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Vishay General Semiconductor - Diodes Division SM6T18CAHE3_A/I
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- Part No.:
- SM6T18CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHE3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,938
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Product details
Overview
SM6T18CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 600 W peak pulse power (10/1000 μs), and 150 °C max junction temperature. It clamps transients to ≤32.5 V at 24 A peak pulse current and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SM6T18CAHE3_A/I datasheet, SM6T18CAHE3_A/I pinout, SM6T18CAHE3_A/I application, or SM6T18CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage under 24 A surge, RoHS-compliant + AEC-Q101 qualification, SMB footprint compatibility, and 600 W transient power handling with minimal inductance.
Technical Context
The SM6T18CAHE3_A/I operates as a bidirectional voltage-clamping device with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable leakage performance and robust surge endurance.
Designed for surface-mount placement on PCBs with minimum 0.2" × 0.2" copper pads per terminal, it delivers 600 W peak pulse power per IEC 61000-4-5 (10/1000 μs) while maintaining low thermal resistance (RθJA = 100 °C/W) and meeting J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed breakdown threshold range for bidirectional conduction |
| VC @ IPPM | 32.5 V at 24 A (10/1000 μs) - Clamping voltage limiting downstream circuit stress during surge events |
| PPPM | 600 W - Peak transient power dissipation capability under standardized surge waveform |
| TJ max | +150 °C - Maximum allowable junction temperature supporting under-hood automotive use |
| RθJA | 100 °C/W - Thermal resistance defining temperature rise per watt under natural convection conditions |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | No functional polarity - either terminal serves as anode or cathode depending on transient direction |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and contributes to thermal dissipation via PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges without derating in standard layouts |
| AEC-Q101 qualification | Validated reliability for automotive powertrain, body control, and ADAS modules requiring extended temperature and lifetime validation |
| Glass passivated junction | Ensures stable reverse leakage (<1 μA at 18 V) and long-term parameter stability under thermal cycling |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, load dump) due to compact internal geometry |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients up to ±100 V. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across power rail and ground prior to DC/DC converter input. Use Value: Limits voltage to ≤32.5 V during 24 A surge, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules. IC Role / Device Role / Timing Role: Transient shunt on differential or single-ended signal lines exposed to motor switching noise. Use Value: Maintains signal integrity by clamping induced spikes before they saturate op-amp inputs or ADC front-ends. |
| Telecom Data Line Surge Suppression | Consumer USB Port ESD Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul links from lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed line-to-line and line-to-ground on twisted-pair interfaces. Use Value: Withstands repeated 600 W surges while preserving common-mode rejection and data rate integrity up to 10 Mbps. | Use Scenario: Adding secondary-level surge immunity to USB 2.0 VBUS and D+/D− lines in portable docking stations. IC Role / Device Role / Timing Role: Low-capacitance clamping device mounted adjacent to connector to intercept fast ESD events. Use Value: Delivers <1 μA leakage at 18 V and sub-33 V clamping, avoiding false disconnects or enumeration failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same SMB package, identical VWM/VC, but not AEC-Q101 qualified; RθJA = 110 °C/W vs. 100 °C/W | Commercial/industrial only; unsuitable for automotive under-hood deployment | Select when AEC-Q101 is not required and cost sensitivity outweighs thermal margin |
| 1.5KE18CA | Through-hole DO-201 package; same electrical specs but larger footprint and higher inductance | Legacy designs or high-reliability industrial systems where manual assembly or board-level ruggedness is prioritized | Choose only if existing PCB layout prohibits SMB replacement or thermal mass requirements exceed SMB capability |
Compared with SMBJ18CA and 1.5KE18CA, the SM6T18CAHE3_A/I uniquely combines AEC-Q101 qualification, optimized thermal resistance, and surface-mount scalability-making it the preferred choice for new automotive and high-volume industrial designs demanding validated reliability and automated assembly.
Availability
SM6T18CAHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom data line protection, and consumer USB port hardening requiring stable component supply and long-term lifecycle assurance.
Supply support for SM6T18CAHE3_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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered specifically for high-energy transient suppression in space-constrained, high-reliability environments-including automotive, industrial, and telecom infrastructure-where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SM6T18CAHE3_A/I under a 10/1000 μs surge?
The SM6T18CAHE3_A/I clamps to a maximum of 32.5 V when subjected to a 24 A peak pulse current with a 10/1000 μs waveform. This value is specified in the Vishay datasheet (Document Number 88385, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuits during standardized surge events. The clamping performance remains consistent across both polarities due to its bidirectional design.
Is the SM6T18CAHE3_A/I suitable for automotive applications?
Yes, the SM6T18CAHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use, as indicated by the "HE3" suffix and documentation in Vishay's SM6T Series datasheet. It supports operating junction temperatures up to +150 °C and is rated for under-hood environments including engine control modules, body electronics, and ADAS sensor interfaces where transient immunity and long-term reliability are critical.
What does the "CA" suffix mean in SM6T18CAHE3_A/I?
The "CA" suffix in SM6T18CAHE3_A/I denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SM6T18A), this version has no polarity marking and functions identically regardless of voltage polarity-making it ideal for AC signal lines, differential buses, and power rails where reverse transients may occur.
What is the standoff voltage (VWM) of the SM6T18CAHE3_A/I?
The standoff voltage (VWM) of the SM6T18CAHE3_A/I is 18 V, representing the maximum continuous DC or RMS voltage the device can withstand without entering avalanche conduction. This value is confirmed in the Electrical Characteristics table of the Vishay SM6T Series datasheet (88385), where SM6T18CA is listed with VWM = 18 V and VBR = 17.1–18.9 V at 1 mA test current.
Does the SM6T18CAHE3_A/I require a heatsink for standard operation?
No, the SM6T18CAHE3_A/I does not require an external heatsink for typical transient suppression duty cycles. Its thermal design relies on PCB copper pad area (minimum 0.2" × 0.2" per terminal) to dissipate energy, with a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W. Continuous power dissipation is limited to 5.0 W, but transient events are short-duration-so heat is absorbed by the junction and conducted into the board, not sustained in steady state.
SM6T18CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T18CAHE3_A/I FAQ
1.How can I place an order for SM6T18CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHE3_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 SM6T18CAHE3_A/I reliable?
The price and inventory of SM6T18CAHE3_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 SM6T18CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T18CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHE3_A/I?
SM6T18CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHE3_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 SM6T18CAHE3_A/I?
For technical support, including SM6T18CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHE3_A/I requirements.
6.How does Aetrix verify that SM6T18CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHE3_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 SM6T18CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T18CAHE3_A/I?
All SM6T18CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHE3_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 SM6T18CAHE3_A/I part is unused and in its original packaging.
Return procedure for SM6T18CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHE3_A/I Tags
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