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Vishay General Semiconductor - Diodes Division SM8S22AHE3/2D
- Part No.:
- SM8S22AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S22AHE3/2D.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,660
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Product details
Overview
SM8S22AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, designed for automotive load dump protection. It features a 24.4 V minimum breakdown voltage (VBR), 22.0 V stand-off voltage (VWM), 35.5 V maximum clamping voltage (VC) at 186 A peak pulse current, and 6600 W peak pulse power (10/1000 µs), operating up to 175 °C junction temperature.
For engineers reviewing the SM8S22AHE3/2D datasheet, SM8S22AHE3/2D pinout, SM8S22AHE3/2D application, or SM8S22AHE3/2D equivalent, key selection criteria include its AEC-Q101 qualification, ISO7637-2 compliance for load dump transients, low leakage (<10 µA at VWM), and thermal resistance of 0.90 °C/W (junction-to-case).
Technical Context
The SM8S22AHE3/2D employs passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its unidirectional polarity configures the metal heatsink as anode, enabling direct mounting to PCB ground planes for efficient thermal dissipation under repetitive load dump events.
It delivers 6600 W peak pulse power with 10/1000 µs waveform and sustains 5200 W with 10/10 000 µs waveform-critical for automotive 12 V system protection. The device meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing, confirming reliability in automated assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 24.4 V - Ensures reliable triggering above normal 12 V system operating voltage during transients |
| VWM | 22.0 V - Maximum continuous reverse voltage before leakage exceeds 10 µA, compatible with 12 V nominal bus |
| VC @ IPPM | 35.5 V - Clamps load dump spikes to safe levels for downstream 36 V-rated ICs and sensors |
| IPPM (10/1000 µs) | 186 A - Sustains high-energy surges without degradation, validated per ISO7637-2 Pulse 5a/b |
| TJ max | 175 °C - Enables operation in under-hood automotive environments without derating |
| RθJC | 0.90 °C/W - Allows effective thermal coupling to heatsinked PCB copper, limiting junction rise to <160 °C at 8 W |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors including HTGB, HTRB, and TCT |
Pinout & Package
Package: DO-218AB - Surface-mount, single-ended, metal heatsink cathode configuration (anode on lead 1, cathode/heatsink on lead 2). Matte tin-plated leads, RoHS-compliant, MSL Level 1, LF peak 245 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Connects to protected line (e.g., battery feed); carries forward current during clamping |
| Lead 2 / Metal Heatsink | Cathode | Primary thermal path and electrical return; must be soldered to large copper pour for heat dissipation and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage over 15+ year automotive life |
| High surge capability | 6600 W (10/1000 µs) enables single-device protection against worst-case ISO7637-2 load dump without parallel staging |
| Low thermal resistance | 0.90 °C/W junction-to-case allows >8 W continuous dissipation with minimal PCB copper area |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and high-temperature reverse bias |
| MSL Level 1 rating | Enables standard reflow without dry-pack or baking, reducing manufacturing cost and handling complexity |
Applications
| Automotive Load Dump Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting 12 V vehicle electrical systems during alternator field-circuit interruption, generating up to 120 V/400 ms transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at main battery input to clamp surge energy before it reaches DC/DC converters and microcontrollers. Use Value: Limits clamped voltage to ≤35.5 V, safeguarding 36 V-rated power management ICs and avoiding need for higher-voltage-rated components. |
Use Scenario: Securing power rail of engine control units exposed to ignition noise, relay switching, and load dump in harsh under-hood environments. IC Role / Device Role / Timing Role: Primary transient suppression element at ECU's main 12 V input, working in coordination with bulk capacitance and upstream fusing. Use Value: Withstands 175 °C junction temperature and maintains <10 µA leakage at 22 V, ensuring long-term reliability without false triggering. |
| Body Control Module (BCM) Power Rail | Advanced Driver Assistance Systems (ADAS) Camera Power |
Use Scenario: Protecting BCM power inputs from transients induced by door lock motors, window lifters, and lighting loads. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS absorbing repetitive low-energy spikes while maintaining low standby leakage. Use Value: 10 µA max reverse leakage at VWM minimizes quiescent current drain, critical for always-on vehicle modules meeting ISO16750-2 sleep mode requirements. |
Use Scenario: Safeguarding 12 V supply to ADAS front-facing cameras subject to vibration-induced contact bounce and ESD from nearby harnesses. IC Role / Device Role / Timing Role: First-line transient suppressor on camera module input, preceding local LDO regulators and image sensor ICs. Use Value: 35.5 V clamping voltage prevents latch-up or damage to 3.3 V/5 V imaging processors, while DO-218AB package provides mechanical robustness against board flexure. |
