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Vishay General Semiconductor - Diodes Division SM6T18CAHE3/52
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- Part No.:
- SM6T18CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T18CAHE3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,540
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Product details
Overview
SM6T18CAHE3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 25.2 V max clamping voltage 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 and power rails.
For engineers reviewing the SM6T18CAHE3/52 datasheet, SM6T18CAHE3/52 pinout, SM6T18CAHE3/52 application, or SM6T18CAHE3/52 equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low clamping ratio (1.40), 150 °C junction temperature rating, and compatibility with automated SMT placement on standard PCB pads.
Technical Context
The SM6T18CAHE3/52 operates as a symmetric bidirectional TVS, delivering identical clamping performance in both polarities due to its CA-suffix construction. Its glass-passivated junction ensures stable breakdown behavior under repetitive transients, while low inductance (<1 nH typical) supports fast response to sub-microsecond surges.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and is qualified for operation from –65 °C to +150 °C. Thermal resistance is specified at RθJA = 100 °C/W (on 0.2" × 0.2" copper pads), enabling predictable derating above 25 °C ambient per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working margin below clamping threshold. |
| VBR min / max | 17.1 V / 18.9 V at 1 mA - Verified breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 25.2 V at 24 A (10/1000 μs) - Clamping voltage limits downstream IC stress during 600 W surge events. |
| PPPM | 600 W - Peak pulse power handling capability per standardized 10/1000 μs waveform per IEC 61000-4-5. |
| TJ max | +150 °C - Enables use in under-hood automotive environments without thermal shutdown. |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.2 mm height and 3.94 mm length; compatible with IPC-7351B footprint. |
Pinout & Package
SMB (DO-214AA) package: cathode/anode terminals are symmetrical and unmarked for bidirectional operation; no polarity band; matte tin-plated leads compliant with J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts surge current during negative-going transients; clamps to ≤25.2 V relative to cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts surge current during positive-going transients; clamps to ≤25.2 V relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VC in both directions enables single-device protection of AC-coupled or floating signal lines. |
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT, supporting OEM compliance. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges on 50 Ω source impedance without degradation. |
| Low clamping ratio (VC/VBR) | 1.40 (25.2 V / 18.0 V avg) minimizes overvoltage stress on protected MOSFET gates or MCU I/O pins. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Lines |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp limiting transients to ≤25.2 V during ±100 V spikes. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC front-ends without adding series resistance. | Use Scenario: Safeguarding differential CAN_H/CAN_L signals against ESD (IEC 61000-4-2) and surge (IEC 61000-4-5) in factory automation nodes. IC Role / Device Role / Timing Role: Symmetric clamping device placed across bus pair to shunt common-mode transients. Use Value: Maintains signal integrity by clamping within ±25.2 V while preserving <10 pF junction capacitance at zero bias. |
| Consumer Power Adapter Inputs | Telecom DC Power Feeds |
Use Scenario: Input-stage surge suppression on 19 V laptop adapter secondary-side rectifier outputs. IC Role / Device Role / Timing Role: Secondary-side TVS absorbing line-to-ground transients induced by nearby lightning strikes. Use Value: Limits voltage overshoot to 25.2 V during 600 W pulses, preventing overvoltage failure of downstream DC-DC controllers. | Use Scenario: Overvoltage protection on -48 V telecom power distribution boards subjected to accidental AC mains contact. IC Role / Device Role / Timing Role: Bidirectional clamp referenced to system ground, conducting fault current in either polarity. Use Value: Withstands 100 A IFSM half-sine surge (10 ms), enabling robust protection without fuse coordination. |
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), lower PPPM (400 W), larger SMA package (DO-214AC), higher RθJA (140 °C/W). | Not AEC-Q101 qualified; suitable for commercial-grade consumer power supplies but not automotive. | Select when cost sensitivity outweighs automotive qualification and 600 W surge headroom is unnecessary. |
| 1.5KE18CA | Higher PPPM (1500 W), axial leaded DO-15 package, slower response due to higher parasitic inductance. | Requires through-hole assembly; incompatible with high-density SMT layouts and automated placement. | Choose only for legacy board redesigns where footprint change is prohibited and higher surge margin is critical. |
Compared with SMAJ18CA and 1.5KE18CA, the SM6T18CAHE3/52 delivers automotive-grade reliability in a compact SMB footprint with optimal clamping efficiency (VC/VBR = 1.40) and full AEC-Q101 validation-making it the preferred choice for new automotive and industrial SMT designs requiring 600 W surge immunity.
