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Vishay General Semiconductor - Diodes Division SM5S18AHE3/2D
- Part No.:
- SM5S18AHE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S18AHE3/2D.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,279
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Product details
Overview
SM5S18AHE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 18.0 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 29.2 V clamping voltage at 123 A peak pulse current, 3600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM5S18AHE3/2D datasheet, SM5S18AHE3/2D pinout, SM5S18AHE3/2D application, or SM5S18AHE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 1.0 °C/W), TJ = 175 °C operation, ISO7637-2 compliance, and low leakage (≤10 µA at VWM).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its unidirectional configuration places the heatsink as the anode terminal, enabling efficient thermal conduction to PCB copper during load dump transients.
The device delivers 3600 W peak pulse power with 10/1000 µs waveform and sustains 2800 W with 10/10,000 µs waveform-critical for automotive ISO7637-2 test profiles. It operates across –55 °C to +175 °C junction temperature and meets MSL Level 1 reflow requirements (245 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this range at 5 mA test current, ensuring predictable turn-on |
| VC @ IPPM | 29.2 V - Clamping voltage at 123 A peak pulse current; limits downstream voltage stress |
| PPPM (10/1000 µs) | 3600 W - Sustains high-energy transients typical of 12 V automotive load dump events |
| TJ max. | +175 °C - Enables placement near hot engine-control units without derating concerns |
| Leakage @ VWM | ≤10 µA at 25 °C - Minimizes standby power loss in always-on vehicle modules |
| Package | DO-218AB - Thermally enhanced surface-mount case with metal heatsink (anode) for direct PCB thermal coupling |
Pinout & Package
Package: DO-218AB - thermally optimized surface-mount case with integral metal heatsink (anode terminal); matte tin-plated leads; RoHS-compliant; MSL Level 1 (245 °C peak reflow); JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries clamped surge current to ground path |
| Lead 2 / Metal Heatsink | Anode | Primary thermal interface; must be soldered to large copper pour for effective heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test requirements including HTOL, TC, UHAST |
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature |
| Low forward voltage drop | VF ≤ 2.0 V at 100 A (8.3 ms half-sine) - reduces conduction loss during surge events |
| ISO7637-2 compliance | Meets Pulse 5a/b load dump immunity requirements for 12 V systems |
| RθJC = 1.0 °C/W | Enables >4 W power dissipation on modest PCB copper area at TC = 125 °C |
Applications
| Engine Control Unit (ECU) Protection | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller I/O and power rails from alternator load dump transients during battery disconnect/reconnect. IC Role / Device Role: Primary clamping element placed between 12 V supply rail and chassis ground. Use Value: Limits rail voltage to ≤29.2 V during 3600 W surges, preventing damage to 36 V-rated LDOs and CAN transceivers. |
Use Scenario: Shields LIN bus transceivers and window motor drivers from inductive switching spikes in door modules. IC Role / Device Role: Unidirectional TVS connected anode-to-ground, cathode-to-LIN line or motor driver output. Use Value: Low 10 µA leakage preserves sleep-mode current budget; DO-218AB heatsink anchors thermal path to inner-layer ground plane. |
| Advanced Driver Assistance Systems (ADAS) Power Supply | Infotainment Head Unit Power Input |
Use Scenario: Guards camera module power input against coupled transients from nearby solenoid actuators. IC Role / Device Role: First-line transient suppressor upstream of DC/DC converter input filter. Use Value: 175 °C rating allows placement adjacent to power converters; 29.2 V clamping protects 30 V input-rated buck controllers. |
Use Scenario: Suppresses ignition-switching noise and jump-start surges entering the main 12 V input of head units. IC Role / Device Role: Bulk TVS on main power entry point, mounted directly to heatsink pad on multilayer board. Use Value: 3600 W rating handles worst-case ISO7637-2 Pulse 5 (100 V, 400 ms); RθJC = 1.0 °C/W enables reliable operation at 85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18A | Same VWM (18 V), higher VC = 32.4 V at 113 A; DO-214AC package; RθJC ≈ 1.5 °C/W | Lower surge capability (400 W vs. 3600 W); suited for lower-energy ESD/surge, not load dump | Select SMAJ18A only for non-automotive 12 V systems where ISO7637-2 compliance is not required |
| ON Semiconductor 1.5SMC18A | Same VWM (18 V), VC = 29.2 V at 123 A; DO-214AB package; RθJC ≈ 1.2 °C/W; AEC-Q101 qualified | Lower PPPM (1500 W vs. 3600 W); insufficient for full load dump per ISO7637-2 | Choose 1.5SMC18A for space-constrained designs needing AEC-Q101 but not full load dump immunity |
Compared with SMAJ18A and 1.5SMC18A, the SM5S18AHE3/2D uniquely combines AEC-Q101 qualification, 3600 W surge rating, and DO-218AB thermal performance-making it the only option among the three validated for under-hood automotive load dump protection.
