJM = 0.35 °C/W ensures thermal survival during sustained 8 W dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S36AHM3 | Same VWM/VBR/VC specs; HM3 suffix indicates enhanced MSL1 robustness and updated material set per AEC-Q101 rev G | Identical load dump protection capability; preferred for new designs requiring latest qualification revision | Select SM8S36AHM3 for new automotive programs where long-term supply continuity and latest AEC-Q101 revision compliance are mandatory |
| SMAJ36A | Lower PPPM (400 W vs. 6600 W); DO-214AC package; RθJA ≈ 50 °C/W vs. DO-218AB's 0.35 °C/W RθJM | Suitable only for low-energy transients; cannot replace SM8S36A-71HE4_A/J in load dump scenarios | Use SMAJ36A only in non-automotive, low-surge industrial applications where peak power <500 W and thermal constraints permit |
Compared with SM8S36AHM3, the SM8S36A-71HE4_A/J shares identical electrical specs but lacks the latest AEC-Q101 revision and updated material categorization; compared with SMAJ36A, it delivers 16.5× higher surge power handling and superior thermal coupling - making it irreplaceable for automotive load dump duty.
Availability
SM8S36A-71HE4_A/J is available at Aetrix Electronics and suitable for automotive ECU protection, 12 V battery rail stabilization, and commercial vehicle lighting control requiring stable component supply across extended production lifecycles.
Supply support for SM8S36A-71HE4_A/J 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, and protection devices engineered for high-reliability industrial and automotive applications.
The SM8SxxA family was developed specifically for high-energy automotive load dump protection, combining DO-218AB thermal efficiency with AEC-Q101 qualification and ISO7637-2 compliance.
FAQ
What is the clamping voltage of SM8S36A-71HE4_A/J at its rated peak pulse current?
The SM8S36A-71HE4_A/J has a maximum clamping voltage (VC) of 58.1 V at 114 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per standard test methods and ensures downstream components see limited overvoltage during load dump events. The SM8S36A-71HE4_A/J maintains this clamping performance across its full operating temperature range.
Is SM8S36A-71HE4_A/J suitable for new automotive designs?
No - Vishay explicitly marks SM8S36A-71HE4_A/J as "Not For New Designs" and recommends SM8S36AHM3 as the alternative. While the SM8S36A-71HE4_A/J remains functional and qualified, new programs should use the HM3 variant to ensure alignment with current AEC-Q101 revision requirements and long-term supply assurance. The SM8S36A-71HE4_A/J is supported for legacy production only.
What does the "71HE4_A/J" suffix indicate in SM8S36A-71HE4_A/J?
The "71HE4_A/J" suffix encodes packaging and qualification data: "71" denotes tape-and-reel packaging per EIA-481; "H" confirms AEC-Q101 qualification; "E4" specifies RoHS-compliant, halogen-free, Pb-free termination; "A" is the revision code; and "/J" indicates Vishay's internal lot traceability format. This matches the ordering convention defined in Vishay document 88387.
How does the DO-218AB package of SM8S36A-71HE4_A/J improve thermal performance over standard SMC packages?
The DO-218AB package of SM8S36A-71HE4_A/J integrates a large metal heatsink as the anode terminal, achieving RθJM = 0.35 °C/W - over 100× better than typical RθJA of SMC packages. This enables direct thermal coupling to PCB copper or chassis, allowing the SM8S36A-71HE4_A/J to sustain 8 W continuous power dissipation and survive repeated 6600 W surges without thermal runaway.
Does SM8S36A-71HE4_A/J meet ISO7637-2 Pulse 5a requirements?
Yes - the SM8S36A-71HE4_A/J is specified to meet ISO7637-2 for load dump (Pulse 5a) under defined test conditions, with validated performance up to 6600 W (10/1000 μs) and 5200 W (10/10,000 μs). Its 58.1 V clamping voltage and 175 °C junction rating ensure reliable suppression of the 12 V system's worst-case 110 V, 400 ms exponential waveform.
SM8S36A-71HE4_A/J 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 114A
- 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
SM8S36A-71HE4_A/J FAQ
1.How can I place an order for SM8S36A-71HE4_A/J through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S36A-71HE4_A/J 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 SM8S36A-71HE4_A/J reliable?
The price and inventory of SM8S36A-71HE4_A/J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S36A-71HE4_A/J is usually 5 days.
3.What payment methods are accepted for SM8S36A-71HE4_A/J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S36A-71HE4_A/J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S36A-71HE4_A/J?
SM8S36A-71HE4_A/J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S36A-71HE4_A/J 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 SM8S36A-71HE4_A/J?
For technical support, including SM8S36A-71HE4_A/J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S36A-71HE4_A/J requirements.
6.How does Aetrix verify that SM8S36A-71HE4_A/J is sourced from the original manufacturer or authorized distributors?
All SM8S36A-71HE4_A/J 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 SM8S36A-71HE4_A/J meets industry standards.
7.What is the process for return or replacement of SM8S36A-71HE4_A/J?
All SM8S36A-71HE4_A/J units undergo pre-shipment inspection (PSI). If there is an issue with SM8S36A-71HE4_A/J, 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 SM8S36A-71HE4_A/J part is unused and in its original packaging.
Return procedure for SM8S36A-71HE4_A/J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S36A-71HE4_A/J Tags
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