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Vishay General Semiconductor - Diodes Division SM6S22-E3/2D
- Part No.:
- SM6S22-E3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM6S22-E3/2D.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,500
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Product details
Overview
SM6S22-E3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor diode designed for automotive load dump protection in 12 V systems. It features a 22.0 V stand-off voltage (VWM), 24.4–29.8 V breakdown range (VBR), 39.4 V clamping voltage at 117 A peak pulse current, 4600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood reliability.
For engineers reviewing the SM6S22-E3/2D datasheet, SM6S22-E3/2D pinout, SM6S22-E3/2D application, or SM6S22-E3/2D equivalent, this device is selected for high-surge, high-temperature (>150 °C case) automotive power rail protection where low leakage (<10 µA at VWM), low forward voltage (<1.9 V @ 100 A), and DO-218AB thermal robustness are critical.
Technical Context
The SM6S22-E3/2D operates as a unidirectional avalanche clamp, with anode connected to heatsink and cathode as signal terminal. Its junction passivation and anisotropic rectifier technology enable stable operation up to TJ = 175 °C and compliance with ISO7637-2 load dump waveforms.
It delivers 4600 W peak pulse power under 10/1000 µs surge conditions and maintains <10 µA reverse leakage at 22.0 V stand-off, supporting reliable overvoltage suppression in 12 V automotive electronics without false triggering during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold for 12 V automotive rails. |
| VBR (min/max) | 24.4 V / 29.8 V - Breakdown voltage range at 5 mA test current; defines guaranteed avalanche initiation window under production tolerance. |
| VC @ IPPM | 39.4 V - Clamping voltage at 117 A peak pulse current (10/1000 µs); determines maximum transient voltage seen by protected downstream ICs. |
| PPPM (10/1000 µs) | 4600 W - Peak pulse power handling capability; enables survival of severe ISO7637-2 load dump transients without failure. |
| ID @ VWM | <10 µA - Reverse leakage current at rated stand-off voltage; ensures minimal quiescent power loss and no interference with low-power sensor circuits. |
| TJ max. | 175 °C - Maximum junction temperature rating; supports placement near hot engine compartments and meets AEC-Q101 high-temp stress requirements. |
| RθJC | 0.95 °C/W - Junction-to-case thermal resistance; enables effective heat transfer to PCB copper pour or external heatsink in DO-218AB package. |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced plastic case with integral metal heatsink tab (anode), matte tin-plated leads, UL 94 V-0 rated molding compound, MSL Level 1 (245 °C reflow compatible).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Anode) | Anode connection / Heatsink interface | Electrically and thermally connected to metal heatsink tab; must be soldered to large copper area for thermal management and electrical return path. |
| Lead 2 (Cathode) | Cathode connection / Transient sensing node | Connected to protected line (e.g., battery rail); conducts surge current to anode/heatsink when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JESD22-A108 and AEC-Q101-004. |
| Junction passivation optimized design | Reduces parameter drift and leakage increase over lifetime at 175 °C junction temperature, extending service life in harsh environments. |
| Meets ISO7637-2 surge specification | Withstands defined load dump pulses (e.g., Pulse 5a) without degradation, enabling direct integration into automotive power distribution modules. |
| Low forward voltage drop | ≤1.9 V at 100 A surge current ensures minimal conduction loss during clamping, reducing thermal stress on the device and adjacent components. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 245 °C peak, eliminating moisture sensitivity concerns and pre-bake requirements. |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Rail |
|---|---|
Use Scenario: Protecting 12 V battery-fed circuits during alternator load dump events (ISO7637-2 Pulse 5a), where voltage spikes exceed 40 V for up to 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and ground, clamping transients before they reach sensitive microcontrollers and analog front-ends. Use Value: Limits peak rail voltage to ≤39.4 V during 117 A surges, preventing latch-up or permanent damage to 3.3 V/5 V logic and CAN transceivers. |
Use Scenario: Safeguarding ECU main power input against switching transients from fuel injectors, ignition coils, and solenoids. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the 12 V input stage, working in coordination with upstream fuses and downstream DC/DC converters. Use Value: Withstands 600 A non-repetitive forward surge (IFSM) and maintains <10 µA leakage at 22 V, ensuring stable bias for precision analog sensors and ADC references. |
| Body Control Module (BCM) Power Input | ADAS Camera Power Supply |
Use Scenario: Securing BCM power inputs exposed to long harness runs and multiple inductive loads across vehicle domains (lighting, door locks, HVAC). IC Role / Device Role / Timing Role: Standoff-rated TVS suppressing repetitive transients from relay switching and motor commutation noise. Use Value: Delivers 4600 W peak pulse power handling and 0.95 °C/W thermal resistance, enabling compact layout without forced air cooling. |
