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Vishay General Semiconductor - Diodes Division SM8S26ATHE3/I
- Part No.:
- SM8S26ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S26ATHE3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,014
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Product details
Overview
SM8S26ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a breakdown voltage of 28.9–31.9 V, 6600 W peak pulse power (10/1000 μs), 157 A peak pulse current, 42.1 V clamping voltage at IPPM, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S26ATHE3/I datasheet, SM8S26ATHE3/I pinout, SM8S26ATHE3/I application, or SM8S26ATHE3/I equivalent, key selection criteria include its DO-218AC package thermal resistance (RθJC = 0.90 °C/W), TJ = 175 °C operation, ISO7637-2 compliance, low leakage (<10 μA at VWM), and unidirectional polarity with heatsink-as-anode configuration.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver high-reliability transient suppression in harsh automotive environments. Its junction temperature rating up to 175 °C and MSL Level 1 moisture sensitivity support reflow soldering at 245 °C peak, while the DO-218AC case provides robust thermal conduction via metal heatsink termination.
The device operates exclusively in unidirectional mode with anode connected to the heatsink-critical for correct PCB layout in 12 V/24 V load dump circuits. Clamping performance is specified at 42.1 V (max) under 157 A 10/1000 μs surge, enabling reliable protection of downstream DC-DC converters and microcontrollers without overvoltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 28.9 / 30.4 / 31.9 V - defines precise breakdown threshold for predictable turn-on during transients |
| VC @ IPPM | 42.1 V - maximum clamped voltage seen by protected circuit during 157 A surge |
| PPPM (10/1000 μs) | 6600 W - enables single-event suppression of severe load dump spikes per ISO7637-2 |
| RθJC | 0.90 °C/W - allows direct thermal coupling to PCB copper pour or heatsink for sustained power handling |
| TJ max | 175 °C - supports under-hood placement near engines or power electronics without derating |
| VWM | 26.0 V - ensures stable reverse blocking during normal 24 V system operation |
| ID @ VWM | <10 μA - minimizes standby power loss and avoids false triggering in low-current systems |
Pinout & Package
Package: DO-218AC - molded surface-mount case with integral metal heatsink acting as terminal; meets UL 94 V-0, RoHS-compliant, JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (smaller lead) | Cathode | Connected to protected line (e.g., battery rail); carries full surge current during clamping |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to large copper area for thermal management; serves as primary ground reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Junction passivation optimized | Reduces leakage drift and improves long-term stability under thermal stress |
| ISO7637-2 compliant | Meets automotive load dump test requirements (Pulse 5a/b) without external filtering |
| MSL Level 1 | Allows standard SMT reflow profile (peak 245 °C) without baking or special handling |
| Low VF = 1.8 V @ 100 A | Minimizes forward conduction loss during bidirectional surge events or reverse-bias leakage paths |
Applications
| Automotive Load Dump Protection | Industrial 24 V Power Rail Protection |
|---|---|
Use Scenario: Protecting engine control units (ECUs) and body control modules (BCMs) from alternator load dump transients in 24 V vehicle electrical systems. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed between battery rail and input filter stage. Use Value: Limits transient voltage to ≤42.1 V, preventing damage to downstream 40 V-rated DC-DC converters and microcontrollers. | Use Scenario: Safeguarding programmable logic controllers (PLCs) and industrial HMIs powered from 24 V DC supplies subject to inductive switching surges. IC Role / Device Role / Timing Role: Standoff protector on main 24 V input bus, operating continuously at 26 V VWM with <10 μA leakage. Use Value: Enables >175 °C ambient operation near motor drives, eliminating need for derating or forced cooling. |
| Truck & Bus Electrical Systems | Commercial Vehicle Telematics Units |
Use Scenario: Securing power inputs of heavy-duty vehicle telematics gateways exposed to extended-duration load dump pulses (10 ms exponential). IC Role / Device Role / Timing Role: High-energy clamping element rated for 5200 W (10/10 000 μs), mounted directly to chassis ground plane. Use Value: Handles 10 ms surges per ISO7637-2 Pulse 5b without thermal runaway due to RθJC = 0.90 °C/W. | Use Scenario: Protecting GNSS/GSM modules in fleet management devices where space-constrained PCB layout demands low-profile DO-218AC packaging. IC Role / Device Role / Timing Role: Surface-mount TVS integrated into compact 4-layer board with minimal keep-out area. Use Value: DO-218AC footprint reduces board area vs. DO-214AB while maintaining equivalent surge capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S26AHM3 | Same electrical specs; HM3 suffix indicates halogen-free molding compound and enhanced moisture resistance (MSL 1, 260 °C peak) | Preferred for new designs targeting IPC/JEDEC-compliant manufacturing and longer shelf-life storage | Select SM8S26AHM3 for production programs requiring halogen-free compliance and higher reflow margin |
| SMAJ26A | Lower PPPM (400 W), smaller DO-214AC package, no AEC-Q101 qualification, RθJC ≈ 50 °C/W | Suitable only for non-automotive, low-energy, ambient-temperature applications | Use SMAJ26A only in cost-sensitive consumer or industrial applications without automotive qualification needs |
Compared with SM8S26ATHE3/I, SM8S26AHM3 offers identical protection performance with improved manufacturability and environmental compliance, while SMAJ26A provides basic clamping at lower cost but lacks thermal robustness, surge capacity, and automotive qualification required for under-hood deployment.
