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Vishay General Semiconductor - Diodes Division SM6S18HE3/2D
- Part No.:
- SM6S18HE3/2D
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM6S18HE3/2D.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,352
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Product details
Overview
SM6S18HE3/2D from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for automotive load dump protection. It features a 18.0 V stand-off voltage (VWM), 20.0–24.4 V breakdown range (VBR), 32.2 V clamping voltage at 143 A peak pulse current, 4600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM6S18HE3/2D datasheet, SM6S18HE3/2D pinout, SM6S18HE3/2D application, or SM6S18HE3/2D equivalent, key selection criteria include unidirectional polarity, DO-218AB package thermal performance (RθJC = 0.95 °C/W), TJ = 175 °C operation, ISO7637-2 compliance, and low leakage (≤10 μA at VWM).
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive electronics to divert high-energy transients-such as 12 V automotive load dump pulses-away from downstream circuitry. Its junction passivation and anisotropic rectifier technology enable stable performance up to 175 °C junction temperature and low forward voltage drop (VF ≤ 1.9 V at 100 A).
The DO-218AB package integrates a metal heatsink as the anode terminal, enabling efficient thermal conduction to PCB copper or external heatsinking. It meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing, supporting robust reflow assembly in automotive production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.0 V - Maximum continuous reverse operating voltage before clamping begins; defines system working voltage margin. |
| VBR min/max | 20.0 V / 24.4 V at IT = 5 mA - Confirmed breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 32.2 V at 143 A (10/1000 μs) - Clamping voltage limiting downstream component stress during worst-case surge. |
| PPPM | 4600 W (10/1000 μs) - Peak transient energy handling capacity validated for ISO7637-2 load dump simulation. |
| TJ max | 175 °C - Enables placement near hot engine control units without derating concerns. |
| Leakage ID | ≤10 μA at VWM, ≤150 μA at TJ = 175 °C - Ensures minimal standby power loss and signal integrity in always-on circuits. |
| Package | DO-218AB - Surface-mount package with integral metal heatsink (anode), UL 94 V-0 molding, and MSL Level 1 rating. |
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 or heatsink interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries transient current into the device during clamping. |
| Lead 2 / Metal Heatsink | Anode | Primary thermal and electrical return path; must be soldered to large copper area for effective heat dissipation and low-inductance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage across 175 °C operating range. |
| ISO7637-2 compliance | Meets automotive load dump surge immunity requirements using 10 ms exponential waveform test conditions. |
| MSL Level 1 | Zero floor life limitation; supports standard reflow profiles up to 245 °C peak without baking or special handling. |
| Low VF (≤1.9 V) | Minimizes forward conduction loss during bidirectional surge events and improves efficiency in clamp-to-rail configurations. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting microcontroller I/O and sensor interfaces from alternator load dump surges in 12 V vehicle electrical systems. IC Role / Device Role: Unidirectional clamping TVS placed between power rail and ground, triggered only on positive overvoltage events. Use Value: Limits rail voltage to ≤32.2 V during 4600 W transients, preventing latch-up or permanent damage to 3.3 V/5 V logic and analog front-ends. |
Use Scenario: Safeguarding LIN bus transceivers and power window motor drivers against battery reversal and jump-start induced spikes. IC Role / Device Role: Standoff-rated protector on 12 V supply input, leveraging 18.0 V VWM to avoid false triggering during normal cranking dips. Use Value: Maintains <10 μA leakage at nominal voltage while delivering 143 A surge current capability to absorb repetitive switching transients. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Input | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Shielding image sensor power rails from EMI-coupled transients generated by nearby solenoid actuators and ignition systems. IC Role / Device Role: Low-capacitance, high-power TVS mounted directly at camera module connector entry point. Use Value: Achieves 32.2 V clamping with 0.95 °C/W thermal resistance, enabling direct PCB copper heatsinking without discrete heatsinks. |
Use Scenario: Suppressing inductive kickback from brushed DC motors and H-bridge switching noise in EPS control modules. IC Role / Device Role: High-surge-capable unidirectional TVS connected across motor supply and chassis ground. Use Value: Withstands 600 A non-repetitive forward surge (IFSM) and maintains stability at 175 °C ambient, matching EPS under-hood thermal environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/5AT | DO-214AC package; lower PPPM (400 W); VBR = 20.0–22.1 V; RθJC ≈ 50 °C/W | Rated for general industrial use; not AEC-Q101 qualified; unsuitable for under-hood automotive deployment | Select when cost sensitivity outweighs automotive qualification and thermal performance requirements. |
| 1.5KE18A | DO-201 package; axial leaded; PPPM = 1500 W; VBR = 19.0–20.9 V; TJ max = 175 °C | Through-hole mounting only; higher thermal resistance; requires manual or wave soldering; no MSL rating | Choose only for legacy through-hole designs where board real estate and reflow compatibility are not constraints. |
Compared with SMAJ18A-E3/5AT and 1.5KE18A, the SM6S18HE3/2D delivers 11.5× higher surge power, integrated heatsink thermal path, AEC-Q101 validation, and SMT-ready DO-218AB packaging-making it the sole option qualified for modern automotive power rail protection where space, reliability, and thermal density are critical.
