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Vishay General Semiconductor - Diodes Division SM6S26AHM3/I
- Part No.:
- SM6S26AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM6S26AHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,050
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Product details
Overview
SM6S26AHM3/I 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), 4600 W peak pulse power (10/1000 μs), and AEC-Q101 qualified for automotive load dump protection in engine control units and body electronics.
For engineers reviewing the SM6S26AHM3/I datasheet, SM6S26AHM3/I pinout, SM6S26AHM3/I application, or SM6S26AHM3/I equivalent, this page delivers verified electrical specs, thermal performance at TJ = 175 °C, unidirectional clamping behavior, and direct alternative part guidance for high-reliability 12 V/24 V automotive systems.
Technical Context
The SM6S26AHM3/I employs passivated anisotropic rectifier technology to deliver low leakage (<10 μA at VWM) and low forward voltage drop (VF ≤ 1.9 V @ 100 A), enabling robust transient suppression without compromising system efficiency during normal operation.
It is thermally optimized for junction temperatures up to +175 °C with RθJM = 0.45 °C/W and meets ISO 7637-2 surge requirements under defined test conditions, supporting automotive-grade reliability in harsh under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range in 24 V automotive systems. |
| 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 109 A peak pulse current (10/1000 μs); limits downstream IC stress during load dump events. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling; supports high-energy surges per ISO 7637-2 Pulse 5a without failure. |
| TJ max | +175 °C - Maximum junction temperature rating; enables operation in high-ambient under-hood locations without derating. |
| Polarity | Unidirectional - Anode-connected heatsink configuration; requires correct PCB layout orientation for proper circuit protection. |
| Package | DO-218AB - Surface-mount case with metal heatsink terminal; provides low thermal resistance (RθJM = 0.45 °C/W) and MSL Level 1 moisture sensitivity. |
Pinout & Package
DO-218AB package features two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). The heatsink serves as the anode connection and must be electrically tied to the system ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery rail); carries transient current into device during clamping. |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to large copper area or chassis ground; functions as primary thermal path and return path for surge current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Junction passivation | Reduces surface leakage and improves long-term stability under high-humidity and high-temperature bias conditions. |
| MSL Level 1 rating | Enables standard SMT reflow without pre-baking; compatible with JEDEC J-STD-020 peak of 245 °C. |
| Low VF (≤1.9 V @ 100 A) | Minimizes conduction loss during forward-biased surge events, reducing localized heating and improving energy absorption margin. |
| ISO 7637-2 compliance | Meets Pulse 5a (load dump) requirements when tested per specified waveform and coupling network conditions. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Protection |
|---|---|
Use Scenario: Protects microcontroller power supply against 12 V system load dump transients up to 35 V and 4600 W. IC Role / Device Role / Timing Role: Unidirectional TVS clamps overvoltage spikes within nanoseconds to prevent latch-up or permanent damage to LDOs and MCU cores. Use Value: Enables compliance with ISO 7637-2 Pulse 5a using single-device solution with 42.1 V clamping voltage at 109 A. |
Use Scenario: Shields CAN transceivers and sensor interfaces on 12 V battery-fed BCM boards from ignition-induced switching transients. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed at main power entry point to limit voltage excursions below 42.1 V during 10/1000 μs surges. Use Value: Maintains signal integrity by preventing bus reset or communication dropout during repeated load-switching events. |
| Start-Stop System Voltage Regulator Protection | Electric Power Steering (EPS) Motor Driver Supply Protection |
Use Scenario: Guards buck converter input stage in start-stop systems exposed to repeated 24 V battery transients during engine restart cycles. IC Role / Device Role / Timing Role: High-surge-capability TVS absorbs repetitive 3600 W (10/10,000 μs) pulses without degradation across >100,000 cycles. Use Value: Extends regulator lifetime by limiting peak input voltage to 42.1 V while sustaining 175 °C junction operation. |
Use Scenario: Safeguards H-bridge gate drivers and current sense amplifiers in EPS modules subjected to motor back-EMF and load dump. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground via metal heatsink, providing low-inductance path for surge return current. Use Value: Prevents false triggering and overvoltage lockout in motor control ICs by clamping transients before they exceed 42.1 V threshold. |
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 electrical specs and DO-218AB package; differs only in packaging - no /I suffix means no tape-and-reel orientation marking (anode direction not indicated on reel). | No functional difference in circuit protection; /I variant guarantees anode-toward-sprocket-hole orientation for automated placement verification. | Select SM6S26AHM3/I when precise anode orientation tracking is required for SMT traceability or process validation. |
| SM6S28AHM3/I | Higher VWM (28 V) and VBR (32.8 V nominal); clamping voltage 45.4 V at 101 A; same 4600 W PPPM rating. | Better suited for 24 V nominal systems with wider voltage tolerance; less margin for 12 V systems near upper VWM limit. | Choose SM6S26AHM3/I for 12 V/24 V dual-voltage platforms where 26 V VWM provides tighter clamping headroom versus SM6S28AHM3/I. |
Compared with SM6S26AHM3 and SM6S28AHM3/I, the SM6S26AHM3/I offers optimal balance of clamping voltage (42.1 V), stand-off margin (26 V), and AEC-Q101 reliability for 12 V automotive subsystems requiring deterministic anode orientation in automated assembly.
