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Vishay General Semiconductor - Diodes Division SM6T18CAHE3_B/H
- Part No.:
- SM6T18CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHE3_B/H.pdf
- Description:
- 600W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,796
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Product details
Overview
SM6T18CAHE3_B/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 25.2 V clamping voltage (VC) at 24 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It provides robust ESD and surge protection for automotive sensor signal lines, I/O ports, and MOSFET gate drivers.
For engineers reviewing the SM6T18CAHE3_B/H datasheet, SM6T18CAHE3_B/H pinout, SM6T18CAHE3_B/H application, or SM6T18CAHE3_B/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.33), TJ = –65 °C to +150 °C operation, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SM6T18CAHE3_B/H implements a glass-passivated silicon junction optimized for fast response (<1 ns) to transient overvoltages and stable clamping under repetitive 10/1000 μs surges. Its bidirectional architecture enables symmetric suppression without polarity sensitivity, eliminating need for orientation during assembly.
Thermally, it features RθJA = 100 °C/W and RθJL = 20 °C/W, supporting reliable operation up to 150 °C junction temperature when mounted on 5.0 mm × 5.0 mm copper pads. It meets J-STD-020 MSL Level 1 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Verified breakdown threshold ensures predictable turn-on within ±5.5% tolerance. |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamping voltage limits downstream IC stress to safe levels during surge events. |
| PPPM | 600 W - Peak pulse power handling capability supports IEC 61000-4-5 Level 4 (4 kV) surge immunity compliance. |
| ID @ VWM | 1.0 μA - Ultra-low leakage preserves signal integrity and battery life in always-on sensor interfaces. |
| TJ Range | –65 °C to +150 °C - Enables deployment in under-hood automotive environments and industrial control enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TCT, and ESD HBM ≥ 8 kV. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied across device. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against IEC 61000-4-5 surges up to 4 kV without external series impedance. |
| Glass passivated chip junction | Ensures long-term stability of VBR and VC under thermal cycling and humidity exposure per AEC-Q101 requirements. |
| Low inductance SMB package | Minimizes voltage overshoot during fast transients (<1 ns rise time), critical for protecting high-speed digital interfaces. |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free reflow soldering without preconditioning or special handling in high-volume SMT production. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt surge energy before reaching MCU ADC or LIN transceiver. Use Value: Maintains signal fidelity under 100 V/μs transients while surviving >1000 surge cycles per AEC-Q101 stress profiles. |
Use Scenario: Safeguarding RS-485/RS-232 communication lines in PLC backplanes exposed to field wiring surges and ground potential differences. IC Role / Device Role / Timing Role: Low-capacitance TVS placed differential-line-to-ground to suppress common-mode surges without distorting data eye diagrams. Use Value: Clamps to ≤25.2 V within nanoseconds, preventing latch-up in transceivers while meeting IEC 61000-4-4 EFT immunity. |
| Consumer Power Adapter Input | MOSFET Gate Driver Protection |
Use Scenario: Secondary-side DC output protection in USB PD and Qi wireless charging adapters subject to user-induced hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS across VBUS and GND to absorb 8 kV contact ESD per IEC 61000-4-2 without degrading regulation loop stability. Use Value: 1.0 μA leakage at 18 V avoids quiescent current penalty in battery-backed systems; RoHS-compliant HE3 suffix ensures regulatory compliance. |
Use Scenario: Gate-source overvoltage suppression for 40 V N-channel MOSFETs driving solenoids and relays in motor control boards. IC Role / Device Role / Timing Role: Fast-clamping bidirectional device placed between gate and source to prevent dv/dt-induced Miller turn-on and gate oxide rupture. Use Value: 25.2 V clamping ensures gate voltage stays below 20 V absolute maximum rating even during 100 A inductive kickback events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V) and VC (25.2 V), but lower PPPM (400 W); SMA package (DO-214AC), larger footprint and higher RθJA (150 °C/W). | Not AEC-Q101 qualified; suitable for commercial-grade consumer or industrial use where automotive reliability is not required. | Select SMAJ18CA only if board space allows larger SMA package and automotive qualification is unnecessary. |
| 1.5KE18CA | Higher PPPM (1500 W), axial-leaded DO-15 package; significantly higher inductance and manual assembly requirement. | Designed for through-hole prototyping or legacy designs; incompatible with automated SMT lines and high-density layouts. | Choose 1.5KE18CA only for low-volume, non-automated builds where peak power >600 W is mandatory and board real estate is unconstrained. |
Compared with SMAJ18CA and 1.5KE18CA, SM6T18CAHE3_B/H delivers automotive-grade reliability in a compact SMB footprint with optimal thermal performance for high-volume SMT manufacturing-making it the preferred choice for next-generation automotive and industrial edge devices requiring validated surge resilience.
