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Vishay General Semiconductor - Diodes Division SM5S26AHM3/I
- Part No.:
- SM5S26AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM5S26AHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
SM5S26AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, designed for automotive load dump protection with 26 V standoff voltage, 30.4 V nominal breakdown voltage, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for operation up to 175 °C junction temperature.
For engineers reviewing the SM5S26AHM3/I datasheet, SM5S26AHM3/I pinout, SM5S26AHM3/I application, or SM5S26AHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail surge suppression where low clamping voltage (42.1 V), low leakage (<10 μA at VWM), and robust 500 A IFSM capability are critical design requirements.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability under thermal stress. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to metal chassis for enhanced thermal dissipation in automotive modules.
It meets ISO 7637-2 surge test conditions for load dump transients and complies with MSL Level 1 (245 °C peak reflow), supporting automated SMT assembly without moisture sensitivity concerns. The RθJM of 0.45 °C/W confirms efficient heat transfer from junction to heatsink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V automotive systems. |
| VBR (nom) | 30.4 V - Breakdown voltage at 5 mA test current; ensures reliable triggering during transient overvoltage events above system nominal. |
| VC @ IPPM | 42.1 V - Clamping voltage at 150 A peak pulse current; limits downstream component stress during 10/1000 μs surges. |
| PPPM (10/1000 μs) | 3600 W - Peak pulse power handling capacity; supports high-energy load dump transients per ISO 7637-2. |
| TJ max | 175 °C - Maximum junction temperature rating; enables use in engine bay and powertrain control units without derating. |
| IFSM | 500 A - Non-repetitive forward surge current rating; withstands high-current inductive switching events without failure. |
| Polarity | Unidirectional - Anode-connected heatsink configuration; requires correct PCB layout orientation for proper circuit protection. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with matte tin-plated leads, UL 94 V-0 rated compound, and heatsink-integrated anode terminal (Lead 2). Mounting pad layout follows IPC-7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery feed); conducts transient current to heatsink/anode during clamping. |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to PCB ground plane or metal chassis; serves as primary heat path and return path. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR drift <±0.088 %/°C and long-term reliability under thermal cycling. |
| AEC-Q101 qualification | Validated for automotive-grade production use including HTOL, TC, HAST, and UHAST testing per stress test conditions. |
| Low leakage at high temperature | <10 μA at 26 V and TJ = 175 °C - minimizes standby power loss and avoids false triggering in hot under-hood environments. |
| High surge capability | Withstands 150 A (10/1000 μs) and 500 A (8.3 ms half-sine) pulses - exceeds ISO 7637-2 Pulse 5a/b requirements for 24 V systems. |
| MSL Level 1 compliance | Rated for 245 °C peak reflow profile without baking; eliminates moisture-related popcorning during standard SMT assembly. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protection of 12 V supply rail against alternator load dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and DC/DC converter input. Use Value: Limits transient voltage to ≤42.1 V, preventing damage to downstream 40 V-rated MOSFETs and LDO regulators. |
Use Scenario: Surge suppression on main 24 V power input of diesel engine ECU exposed to cranking and load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp mounted directly to metal housing for thermal coupling. Use Value: Absorbs 3600 W peak energy without degradation, maintaining system uptime in harsh thermal environments up to 175 °C. |
| Commercial Vehicle Telematics Unit | ADAS Camera Power Interface |
Use Scenario: Protecting CAN-FD and Ethernet PHY power rails from coupled transients induced by heavy-duty relay switching. IC Role / Device Role / Timing Role: Secondary TVS stage after fuse and upstream filter, placed adjacent to connector entry point. Use Value: Low 0.45 °C/W RθJM enables effective heat spreading into aluminum enclosure, avoiding thermal runaway during repeated surges. |
Use Scenario: Safeguarding 5 V/3.3 V imaging sensor power supplies from ESD and cable discharge events in rear-view camera modules. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output rail, leveraging low leakage (<10 μA) to avoid signal integrity impact. Use Value: Clamps sub-50 V transients within nanoseconds while adding negligible quiescent current to battery-sensitive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM5S26AHM3 | Same electrical specs and DO-218AB package; differs only in packaging - no /I suffix means bulk or different reel configuration (non-tape-and-reel). | No functional difference; suitable for prototype builds or non-automated assembly where tape-and-reel is not required. | Select SM5S26AHM3/I for automated SMT lines requiring 13" tape-and-reel delivery with anode orientation toward sprocket hole. |
| SM5S28AHM3/I | Higher VWM (28 V) and VBR (32.8 V nominal); identical package, power rating, and qualification level. | Better suited for 24 V systems with wider voltage tolerance; less margin for 12 V systems near upper VWM limit. | Choose SM5S26AHM3/I when protecting 24 V nominal rails with tight clamping headroom; SM5S28AHM3/I offers higher standoff for systems with elevated quiescent voltage. |
Compared with SM5S26AHM3 and SM5S28AHM3/I, the SM5S26AHM3/I provides optimal balance of 26 V system compatibility, 42.1 V clamping, and AEC-Q101 reliability-making it the preferred choice for cost-sensitive yet thermally demanding automotive power rail protection where precise voltage coordination is required.
