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Vishay General Semiconductor - Diodes Division SM8S11-E3/2D
- Part No.:
- SM8S11-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S11-E3/2D.pdf
- Description:
- TVS DIODE 11VWM 20.1VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,171
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Product details
Overview
SM8S11-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor designed for automotive load dump protection. It features a 12.2 V (min) to 14.9 V (max) breakdown voltage, 11.0 V stand-off voltage, 328 A peak pulse current (10/1000 μs), 20.1 V clamping voltage at IPPM, and operates up to TJ = 175 °C.
For engineers reviewing the SM8S11-E3/2D datasheet, SM8S11-E3/2D pinout, SM8S11-E3/2D application, or SM8S11-E3/2D equivalent, this device is selected for high-reliability 12 V automotive power rail transient suppression where low leakage (<10 μA at VWM), high surge capability (6600 W), and AEC-Q101 qualification are required.
Technical Context
The SM8S11-E3/2D employs passivated anisotropic rectifier technology with junction passivation optimized for stable operation at TJ = 175 °C. Its DO-218AB package integrates a metal heatsink as anode terminal, enabling efficient thermal dissipation with RθJC = 0.90 °C/W.
It meets ISO 7637-2 load dump surge requirements under specified test conditions and complies with MSL Level 1 per J-STD-020 (peak reflow 245 °C). The device is rated for non-repetitive surge pulses only, with derating above TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 12.2 V (min) to 14.9 V (max) - defines minimum voltage at which avalanche conduction begins reliably |
| Stand-off Voltage (VWM) | 11.0 V - maximum continuous reverse voltage before significant leakage; sets operating margin below battery transients |
| Clamping Voltage (VC) | 20.1 V at IPPM - limits downstream circuit voltage during 328 A surge, protecting 24 V-tolerant ICs |
| Peak Pulse Power (PPPM) | 6600 W (10/1000 μs) - sustains high-energy load dump surges without failure |
| Junction Temp. Max (TJ) | 175 °C - enables placement near hot engine compartments in AEC-Q101-compliant automotive designs |
| Thermal Resistance (RθJC) | 0.90 °C/W - allows effective heat transfer to PCB copper or external heatsink via metal case |
| AEC-Q101 Qualified | Yes - validated for automotive electronic systems per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: DO-218AB - surface-mount, thermally enhanced case with integral metal heatsink (anode) and molded plastic body meeting UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery feed); carries full surge current during clamping |
| Lead 2 / Metal Heatsink | Anode | Primary thermal path and electrical return; must be soldered to large copper area for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Enables use on positive-rail-only systems without reverse-bias risk; simplifies layout vs. bidirectional TVS |
| Low leakage current | <10 μA at 11.0 V VWM and TJ = 175 °C - minimizes standby power loss in always-on automotive modules |
| High surge capability | 328 A peak pulse current (10/1000 μs) - withstands severe ISO 7637-2 Test Pulse 5a load dump events |
| Matte tin-plated leads | Solderable per J-STD-002 and JESD 22-B102; supports lead-free reflow with no whisker risk (JESD 201 Class 2) |
| RoHS & WEEE compliant | Fully compliant per Directive 2011/65/EU and 2002/96/EC - meets global automotive supply chain environmental mandates |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Protection |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load dump surges during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS clamps transients to ≤20.1 V within nanoseconds, shielding MCU, CAN transceivers, and analog sensors. Use Value: Prevents latch-up or permanent damage to 24 V-tolerant power management ICs during 6600 W surge events. |
Use Scenario: Shields BCM microcontroller and LIN transceivers from ignition-switch-induced transients. IC Role / Device Role / Timing Role: Acts as primary overvoltage clamp on main battery feed, responding in <1 ns to fast-rising spikes. Use Value: Maintains system uptime by limiting rail voltage excursion to safe levels during repetitive switching events. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Supply | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Secures 12 V supply to image sensor and ISP in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Suppresses ESD and load dump energy before it reaches low-noise LDOs and clock generators. Use Value: Ensures uninterrupted video stream by preventing reset or corruption caused by sub-100 ns transients. |
Use Scenario: Guards H-bridge gate drivers and current sense amplifiers against motor back-EMF surges. IC Role / Device Role / Timing Role: Absorbs inductive kickback energy from brushed/BLDC motor windings during PWM commutation. Use Value: Extends driver IC lifetime by limiting voltage stress on high-side MOSFETs and bootstrap circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-E3/5AT | Lower PPPM (400 W), SMA package, 11.1–12.3 V VBR range, RθJC ≈ 50 °C/W | Not suitable for load dump; limited to ESD and low-energy transients in consumer/industrial apps | Select when cost and board space are critical and surge energy is <500 W |
| TPSMA6L11A-Q1 | AEC-Q101 qualified, 11.1–12.3 V VBR, 600 W PPPM, SOD-123FL package, higher VF | Lacks DO-218AB thermal performance; insufficient for sustained 6600 W load dump | Choose for space-constrained automotive nodes where full load dump immunity is not required |
Compared with SMAJ11A-E3/5AT and TPSMA6L11A-Q1, the SM8S11-E3/2D delivers 16× higher surge power handling and 55× lower thermal resistance-making it the only viable option for under-hood automotive load dump protection where thermal robustness and energy absorption are non-negotiable.