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 (Vishay) | Lower PPPM (400 W vs. 6600 W), SMA package (RθJA ≈ 50 °C/W), VC = 35.5 V at 11.6 A | Intended for board-level ESD and low-energy transients-not load dump capable | Select SM8S22AHE3/2D when protecting against ISO7637-2 Pulse 5; choose SMAJ22A-E3/5AT only for IEC61000-4-2/4-4 level protection. |
| TPSMD22A (Texas Instruments) | Same DO-218AB package, AEC-Q101 qualified, but VC = 37.5 V at 175 A and PPPM = 6600 W (10/1000 µs) | Functionally interchangeable for load dump; slightly higher clamping voltage increases stress margin on downstream devices | SM8S22AHE3/2D offers tighter VBR tolerance (±5 % vs. ±10 % for TPSMD22A) and lower leakage at elevated temperature-preferred for precision-sensitive ECUs. |
Compared with SMAJ22A-E3/5AT and TPSMD22A, the SM8S22AHE3/2D uniquely combines 6600 W surge rating, 0.90 °C/W thermal resistance, and AEC-Q101 qualification in DO-218AB-enabling compact, thermally efficient load dump protection without derating or parallel devices.
Availability
SM8S22AHE3/2D is available at Aetrix Electronics and suitable for automotive load dump protection, engine control unit (ECU) power input, and body control module (BCM) power rail applications requiring stable component supply across extended production lifecycles.
Supply support for SM8S22AHE3/2D 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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SM8SxxA series is part of Vishay's PAR® TVS platform, engineered specifically for automotive-grade transient suppression in 12 V and 24 V systems-emphasizing high-temperature operation, surge robustness, and AEC-Q101 compliance.
FAQ
What is the clamping voltage of SM8S22AHE3/2D at its rated peak pulse current?
The SM8S22AHE3/2D has a maximum clamping voltage (VC) of 35.5 V when subjected to its peak pulse current (IPPM) of 186 A using a 10/1000 µs waveform. This value is measured and guaranteed per the Vishay datasheet revision 31-Aug-16, Document Number 88387, and ensures downstream 36 V-rated components remain within safe operating limits during load dump events.
Is SM8S22AHE3/2D qualified for automotive applications?
Yes, SM8S22AHE3/2D is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). Its 175 °C maximum junction temperature, MSL Level 1 rating, and ISO7637-2 compliance make it suitable for under-hood automotive use such as engine control units and body control modules.
What package type does SM8S22AHE3/2D use, and how is polarity configured?
SM8S22AHE3/2D uses the DO-218AB surface-mount package with unidirectional polarity. Lead 1 is the anode, and Lead 2 is the metal heatsink acting as the cathode. This configuration requires the heatsink to be soldered to a large copper area for thermal management and low-inductance grounding-critical for effective transient suppression.
Does SM8S22AHE3/2D meet ISO7637-2 requirements?
Yes, SM8S22AHE3/2D meets ISO7637-2 surge specification for automotive load dump protection, validated for Pulse 5a and 5b waveforms. Its 6600 W peak pulse power (10/1000 µs) and 5200 W (10/10 000 µs) ratings directly support compliance with the standard's energy requirements under defined test conditions.
What is the thermal resistance of SM8S22AHE3/2D, and why does it matter?
The SM8S22AHE3/2D has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W. This low value enables efficient heat transfer from the silicon die to the PCB copper via the metal heatsink, allowing sustained 8 W power dissipation without exceeding the 175 °C maximum junction temperature-essential for reliability in high-ambient automotive environments.
SM8S22AHE3/2D 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 186A
- 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-218AB
SM8S22AHE3/2D FAQ
1.How can I place an order for SM8S22AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22AHE3/2D 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 SM8S22AHE3/2D reliable?
The price and inventory of SM8S22AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S22AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM8S22AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22AHE3/2D?
SM8S22AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22AHE3/2D 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 SM8S22AHE3/2D?
For technical support, including SM8S22AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22AHE3/2D requirements.
6.How does Aetrix verify that SM8S22AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM8S22AHE3/2D 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 SM8S22AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM8S22AHE3/2D?
All SM8S22AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22AHE3/2D, 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 SM8S22AHE3/2D part is unused and in its original packaging.
Return procedure for SM8S22AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S22AHE3/2D Tags
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