Availability
SM5S18AHE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power supplies, and infotainment head unit inputs requiring stable component supply and long-term lifecycle support.
Supply support for SM5S18AHE3/2D 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 SM5SxxA series is part of Vishay's PAR® TVS platform engineered specifically for automotive-grade transient suppression-emphasizing high-temperature operation, ISO7637-2 compliance, and robust thermal design for under-hood deployment.
FAQ
What is the clamping voltage of the SM5S18AHE3/2D at its rated peak pulse current?
The SM5S18AHE3/2D has a maximum clamping voltage (VC) of 29.2 V when subjected to its specified peak pulse current of 123 A using a 10/1000 µs waveform. This value is measured per the conditions defined in the Vishay datasheet Document Number 88382 and ensures downstream components see limited overvoltage during surge events. The SM5S18AHE3/2D maintains this clamping performance across its full operating temperature range.
Is the SM5S18AHE3/2D suitable for ISO7637-2 load dump protection?
Yes, the SM5S18AHE3/2D is explicitly designed and tested to meet ISO7637-2 surge requirements for 12 V automotive systems, including Pulse 5a and 5b load dump waveforms. Its 3600 W peak pulse power rating and thermal design (RθJC = 1.0 °C/W) enable reliable energy absorption without failure. The SM5S18AHE3/2D is AEC-Q101 qualified, confirming its suitability for automotive under-hood environments.
What does the HE3/2D suffix indicate in SM5S18AHE3/2D?
The HE3 suffix denotes RoHS-compliant construction and AEC-Q101 qualification, while the /2D indicates packaging in 13-inch plastic tape and reel with 750 units per reel and anode orientation toward the sprocket hole. This packaging format ensures consistent automated placement and supports traceable, whisker-resistant assembly per JESD201 Class 2. The SM5S18AHE3/2D is supplied ready for high-volume SMT production.
How does the DO-218AB package of the SM5S18AHE3/2D improve thermal performance compared to standard SMC packages?
The DO-218AB package of the SM5S18AHE3/2D integrates a large metal heatsink as the anode terminal, providing direct thermal conduction to PCB copper. With a typical junction-to-case thermal resistance (RθJC) of 1.0 °C/W-significantly lower than DO-214AB (~1.2 °C/W) or DO-214AC (~1.5 °C/W)-the SM5S18AHE3/2D sustains higher average power and survives repeated surges without thermal runaway. This makes the SM5S18AHE3/2D ideal for high-temperature automotive locations.
What is the maximum junction temperature rating for the SM5S18AHE3/2D?
The SM5S18AHE3/2D is rated for a maximum junction temperature (TJ max.) of +175 °C, verified per AEC-Q101 stress testing. This rating allows operation in demanding under-hood environments such as near engine control units or transmission control modules. The SM5S18AHE3/2D maintains electrical specifications-including VBR and VC-across the full –55 °C to +175 °C range without parameter shift beyond datasheet limits.
SM5S18AHE3/2D 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 123A
- Power - Peak Pulse:
- 3600W (3.6kW)
- 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
SM5S18AHE3/2D FAQ
1.How can I place an order for SM5S18AHE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S18AHE3/2D 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 SM5S18AHE3/2D reliable?
The price and inventory of SM5S18AHE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S18AHE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S18AHE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S18AHE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S18AHE3/2D?
SM5S18AHE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S18AHE3/2D 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 SM5S18AHE3/2D?
For technical support, including SM5S18AHE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S18AHE3/2D requirements.
6.How does Aetrix verify that SM5S18AHE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S18AHE3/2D 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 SM5S18AHE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S18AHE3/2D?
All SM5S18AHE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S18AHE3/2D, 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 SM5S18AHE3/2D part is unused and in its original packaging.
Return procedure for SM5S18AHE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S18AHE3/2D Tags
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