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Vishay General Semiconductor - Diodes Division SM5S26A-E3/2D
- Part No.:
- SM5S26A-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S26A-E3/2D.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,582
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Product details
Overview
SM5S26A-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection in 24 V systems. It features a 26.0 V stand-off voltage (VWM), 42.1 V maximum clamping voltage (VC) at 86 A peak pulse current, and 3600 W peak pulse power (10/1000 µs), operating up to TJ = 175 °C.
For engineers reviewing the SM5S26A-E3/2D datasheet, SM5S26A-E3/2D pinout, SM5S26A-E3/2D application, or SM5S26A-E3/2D equivalent, key selection criteria include its AEC-Q101 qualification, DO-218AB package thermal performance (RθJC = 1.0 °C/W), low leakage (<10 µA at VWM), and compliance with ISO7637-2 surge testing for automotive electronics.
Technical Context
The SM5S26A-E3/2D employs passivated anisotropic rectifier technology optimized for high-temperature stability and low forward voltage drop. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to PCB copper planes for efficient thermal dissipation in high-surge environments.
It delivers 3600 W peak pulse power under 10/1000 µs waveform and sustains 2800 W under longer 10/10 000 µs transients-critical for load dump events. The device maintains <10 µA reverse leakage at 26.0 V and 25 °C, rising to ≤150 µA at TJ = 175 °C, supporting reliable operation across automotive temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VC @ IPPM | 42.1 V - Clamped voltage at 86 A peak pulse current, limiting downstream voltage stress |
| PPPM (10/1000 µs) | 3600 W - Surge energy handling capability for short-duration automotive transients |
| TJ max. | 175 °C - Enables under-hood deployment without derating in high-ambient environments |
| RθJC | 1.0 °C/W - Low junction-to-case thermal resistance supports direct heatsink coupling |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components |
| MSL Level | Level 1 (245 °C peak) - Compatible with standard lead-free reflow soldering processes |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with metal heatsink terminal (anode), matte tin-plated leads, UL 94 V-0 rated compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connected to protected circuit ground reference; primary current entry point during clamping |
| Lead 2 / Metal Heatsink | Anode (Heatsink) | Electrically tied to anode; provides low-thermal-resistance path to PCB copper pour or external heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable leakage and breakdown behavior over 175 °C lifetime |
| High surge capability | Withstands 500 A non-repetitive forward surge (8.3 ms half-sine), supporting robust inrush and fault tolerance |
| Low VF | ≤2.0 V forward voltage at 100 A enables minimal conduction loss during clamping |
| ISO7637-2 compliance | Validated against automotive load dump waveforms, including exponential 10 ms pulses per Fig. 2 |
| RoHS & WEEE compliance | Fully compliant with Directive 2011/65/EU and 2002/96/EC, enabling global automotive supply chain use |
Applications
| Automotive Load Dump Protection | Industrial 24 V DC Power Rails |
|---|---|
Use Scenario: Protecting ECUs, body control modules, and infotainment systems from 12 V/24 V vehicle battery system transients during alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground, clamping surges within 1 ns response time. Use Value: Limits rail voltage to ≤42.1 V during 3600 W transients, preventing damage to downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers (PLCs), motor drives, and sensors on factory-floor 24 V DC distribution networks exposed to inductive switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input power stage, absorbing repetitive 10/1000 µs surges up to 86 A. Use Value: Maintains <10 µA leakage at 26 V, minimizing standby power loss while delivering 175 °C junction operation for sealed enclosure reliability. |
| Commercial Vehicle Telematics | Off-Highway Equipment Power Management |
Use Scenario: Securing GPS/GNSS receivers, cellular modems, and CAN transceivers in fleet management units subjected to harsh vibration and wide ambient temperature swings. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 24 V input, leveraging DO-218AB mechanical robustness and MSL Level 1 reflow compatibility. Use Value: AEC-Q101 qualification ensures validated reliability for >15-year field life; RθJC = 1.0 °C/W enables passive cooling without forced airflow. | Use Scenario: Protecting hydraulic control valves, engine monitoring sensors, and display interfaces in construction and agricultural machinery with 24 V starter-battery architectures. IC Role / Device Role / Timing Role: High-energy transient suppressor mounted directly to thick copper ground plane via metal heatsink terminal. Use Value: Sustains 2800 W under 10/10 000 µs waveform-matching long-tail load dump profiles common in diesel engine systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/5A | DO-214AC package; lower PPPM (400 W); higher VC (42.8 V at 58.3 A); RθJC ≈ 50 °C/W | Limited to lower-energy transients; unsuitable for ISO7637-2 load dump without parallel staging | Select when board space is constrained and surge energy is ≤400 W |
| TPSMD26A | DO-218AB package; same VWM/VC specs; 3000 W PPPM (10/1000 µs); not AEC-Q101 qualified | Acceptable for industrial 24 V rails but not certified for automotive safety-critical systems | Select for cost-sensitive industrial designs where AEC-Q101 is not mandated |
Compared with SMAJ26A-E3/5A and TPSMD26A, the SM5S26A-E3/2D uniquely combines AEC-Q101 qualification, 3600 W surge rating, and DO-218AB's 1.0 °C/W thermal resistance-enabling single-device load dump protection in space-constrained automotive modules without derating or thermal compromise.
