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Vishay General Semiconductor - Diodes Division SM5S18HE3/2D
- Part No.:
- SM5S18HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S18HE3/2D.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,302
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Product details
Overview
SM5S18HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor diode designed for automotive load dump protection in high-reliability 12 V systems. It features a 18.0 V stand-off voltage (VWM), 20.0–24.4 V breakdown range (VBR), 32.2 V clamping voltage at 112 A peak pulse current, and operates up to TJ = 175 °C.
For engineers reviewing the SM5S18HE3/2D datasheet, SM5S18HE3/2D pinout, SM5S18HE3/2D application, or SM5S18HE3/2D equivalent, this device is selected for its AEC-Q101 qualification, DO-218AB package thermal robustness, low leakage (<10 μA at VWM), and ISO7637-2 compliance in automotive power rail protection.
Technical Context
The SM5S18HE3/2D uses passivated anisotropic rectifier technology optimized for high-temperature stability and surge resilience. Its unidirectional polarity configures the metal heatsink as anode, enabling direct mounting to PCB ground planes for efficient thermal dissipation under repetitive load dump transients.
It delivers 3600 W peak pulse power (10/1000 μs), with derated capability down to 5 W steady-state dissipation on infinite heatsink. The 1.0 °C/W junction-to-case thermal resistance supports sustained operation at TC = 150 °C while maintaining clamping performance within specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 20.0 V / 24.4 V - Breakdown initiates within this range at 5 mA test current |
| VC @ IPPM | 32.2 V - Clamps 112 A transient to ≤32.2 V, limiting downstream IC stress |
| PPPM (10/1000 μs) | 3600 W - Withstands automotive load dump surges per ISO7637-2 without failure |
| TJ max. | 175 °C - Enables placement near hot engine-control electronics without derating |
| RθJC | 1.0 °C/W - Enables effective heat transfer to external heatsink or copper pour |
| ID @ VWM | <10 μA - Minimizes standby power loss in always-on vehicle modules |
Pinout & Package
Package: DO-218AB - Surface-mount, thermally enhanced case with metal heatsink terminal; RoHS-compliant, AEC-Q101 qualified, MSL Level 1 (245 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery rail); conducts during overvoltage |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to large copper area or chassis ground for thermal and electrical return path |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable leakage <10 μA at 175 °C, critical for long-life automotive modules |
| AEC-Q101 qualification | Validated for automotive under-hood environments including temperature cycling and humidity testing |
| ISO7637-2 compliance | Guarantees survivability against standardized 12 V system load dump waveforms |
| DO-218AB thermal design | 1.0 °C/W RθJC allows >3 kW surge handling without external heatsink in PCB layout |
| Uni-directional polarity | Simplifies protection topology by eliminating need for series blocking diode in DC systems |
Applications
| Engine Control Unit (ECU) Power Protection | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller and CAN transceivers from 12 V battery rail transients during alternator load dump. IC Role / Device Role / Timing Role: Primary clamping device placed directly at ECU input connector, shunting surge energy to chassis ground. Use Value: Limits transient voltage to ≤32.2 V at 112 A, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. | Use Scenario: Shields LIN bus interface ICs and power regulators from ignition-switching spikes and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on main 12 V input, coordinated with upstream fuse and downstream LC filter. Use Value: Maintains <10 μA leakage at 18 V, avoiding battery drain in sleep-mode vehicle states. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Safeguards image sensor and serializer ICs in rear-view cameras exposed to harsh under-vehicle electrical noise. IC Role / Device Role / Timing Role: First-line transient suppressor mounted adjacent to camera module connector, before DC/DC converter. Use Value: 175 °C junction rating ensures reliability in sealed, non-ventilated camera housings near exhaust paths. | Use Scenario: Protects H-bridge gate drivers and current-sense amplifiers from motor back-EMF and battery reversal events. IC Role / Device Role / Timing Role: Unidirectional TVS across motor supply rail, referenced to EPS control board ground plane. Use Value: 3600 W peak power rating absorbs 10 ms exponential load dump pulses without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5A | Lower PPPM (400 W), SMA package (RθJC ≈ 45 °C/W), bidirectional option available | Not rated for ISO7637-2; suited for general industrial I/O protection, not automotive load dump | Select only for cost-sensitive non-automotive designs where 3600 W surge capacity is unnecessary |
| TPSMD18A | Same DO-218AB package, 3600 W rating, but VBR min = 20.0 V (identical), VC = 32.4 V (±0.2 V higher) | Also AEC-Q101 qualified and ISO7637-2 compliant; identical thermal and surge specs | Drop-in alternative with same footprint and performance; verify manufacturer-specific qualification documentation |
Compared with SMAJ18A-E3/5A, SM5S18HE3/2D provides 9× higher surge power and automotive-grade thermal reliability; versus TPSMD18A, it offers identical clamping and qualification but differs in Vishay's proprietary passivation process and JEDEC tape-and-reel packaging (2D code).