Availability
SM8S11-E3/2D is available at Aetrix Electronics and suitable for automotive ECU, BCM, ADAS camera, and EPS applications requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for SM8S11-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, TVS, MOSFETs, and optoelectronics with emphasis on reliability and automotive-grade validation.
The SM8S series belongs to Vishay's PAR® (Protection and Regulation) family, engineered specifically for high-energy transient suppression in harsh automotive environments where AEC-Q101 compliance and 175 °C operation are mandatory.
FAQ
What is the clamping voltage of the SM8S11-E3/2D at its rated peak pulse current?
The SM8S11-E3/2D has a maximum clamping voltage (VC) of 20.1 V when subjected to its rated peak pulse current of 328 A using a 10/1000 μs waveform. This value is measured at TC = 25 °C and ensures downstream components see limited overvoltage during surge events. The SM8S11-E3/2D maintains this clamping performance across its full operating temperature range up to TJ = 175 °C.
Is the SM8S11-E3/2D suitable for bidirectional transient suppression?
No, the SM8S11-E3/2D is unidirectional only, with polarity marked by the cathode band on Lead 1 and the metal heatsink serving as the anode. It must be installed with correct orientation on positive-rail systems. For bidirectional protection, Vishay offers the SM8S11A variant, which has symmetrical breakdown characteristics but lower clamping voltage (18.2 V).
Does the SM8S11-E3/2D meet AEC-Q101 qualification requirements?
Yes, the SM8S11-E3/2D is explicitly AEC-Q101 qualified as stated in the Vishay datasheet (Document Number: 88387, Revision: 14-Sep-11). It has passed all required stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT), confirming suitability for automotive under-hood applications.
What is the thermal resistance from junction to case (RθJC) for the SM8S11-E3/2D?
The SM8S11-E3/2D has a typical thermal resistance of 0.90 °C/W from junction to case (RθJC), measured at TC = 25 °C. This low value is enabled by the DO-218AB package's integral metal heatsink (anode terminal), which must be soldered to ≥100 mm² of 2 oz copper for optimal thermal performance in automotive designs.
Can the SM8S11-E3/2D be used in non-automotive applications?
Yes, the SM8S11-E3/2D can be deployed in any high-reliability industrial or transportation application requiring 6600 W surge suppression and 175 °C operation-such as railway control units or off-highway vehicle ECUs. However, its AEC-Q101 qualification, ISO 7637-2 compliance, and DO-218AB thermal design are optimized for automotive load dump, not general-purpose use.
SM8S11-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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 328A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S11-E3/2D FAQ
1.How can I place an order for SM8S11-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S11-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 SM8S11-E3/2D reliable?
The price and inventory of SM8S11-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 SM8S11-E3/2D is usually 5 days.
3.What payment methods are accepted for SM8S11-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S11-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S11-E3/2D?
SM8S11-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S11-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 SM8S11-E3/2D?
For technical support, including SM8S11-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S11-E3/2D requirements.
6.How does Aetrix verify that SM8S11-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S11-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 SM8S11-E3/2D meets industry standards.
7.What is the process for return or replacement of SM8S11-E3/2D?
All SM8S11-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S11-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 SM8S11-E3/2D part is unused and in its original packaging.
Return procedure for SM8S11-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S11-E3/2D Tags
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