Availability
SM5S26AHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and commercial vehicle telematics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM5S26AHM3/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, and passive components for automotive, industrial, and computing markets.
The SM5S series is part of Vishay's PAR® TVS platform, engineered specifically for automotive-grade transient suppression in high-temperature, high-surge environments such as powertrain and chassis control modules.
FAQ
What is the clamping voltage of the SM5S26AHM3/I at its rated peak pulse current?
The SM5S26AHM3/I has a maximum clamping voltage (VC) of 42.1 V at 150 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 SM5S26AHM3/I maintains this clamping performance across its full operating temperature range, ensuring consistent protection behavior in automotive under-hood applications.
Is the SM5S26AHM3/I qualified for automotive applications?
Yes, the SM5S26AHM3/I is AEC-Q101 qualified and rated for operation from -55 °C to +175 °C junction temperature. It meets ISO 7637-2 load dump surge requirements and is manufactured with RoHS-compliant, halogen-free materials. The "H" in the part number explicitly denotes AEC-Q101 qualification, making the SM5S26AHM3/I suitable for safety-critical automotive power rail protection in BCM, ECU, and ADAS subsystems.
What does the "/I" suffix mean in SM5S26AHM3/I?
The "/I" suffix in SM5S26AHM3/I indicates the preferred packaging configuration: 13-inch diameter plastic tape-and-reel with 750 units per reel and anode orientation toward the sprocket hole. This format is optimized for high-volume SMT placement equipment. The base part SM5S26AHM3 remains electrically and mechanically identical-the /I designation solely specifies packaging and delivery method for the SM5S26AHM3/I variant.
How does the DO-218AB package of the SM5S26AHM3/I improve thermal performance?
The DO-218AB package of the SM5S26AHM3/I integrates a metal heatsink as Lead 2 (anode), enabling direct thermal coupling to PCB copper pours or metal enclosures. With a junction-to-mount thermal resistance (RθJM) of 0.45 °C/W, the SM5S26AHM3/I efficiently transfers heat away from the silicon die-critical for sustaining 3600 W surge capability without thermal runaway. This architecture eliminates reliance on trace-based conduction alone, unlike smaller SOD or SMA packages.
Can the SM5S26AHM3/I be used in 12 V and 24 V automotive systems?
Yes, the SM5S26AHM3/I is designed for both 12 V and 24 V automotive systems. Its 26 V standoff voltage (VWM) provides adequate margin above 12 V nominal rails and sufficient headroom below typical 24 V load dump peaks. The 30.4 V nominal breakdown and 42.1 V clamping ensure fast, controlled conduction during transients while avoiding nuisance triggering during normal battery voltage fluctuations. System-level validation per ISO 7637-2 remains essential, but the SM5S26AHM3/I is dimensioned for dual-voltage compatibility.
SM5S26AHM3/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):
- 86A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S26AHM3/I FAQ
1.How can I place an order for SM5S26AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S26AHM3/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 SM5S26AHM3/I reliable?
The price and inventory of SM5S26AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S26AHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S26AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S26AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S26AHM3/I?
SM5S26AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S26AHM3/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 SM5S26AHM3/I?
For technical support, including SM5S26AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S26AHM3/I requirements.
6.How does Aetrix verify that SM5S26AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S26AHM3/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 SM5S26AHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S26AHM3/I?
All SM5S26AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S26AHM3/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 SM5S26AHM3/I part is unused and in its original packaging.
Return procedure for SM5S26AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S26AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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