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Vishay General Semiconductor - Diodes Division SM8S26A-71HE4_A/J
- Part No.:
- SM8S26A-71HE4_A/J
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S26A-71HE4_A/J.pdf
- Description:
- TVS DIODE 26VWM DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,265
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Product details
Overview
SM8S26A-71HE4_A/J from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 26 V stand-off voltage (VWM), 30.4 V nominal breakdown (VBR), and 6600 W peak pulse power (10/1000 μs). It delivers automotive-grade protection against load dump transients and inductive switching surges in 12 V/24 V vehicle power systems.
For engineers reviewing the SM8S26A-71HE4_A/J datasheet, SM8S26A-71HE4_A/J pinout, SM8S26A-71HE4_A/J application, or SM8S26A-71HE4_A/J equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C junction rating, 42.1 V clamping voltage at 157 A IPPM, and ISO7637-2 compliance for automotive load dump immunity.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM), low forward voltage drop (≤1.8 V at 100 A), and stable breakdown voltage with +0.088 %/°C temperature coefficient. Its DO-218AB package features a metal heatsink anode configuration optimized for high thermal conductivity and surge current handling.
The device operates across -55 °C to +175 °C, supports 700 A IFSM surge current (8.3 ms half-sine), and exhibits RθJM = 0.35 °C/W for efficient heat transfer to the PCB heatsink - critical for sustained reliability under repeated load dump events in engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold for 24 V automotive rails. |
| VBR (nom) | 30.4 V - Breakdown voltage at 5 mA test current; defines precise clamping initiation point with ±5 % tolerance for predictable protection behavior. |
| VC @ IPPM | 42.1 V - Clamping voltage at 157 A peak pulse current (10/1000 μs); ensures downstream ICs see <43 V during worst-case transients. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power capability; enables single-event suppression of ISO7637-2 Pulse 5a (load dump) without failure. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in under-hood environments and validates long-term reliability per AEC-Q101 stress tests. |
| ID @ VWM | ≤10 μA - Reverse leakage at 26 V and 25 °C; minimizes standby power loss in always-on vehicle modules like CAN gateways. |
| Package | DO-218AB - Surface-mount package with integrated metal heatsink anode; provides low-inductance path and 0.35 °C/W junction-to-mount thermal resistance. |
Pinout & Package
DO-218AB package with two terminals: anode connected to integral metal heatsink base, cathode as molded lead. Mounting requires thermal pad connection to PCB copper pour for optimal heat dissipation and surge current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Base) | Current return path and thermal interface | Must be soldered to ≥100 mm² copper area on PCB to maintain RθJM ≤ 0.35 °C/W and sustain 157 A IPPM without thermal runaway. |
| 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, limiting voltage to ≤42.1 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use via stress testing including HTGB, HTRB, TCT, and ESD - required for ECUs, ADAS, and body control modules. |
| Junction passivation | Optimized anisotropic rectifier structure reduces leakage drift over lifetime and improves stability at 175 °C junction temperature. |
| ISO7637-2 compliant | Meets Pulse 5a (load dump) requirements up to 35 V test level with 6600 W dissipation - eliminates need for external series impedance in many designs. |
| MSL Level 1 | Rated for reflow at 245 °C peak; compatible with standard SMT assembly without moisture sensitivity concerns or baking requirements. |
| Unidirectional polarity | Enables DC-biased rail protection only; avoids reverse conduction issues in battery-connected circuits where negative transients are not expected. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protection against alternator load dump transients (ISO7637-2 Pulse 5a) during battery disconnect in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Primary clamping element on main battery input; activates within nanoseconds to limit voltage to ≤42.1 V during 100–400 ms surges. Use Value: Prevents damage to MCU, CAN transceivers, and power management ICs by maintaining rail voltage below absolute maximum ratings during 35 V+ load dump events. |
Use Scenario: Surge suppression on always-on 12 V supply feeding microcontroller, EEPROM, and LIN transceivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Standby protection device; blocks leakage (<10 μA) during normal operation and clamps inductively coupled switching noise from window motors or solenoids. Use Value: Enables reliable low-power sleep mode operation while providing robust immunity to 150 A/10/1000 μs transients from nearby relay switching. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Input rail protection for 12 V–5 V DC/DC converters powering CMOS image sensors and ISP processors in surround-view cameras. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of LDOs and buck regulators; absorbs energy before it reaches sensitive analog front-ends. Use Value: Maintains clean 5 V output under load dump by limiting input overshoot to <42.1 V, preventing regulator dropout or sensor latch-up. |
Use Scenario: Protection of high-current 12 V supply feeding H-bridge gate drivers and current sense amplifiers in EPS motor control units. IC Role / Device Role / Timing Role: High-energy clamping device rated for 700 A IFSM; handles repetitive inductive kickback from brushed/BLDC motor commutation. Use Value: Extends system lifetime by absorbing >5000 cycles of 100 A/10/1000 μs pulses without parameter shift or thermal degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S26AHM3 | Same VWM (26 V), VBR (30.4 V), and DO-218AB package; differs in marking suffix (HM3 vs HE4) and revision code; identical electrical specs and AEC-Q101 qualification. | No functional difference; HM3 is Vishay's newer production variant with updated traceability and whisker-resistant plating (JESD201 Class 2). | Select SM8S26AHM3 for new designs requiring latest manufacturing revision and enhanced long-term tin whisker mitigation. |
| SMAJ26A | Lower PPPM (400 W vs 6600 W), smaller SMA package (RθJA = 95 °C/W vs 0.35 °C/W), no AEC-Q101 qualification, and 38.9 V clamping voltage at 100 A. | Not suitable for automotive load dump; limited to low-energy ESD and board-level transients in consumer or industrial equipment. | Use SMAJ26A only in non-automotive, low-surge applications where space constraints prohibit DO-218AB; avoid for ISO7637-2 compliance. |
Compared with SM8S26A-71HE4_A/J, SM8S26AHM3 offers identical protection performance with improved process control and whisker resistance, while SMAJ26A provides only 6 % of the surge capacity and lacks automotive qualification - making it unsuitable for load dump or AEC-Q101-requiring systems.
