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Vishay General Semiconductor - Diodes Division SM5S26AHE3/2D
- Part No.:
- SM5S26AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S26AHE3/2D.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,500
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Product details
Overview
SM5S26AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection in power line circuits. It features a 26.0 V stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR), 42.1 V clamping voltage at 86 A peak pulse current, 3600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S26AHE3/2D datasheet, SM5S26AHE3/2D pinout, SM5S26AHE3/2D application, or SM5S26AHE3/2D equivalent, key selection criteria include its DO-218AB package thermal performance (RθJC = 1.0 °C/W), 175 °C junction rating, uni-directional polarity with anode-heatsink configuration, and compliance with ISO7637-2 surge waveforms.
Technical Context
The SM5S26AHE3/2D employs passivated anisotropic rectifier technology optimized for high-temperature stability and low leakage (<10 μA at VWM, <150 μA at TJ = 175 °C). Its junction design supports 500 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and maintains clamping integrity under repetitive load-dump transients per ISO7637-2.
Thermally, it delivers 5 W steady-state power dissipation on infinite heatsink at TC = 25 °C and derates linearly to zero at TC = 175 °C. The DO-218AB package enables direct metal heatsink mounting-lead 2 serves as both cathode terminal and thermal path-supporting high-power transient absorption without external heatsinking in constrained automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 26.0 V - Maximum continuous reverse operating voltage before conduction begins; defines circuit operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 28.9–31.9 V at 5 mA - Confirmed avalanche onset range; ensures reliable triggering during fast-rising transients |
| VC (Clamping Voltage) | 42.1 V at IPPM = 86 A (10/1000 μs) - Limits downstream component stress during worst-case surge events |
| PPPM (Peak Pulse Power) | 3600 W (10/1000 μs) - Sustains high-energy load dump pulses common in 12 V automotive systems |
| TJ max. | 175 °C - Enables placement near hot engine-control units without derating penalties |
| Polarity | Uni-directional - Anode connected to heatsink; blocks reverse voltage while conducting forward surges |
| RθJC | 1.0 °C/W - Enables efficient heat transfer from junction to case, critical for sustained surge duty cycles |
Pinout & Package
Package: DO-218AB - Surface-mount, anode-heatsink configuration with matte tin-plated leads; meets UL 94 V-0, MSL Level 1 (245 °C reflow), and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Primary surge current return path; connects to protected line (e.g., battery rail); requires low-inductance PCB trace routing |
| Lead 2 / Metal Heatsink | Anode + Thermal Interface | DC ground reference and primary thermal conduction path; must be soldered to large copper pour or chassis for RθJC optimization |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test requirements including temperature cycling, HTRB, and surge endurance |
| Junction passivation | Stable leakage performance (<10 μA @ 25 °C, <150 μA @ 175 °C) ensures long-term reliability in humid, high-voltage environments |
| ISO7637-2 compliance | Withstands defined load dump waveforms (e.g., Pulse 5a) without degradation-verified per test condition limits in spec |
| Low VF (≤2.0 V @ 100 A) | Minimizes forward conduction loss during high-current surge events, reducing localized heating in cathode bond wire |
| DO-218AB mechanical robustness | UL 94 V-0 molding compound and 2.5 g unit weight support vibration-resistant mounting in engine control modules |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Suppresses 12 V system load dump transients (up to 40 V, 100 ms exponential decay) generated when alternator field is interrupted. IC Role / Device Role / Timing Role: Primary clamping device placed between battery rail and DC/DC converter input stage. Use Value: Clamps peak voltage to 42.1 V at 86 A, protecting downstream LDOs and microcontrollers rated for ≤45 V absolute maximum. |
Use Scenario: Shields ECU main power supply against coupled transients from fuel injectors, ignition coils, and solenoids. IC Role / Device Role / Timing Role: Fast-response TVS placed immediately after fuse and before bulk capacitance on 12 V input rail. Use Value: Responds within nanoseconds to sub-100 ns spikes, limiting voltage overshoot to safe levels before downstream regulators enter overvoltage shutdown. |
| Body Control Module (BCM) Power Distribution | ADAS Camera Power Rail Protection |
Use Scenario: Protects centralized BCM power bus supplying door modules, lighting, and HVAC actuators. IC Role / Device Role / Timing Role: High-power TVS integrated into main 12 V distribution node with thermal coupling to metal chassis. Use Value: Handles repetitive 3600 W surges without parameter shift, enabling >100,000 cycle durability in stop-start vehicle operation. |
Use Scenario: Safeguards 5 V or 3.3 V camera module power derived from buck converter fed by 12 V battery. IC Role / Device Role / Timing Role: Secondary clamping stage placed at converter output to suppress switching noise and coupled transients. Use Value: Low clamping voltage (42.1 V) prevents upstream converter latch-up, while 175 °C rating allows placement near heat-generating image sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/57T | DO-214AC package; lower PPPM (400 W); VBR = 28.9–31.9 V; RθJC ≈ 45 °C/W | Limited to low-energy transients; unsuitable for ISO7637-2 Pulse 5a load dump | Select only for cost-sensitive, non-automotive 24 V industrial I/O protection where surge energy ≤400 W |
| SMCJ26AHE3/2D | DO-214AB package; same VBR/VWM/VC specs; higher PPPM (1500 W); RθJC = 2.5 °C/W; AEC-Q101 qualified | Supports moderate automotive surges but lacks 3600 W capability for full load dump compliance | Use where space allows larger footprint and thermal management is less constrained, but full load dump margin is not required |
Compared with SMAJ26A-E3/57T and SMCJ26AHE3/2D, the SM5S26AHE3/2D uniquely combines DO-218AB's low thermal resistance (1.0 °C/W), 3600 W surge rating, and AEC-Q101 qualification-making it the only option among the three validated for direct load dump protection in modern 12 V automotive ECUs without auxiliary heatsinking.