Availability
SM6T18CAHE3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial communication ports, consumer power adapter outputs, and MOSFET gate driver circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T18CAHE3_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 high-reliability diodes, rectifiers, and protection devices engineered for demanding automotive, industrial, and computing applications.
The SM6T Series was developed specifically for surface-mount transient suppression in space-constrained, high-surge environments-emphasizing AEC-Q101 qualification, low clamping voltage, and compatibility with modern SMT assembly processes.
FAQ
What does the "CA" suffix indicate in SM6T18CAHE3_B/H?
The "CA" suffix in SM6T18CAHE3_B/H denotes a bidirectional configuration, meaning the device clamps transient overvoltages equally in both polarities without requiring orientation during PCB placement. This differs from unidirectional variants (e.g., SM6T18A) that require cathode alignment and only suppress positive-going transients relative to ground. The CA version is ideal for AC-coupled or differential signal lines where polarity is undefined.
Is SM6T18CAHE3_B/H suitable for IEC 61000-4-5 surge testing?
Yes, SM6T18CAHE3_B/H is rated for 600 W peak pulse power with a 10/1000 μs waveform, enabling it to meet IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) when properly mounted on 5.0 mm × 5.0 mm copper pads per Vishay's recommended layout. Its 25.2 V clamping voltage at 24 A ensures protected circuitry remains within safe operating limits during standardized surge events.
What is the significance of the "HE3" suffix in SM6T18CAHE3_B/H?
The "HE3" suffix in SM6T18CAHE3_B/H indicates RoHS-compliant construction with AEC-Q101 qualification-certifying the device for automotive applications including engine control, ADAS, and body electronics. It confirms successful completion of stress tests such as high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD (≥8 kV), distinguishing it from commercial-grade "E3" variants.
How does the SMB (DO-214AA) package of SM6T18CAHE3_B/H compare to SMA (DO-214AC)?
The SMB package of SM6T18CAHE3_B/H measures 3.94 mm × 2.20 mm × 1.52 mm, offering a 30% smaller footprint and lower thermal resistance (RθJA = 100 °C/W vs. 150 °C/W for SMA) than SMA-packaged alternatives. Its reduced parasitic inductance improves clamping speed, and its MSL Level 1 rating supports direct 260 °C lead-free reflow-making SM6T18CAHE3_B/H more suitable for high-density, automotive-grade SMT assemblies.
What is the maximum reverse leakage current of SM6T18CAHE3_B/H at its rated standoff voltage?
The maximum reverse leakage current (ID) of SM6T18CAHE3_B/H is 1.0 μA at VWM = 18 V and TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-operated systems-critical for automotive always-on modules and IoT edge nodes where microamp-level quiescent current is tightly budgeted.
SM6T18CAHE3_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:
- -
- 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:
- 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)
SM6T18CAHE3_B/H FAQ
1.How can I place an order for SM6T18CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHE3_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 SM6T18CAHE3_B/H reliable?
The price and inventory of SM6T18CAHE3_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 SM6T18CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T18CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHE3_B/H?
SM6T18CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHE3_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 SM6T18CAHE3_B/H?
For technical support, including SM6T18CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHE3_B/H requirements.
6.How does Aetrix verify that SM6T18CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHE3_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 SM6T18CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T18CAHE3_B/H?
All SM6T18CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHE3_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 SM6T18CAHE3_B/H part is unused and in its original packaging.
Return procedure for SM6T18CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T18CAHE3_B/H Tags
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