Availability
SM8S26A-71HE4_A/J is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS camera power, and electric power steering applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for SM8S26A-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM8SxxA family is designed specifically for high-energy automotive transient suppression, targeting load dump, inductive switching, and ISO7637-2 compliance in harsh under-hood environments.
FAQ
What is the clamping voltage of SM8S26A-71HE4_A/J at its rated peak pulse current?
The SM8S26A-71HE4_A/J has a maximum clamping voltage (VC) of 42.1 V at 157 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that protected circuitry remains below critical overvoltage thresholds during standardized automotive transients such as ISO7637-2 Pulse 5a. The SM8S26A-71HE4_A/J maintains this clamping performance across its full operating temperature range.
Is SM8S26A-71HE4_A/J qualified for automotive applications?
Yes, SM8S26A-71HE4_A/J is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments with junction temperatures up to +175 °C. It meets ISO7637-2 load dump requirements and is categorized under Vishay's automotive material compliance program (document #99912). The SM8S26A-71HE4_A/J is intended for safety-critical subsystems such as engine control units and ADAS power supplies.
What does the "HE4" suffix indicate in SM8S26A-71HE4_A/J?
The "HE4" suffix in SM8S26A-71HE4_A/J denotes RoHS-compliant, halogen-free construction (E3), AEC-Q101 qualification (H), and revision code "4" (E4). The "71" indicates packaging in 13-inch tape-and-reel with anode orientation toward sprocket holes. This full ordering code ensures traceability, environmental compliance, and correct mounting orientation during automated assembly of the SM8S26A-71HE4_A/J.
Can SM8S26A-71HE4_A/J replace older SM8S26A variants in existing designs?
SM8S26A-71HE4_A/J is functionally and electrically identical to prior SM8S26A revisions in the same DO-218AB package, including VWM (26 V), VBR (30.4 V), and VC (42.1 V). Mechanical footprint and thermal characteristics match exactly, enabling drop-in replacement without layout changes. However, Vishay designates this family as "Not For New Designs", recommending SM8S26AHM3 for future projects due to updated process controls.
What is the thermal resistance from junction to mount for SM8S26A-71HE4_A/J?
The SM8S26A-71HE4_A/J has a typical junction-to-mount thermal resistance (RθJM) of 0.35 °C/W when mounted per JEDEC 51-14 using the Transient Dual Interface Method. This low value is achieved via direct metal heatsink contact and requires soldering the anode base to ≥100 mm² of 2 oz. copper on the PCB. Proper thermal mounting ensures the SM8S26A-71HE4_A/J sustains repeated 157 A surges without exceeding 175 °C junction temperature.
SM8S26A-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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 157A
- 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
SM8S26A-71HE4_A/J FAQ
1.How can I place an order for SM8S26A-71HE4_A/J through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S26A-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 SM8S26A-71HE4_A/J reliable?
The price and inventory of SM8S26A-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 SM8S26A-71HE4_A/J is usually 5 days.
3.What payment methods are accepted for SM8S26A-71HE4_A/J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S26A-71HE4_A/J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S26A-71HE4_A/J?
SM8S26A-71HE4_A/J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S26A-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 SM8S26A-71HE4_A/J?
For technical support, including SM8S26A-71HE4_A/J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S26A-71HE4_A/J requirements.
6.How does Aetrix verify that SM8S26A-71HE4_A/J is sourced from the original manufacturer or authorized distributors?
All SM8S26A-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 SM8S26A-71HE4_A/J meets industry standards.
7.What is the process for return or replacement of SM8S26A-71HE4_A/J?
All SM8S26A-71HE4_A/J units undergo pre-shipment inspection (PSI). If there is an issue with SM8S26A-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 SM8S26A-71HE4_A/J part is unused and in its original packaging.
Return procedure for SM8S26A-71HE4_A/J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S26A-71HE4_A/J Tags
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