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Vishay General Semiconductor - Diodes Division SM8S22AHM3/I
- Part No.:
- SM8S22AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S22AHM3/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,454
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Product details
Overview
SM8S22AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 22 V stand-off voltage (VWM), 25.7 V nominal breakdown voltage (VBR), 6600 W peak pulse power (10/1000 μs), 175 °C junction temperature rating, and DO-218AB package with anode-heatsink polarity.
For engineers reviewing the SM8S22AHM3/I datasheet, SM8S22AHM3/I pinout, SM8S22AHM3/I application, or SM8S22AHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where ISO 7637-2 compliance, low leakage (<10 μA at VWM), and AEC-Q101 qualification are mandatory design requirements.
Technical Context
The SM8S22AHM3/I employs passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress at TJ up to 175 °C. Its unidirectional configuration and heatsink-anode terminal arrangement enable direct thermal coupling to PCB copper planes for enhanced power dissipation.
It delivers 186 A peak pulse current (IPPM) at 10/1000 μs with a maximum clamping voltage of 35.5 V, ensuring downstream circuitry remains below safe overvoltage thresholds during load dump events. Thermal resistance junction-to-mount (RθJM) is 0.35 °C/W, confirming suitability for high-power transient suppression without external heatsinks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold for 12 V automotive rails. |
| VBR (nom) | 25.7 V - Breakdown voltage at 5 mA test current; defines onset of avalanche conduction during transients. |
| VC (max) | 35.5 V - Maximum clamping voltage at 186 A IPPM; ensures protected ICs remain within absolute maximum ratings during load dump. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capability; supports full ISO 7637-2 Pulse 5a load dump energy absorption. |
| ID (max @ VWM) | 10 μA - Reverse leakage at 22 V and 25 °C; minimizes standby power loss in always-on vehicle modules. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in engine bay environments without derating. |
| RθJM | 0.35 °C/W - Junction-to-mount thermal resistance; allows direct thermal path to heatsinked PCB layers for sustained surge duty cycles. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with integral metal heatsink tab (anode), RoHS-compliant matte tin plating, UL 94 V-0 rated molding compound, MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Heatsink Tab) | Positive DC rail connection / thermal interface | Must be soldered to ≥25 mm² copper pour for RθJM = 0.35 °C/W; electrically ties to cathode-side ground reference via PCB layout. |
| Cathode (Lead 1) | Transient current return path | Connected to protected circuit ground; carries full IPPM surge current during clamping; requires low-inductance trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
| Junction passivation optimized design | Reduces parameter drift over lifetime under thermal stress; maintains VBR stability across 1000+ hours at TJ = 150 °C. |
| Meets ISO 7637-2 Pulse 5a | Clamps 12 V system transients up to 65 V/100 ms exponential waveform without failure or parametric shift. |
| Low forward voltage drop | VF ≤ 1.8 V at 100 A (300 μs pulse); minimizes conduction loss during bidirectional fault conditions. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 245 °C peak; no moisture sensitivity baking required pre-assembly. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of microcontroller power inputs against alternator load dump spikes during battery disconnect events. IC Role / Device Role / Timing Role: Primary TVS clamp on 12 V input rail upstream of DC/DC converter. Use Value: Limits transient voltage to ≤35.5 V at 186 A, preventing latch-up or damage to 40 V-rated input stages in automotive-grade MCUs. |
Use Scenario: Safeguarding LIN bus transceiver power supply against coupled surges from window motor actuation. IC Role / Device Role / Timing Role: Unidirectional rail clamp on 12 V VCC line feeding LIN physical layer ICs. Use Value: Maintains <10 μA leakage at 22 V, avoiding excessive quiescent current in always-on BCM sleep modes. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Shielding image sensor and ISP power rails from ignition noise and starter motor kickback. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and LC filter on 12 V camera input. Use Value: Withstands repeated 6600 W surges while maintaining TJ ≤ 175 °C, enabling reliable operation in under-hood mounting locations. |
Use Scenario: Protecting gate driver ICs and motor phase sensing circuits from inductive switching transients in 3-phase BLDC control. IC Role / Device Role / Timing Role: High-energy TVS on main 12 V supply rail feeding EPS MCU and power stage. Use Value: Delivers 700 A IFSM surge current rating, surviving multiple cranking-cycle overcurrent events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S22AHE3_A/I | Same electrical specs and DO-218AB package; differs only in packaging suffix (HE3 vs HM3) and reel orientation (anode toward sprocket hole vs unspecified). | No functional difference; both meet AEC-Q101 and ISO 7637-2. HM3 denotes halogen-free, Pb-free, RoHS-compliant version with JEDEC-compliant tape/reel. | Select SM8S22AHM3/I when full halogen-free compliance and traceable material categorization (per doc#99912) are required. |
| SM8S24AHM3/I | Higher VWM (24 V) and VBR (28.1 V nominal); same 6600 W PPPM, 175 °C rating, and DO-218AB package. | Better suited for 24 V commercial vehicle systems or designs requiring margin above 22 V nominal rail; clamps at 38.9 V vs 35.5 V. | Choose SM8S24AHM3/I if system nominal voltage is 24 V or if higher VWM is needed to reduce leakage in high-temperature ambient conditions. |
Compared with SM8S22AHM3/I, SM8S22AHE3_A/I offers identical protection performance with alternate packaging logistics, while SM8S24AHM3/I provides higher stand-off voltage for 24 V architectures-both require no PCB redesign but differ in compliance scope and voltage margin.