Availability
SM6S18HE3/2D is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power inputs, and electric power steering systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6S18HE3/2D 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 SM6S series belongs to Vishay's PAR® (Protected Automotive Rectifier) family, engineered specifically for harsh-environment automotive power line protection-including load dump, jump start, and ISO7637-2 compliance-with emphasis on high-temperature operation and AEC-Q101 qualification.
FAQ
What is the maximum clamping voltage of the SM6S18HE3/2D under standard test conditions?
The SM6S18HE3/2D has a maximum clamping voltage (VC) of 32.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 143 A. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The SM6S18HE3/2D maintains this clamping performance across its full operating temperature range, supporting robust design margins in automotive applications.
Is the SM6S18HE3/2D suitable for bidirectional transient suppression?
No, the SM6S18HE3/2D is a unidirectional TVS diode and is not rated for reverse standoff or clamping. Its polarity is fixed: the metal heatsink is the anode, and Lead 1 is the cathode. For bidirectional protection, a separate device such as a symmetric TVS array or back-to-back configuration would be required. The SM6S18HE3/2D is optimized exclusively for positive-going transients on 12 V automotive rails.
Does the SM6S18HE3/2D meet AEC-Q101 qualification requirements?
Yes, the SM6S18HE3/2D is explicitly AEC-Q101 qualified, as confirmed in the Vishay document 88384 (Revision: 22-Jul-16). This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock-ensuring suitability for automotive under-hood applications. The HE3 suffix further indicates RoHS compliance and JESD 201 Class 2 whisker resistance.
What is the thermal resistance from junction to case (RθJC) for the SM6S18HE3/2D?
The SM6S18HE3/2D has a typical thermal resistance of 0.95 °C/W from junction to case (RθJC), measured under standard conditions. This low value is enabled by the DO-218AB package's integral metal heatsink, which provides direct thermal conduction to PCB copper. Proper layout-using ≥100 mm² of 2 oz copper connected to the heatsink terminal-is required to realize this thermal performance in actual SM6S18HE3/2D implementations.
Can the SM6S18HE3/2D be used in non-automotive applications?
Yes, the SM6S18HE3/2D can be deployed in industrial and transportation applications requiring high-power, high-temperature transient suppression-such as railway signaling, off-highway equipment, or marine battery systems-provided its unidirectional polarity, 18.0 V VWM, and DO-218AB mounting constraints are respected. Its 175 °C TJ rating and 4600 W surge capacity make it viable beyond automotive, though AEC-Q101 qualification remains an automotive-specific assurance.
SM6S18HE3/2D 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):
- 143A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
SM6S18HE3/2D FAQ
1.How can I place an order for SM6S18HE3/2D through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S18HE3/2D 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 SM6S18HE3/2D reliable?
The price and inventory of SM6S18HE3/2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S18HE3/2D is usually 5 days.
3.What payment methods are accepted for SM6S18HE3/2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S18HE3/2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S18HE3/2D?
SM6S18HE3/2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S18HE3/2D 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 SM6S18HE3/2D?
For technical support, including SM6S18HE3/2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S18HE3/2D requirements.
6.How does Aetrix verify that SM6S18HE3/2D is sourced from the original manufacturer or authorized distributors?
All SM6S18HE3/2D 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 SM6S18HE3/2D meets industry standards.
7.What is the process for return or replacement of SM6S18HE3/2D?
All SM6S18HE3/2D units undergo pre-shipment inspection (PSI). If there is an issue with SM6S18HE3/2D, 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 SM6S18HE3/2D part is unused and in its original packaging.
Return procedure for SM6S18HE3/2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S18HE3/2D Tags
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