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Vishay General Semiconductor - Diodes Division SM6S26ATHE3/I
- Part No.:
- SM6S26ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S26ATHE3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,398
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Product details
Overview
SM6S26ATHE3/I 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 26 V stand-off voltage (VWM), 30.4 V nominal breakdown voltage (VBR), 42.1 V clamping voltage at 109 A peak pulse current, 4600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for operation up to TJ = 175 °C.
For engineers reviewing the SM6S26ATHE3/I datasheet, SM6S26ATHE3/I pinout, SM6S26ATHE3/I application, or SM6S26ATHE3/I equivalent, this device is selected for high-surge, high-temperature automotive power rail protection where low leakage (<10 μA at VWM), low forward voltage drop (<1.9 V @ 100 A), and DO-218AC package thermal performance are critical design requirements.
Technical Context
The SM6S26ATHE3/I employs passivated anisotropic rectifier technology optimized for junction stability under repetitive surge stress. Its unidirectional polarity configures the metal heatsink as the anode terminal, enabling direct thermal coupling to PCB copper planes for enhanced power dissipation.
It meets ISO 7637-2 load dump surge requirements with validated 10 ms exponential waveform capability up to 3600 W (10/10,000 μs) and supports MSL Level 1 reflow (245 °C peak) with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines system working voltage margin. |
| VBR (nom) | 30.4 V - Breakdown voltage at 5 mA test current; ensures reliable turn-on during transients above normal rail. |
| VC @ IPPM | 42.1 V - Clamping voltage at 109 A (10/1000 μs); limits downstream IC stress during worst-case surge events. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling; enables robust protection against ISO 7637-2 Pulse 5a load dump surges. |
| TJ max | 175 °C - Maximum junction temperature; supports under-hood automotive placement without derating penalties. |
| ID @ VWM | <10 μA - Reverse leakage at rated stand-off; minimizes quiescent power loss in always-on vehicle modules. |
| RθJC | 0.95 °C/W - Junction-to-case thermal resistance; enables effective heat transfer to heatsinked PCB pads. |
Pinout & Package
Package: DO-218AC - Surface-mount, thermally enhanced case with integral metal heatsink (anode terminal). Meets UL 94 V-0, MSL Level 1, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Signal-side connection; carries transient current into protected circuit node during clamping. |
| Lead 2 / Metal Heatsink | Anode | Ground/reference plane connection; serves as primary thermal path and electrical return for surge current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JEDEC standards. |
| Junction passivation | Optimized anisotropic rectifier structure reduces parameter drift over lifetime and improves surge consistency. |
| Low VF @ 100 A | <1.9 V forward voltage drop ensures minimal conduction loss during high-current load dump events. |
| ISO 7637-2 compliance | Tested to Pulse 5a (load dump) with 10 ms exponential waveform - directly applicable to 12 V/24 V vehicle systems. |
| MSL Level 1 rating | Supports single-reflow assembly at 245 °C peak without moisture-induced damage or delamination. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protection of 12 V supply inputs against alternator load dump transients during battery disconnect/reconnect cycles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed upstream of DC/DC converters and LDOs to limit input voltage excursion. Use Value: Clamps to 42.1 V at 109 A, preventing overvoltage damage to sensitive MCU and analog front-end circuitry while maintaining <10 μA leakage at 26 V. |
Use Scenario: Surge suppression on main 24 V power rail in diesel engine control units exposed to high-energy load dumps. IC Role / Device Role / Timing Role: Primary transient shunt element mounted directly to chassis ground via heatsink pad for lowest possible impedance path. Use Value: Delivers 4600 W (10/1000 μs) and 3600 W (10/10,000 μs) surge capacity with 0.95 °C/W thermal resistance to sustain repeated events without thermal runaway. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) ECU |
Use Scenario: Input protection for image sensor and ISP power rails in rear-view or surround-view cameras subject to vehicle-level ESD and load dump coupling. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp ensuring sub-100 ns turn-on to protect low-voltage logic supplies. Use Value: Maintains 26 V stand-off with <10 μA leakage to avoid signal integrity degradation while clamping to 42.1 V within nanoseconds of surge onset. |
Use Scenario: High-reliability transient suppression on motor driver power stage inputs in safety-critical EPS systems. IC Role / Device Role / Timing Role: Thermally anchored TVS absorbing energy from inductive kickback and load dump events across extended temperature range. Use Value: Rated for TJ = 175 °C operation and qualified to AEC-Q101, enabling uninterrupted function in under-hood environments exceeding 125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S26AHM3 | Same VWM (26 V), VBR (30.4 V), and VC (42.1 V); differs in packaging (HM3 = halogen-free, RoHS-compliant tape-and-reel with different orientation). | No functional difference in circuit behavior; HM3 variant replaces HE3 for new designs per Vishay's "Not For New Designs" notice. | Select SM6S26AHM3 for new designs requiring updated environmental compliance and long-term supply continuity. |
| SMAJ26A | Lower PPPM (400 W vs. 4600 W), higher RθJC (35 °C/W vs. 0.95 °C/W), same DO-214AC package (not DO-218AC), no AEC-Q101 qualification. | Not suitable for automotive load dump; limited to low-energy ESD or inductive switching protection in industrial/commercial systems. | Use SMAJ26A only in non-automotive, lower-surge applications where cost or footprint constraints outweigh thermal and reliability requirements. |
Compared with SM6S26AHM3, the SM6S26ATHE3/I offers identical electrical performance but lacks halogen-free certification and newer tape orientation; compared with SMAJ26A, it delivers 11.5× higher surge power, 36× better thermal resistance, and full AEC-Q101 qualification - making it irreplaceable for automotive load dump duty.