Availability
SM8S22AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, body control module hardening, and ADAS camera power rail stabilization requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM8S22AHM3/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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM8SxxA family was engineered specifically for AEC-Q101-compliant automotive transient suppression, targeting load dump, ISO 7637-2 Pulse 5a, and high-temperature under-hood environments.
FAQ
What is the maximum clamping voltage of the SM8S22AHM3/I at its rated peak pulse current?
The SM8S22AHM3/I has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current (IPPM) of 186 A under the 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures protected downstream components remain within their absolute maximum voltage ratings during automotive load dump events. The SM8S22AHM3/I achieves this clamping performance while maintaining low leakage and high thermal robustness.
Is the SM8S22AHM3/I qualified for automotive applications?
Yes, the SM8S22AHM3/I is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 surge requirements, operates reliably from −55 °C to +175 °C, and is manufactured with junction passivation optimized for long-term stability under thermal cycling and humidity stress. The SM8S22AHM3/I is documented in Vishay's automotive-grade product portfolio and carries the "H" quality grade suffix indicating AEC-Q101 compliance.
What does the "HM3" suffix in SM8S22AHM3/I signify?
The "HM3" suffix in SM8S22AHM3/I indicates halogen-free, lead-free, RoHS-compliant construction with JEDEC-standard tape-and-reel packaging. "H" denotes AEC-Q101 qualification, "M3" specifies the material/environment category per Vishay's ordering nomenclature-confirming non-halogen, Pb-free terminations and compliance with document #99912. The SM8S22AHM3/I is not a generic variant; it is the designated production version for automotive supply chains requiring full environmental compliance.
Can the SM8S22AHM3/I be used in 24 V systems?
The SM8S22AHM3/I is specified for 22 V stand-off voltage and is optimized for 12 V automotive systems. While it may survive brief overvoltage in 24 V applications, its VWM is too low for reliable continuous operation-leakage increases significantly above VWM, risking thermal runaway. For 24 V systems, Vishay recommends SM8S24AHM3/I (24 V VWM) or higher variants. The SM8S22AHM3/I should not be substituted into 24 V designs without validation of leakage, clamping margin, and thermal performance.
What is the thermal resistance from junction to mount (RθJM) for the SM8S22AHM3/I?
The SM8S22AHM3/I has a typical junction-to-mount thermal resistance (RθJM) of 0.35 °C/W, measured per JEDEC 51-14 using the Transient Dual Interface Method. This low value reflects the DO-218AB package's integrated metal heatsink tab (anode), which must be soldered to a large copper area to realize full thermal performance. The SM8S22AHM3/I relies on this thermal path-not junction-to-ambient-for effective power dissipation during repetitive surge events.
SM8S22AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- 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-218AC
SM8S22AHM3/I FAQ
1.How can I place an order for SM8S22AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S22AHM3/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 SM8S22AHM3/I reliable?
The price and inventory of SM8S22AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S22AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S22AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S22AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S22AHM3/I?
SM8S22AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S22AHM3/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 SM8S22AHM3/I?
For technical support, including SM8S22AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S22AHM3/I requirements.
6.How does Aetrix verify that SM8S22AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S22AHM3/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 SM8S22AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S22AHM3/I?
All SM8S22AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S22AHM3/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 SM8S22AHM3/I part is unused and in its original packaging.
Return procedure for SM8S22AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S22AHM3/I Tags
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