Availability
SM6S26AHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, body electronics development, and start-stop system integration requiring stable component supply and full AEC-Q101 traceability.
Supply support for SM6S26AHM3/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, MOSFETs, and protection devices engineered for high reliability and automotive-grade performance.
The SM6S series is designed specifically for automotive load dump and inductive switching transient suppression, emphasizing high-temperature operation, low leakage, and robust surge handling in DO-218AB packaging.
FAQ
What is the maximum clamping voltage of the SM6S26AHM3/I?
The SM6S26AHM3/I has a maximum clamping voltage (VC) of 42.1 V at 109 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6S26AHM3/I maintains this clamping performance across its full operating temperature range up to TJ = 175 °C.
Is the SM6S26AHM3/I AEC-Q101 qualified?
Yes, the SM6S26AHM3/I is explicitly AEC-Q101 qualified, as confirmed in Vishay's official documentation (Document Number 88384). This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock, ensuring suitability for automotive under-hood applications. The "H" in the part number denotes AEC-Q101 qualification status.
What does the "/I" suffix mean in SM6S26AHM3/I?
The "/I" suffix in SM6S26AHM3/I indicates tape-and-reel packaging with anode orientation guaranteed toward the sprocket hole - critical for automated pick-and-place verification. This differs from SM6S26AHM3 (without /I), which uses the same DO-218AB package and electrical specs but lacks orientation marking on the reel. Both share identical thermal and electrical performance.
Can the SM6S26AHM3/I be used in 24 V automotive systems?
Yes, the SM6S26AHM3/I is suitable for 24 V nominal systems, as its 26 V stand-off voltage (VWM) provides adequate margin above typical 24 V rail variations (e.g., 28–30 V during charging), while its 42.1 V clamping voltage remains within safe limits for most 24 V-rated components. It is commonly deployed in start-stop and EPS modules operating on 24 V architectures.
What is the thermal resistance from junction to mount (RθJM) for the SM6S26AHM3/I?
The SM6S26AHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.45 °C/W, measured per JEDEC 51-14 using the Transient Dual Interface Method. This low value reflects the efficient heat transfer path through the metal heatsink terminal (anode) into the PCB copper or chassis, enabling sustained operation at TJ = 175 °C in high-power transient scenarios.
SM6S26AHM3/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):
- 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
SM6S26AHM3/I FAQ
1.How can I place an order for SM6S26AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S26AHM3/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 SM6S26AHM3/I reliable?
The price and inventory of SM6S26AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S26AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6S26AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S26AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S26AHM3/I?
SM6S26AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S26AHM3/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 SM6S26AHM3/I?
For technical support, including SM6S26AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S26AHM3/I requirements.
6.How does Aetrix verify that SM6S26AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6S26AHM3/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 SM6S26AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6S26AHM3/I?
All SM6S26AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S26AHM3/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 SM6S26AHM3/I part is unused and in its original packaging.
Return procedure for SM6S26AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S26AHM3/I Tags
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