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Vishay General Semiconductor - Diodes Division SM15T18CAHE3/9AT
- Part No.:
- SM15T18CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CAHE3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,931
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Product details
Overview
SM15T18CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 18 V standoff voltage (VWM), and clamping voltage of 25.2 V at 59.5 A peak pulse current. It provides robust protection for automotive-grade sensor signal lines and I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18CAHE3/9AT datasheet, SM15T18CAHE3/9AT pinout, SM15T18CAHE3/9AT application, or SM15T18CAHE3/9AT equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge rating, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SM15T18CAHE3/9AT employs a glass-passivated silicon junction optimized for low-inductance transient suppression in bidirectional configurations. Its breakdown voltage (VBR) is 17.1–18.9 V at 1 mA test current, with clamping voltage capped at 25.2 V under 10/1000 μs 59.5 A pulse - enabling reliable overvoltage limiting without device latch-up.
Designed for high-reliability automotive applications, it meets AEC-Q101 qualification and J-STD-020 MSL Level 1 (peak reflow 260 °C). Thermal performance is characterized by RθJL = 15 °C/W and maximum junction temperature of +150 °C, supporting operation in engine bay and ADAS sensor modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Ensures predictable turn-on threshold across production lot; critical for timing-critical protection windows. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamping voltage limits downstream IC stress to <25.2 V during worst-case surge events. |
| PPPM | 1500 W - Peak pulse power handling capability per IEC 61000-4-5 waveform; supports Class 3B lightning immunity compliance. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without derating below full power. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on 8 mm × 8 mm copper pads; informs board-level thermal design requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Accepts reverse surge current during negative voltage excursions; symmetric with cathode for bidirectional clamping. |
| Cathode | Transient current entry (positive half-cycle) | Accepts forward surge current during positive voltage excursions; identical electrical role to anode in CA-series devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, LIN, sensor bridges) without external polarity management. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock - required for front-end electronics in OEM designs. |
| Low clamping ratio (VC/VWM = 1.4) | Minimizes overvoltage margin between protection threshold and clamping level - reduces risk of downstream IC damage during fast transients. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing flow for high-volume automotive PCB assembly. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units and ADAS modules from load-dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to limit transients before reaching precision ADC or op-amp input stages. Use Value: Prevents sensor signal corruption and ADC saturation during 100 V/μs transients, maintaining measurement integrity across -40 °C to +125 °C operating range. |
Use Scenario: Safeguarding RS-485/RS-422 differential data lines in PLC backplanes and motor drive controllers exposed to EFT and surge events. IC Role / Device Role / Timing Role: Fast-response TVS shunting common-mode surges between A/B lines and ground, preserving signal integrity up to 20 Mbps. Use Value: Maintains bus uptime by clamping 4 kV ESD (IEC 61000-4-2) and 2 kV surge (IEC 61000-4-5) without latch-up or parameter shift after repeated events. |
| Telecom Power Input | Consumer USB Port Protection |
Use Scenario: Guarding 12 V/24 V DC power inputs of base station remote radio units and fiber access terminals against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge arrestor in series with upstream fuse and downstream DC-DC converter, absorbing >95% of 1500 W transient energy. Use Value: Achieves system-level IEC 61000-4-5 Level 4 compliance (4 kV line-to-ground) with single-stage protection and no secondary crowbar needed. |
Use Scenario: Securing VBUS and D+/D- lines of USB 2.0 ports in smart home hubs and set-top boxes against ESD and hot-plug transients. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) bidirectional clamp placed adjacent to USB connector to minimize signal distortion. Use Value: Limits ESD clamping voltage to <25.2 V while maintaining <0.5 dB insertion loss at 480 MHz - preserves USB 2.0 eye diagram integrity. |
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 | Lower peak power (400 W), same VWM/VC, SMA package (smaller thermal mass) | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use | Select when cost-sensitive, lower-energy threat profiles apply and automotive qualification is unnecessary. |
| 1.5KE18CA | Higher VC (29.2 V), through-hole DO-204AC package, same 1500 W rating | Lacks MSL Level 1 and AEC-Q101; unsuitable for automated SMT or under-hood environments | Choose only for legacy through-hole designs where board space permits and reflow compatibility is not required. |
Compared with SMAJ18CA and 1.5KE18CA, the SM15T18CAHE3/9AT delivers higher reliability in automotive systems via AEC-Q101 validation, superior thermal dissipation in SMC package, and tighter clamping ratio - making it the preferred choice for new SMT-based designs requiring long-term field robustness.
Availability
SM15T18CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and telecom power input circuits requiring stable component supply, AEC-Q101 compliance, and 1500 W surge immunity.
Supply support for SM15T18CAHE3/9AT 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, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified components.
The SM15T Series was engineered specifically for demanding transient suppression in automotive and industrial environments, combining high peak power, low clamping voltage, and AEC-Q101 qualification in compact SMC packaging.
FAQ
What is the clamping voltage of the SM15T18CAHE3/9AT under a 10/1000 μs surge?
The SM15T18CAHE3/9AT clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 59.5 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and ensures downstream circuitry remains within safe operating voltage limits during surge events.
Is the SM15T18CAHE3/9AT suitable for automotive applications?
Yes, the SM15T18CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HE3". It undergoes rigorous stress testing including temperature cycling, humidity bias, and mechanical shock - making it appropriate for engine control, ADAS, and body electronics where reliability is mission-critical.
What does the "CA" suffix indicate in SM15T18CAHE3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning the SM15T18CAHE3/9AT provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM15T18A), it has no polarity marking and functions identically in either orientation on the PCB.
What is the thermal resistance of the SM15T18CAHE3/9AT?
The SM15T18CAHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. Its junction-to-lead resistance (RθJL) is 15 °C/W, supporting efficient heat transfer to PCB copper in high-power transient scenarios.
Does the SM15T18CAHE3/9AT require special handling during reflow soldering?
No - the SM15T18CAHE3/9AT is rated MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. It can be processed using standard lead-free reflow profiles without baking or dry-pack requirements, streamlining SMT assembly for high-volume production.
SM15T18CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, 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):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SM15T18CAHE3/9AT FAQ
1.How can I place an order for SM15T18CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CAHE3/9AT 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 SM15T18CAHE3/9AT reliable?
The price and inventory of SM15T18CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T18CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CAHE3/9AT?
SM15T18CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CAHE3/9AT 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 SM15T18CAHE3/9AT?
For technical support, including SM15T18CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CAHE3/9AT requirements.
6.How does Aetrix verify that SM15T18CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T18CAHE3/9AT 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 SM15T18CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T18CAHE3/9AT?
All SM15T18CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CAHE3/9AT, 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 SM15T18CAHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T18CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CAHE3/9AT Tags
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