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Vishay General Semiconductor - Diodes Division SM8S26AHM3/I
- Part No.:
- SM8S26AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S26AHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
SM8S26AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 26 V stand-off voltage (VWM), 30.4 V nominal breakdown (VBR), 42.1 V clamping voltage at 157 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). It delivers automotive-grade protection against load dump transients in 12 V battery systems.
For engineers reviewing the SM8S26AHM3/I datasheet, SM8S26AHM3/I pinout, SM8S26AHM3/I application, or SM8S26AHM3/I equivalent, this device is selected for high-reliability automotive electronics requiring AEC-Q101 qualification, TJ = 175 °C operation, low leakage (<10 μA at VWM), and ISO7637-2 compliance under defined test conditions.
Technical Context
The SM8S26AHM3/I employs passivated anisotropic rectifier technology to achieve stable clamping performance across temperature. Its unidirectional polarity configures the metal heatsink as anode, enabling direct thermal coupling to PCB copper for enhanced surge dissipation.
It supports 10/1000 μs and 10/10,000 μs surge waveforms with respective peak pulse powers of 6600 W and 5200 W, and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak. Thermal resistance junction-to-mount is 0.35 °C/W, confirming suitability for high-power transient suppression without external heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines system operating margin in 12 V automotive circuits. |
| VBR (nom) | 30.4 V - Breakdown voltage at 5 mA test current; ensures reliable turn-on during transients exceeding normal supply rails. |
| VC @ IPPM | 42.1 V - Clamping voltage at 157 A peak pulse current; limits downstream voltage stress during load dump events. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capability; enables robust protection against high-energy ISO7637-2 Pulse 5a/b surges. |
| TJ max | 175 °C - Maximum junction temperature rating; supports under-hood deployment in modern automotive ECUs and ADAS modules. |
| Leakage @ VWM | <10 μA - Low reverse leakage at stand-off voltage; minimizes quiescent power loss in always-on vehicle subsystems. |
| Package | DO-218AB - Thermally optimized surface-mount case with metal heatsink terminal; provides low RθJM (0.35 °C/W) for efficient surge energy dissipation. |
Pinout & Package
DO-218AB package features two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). The metal heatsink serves as both electrical anode connection and primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into device during clamping. |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to ground plane; enables low-inductance, high-current return path and direct thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTGB, HTRB, and temperature cycling - ensures long-term reliability in harsh environments. |
| Junction passivation design | Stable VBR drift <±5 % over lifetime; prevents parameter shift due to moisture ingress or bias stress in sealed modules. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 245 °C peak; eliminates pre-bake requirement and simplifies manufacturing. |
| ISO7637-2 compliant | Validated for Pulse 5a (load dump) under specified test setup; reduces need for additional system-level validation effort. |
| Low forward voltage drop | VF ≤ 1.8 V at 100 A (300 μs pulse); minimizes conduction loss during high-current clamping events. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: 12 V battery line feeding microcontroller power supply in engine bay environment subject to alternator load dump. IC Role / Device Role: Primary transient clamp on main input rail upstream of DC/DC converter. Use Value: Limits voltage excursion to ≤42.1 V during 6600 W surges, preventing damage to 40 V-rated input capacitors and LDOs. | Use Scenario: CAN transceiver power rail exposed to coupled transients from nearby high-current loads (e.g., window motors, HVAC). IC Role / Device Role: Secondary surge suppressor on VCC line of isolated CAN interface IC. Use Value: Maintains <10 μA leakage at 26 V, avoiding false wake-up or excessive sleep current in always-on BCM nodes. |
| Advanced Driver Assistance System (ADAS) Camera Module | Electric Power Steering (EPS) Motor Driver Board |
Use Scenario: Front-facing camera module powered directly from vehicle battery with minimal filtering. IC Role / Device Role: First-line protection before EMI filter and LDO regulator. Use Value: Withstands repeated 10/1000 μs surges up to 157 A while maintaining TJ ≤175 °C, ensuring uninterrupted imaging during road vibration-induced switching noise. | Use Scenario: High-current motor driver board where MOSFET gate drivers and current sense amplifiers share supply with MCU. IC Role / Device Role: Bulk transient suppressor on 12 V auxiliary rail feeding analog front-end and logic. Use Value: DO-218AB metal heatsink provides direct thermal path to inner ground plane, limiting thermal impedance to 0.35 °C/W and sustaining surge duty cycles without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26AHE3/A | Lower PPPM (400 W vs. 6600 W), DO-214AC package, 26 V VWM, same AEC-Q101 grade. | Not suitable for load dump; limited to ESD and low-energy switching transients. | Select SMAJ26AHE3/A only when surge energy is below 100 mJ and PCB space constraints prohibit DO-218AB. |
| SM8S26AHE3/A | Same electrical specs and DO-218AB package, but industry-grade (non-AEC-Q101) version; identical thermal and clamping performance. | Acceptable for non-automotive industrial control or commercial power supplies where qualification is not mandated. | Choose SM8S26AHE3/A for cost-sensitive non-automotive designs where AEC-Q101 is not required. |
Compared with SMAJ26AHE3/A and SM8S26AHE3/A, the SM8S26AHM3/I uniquely combines 6600 W surge capability, AEC-Q101 qualification, and DO-218AB thermal performance - making it the only option among the three validated for under-hood automotive load dump protection.
