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Vishay General Semiconductor - Diodes Division SM8S18AHE3_A/I
- Part No.:
- SM8S18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S18AHE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
SM8S18AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in DO-218AB package, rated for 18 V stand-off voltage (VWM), 21.1 V nominal breakdown (VBR), and 6600 W peak pulse power (10/1000 μs), designed for automotive load dump protection in high-reliability 12 V systems.
For engineers reviewing the SM8S18AHE3_A/I datasheet, SM8S18AHE3_A/I pinout, SM8S18AHE3_A/I application, or SM8S18AHE3_A/I equivalent, key selection criteria include AEC-Q101 qualification, TJ = 175 °C operation, low leakage (<10 μA at VWM), and ISO7637-2 compliance for automotive transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress. Its unidirectional polarity and heatsink-anode configuration enable direct mounting to thermal planes for efficient heat dissipation during 10/1000 μs load dump events.
The device delivers 226 A peak pulse current (IPPM) at 29.2 V clamping voltage (VC) with 0.083 %/°C VBR temperature coefficient, supporting robust overvoltage protection across -55 °C to +175 °C junction range without derating below 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum reverse working voltage before conduction; defines safe operating margin in 12 V automotive systems. |
| VBR (nom) | 21.1 V - Breakdown voltage at 5 mA test current; ensures reliable triggering above normal system transients. |
| VC @ IPPM | 29.2 V - Clamping voltage at 226 A peak pulse; limits downstream IC stress during ISO7637-2 load dump. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling; supports single-event automotive load dump surges per SAE J1113-11. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot engine-control units without thermal derating. |
| Leakage @ VWM | <10 μA - Low reverse leakage at 18 V; minimizes standby power loss in always-on vehicle modules. |
| Package | DO-218AB - Thermally optimized surface-mount case with metal heatsink anode; enables PCB-level thermal management. |
Pinout & Package
DO-218AB package features two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). The metal heatsink serves as both electrical anode connection and primary thermal path to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into device during clamping. |
| Lead 2 / Metal Heatsink | Anode | Electrically and thermally connected to ground plane; provides low-inductance return path and thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD47. |
| Junction passivation | Stable VBR drift <±5 % after 1000 hrs at TJ = 175 °C; prevents parametric shift in harsh environments. |
| MSL Level 1 | Reflow-compatible up to 245 °C peak; eliminates moisture sensitivity concerns in standard SMT assembly. |
| ISO7637-2 compliant | Withstands Pulse 5a (load dump) up to 40 V/100 ms exponential waveform without failure. |
| Low VF at high IF | 1.8 V max forward voltage at 100 A; reduces conduction losses during bidirectional fault conditions. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of engine control units against alternator load dump transients up to 40 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamps overvoltage within 1 ns to limit input to downstream DC/DC converters and microcontrollers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies by holding clamped voltage ≤29.2 V during 6600 W surges. | Use Scenario: Shields CAN transceivers on body control modules from coupled transients induced by nearby relay switching. IC Role / Device Role / Timing Role: Fast-response TVS absorbs energy before it propagates onto differential CANH/CANL lines. Use Value: Maintains signal integrity by limiting common-mode surge voltage to <30 V while preserving CAN bus timing margins. |
| ADAS Camera Power Rail | Infotainment Head Unit USB Port |
Use Scenario: Guards front-facing ADAS camera module power input against battery disconnection spikes in start-stop systems. IC Role / Device Role / Timing Role: Standoff-rated TVS blocks transients >18 V while remaining invisible to normal 12.5–14.5 V operation. Use Value: Enables uninterrupted video streaming by preventing brownout resets caused by sub-100 ns transients. | Use Scenario: Protects USB Type-C power delivery circuitry in infotainment head units from reverse-battery and jump-start surges. IC Role / Device Role / Timing Role: High-surge-capacity TVS diverts >200 A pulses away from USB PD controllers and port switches. Use Value: Avoids costly field failures by sustaining 700 A IFSM non-repetitive surge without bond-wire fusing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S18AHM3_A/I | Same electrical specs but HM3 suffix indicates enhanced MSL level 1 reflow profile and whisker-resistant plating. | Identical automotive use cases; preferred for new designs requiring latest process revision. | Select SM8S18AHM3_A/I for new designs-SM8S18AHE3_A/I is Not For New Designs per Vishay documentation. |
| SMAJ18A | Lower PPPM (400 W vs. 6600 W); DO-214AC package; no AEC-Q101 qualification. | Limited to non-automotive industrial or consumer applications with lower surge severity. | Only suitable where ISO7637-2 compliance and 175 °C operation are not required. |
Compared with SM8S18AHE3_A/I, SM8S18AHM3_A/I offers identical protection performance with improved manufacturability and lifecycle support, while SMAJ18A provides cost-effective basic clamping at significantly reduced surge capacity and qualification scope.
Availability
SM8S18AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera modules, and body control unit design requiring stable component supply and long-term obsolescence management.
Supply support for SM8S18AHE3_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 capability, AEC-Q101 qualification, and industry-leading 6600 W surge rating in a thermally efficient DO-218AB package.
FAQ
Is SM8S18AHE3_A/I AEC-Q101 qualified?
Yes, SM8S18AHE3_A/I is AEC-Q101 qualified per Vishay's official documentation. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge-to ensure reliability in automotive under-hood environments up to 175 °C junction temperature.
What does the HE3 suffix mean in SM8S18AHE3_A/I?
The HE3 suffix in SM8S18AHE3_A/I indicates RoHS-compliant, halogen-free construction with matte tin-plated leads that meet J-STD-002 solderability and JESD22-B102 whisker resistance Class 2 requirements-critical for automotive manufacturing and long-term field reliability.
Can SM8S18AHE3_A/I replace SM8S18AHM3_A/I in existing designs?
SM8S18AHE3_A/I and SM8S18AHM3_A/I share identical electrical specifications and DO-218AB mechanical form factor, but HM3 denotes an updated process with enhanced MSL level 1 reflow tolerance and whisker mitigation. While functionally interchangeable, Vishay marks SM8S18AHE3_A/I as "Not For New Designs" and recommends HM3 for new projects.
Does SM8S18AHE3_A/I meet ISO7637-2 Pulse 5a requirements?
Yes, SM8S18AHE3_A/I meets ISO7637-2 Pulse 5a (load dump) requirements when properly mounted on a thermally adequate PCB. Its 6600 W peak pulse power rating and 29.2 V clamping voltage enable compliance with the 40 V/100 ms exponential waveform under defined test conditions.
What is the thermal resistance of SM8S18AHE3_A/I from junction to mount (RθJM)?
The junction-to-mount thermal resistance (RθJM) of SM8S18AHE3_A/I is 0.35 °C/W, measured using JEDEC®51-14 Transient Dual Interface Method. This low value reflects the DO-218AB package's metal heatsink anode, enabling efficient heat transfer to the PCB ground plane.
SM8S18AHE3_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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 226A
- 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
SM8S18AHE3_A/I FAQ
1.How can I place an order for SM8S18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S18AHE3_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 SM8S18AHE3_A/I reliable?
The price and inventory of SM8S18AHE3_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 SM8S18AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM8S18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S18AHE3_A/I?
SM8S18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S18AHE3_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 SM8S18AHE3_A/I?
For technical support, including SM8S18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S18AHE3_A/I requirements.
6.How does Aetrix verify that SM8S18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM8S18AHE3_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 SM8S18AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM8S18AHE3_A/I?
All SM8S18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S18AHE3_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 SM8S18AHE3_A/I part is unused and in its original packaging.
Return procedure for SM8S18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S18AHE3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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