Use Scenario: Protecting 12 V input to camera module DC/DC converters in front-facing ADAS systems subject to engine bay thermal and electrical stress. IC Role / Device Role / Timing Role: First-line transient suppressor before buck converter, reducing EMI coupling and improving EMC immunity. Use Value: AEC-Q101 qualification and 175 °C junction rating ensure functional safety compliance (ISO 26262 ASIL-B support) and long-term stability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5AT | DO-214AC (SMA) package; lower PPPM (400 W); VBR = 24.4–27.0 V; same VWM (22 V); not AEC-Q101 qualified. | Limited to non-automotive industrial or consumer applications; unsuitable for under-hood use due to lower surge rating and thermal capability. | Select only for cost-sensitive, low-surge, ambient-temperature designs where DO-218AB mechanical robustness and AEC-Q101 are unnecessary. |
| 1.5SMC22A | DO-214AB (SMC) package; PPPM = 1500 W; VBR = 24.4–27.0 V; VWM = 22 V; AEC-Q101 not claimed; RθJC ≈ 2.5 °C/W. | Acceptable for moderate automotive transients but fails ISO7637-2 Pulse 5a margin; higher thermal resistance limits sustained surge duty cycle. | Use only if board space allows larger SMC footprint and application does not require full load dump compliance or 175 °C operation. |
Compared with SMAJ22A-E3/5AT and 1.5SMC22A, the SM6S22-E3/2D provides 11.5× and 3.1× higher peak pulse power respectively, superior thermal performance (0.95 vs. ~2.5 °C/W), and formal AEC-Q101 validation-making it the sole choice for production automotive load dump protection.
Availability
SM6S22-E3/2D is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) design, and body control module (BCM) development requiring stable component supply and long-term lifecycle assurance.
Supply support for SM6S22-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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM6Sxx series is part of Vishay's PAR® (Planar Avalanche Rectifier) TVS platform, engineered specifically for automotive-grade transient suppression with emphasis on high-temperature stability, surge survivability, and AEC-Q101 compliance.
FAQ
What is the polarity configuration of the SM6S22-E3/2D?
The SM6S22-E3/2D is a unidirectional transient voltage suppressor diode with anode connected to the metal heatsink tab (Lead 1) and cathode as the signal terminal (Lead 2). This configuration allows it to clamp positive transients on the cathode side relative to ground while blocking reverse voltage, making it ideal for 12 V automotive battery rail protection where polarity is fixed.
Does the SM6S22-E3/2D meet AEC-Q101 requirements?
Yes, the SM6S22-E3/2D is explicitly AEC-Q101 qualified per the Vishay datasheet (Document Number 88384, Revision 22-Jul-16). It has undergone stress testing including high-temperature reverse bias, temperature cycling, and surge endurance per JESD22-A108 and AEC-Q101-004, confirming suitability for automotive under-hood applications.
What is the maximum clamping voltage of the SM6S22-E3/2D under surge conditions?
The SM6S22-E3/2D has a maximum clamping voltage (VC) of 39.4 V at 117 A peak pulse current with a 10/1000 µs waveform. This value is measured and guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Can the SM6S22-E3/2D be used in 24 V systems?
No, the SM6S22-E3/2D is specified for 12 V nominal systems with a 22.0 V stand-off voltage (VWM). For 24 V systems, Vishay offers higher-voltage variants such as SM6S28A (VWM = 28.0 V) or SM6S33A (VWM = 33.0 V); using SM6S22-E3/2D in a 24 V environment would cause continuous conduction and thermal failure due to exceeding VWM.
What is the thermal resistance and recommended mounting for the SM6S22-E3/2D?
The SM6S22-E3/2D has a typical junction-to-case thermal resistance (RθJC) of 0.95 °C/W. To achieve rated power dissipation, the anode (metal heatsink tab) must be soldered to a minimum 100 mm² copper area on the PCB, preferably with thermal vias to inner ground planes. Lead-free reflow profile must comply with J-STD-020 MSL Level 1 (peak 245 °C).
SM6S22-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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 117A
- 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
SM6S22-E3/2D FAQ
1.How can I place an order for SM6S22-E3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S22-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 SM6S22-E3/2D reliable?
The price and inventory of SM6S22-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 SM6S22-E3/2D is usually 5 days.
3.What payment methods are accepted for SM6S22-E3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S22-E3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S22-E3/2D?
SM6S22-E3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S22-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 SM6S22-E3/2D?
For technical support, including SM6S22-E3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S22-E3/2D requirements.
6.How does Aetrix verify that SM6S22-E3/2D is sourced from the original manufacturer or authorized distributors?
All SM6S22-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 SM6S22-E3/2D meets industry standards.
7.What is the process for return or replacement of SM6S22-E3/2D?
All SM6S22-E3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM6S22-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 SM6S22-E3/2D part is unused and in its original packaging.
Return procedure for SM6S22-E3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S22-E3/2D Tags
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