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Vishay General Semiconductor - Diodes Division SM6T18AHE3_B/H
- Part No.:
- SM6T18AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18AHE3_B/H.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,782
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Product details
Overview
SM6T18AHE3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features 18 V breakdown voltage (VBR = 17.1–18.9 V at 1 mA), 25.2 V maximum clamping voltage (VC) at 24 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SM6T18AHE3_B/H datasheet, SM6T18AHE3_B/H pinout, SM6T18AHE3_B/H application, or SM6T18AHE3_B/H equivalent, key selection criteria include unidirectional polarity, 15.3 V stand-off voltage (VWM), low thermal resistance (RθJL = 20 °C/W), RoHS-compliant matte tin terminals, and MSL Level 1 moisture sensitivity rating.
Technical Context
The SM6T18AHE3_B/H operates as a unidirectional avalanche diode with glass-passivated junction, delivering precise overvoltage clamping during fast transients such as inductive load switching or ESD events. Its 10/1000 μs waveform response ensures robust energy absorption without degradation under repetitive surge conditions.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads, it achieves 600 W peak pulse power dissipation while maintaining low inductance and clamping ratio (VC/VBR ≈ 1.40). The device meets JESD22-B102 solderability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines reliable avalanche initiation threshold for consistent clamping onset |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak transient power handling capability without failure under standardized surge waveform |
| RθJL | 20 °C/W - thermal resistance from junction to lead enables effective heat transfer to PCB copper |
| TJ max. | +150 °C - maximum junction temperature supporting operation in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge or bias |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential side; avalanches into conduction when VAK > VBR, shunting surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low-inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), critical for protecting high-speed ICs |
| 600 W peak pulse power (10/1000 μs) | Withstands automotive load-dump and ISO 7637-2 Pulse 5a surges without degradation |
| MSL Level 1 (260 °C peak) | Enables standard reflow soldering without pre-baking or special handling |
| AEC-Q101 qualification (HE3 suffix) | Validates suitability for automotive powertrain, body control, and ADAS subsystems per stress test requirements |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 15.3 V. Use Value: Limits voltage to ≤25.2 V during 24 A transients, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted across differential signal pair or supply-to-ground to absorb ESD and switching noise. Use Value: Maintains signal integrity by suppressing ±8 kV contact ESD per IEC 61000-4-2 without latch-up or parameter shift. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Input-side surge suppression in wall-mounted AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side 12–24 V output rails before LDO regulators. Use Value: Absorbs 600 W surges from lightning-induced coupling on building wiring, meeting UL 62368-1 transient immunity. | Use Scenario: Overvoltage protection on -48 V DC distribution in telecom base station power shelves. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-rail to clamp positive-going transients on negative supply. Use Value: Withstands repeated 10/1000 μs surges up to 24 A while maintaining <1 μA leakage at -15.3 V reverse bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Same SMB package, identical VBR (17.1–18.9 V), but rated for 600 W with tighter VC spec (25.2 V max); no AEC-Q101 qualification | Commercial-grade only; not approved for automotive use per OEM requirements | Select when AEC-Q101 is not required and cost optimization is prioritized |
| 1.5SMC18A | Larger SMC (DO-214AB) package; same electrical specs but higher RθJA (110 °C/W vs. 100 °C/W); 1.5 kW rating requires derating to match 600 W capability | Less suitable for dense layouts; thermal performance inferior on minimal copper area | Choose only if board space allows larger footprint and legacy SMC inventory exists |
Compared with SMBJ18A-E3/52 and 1.5SMC18A, the SM6T18AHE3_B/H uniquely combines AEC-Q101 qualification, SMB form factor, and verified 600 W clamping performance-making it the preferred choice for new automotive designs requiring production traceability and extended temperature validation.
Availability
SM6T18AHE3_B/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer power adapters, and telecom DC power feeds requiring stable component supply with full AEC-Q101 compliance and RoHS/halogen-free assurance.
Supply support for SM6T18AHE3_B/H 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SM6T Series is engineered for robust transient suppression in harsh environments-specifically targeting automotive, industrial, and telecom systems where repeatable clamping, low leakage, and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the maximum clamping voltage of the SM6T18AHE3_B/H under a 10/1000 μs surge?
The SM6T18AHE3_B/H has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 24 A using the 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and represents the upper limit of voltage imposed on the protected circuit during surge events, ensuring downstream components remain within safe operating limits.
Is the SM6T18AHE3_B/H suitable for automotive applications?
Yes, the SM6T18AHE3_B/H is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024). It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to meet automotive reliability standards for powertrain, body electronics, and ADAS subsystems.
What does the "_B/H" suffix indicate in SM6T18AHE3_B/H?
The "_B/H" suffix in SM6T18AHE3_B/H denotes packaging configuration: "B" indicates revision level B per Vishay's internal coding, and "H" specifies the preferred package code for 7" diameter plastic tape and reel with 750 units per reel. This matches ordering information in Table "ORDERING INFORMATION" of document 88385.
How does the SM6T18AHE3_B/H differ from bidirectional variants like SM6T18CA?
The SM6T18AHE3_B/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SM6T18CA is bidirectional, lacks polarity marking, and clamps transients in both directions-making it suitable for AC lines or differential signal pairs where symmetric protection is required.
What is the thermal resistance from junction to ambient (RθJA) for the SM6T18AHE3_B/H?
The SM6T18AHE3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. This value assumes standard PCB layout per Vishay's recommended pad dimensions and is critical for calculating safe power derating above 25 °C ambient temperature.
SM6T18AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 24A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T18AHE3_B/H FAQ
1.How can I place an order for SM6T18AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18AHE3_B/H 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 SM6T18AHE3_B/H reliable?
The price and inventory of SM6T18AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18AHE3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T18AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18AHE3_B/H?
SM6T18AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18AHE3_B/H 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 SM6T18AHE3_B/H?
For technical support, including SM6T18AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18AHE3_B/H requirements.
6.How does Aetrix verify that SM6T18AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T18AHE3_B/H 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 SM6T18AHE3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T18AHE3_B/H?
All SM6T18AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18AHE3_B/H, 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 SM6T18AHE3_B/H part is unused and in its original packaging.
Return procedure for SM6T18AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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