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Vishay General Semiconductor - Diodes Division SM6S20-E3/2D
- Part No.:
- SM6S20-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM6S20-E3/2D.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,220
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Product details
Overview
SM6S20-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AB package, rated for 20 V stand-off voltage (VWM), 22.2–27.1 V breakdown (VBR), 35.8 V clamping at 128 A peak pulse current (10/1000 μs), 4600 W peak pulse power, and 175 °C junction temperature - designed for automotive load dump protection in engine control units and body electronics.
For engineers reviewing the SM6S20-E3/2D datasheet, SM6S20-E3/2D pinout, SM6S20-E3/2D application, or SM6S20-E3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB thermal performance (RθJC = 0.95 °C/W), AEC-Q101 qualification, ISO7637-2 compliance, and 10 μA max reverse leakage at VWM.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector with anode-connected heatsink configuration, optimized for high-energy transients in 12 V automotive systems. Its passivated anisotropic rectifier structure enables stable operation up to TJ = 175 °C and low forward voltage drop (VF ≤ 1.9 V at 100 A).
It delivers 4600 W surge capability under 10/1000 μs waveform and maintains 3600 W under extended 10/10 000 μs testing - meeting stringent load dump requirements per ISO7637-2 when mounted on appropriate heatsink. MSL level 1 rating confirms robust reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 22.2 V / 27.1 V at 5 mA - ensures reliable turn-on within defined tolerance band |
| VC @ IPPM | 35.8 V at 128 A (10/1000 μs) - defines worst-case clamped voltage seen by protected IC |
| PPPM | 4600 W (10/1000 μs) - supports high-energy load dump transients without failure |
| TJ max | +175 °C - enables placement near hot engine compartments or power stages |
| Polarity | Unidirectional - blocks reverse conduction until breakdown, suited for DC rail protection |
| RθJC | 0.95 °C/W - allows precise thermal design when heatsinked to PCB copper or metal chassis |
Pinout & Package
Package: DO-218AB - surface-mount, anode-heatsink configuration with matte tin-plated leads; meets UL 94 V-0, J-STD-002 solderability, and JESD 201 class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries full surge current during clamping |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to PCB ground plane or chassis; primary heat path |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier technology ensures stable VBR over lifetime and temperature |
| AEC-Q101 qualification | Validated reliability for automotive electronics including ECU, BCM, and ADAS modules |
| ISO7637-2 compliance | Withstands load dump pulses up to 35 V for 400 ms (test-condition dependent) |
| Low leakage | ≤10 μA at VWM (25 °C), ≤150 μA at VWM (175 °C) - minimizes standby power loss |
| MSL Level 1 | Rated for peak reflow of 245 °C - compatible with standard SMT assembly processes |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) CAN Bus Power Rail |
|---|---|
Use Scenario: Protects 12 V supply input of engine control units against alternator load dump surges up to +35 V for 400 ms. IC Role / Device Role / Timing Role: Clamping TVS diode placed between battery rail and DC-DC input, conducting only during overvoltage events. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤35.8 V, preventing latch-up or permanent damage. | Use Scenario: Shields 12 V power feeding isolated CAN transceivers in body control modules from ignition-induced transients. IC Role / Device Role / Timing Role: Unidirectional shunt protector on VCC line upstream of CAN power filter network. Use Value: Maintains <10 μA leakage at 12 V nominal, avoiding interference with low-power sleep modes while surviving 4600 W pulses. |
| Automotive Lighting Driver Supply | Start-Stop System Battery Interface |
Use Scenario: Guards LED driver ICs in headlamp modules from inductive kickback during relay switching and PWM dimming. IC Role / Device Role / Timing Role: Fast-response clamping device across input capacitor, activated within nanoseconds of transient onset. Use Value: Withstands 600 A non-repetitive forward surge (IFSM), enabling robustness against repeated lamp-switching events. | Use Scenario: Installed at battery interface of start-stop control units to absorb voltage spikes during cranking and alternator recovery. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V bus, thermally coupled to metal chassis via heatsink terminal. Use Value: RθJC = 0.95 °C/W enables effective heat dissipation during multi-pulse load dump sequences at elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5B (Vishay) | DO-214AC package; lower PPPM (400 W); VBR 22.2–24.5 V; bidirectional option available | Not AEC-Q101 qualified; unsuitable for automotive under-hood use | Select only for cost-sensitive industrial or consumer applications where 4600 W surge rating is unnecessary |
| TPSMD20A (Texas Instruments) | DO-218AB package; same VWM/VBR range; 4600 W PPPM; AEC-Q101 qualified; higher VC (37.5 V) | Compatible with identical layout but requires validation of 1.7 V higher clamping voltage impact on protected ICs | Drop-in replacement if system margin allows +1.7 V clamping; verify thermal derating curves match |
Compared with SMAJ20A-E3/5B and TPSMD20A, the SM6S20-E3/2D provides the highest surge robustness in its class with verified AEC-Q101 qualification and lowest thermal resistance - making it optimal for mission-critical automotive power rail protection where thermal management and long-term reliability are prioritized.
