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Vishay General Semiconductor - Diodes Division SM6T18CA-E3/52
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- Part No.:
- SM6T18CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CA-E3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:730
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Product details
Overview
SM6T18CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 21.2 V minimum breakdown voltage (VBR), and 600 W peak pulse power (10/1000 μs). It clamps transients to ≤32.5 V at 123 A peak pulse current and operates from −65 °C to +150 °C, protecting signal lines in automotive sensor units and industrial I/O interfaces.
For engineers reviewing the SM6T18CA-E3/52 datasheet, SM6T18CA-E3/52 pinout, SM6T18CA-E3/52 application, or SM6T18CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3/HM3 variants), low-inductance SMB package layout compatibility, and verified 32.5 V clamping voltage under standardized 10/1000 μs surge conditions.
Technical Context
The SM6T18CA-E3/52 implements a symmetric, bidirectional avalanche junction structure with glass-passivated chip construction, enabling identical electrical behavior in both polarities. Its clamping response is defined by a 10/1000 μs waveform test condition and exhibits low dynamic impedance due to optimized junction geometry and low-inductance leadframe design.
Thermal performance is characterized by RθJA = 100 °C/W (typ.) on 0.2" × 0.2" copper pads and RθJL = 20 °C/W, supporting reliable operation up to TJ = 150 °C. The device meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min) | 21.2 V - Minimum voltage at which avalanche breakdown begins (1 mA test current) |
| VC @ IPPM | 32.5 V - Clamped voltage across device during 123 A 10/1000 μs surge (limits downstream stress) |
| PPPM | 600 W - Peak transient power dissipation capability under standardized surge waveform |
| IPPM | 123 A - Maximum non-repetitive peak pulse current the device safely conducts |
| TJ max | +150 °C - Maximum allowable junction temperature for sustained reliability |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 5 mm × 5 mm pad layout |
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, RoHS-compliant, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical junction; accepts surge current in either direction |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical junction; functionally identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power (10/1000 μs) | Supports robust immunity against IEC 61000-4-5 Level 3/4 surges in industrial and automotive environments |
| Low clamping voltage (32.5 V @ 123 A) | Reduces voltage overshoot on protected ICs such as CAN transceivers or microcontroller GPIOs |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility at 260 °C peak without baking |
| Glass-passivated junction | Ensures stable VBR and leakage performance over temperature and long-term operation |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector interface to shunt transients before reaching sensor signal conditioning circuitry. Use Value: Limits induced voltage to ≤32.5 V, preserving integrity of 3.3 V/5 V ADC inputs and preventing latch-up in precision op-amps. | Use Scenario: Safeguarding RS-485 transceiver data lines in programmable logic controller (PLC) backplanes subject to EFT and surge events. IC Role / Device Role / Timing Role: Low-inductance SMB-mounted TVS placed adjacent to transceiver pins to minimize loop area and suppress common-mode surges. Use Value: Maintains signal integrity under 1 kV/500 A surge tests while adding <1 pF parasitic capacitance to differential pair. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side transient suppression on 12 V DC outputs of wall adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Bidirectional clamp across VOUT-GND to absorb coupling from primary-side switching noise and external ESD events. Use Value: Prevents overvoltage damage to USB-PD controllers and PMICs while meeting UL 62368-1 transient immunity requirements. | Use Scenario: Front-end protection of Ethernet PHY power rails (3.3 V, 1.8 V) in VoIP gateway line cards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on each rail to clamp fast-rising transients before they propagate into sensitive SerDes circuitry. Use Value: Achieves <10 ns response time and holds rail voltage within ±10 % of nominal during 10/1000 μs 600 W 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 |
|---|---|---|---|
| SMBJ18CA | Same VWM (18 V), higher PPPM (600 W), but larger SMBJ (DO-214AB) package (4.57 mm × 3.94 mm × 2.41 mm) | Requires PCB pad revision due to longer body and different thermal pad footprint | Select when higher surge margin is needed and board layout allows larger footprint |
| 1.5KE18CA | Same VWM and bidirectionality, but axial DO-15 package (lead pitch 5.33 mm, length 9.5 mm) | Not surface-mount compatible; unsuitable for automated assembly or high-density layouts | Select only for through-hole prototyping or legacy repair where SMT is unavailable |
Compared with SMBJ18CA and 1.5KE18CA, the SM6T18CA-E3/52 delivers identical electrical protection in a lower-profile SMB package optimized for space-constrained automotive and industrial PCBs, with verified AEC-Q101 qualification path and superior thermal performance per unit volume.
Availability
SM6T18CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line card surge suppression requiring stable component supply and full traceability.
Supply support for SM6T18CA-E3/52 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, automotive qualification, and high-volume manufacturability.
The SM6T Series is designed specifically for surface-mount transient voltage suppression in harsh environments, targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SM6T18CA-E3/52 under a 10/1000 μs surge?
The SM6T18CA-E3/52 clamps to a maximum of 32.5 V when subjected to its rated 123 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is SM6T18CA-E3/52 suitable for automotive applications?
Yes - the SM6T18CA-E3/52 is RoHS-compliant and part of the AEC-Q101-qualified SM6T family. While the -E3/52 suffix denotes commercial grade, the base SM6T18CA platform supports AEC-Q101 qualification via HE3/HM3 ordering codes. Designers targeting automotive use should specify SM6T18CAHE3_B or SM6T18CAHM3_B for certified parts.
What is the package type and mounting specification for SM6T18CA-E3/52?
The SM6T18CA-E3/52 uses the SMB (DO-214AA) surface-mount package with dimensions 4.57 mm × 3.94 mm × 2.20 mm. It features matte tin-plated leads, complies with J-STD-002 and JESD 22-B102 solderability standards, and is rated MSL Level 1 for unlimited floor life and 260 °C reflow peak temperature.
How does SM6T18CA-E3/52 differ from unidirectional SM6T18A-E3/52?
The SM6T18CA-E3/52 is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas SM6T18A-E3/52 is unidirectional with a visible cathode band and only clamps in reverse bias. Their VWM, VBR, and PPPM ratings are identical, but circuit placement and polarity awareness differ fundamentally.
What is the maximum operating junction temperature for SM6T18CA-E3/52?
The SM6T18CA-E3/52 has a maximum operating junction temperature (TJ) of +150 °C, as specified in Vishay document 88385. This rating enables reliable operation in under-hood automotive environments and high-temperature industrial enclosures when mounted on recommended 5.0 mm × 5.0 mm copper pads.
SM6T18CA-E3/52 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T18CA-E3/52 FAQ
1.How can I place an order for SM6T18CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CA-E3/52 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 SM6T18CA-E3/52 reliable?
The price and inventory of SM6T18CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T18CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CA-E3/52?
SM6T18CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CA-E3/52 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 SM6T18CA-E3/52?
For technical support, including SM6T18CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CA-E3/52 requirements.
6.How does Aetrix verify that SM6T18CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T18CA-E3/52 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 SM6T18CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T18CA-E3/52?
All SM6T18CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CA-E3/52, 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 SM6T18CA-E3/52 part is unused and in its original packaging.
Return procedure for SM6T18CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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