Availability
SM6S26ATHE3/I is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, ADAS camera power supplies, and electric power steering ECUs requiring stable component supply under AEC-Q101-compliant sourcing.
Supply support for SM6S26ATHE3/I 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 SM6S26ATHE3/I belongs to Vishay's PAR® family of high-power TVS diodes, engineered specifically for automotive-grade load dump and ISO 7637-2 surge immunity in harsh-temperature environments.
FAQ
What is the maximum clamping voltage of the SM6S26ATHE3/I at its rated peak pulse current?
The SM6S26ATHE3/I has a maximum clamping voltage (VC) of 42.1 V when subjected to its specified peak pulse current (IPPM) of 109 A under the 10/1000 μs waveform condition. This value is measured at TC = 25 °C and ensures downstream circuitry remains within safe operating voltage limits during standardized surge events. The SM6S26ATHE3/I maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient (0.088 %/°C).
Is the SM6S26ATHE3/I qualified for automotive applications?
Yes, the SM6S26ATHE3/I is AEC-Q101 qualified and explicitly intended for automotive use, including under-hood applications. It meets ISO 7637-2 load dump requirements, operates up to TJ = 175 °C, and carries the HE3 suffix denoting RoHS compliance and AEC-Q101 qualification. The SM6S26ATHE3/I is referenced in Vishay's documentation as part of the automotive-qualified SM6SxxAT series.
What does the "HE3" suffix mean in SM6S26ATHE3/I?
The "HE3" suffix in SM6S26ATHE3/I indicates RoHS-compliant construction, AEC-Q101 qualification, and compliance with JESD 201 Class 2 whisker resistance testing. It also specifies matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. The "I" denotes packaging in 13-inch plastic tape and reel with anode oriented toward the sprocket hole - a detail confirmed in Vishay's ordering information table for SM6S26ATHE3/I.
What is the thermal resistance from junction to case for the SM6S26ATHE3/I?
The SM6S26ATHE3/I has a typical junction-to-case thermal resistance (RθJC) of 0.95 °C/W, as specified in Vishay's thermal characteristics table. This low value is enabled by the DO-218AC package's integral metal heatsink (anode terminal), which provides a direct thermal path to the PCB. This allows the SM6S26ATHE3/I to sustain high-power surge events without excessive junction temperature rise when properly mounted on adequate copper area.
Why is the SM6S26ATHE3/I marked "Not For New Designs"?
Vishay designates SM6S26ATHE3/I as "Not For New Designs" because the newer SM6S26AHM3 variant supersedes it for future projects. The SM6S26AHM3 offers identical electrical specifications and AEC-Q101 qualification but adds halogen-free materials and updated tape-and-reel orientation. The SM6S26ATHE3/I remains fully supported for existing designs and legacy production, with no change to its performance, reliability, or availability at Aetrix Electronics.
SM6S26ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 109A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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-218AC
SM6S26ATHE3/I FAQ
1.How can I place an order for SM6S26ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S26ATHE3/I 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 SM6S26ATHE3/I reliable?
The price and inventory of SM6S26ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S26ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM6S26ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S26ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S26ATHE3/I?
SM6S26ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S26ATHE3/I 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 SM6S26ATHE3/I?
For technical support, including SM6S26ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S26ATHE3/I requirements.
6.How does Aetrix verify that SM6S26ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM6S26ATHE3/I 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 SM6S26ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM6S26ATHE3/I?
All SM6S26ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S26ATHE3/I, 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 SM6S26ATHE3/I part is unused and in its original packaging.
Return procedure for SM6S26ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S26ATHE3/I Tags
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