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Vishay General Semiconductor - Diodes Division SM8S22AHE3_A/I
- Part No.:
- SM8S22AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S22AHE3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,069
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Product details
Overview
SM8S22AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in 24 V systems. It features a 22 V stand-off voltage (VWM), 25.7 V nominal breakdown voltage (VBR), 35.5 V clamping voltage at 186 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). Its DO-218AB package supports AEC-Q101 qualification and 175 °C junction operation.
For engineers reviewing the SM8S22AHE3_A/I datasheet, SM8S22AHE3_A/I pinout, SM8S22AHE3_A/I application, or SM8S22AHE3_A/I equivalent, this page delivers verified electrical parameters, thermal performance data, automotive-grade reliability context, and direct alternative part guidance - all specific to the SM8S22AHE3_A/I variant with HE3 suffix and A/I packaging.
Technical Context
The SM8S22AHE3_A/I uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM) and low forward voltage drop (<1.8 V at 100 A), enabling efficient clamping during high-energy transients. Its junction temperature rating of −55 °C to +175 °C and MSL Level 1 rating support under-hood automotive deployment without derating.
It meets ISO 7637-2 surge requirements for load dump events and delivers 6600 W peak pulse power with 10/1000 μs waveform - validated at TA = 25 °C with thermal resistance RθJM = 0.35 °C/W to heatsink and RθJA = 55 °C/W on FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping begins; defines system-level DC bus compatibility in 24 V automotive networks. |
| VBR (min/typ/max) | 24.4 / 25.7 / 26.9 V at 5 mA - precise breakdown threshold ensures predictable turn-on during fast transients without premature conduction. |
| VC @ IPPM | 35.5 V at 186 A (10/1000 μs) - clamping voltage limits downstream IC stress during worst-case load dump surges. |
| PPPM | 6600 W (10/1000 μs) - enables single-device protection against high-energy ISO 7637-2 Pulse 5a load dump events. |
| TJ max | +175 °C - supports placement near heat sources (e.g., engine control units) without thermal derating penalties. |
| Polarity | Unidirectional - anode connected to heatsink; optimized for DC-biased protection where reverse conduction is not required. |
| AEC-Q101 | Qualified - certified for automotive electronic modules per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-218AB - thermally enhanced surface-mount case with metal heatsink terminal (anode), matte tin-plated leads, UL 94 V-0 molding compound, and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink) | Current return path and thermal interface | Directly mounted to PCB copper pour or heatsink; carries full surge current and dissipates >95 % of transient energy as heat. |
| Cathode (Lead 1) | Transient voltage sensing and clamping node | Connected to protected line (e.g., battery rail); initiates avalanche conduction when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable leakage <10 μA at VWM and <250 μA at TJ = 175 °C - critical for low-power always-on automotive modules. |
| DO-218AB thermal design | RθJM = 0.35 °C/W allows >90 % of 6600 W surge energy to transfer directly to heatsink - avoids PCB trace overheating. |
| AEC-Q101 qualification | Validated for 1000-cycle temperature cycling (−40 °C to +150 °C), 1000 h HTGB at 175 °C, and 1000 h HTRB - ensures field reliability in 15-year vehicle life. |
| ISO 7637-2 compliance | Tested per Pulse 5a (load dump) with 10 ms exponential waveform up to 35 V - meets OEM requirements for powertrain and body control ECUs. |
| HE3 suffix construction | RoHS-compliant, Pb-free, halogen-free, and JESD 201 Class 2 whisker resistant - satisfies Tier 1 automotive supply chain mandates. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Clamping |
|---|---|
|
Use Scenario: Protects microcontroller power rails from 120 V/100 ms load dump transients during alternator regulation failure in gasoline/diesel vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery feed and input filter capacitor; clamps within 1 ns after overvoltage onset. Use Value: Limits voltage seen by downstream LDOs and MCUs to ≤35.5 V - preventing latch-up or gate oxide damage in 3.3 V/5 V logic. |
Use Scenario: Shields LIN/CAN transceivers and window motor drivers from coupled transients induced by HVAC blower or seat actuator switching. IC Role / Device Role / Timing Role: Primary surge suppression device on 24 V main supply rail upstream of DC/DC converters; absorbs >95 % of 6600 W pulse energy. Use Value: Eliminates need for secondary TVS stages - reduces BOM count and PCB area while maintaining <10 μA quiescent leakage at 22 V. |
| ADAS Camera Power Conditioning | Electric Power Steering (EPS) ECU Transient Suppression |
|
Use Scenario: Secures 24 V input to image sensor power management ICs exposed to ignition noise and alternator ripple in front-facing camera modules. IC Role / Device Role / Timing Role: Fast-response clamping element with 25.7 V VBR tolerance ±5 % - ensures consistent turn-on across temperature and lifetime. Use Value: Maintains <1.8 V forward drop at 100 A surge - minimizes voltage sag during simultaneous camera sensor and ISP activation. |
Use Scenario: Guards motor driver ICs and position sensors against inductive kickback from 3-phase brushless steering motors during emergency stop events. IC Role / Device Role / Timing Role: High-reliability TVS mounted directly to aluminum heatsink in EPS housing; operates continuously at TJ = 150 °C ambient. Use Value: Sustains 175 °C junction rating with no derating - enables compact mechanical design without forced air cooling or thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S22AHM3_A/I | Same VWM/VBR/VC specs but HM3 suffix indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified with different plating process (no whisker test requirement). | Approved for new designs per Vishay's "Not For New Designs" notice for HE3 series; identical thermal and surge performance. | Select SM8S22AHM3_A/I for new automotive programs requiring latest material compliance and long-term supply assurance. |
| SMAJ22AHE3_A/I | Lower PPPM (400 W vs. 6600 W), smaller SMA package (RθJA = 85 °C/W), and lower IFSM (40 A vs. 700 A) - not suitable for load dump. | Limited to low-energy ESD and inductive switching protection in non-automotive industrial controls. | Only consider SMAJ22AHE3_A/I if surge energy is <500 W and board space constraints prohibit DO-218AB footprint. |
Compared with SM8S22AHE3_A/I, SM8S22AHM3_A/I offers identical electrical and thermal performance with updated environmental compliance, while SMAJ22AHE3_A/I provides only 6 % of the peak pulse power handling - making it unsuitable for automotive load dump protection despite shared VWM and polarity.