Availability
SM5S18HE3/2D is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera modules, body control units, and electric power steering systems requiring stable component supply under AEC-Q101 compliance and ISO7637-2 validation.
Supply support for SM5S18HE3/2D 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, and optoelectronics for automotive, industrial, and computing markets.
The SM5Sxx family is engineered specifically for automotive load dump protection, combining high-temperature junction operation, ultra-low leakage, and industry-standard DO-218AB thermal packaging to meet stringent OEM requirements.
FAQ
What is the maximum clamping voltage of the SM5S18HE3/2D under surge conditions?
The SM5S18HE3/2D has a maximum clamping voltage (VC) of 32.2 V when subjected to its rated peak pulse current of 112 A using a 10/1000 μs waveform. This value is measured at TA = 25 °C and ensures downstream components see no more than 32.2 V during transient events. The SM5S18HE3/2D maintains this clamping performance across its full operating temperature range up to TJ = 175 °C.
Is the SM5S18HE3/2D qualified for automotive applications?
Yes, the SM5S18HE3/2D is AEC-Q101 qualified and meets ISO7637-2 surge test requirements for 12 V automotive systems. Its DO-218AB package, 175 °C junction rating, and low leakage (<10 μA at VWM) are validated for under-hood deployment. The SM5S18HE3/2D is explicitly intended for automotive load dump protection and appears in Vishay's automotive-grade product portfolio.
What does the "HE3/2D" suffix indicate in SM5S18HE3/2D?
The "HE3" suffix denotes RoHS-compliant, matte tin-plated leads meeting JESD201 Class 2 whisker resistance and J-STD-002 solderability standards. The "/2D" indicates packaging in 13-inch plastic tape-and-reel format with 750 units per reel and anode orientation toward the sprocket hole. This configuration is standard for automated SMT assembly of the SM5S18HE3/2D.
How does the DO-218AB package of the SM5S18HE3/2D improve thermal performance?
The DO-218AB package integrates a large metal heatsink terminal (anode) that serves as both electrical connection and primary thermal path. With a typical RθJC of 1.0 °C/W, the SM5S18HE3/2D transfers heat efficiently to PCB copper pours or chassis ground, enabling sustained 3600 W surge handling without external heatsinks. This thermal architecture is critical for the SM5S18HE3/2D's use in space-constrained automotive modules.
Can the SM5S18HE3/2D replace bidirectional TVS diodes in 12 V DC systems?
No - the SM5S18HE3/2D is unidirectional only, with the metal heatsink as anode. It must be oriented with cathode toward the protected line and anode to ground. For applications requiring reverse-polarity protection (e.g., jump-start scenarios), a separate series diode or bidirectional device is required. The SM5S18HE3/2D is optimized for forward-biased load dump clamping, not reverse-voltage blocking.
SM5S18HE3/2D 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:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 112A
- 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
SM5S18HE3/2D FAQ
1.How can I place an order for SM5S18HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S18HE3/2D 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 SM5S18HE3/2D reliable?
The price and inventory of SM5S18HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S18HE3/2D is usually 5 days.
3.What payment methods are accepted for SM5S18HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S18HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S18HE3/2D?
SM5S18HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S18HE3/2D 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 SM5S18HE3/2D?
For technical support, including SM5S18HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S18HE3/2D requirements.
6.How does Aetrix verify that SM5S18HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM5S18HE3/2D 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 SM5S18HE3/2D meets industry standards.
7.What is the process for return or replacement of SM5S18HE3/2D?
All SM5S18HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM5S18HE3/2D, 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 SM5S18HE3/2D part is unused and in its original packaging.
Return procedure for SM5S18HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S18HE3/2D Tags
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