Availability
SM8S26AHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, advanced driver assistance systems, and electric power steering systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM8S26AHM3/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 diodes, rectifiers, TVS devices, and power MOSFETs for industrial, automotive, and computing applications.
The SM8SxxA family was engineered specifically for high-energy automotive load dump protection, emphasizing thermal robustness, AEC-Q101 compliance, and ISO7637-2 Pulse 5a/b validation in surface-mount form factor.
FAQ
What is the maximum clamping voltage of the SM8S26AHM3/I at its rated peak pulse current?
The SM8S26AHM3/I has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 157 A under 10/1000 μs waveform conditions. This value is measured per standard test methods and ensures predictable voltage limiting during automotive load dump events. The SM8S26AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SM8S26AHM3/I qualified for automotive applications?
Yes, the SM8S26AHM3/I is AEC-Q101 qualified and explicitly designed for automotive use. It meets requirements for high-temperature operation up to TJ = 175 °C, passes humidity and bias stress tests, and is validated for ISO7637-2 Pulse 5a/b load dump immunity. The "H" in the part number denotes AEC-Q101 qualification, confirming its suitability for under-hood ECUs and ADAS modules.
What does the "M3/I" suffix indicate in SM8S26AHM3/I?
The "M3" suffix indicates tape-and-reel packaging per EIA-481 standard with 750 units per reel; "I" denotes the preferred package code per Vishay's ordering nomenclature, specifying anode orientation toward sprocket holes. The full designation SM8S26AHM3/I confirms AEC-Q101 grade ("H"), DO-218AB package ("M3"), and RoHS-compliant, lead-free termination ("I").
Can the SM8S26AHM3/I replace older SM8S26A variants in existing designs?
Yes, the SM8S26AHM3/I is a direct replacement for legacy SM8S26AHE3/A and SM8S26AHE3/AT versions in terms of electrical specs, package outline, and thermal performance. Its AEC-Q101 qualification adds assurance for new automotive designs, and the DO-218AB footprint remains identical - no PCB layout changes are required when upgrading to SM8S26AHM3/I.
Does the SM8S26AHM3/I meet MSL Level 1 for surface-mount assembly?
Yes, the SM8S26AHM3/I meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 245 °C. This allows placement using standard lead-free SMT processes without dry-pack or baking requirements. The device's matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, ensuring reliable joint formation in high-volume manufacturing.
SM8S26AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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-218AC
SM8S26AHM3/I FAQ
1.How can I place an order for SM8S26AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S26AHM3/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 SM8S26AHM3/I reliable?
The price and inventory of SM8S26AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S26AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S26AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S26AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S26AHM3/I?
SM8S26AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S26AHM3/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 SM8S26AHM3/I?
For technical support, including SM8S26AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S26AHM3/I requirements.
6.How does Aetrix verify that SM8S26AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S26AHM3/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 SM8S26AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S26AHM3/I?
All SM8S26AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S26AHM3/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 SM8S26AHM3/I part is unused and in its original packaging.
Return procedure for SM8S26AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S26AHM3/I Tags
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