Availability
SM8S22AHE3_A/I is available at Aetrix Electronics and suitable for automotive power electronics, engine control units, and ADAS camera modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SM8S22AHE3_A/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM8SxxA family was engineered specifically for automotive load dump protection, combining high-temperature silicon design, robust DO-218AB packaging, and AEC-Q101 validation to replace legacy TVS solutions in powertrain and chassis ECUs.
FAQ
What is the clamping voltage of the SM8S22AHE3_A/I at its rated peak pulse current?
The SM8S22AHE3_A/I has a maximum clamping voltage (VC) of 35.5 V at 186 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions (TA = 25 °C) and ensures downstream circuitry remains within safe operating limits during ISO 7637-2 load dump events. The SM8S22AHE3_A/I maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient (0.086 %/°C).
Is the SM8S22AHE3_A/I suitable for new automotive designs?
No - Vishay explicitly marks the SM8S22AHE3_A/I as "Not For New Designs," recommending SM8S22AHM3_A/I as the approved replacement. The SM8S22AHE3_A/I remains available for legacy program support and repair, but new designs should use the HM3-suffix variant to ensure long-term supply and compliance with updated material requirements. The SM8S22AHE3_A/I retains full AEC-Q101 qualification and identical electrical specifications.
What does the "HE3_A/I" suffix indicate in SM8S22AHE3_A/I?
The "HE3" suffix denotes RoHS-compliant, halogen-free construction with matte tin-plated leads and JESD 201 Class 2 whisker resistance. "A/I" specifies packaging: 750-unit 13-inch plastic tape-and-reel with anode oriented toward sprocket holes. This configuration ensures automated placement compatibility and meets Tier 1 automotive assembly standards. The SM8S22AHE3_A/I is fully traceable and qualified per AEC-Q101.
How does the DO-218AB package of the SM8S22AHE3_A/I improve thermal performance compared to SMA or SMB?
The DO-218AB package of the SM8S22AHE3_A/I achieves RθJM = 0.35 °C/W by integrating a large metal heatsink terminal (anode) that mounts directly to PCB copper or external heatsinks - reducing thermal resistance by >75 % versus SMA packages. This enables the SM8S22AHE3_A/I to sustain 6600 W surges without exceeding 175 °C junction temperature, whereas SMA-packaged equivalents would fail catastrophically under identical conditions.
Does the SM8S22AHE3_A/I meet ISO 7637-2 requirements for automotive load dump?
Yes - the SM8S22AHE3_A/I is validated to meet ISO 7637-2 Pulse 5a (load dump) requirements, delivering 6600 W peak pulse power with a 10/1000 μs waveform and sustaining 5200 W with a 10/10,000 μs waveform. Its 35.5 V clamping voltage at 186 A ensures protected circuits remain below 40 V during worst-case transients. Test data is documented in Vishay's SM8SxxA datasheet (Document Number: 88387).
SM8S22AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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_A/I FAQ
1.How can I place an order for SM8S22AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22AHE3_A/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 SM8S22AHE3_A/I reliable?
The price and inventory of SM8S22AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S22AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S22AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22AHE3_A/I?
SM8S22AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22AHE3_A/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 SM8S22AHE3_A/I?
For technical support, including SM8S22AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22AHE3_A/I requirements.
6.How does Aetrix verify that SM8S22AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S22AHE3_A/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 SM8S22AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S22AHE3_A/I?
All SM8S22AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22AHE3_A/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 SM8S22AHE3_A/I part is unused and in its original packaging.
Return procedure for SM8S22AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S22AHE3_A/I Tags
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