Availability
SM5S26A-E3/2D is available at Aetrix Electronics and suitable for automotive ECU protection, industrial 24 V power rail hardening, and off-highway equipment transient suppression requiring stable component supply and full traceability.
Supply support for SM5S26A-E3/2D 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 optoelectronics with emphasis on high-reliability, high-temperature, and automotive-grade solutions.
The SM5SxxA series was engineered specifically for AEC-Q101-compliant automotive transient suppression, targeting load dump, inductive switching, and lighting surge protection in 12 V and 24 V vehicle electrical systems.
FAQ
What is the clamping voltage of the SM5S26A-E3/2D at its rated peak pulse current?
The SM5S26A-E3/2D has a maximum clamping voltage (VC) of 42.1 V at its specified peak pulse current (IPPM) of 86 A under a 10/1000 µs waveform. This value is measured per the conditions defined in the Vishay datasheet Document Number 88382 and ensures downstream components see no more than 42.1 V during worst-case surge events. The SM5S26A-E3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S26A-E3/2D suitable for 24 V automotive load dump protection per ISO7637-2?
Yes, the SM5S26A-E3/2D is explicitly validated to meet ISO7637-2 surge requirements for automotive load dump protection, as confirmed in the Vishay datasheet. Its 3600 W peak pulse power rating (10/1000 µs) and 2800 W rating (10/10 000 µs), combined with AEC-Q101 qualification, make it appropriate for protecting 24 V systems. The SM5S26A-E3/2D is routinely deployed in body control modules and telematics units requiring ISO7637-2 compliance.
What is the thermal resistance from junction to case (RθJC) for the SM5S26A-E3/2D?
The SM5S26A-E3/2D has a typical junction-to-case thermal resistance (RθJC) of 1.0 °C/W, as specified in the Vishay datasheet. This low value is enabled by its DO-218AB package with integrated metal heatsink terminal, allowing efficient heat transfer to PCB copper pours or external heatsinks. This thermal performance is critical for maintaining the SM5S26A-E3/2D's 175 °C maximum junction temperature during sustained surge events.
Does the SM5S26A-E3/2D have unidirectional or bidirectional polarity?
The SM5S26A-E3/2D is a unidirectional transient voltage suppressor, as stated in the Vishay datasheet. Its polarity is fixed: the metal heatsink and Lead 1 are both anode terminals, and the device conducts only during positive transients relative to ground. This configuration is optimized for DC power rail protection in 24 V automotive systems. Bidirectional variants are not offered in the SM5S26A-E3/2D family.
What packaging and reel configuration is used for the SM5S26A-E3/2D?
The SM5S26A-E3/2D is supplied in 13-inch diameter plastic tape and reel format, with anode orientation toward the sprocket hole, per the Vishay ordering information. The base quantity is 750 units per reel, and the package code is "2D". This configuration ensures automated placement compatibility and conforms to J-STD-002 and JESD22-B102 solderability standards. The SM5S26A-E3/2D's tape-and-reel packaging supports high-volume manufacturing of automotive and industrial assemblies.
SM5S26A-E3/2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- 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):
- 86A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S26A-E3/2D FAQ
1.How can I place an order for SM5S26A-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S26A-E3/2D 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 SM5S26A-E3/2D reliable?
The price and inventory of SM5S26A-E3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S26A-E3/2D is usually 5 days.
3.What payment methods are accepted for SM5S26A-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S26A-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S26A-E3/2D?
SM5S26A-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S26A-E3/2D 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 SM5S26A-E3/2D?
For technical support, including SM5S26A-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S26A-E3/2D requirements.
6.How does Aetrix verify that SM5S26A-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S26A-E3/2D 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 SM5S26A-E3/2D meets industry standards.
7.What is the process for return or replacement of SM5S26A-E3/2D?
All SM5S26A-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S26A-E3/2D, 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 SM5S26A-E3/2D part is unused and in its original packaging.
Return procedure for SM5S26A-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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