Availability
SM5S26AHE3/2D is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and body control modules requiring stable component supply with guaranteed AEC-Q101 compliance and long-term production continuity.
Supply support for SM5S26AHE3/2D 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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and optoelectronics, with emphasis on high-reliability, high-temperature, and automotive-grade components.
The SM5SxxA series was developed specifically for automotive load dump and ISO7637-2 transient suppression, leveraging passivated junction technology to deliver stable performance up to 175 °C in compact surface-mount packages.
FAQ
What is the clamping voltage of the SM5S26AHE3/2D at its rated peak pulse current?
The SM5S26AHE3/2D has a maximum clamping voltage (VC) of 42.1 V when subjected to its peak pulse current (IPPM) of 86 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C and ensures downstream components see limited overvoltage during surge events. The SM5S26AHE3/2D maintains this clamping performance across its full operating temperature range due to its thermally optimized DO-218AB package.
Is the SM5S26AHE3/2D suitable for bidirectional transient protection?
No, the SM5S26AHE3/2D is a unidirectional TVS diode and is not suitable for bidirectional protection. Its electrical characteristics-including breakdown voltage, clamping behavior, and polarity-are specified only for reverse-biased operation (anode grounded, cathode to protected line). For bidirectional applications, a dedicated bi-directional part such as the SMBJ26AHE3/2D would be required. The SM5S26AHE3/2D data sheet explicitly states "Available in uni-directional polarity only."
Does the SM5S26AHE3/2D meet automotive qualification standards?
Yes, the SM5S26AHE3/2D is AEC-Q101 qualified and rated for operation from –55 °C to +175 °C. It also meets ISO7637-2 surge test requirements for automotive load dump (Pulse 5) under specified test conditions, and complies with J-STD-020 MSL Level 1 reflow profile (peak 245 °C). These qualifications are documented in Vishay's official specification document 88382, revision 22-Jul-16.
How is thermal management implemented in the SM5S26AHE3/2D package?
The SM5S26AHE3/2D uses the DO-218AB package where lead 2 functions as both the anode terminal and the primary thermal interface. With a typical junction-to-case thermal resistance (RθJC) of 1.0 °C/W, effective heat dissipation requires soldering this metal heatsink directly to a large copper area or chassis ground plane. Unlike smaller packages, DO-218AB eliminates reliance on PCB traces alone, enabling the SM5S26AHE3/2D to sustain repeated 3600 W surges without thermal runaway.
What is the maximum reverse leakage current of the SM5S26AHE3/2D at elevated temperature?
At its maximum operating junction temperature of 175 °C and rated stand-off voltage (VWM = 26.0 V), the SM5S26AHE3/2D exhibits a maximum reverse leakage current (ID) of 150 μA. At room temperature (25 °C), leakage is ≤10 μA under the same VWM condition. This low, temperature-stable leakage is enabled by Vishay's junction passivation process and supports long-term reliability in high-humidity automotive environments.
SM5S26AHE3/2D 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S26AHE3/2D FAQ
1.How can I place an order for SM5S26AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S26AHE3/2D 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 SM5S26AHE3/2D reliable?
The price and inventory of SM5S26AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S26AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S26AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S26AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S26AHE3/2D?
SM5S26AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S26AHE3/2D 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 SM5S26AHE3/2D?
For technical support, including SM5S26AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S26AHE3/2D requirements.
6.How does Aetrix verify that SM5S26AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S26AHE3/2D 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 SM5S26AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S26AHE3/2D?
All SM5S26AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S26AHE3/2D, 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 SM5S26AHE3/2D part is unused and in its original packaging.
Return procedure for SM5S26AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S26AHE3/2D Tags
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