Availability
SM6T18CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, telecom power feeds, and consumer adapter inputs requiring stable component supply and long-term lifecycle support.
Supply support for SM6T18CAHE3/52 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 and automotive qualification.
The SM6T Series is designed specifically for surface-mount transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SM6T18CAHE3/52 under a 10/1000 μs surge?
The SM6T18CAHE3/52 has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 24 A. This value is measured per Figure 1 and Table on page 2 of Vishay document 88385 and reflects worst-case clamping performance across temperature and process variation. The SM6T18CAHE3/52 maintains this clamping level symmetrically in both directions due to its bidirectional CA construction.
Is the SM6T18CAHE3/52 qualified for automotive applications?
Yes, the SM6T18CAHE3/52 is AEC-Q101 qualified, as confirmed by its HE3 suffix and explicit note in the Vishay SM6T datasheet (Rev. 09-Jan-2024, p.1). It undergoes stress testing including high-temperature reverse bias (HTGB), high-temperature operating life (HTOL), and temperature cycling (TCT) per AEC-Q101 Rev. E. The SM6T18CAHE3/52 is approved for use in engine control units, body electronics, and ADAS sensor modules.
What is the standoff voltage (VWM) and how does it relate to circuit design?
The SM6T18CAHE3/52 has a standoff voltage (VWM) of 18 V, meaning it remains non-conductive with leakage <1 μA up to this reverse voltage. Designers must ensure normal operating voltage (e.g., 12 V automotive battery rail) stays ≥15% below VWM to avoid premature conduction. The SM6T18CAHE3/52's 18 V VWM provides safe margin for 13.5–14.5 V nominal systems while enabling effective clamping at 25.2 V.
Does the SM6T18CAHE3/52 have polarity markings on the package?
No, the SM6T18CAHE3/52 has no polarity markings because it is a bidirectional device-the CA suffix indicates symmetrical anode/cathode behavior. Unlike unidirectional SM6T parts (e.g., SM6T18A), the SM6T18CAHE3/52 lacks a cathode band and functions identically regardless of orientation. This simplifies layout and eliminates risk of incorrect placement during automated assembly of the SM6T18CAHE3/52.
What is the thermal resistance and how does it affect PCB layout?
The SM6T18CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. To maintain TJ ≤150 °C under 5.0 W steady-state dissipation, designers must provide adequate copper area and consider airflow. The SM6T18CAHE3/52's thermal performance directly impacts reliability during repetitive surge events and requires adherence to the recommended pad layout in Figure 4.
SM6T18CAHE3/52 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:
- Discontinued at Digi-Key
- 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)
SM6T18CAHE3/52 FAQ
1.How can I place an order for SM6T18CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T18CAHE3/52 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 SM6T18CAHE3/52 reliable?
The price and inventory of SM6T18CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T18CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SM6T18CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T18CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T18CAHE3/52?
SM6T18CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T18CAHE3/52 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 SM6T18CAHE3/52?
For technical support, including SM6T18CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T18CAHE3/52 requirements.
6.How does Aetrix verify that SM6T18CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T18CAHE3/52 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 SM6T18CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SM6T18CAHE3/52?
All SM6T18CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T18CAHE3/52, 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 SM6T18CAHE3/52 part is unused and in its original packaging.
Return procedure for SM6T18CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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