Availability
SM6S20-E3/2D is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and body control modules requiring stable component supply, AEC-Q101 compliance, and high-surge-capability TVS protection.
Supply support for SM6S20-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SM6Sxx series belongs to Vishay's PAR® (Protection Against Transients) family, engineered specifically for high-energy transient suppression in harsh automotive environments - particularly load dump, jump-start, and inductive switching scenarios.
FAQ
What is the clamping voltage of SM6S20-E3/2D at its rated peak pulse current?
The SM6S20-E3/2D has a maximum clamping voltage (VC) of 35.8 V when subjected to its specified peak pulse current of 128 A under the 10/1000 μs waveform. This value is measured at TC = 25 °C and represents the upper limit of voltage imposed on the protected circuit during surge events. The SM6S20-E3/2D maintains this clamping performance across its operational temperature range, supporting robust system-level protection design.
Is SM6S20-E3/2D qualified for automotive applications?
Yes, the SM6S20-E3/2D is AEC-Q101 qualified and rated for operation from -55 °C to +175 °C junction temperature. It meets ISO7637-2 surge test requirements for automotive load dump and is manufactured with junction passivation optimized for high-reliability environments. The SM6S20-E3/2D is explicitly intended for under-hood and powertrain applications where thermal stability and long-term surge endurance are critical.
What does the "-E3/2D" suffix indicate in SM6S20-E3/2D?
The "-E3" suffix denotes RoHS-compliant, matte tin-plated terminals meeting J-STD-002 solderability and JESD 201 class 2 whisker resistance. The "/2D" indicates packaging in 13-inch plastic tape and reel with 750 units per reel, anode oriented toward the sprocket hole. This configuration ensures consistent automated placement and thermal mounting alignment for the SM6S20-E3/2D in high-volume SMT lines.
Can SM6S20-E3/2D be used in bidirectional configurations?
No, the SM6S20-E3/2D is unidirectional only, with polarity defined as anode-connected heatsink and cathode as the signal lead. It conducts only during positive overvoltage events on the cathode side relative to anode. For bidirectional protection, Vishay offers the SM6S20A variant (with "A" suffix), which provides symmetrical clamping in both polarities - the SM6S20-E3/2D must not be substituted in such circuits without redesign.
How does the DO-218AB package of SM6S20-E3/2D improve thermal performance compared to SMA or SMB packages?
The DO-218AB package of the SM6S20-E3/2D features an integrated metal heatsink terminal (Lead 2) that serves as both electrical anode and primary thermal path, achieving a typical junction-to-case thermal resistance (RθJC) of 0.95 °C/W - significantly lower than SMA (≈25 °C/W) or SMB (≈15 °C/W). This enables the SM6S20-E3/2D to dissipate 4600 W surges more effectively, especially when mounted directly to copper pours or chassis ground, extending safe operating life in high-temperature automotive environments.
SM6S20-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 128A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
SM6S20-E3/2D FAQ
1.How can I place an order for SM6S20-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S20-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 SM6S20-E3/2D reliable?
The price and inventory of SM6S20-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 SM6S20-E3/2D is usually 5 days.
3.What payment methods are accepted for SM6S20-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S20-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S20-E3/2D?
SM6S20-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S20-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 SM6S20-E3/2D?
For technical support, including SM6S20-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S20-E3/2D requirements.
6.How does Aetrix verify that SM6S20-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM6S20-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 SM6S20-E3/2D meets industry standards.
7.What is the process for return or replacement of SM6S20-E3/2D?
All SM6S20-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM6S20-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 SM6S20-E3/2D part is unused and in its original packaging.
Return procedure for SM6S20-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S20-E3/2D Tags
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