Availability
SM8S26ATHE3/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial 24 V power rail hardening, and commercial vehicle telematics requiring stable component supply across extended product lifecycles.
Supply support for SM8S26ATHE3/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, MOSFETs, and optoelectronics for high-reliability applications.
The SM8SxxAT family was engineered specifically for automotive-grade transient suppression-delivering high-power clamping, extreme temperature resilience, and AEC-Q101 validation in surface-mount form factors.
FAQ
What is the maximum clamping voltage of SM8S26ATHE3/I under surge conditions?
The SM8S26ATHE3/I has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 157 A using the 10/1000 μs waveform. This value is measured at TC = 25 °C and guarantees that protected circuitry will not experience voltages exceeding this level during standardized surge events, making SM8S26ATHE3/I suitable for safeguarding 40 V-rated components in 24 V automotive systems.
Is SM8S26ATHE3/I qualified for automotive use?
Yes, SM8S26ATHE3/I is AEC-Q101 qualified and explicitly intended for automotive applications. Its qualification includes testing for temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock-all validated per the AEC-Q101 standard. The HE3 suffix denotes RoHS compliance and JESD201 Class 2 whisker resistance, confirming suitability for automotive production environments.
What does the "HE3" suffix mean in SM8S26ATHE3/I?
The "HE3" suffix in SM8S26ATHE3/I indicates a RoHS-compliant, AEC-Q101-qualified version with matte tin-plated leads meeting J-STD-002 and JESD22-B102 solderability standards. It also satisfies JESD201 Class 2 whisker resistance testing, ensuring long-term reliability in vibration-prone automotive applications where tin whisker growth could cause latent shorts.
Can SM8S26ATHE3/I be used in 12 V systems?
SM8S26ATHE3/I is optimized for 24 V nominal systems (VWM = 26.0 V), not 12 V. Using it in a 12 V application would result in excessive reverse leakage and premature conduction due to insufficient voltage margin between system operating voltage and VWM. For 12 V systems, SM8S13ATHE3/I (VWM = 13.0 V) or SM8S15ATHE3/I (VWM = 15.0 V) are appropriate alternatives within the same family.
What is the thermal resistance from junction to case for SM8S26ATHE3/I?
The SM8S26ATHE3/I has a typical thermal resistance from junction to case (RθJC) of 0.90 °C/W. This low value is achieved through its DO-218AC package design, where the metal heatsink serves as the anode and provides direct thermal path to the PCB copper pour or external heatsink-enabling efficient dissipation of 6600 W surge energy without thermal runaway.
SM8S26ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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):
- 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
SM8S26ATHE3/I FAQ
1.How can I place an order for SM8S26ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S26ATHE3/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 SM8S26ATHE3/I reliable?
The price and inventory of SM8S26ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S26ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S26ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S26ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S26ATHE3/I?
SM8S26ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S26ATHE3/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 SM8S26ATHE3/I?
For technical support, including SM8S26ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S26ATHE3/I requirements.
6.How does Aetrix verify that SM8S26ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S26ATHE3/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 SM8S26ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S26ATHE3/I?
All SM8S26ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S26ATHE3/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 SM8S26ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S26ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S26ATHE3/I Tags
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