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Vishay General Semiconductor - Diodes Division SM15T18CA-M3/9AT
- Part No.:
- SM15T18CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18CA-M3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
SM15T18CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 18 V standoff voltage (VWM), 25.2 V clamping voltage at 59.5 A IPPM, and operating up to +150 °C junction temperature. It protects signal lines and power rails in automotive sensor interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T18CA-M3/9AT datasheet, SM15T18CA-M3/9AT pinout, SM15T18CA-M3/9AT application, or SM15T18CA-M3/9AT equivalent, key selection criteria include bidirectional clamping behavior, low clamping ratio (VC/VWM = 1.4), halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, with symmetrical breakdown in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable VBR (17.1–18.9 V) and low leakage (<1.0 μA at VWM), while low-inductance SMC package enables fast response to sub-microsecond threats.
Thermal design relies on RθJA = 75 °C/W and RθJL = 15 °C/W, requiring minimum 8.0 mm × 8.0 mm copper pads per terminal for full 1500 W rating. Failure mode under overstress is short-circuit, consistent with IEC 61000-4-5 Level 4 surge immunity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR min/max | 17.1 V / 18.9 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 25.2 V at 59.5 A - Clamping voltage under 10/1000 μs surge; limits downstream IC stress to <2.5× VWM. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 4th-level (4 kV/2 Ω) surge testing. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating below 125 °C ambient. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with standard SMT reflow profiles (MSL level 1, 260 °C peak). |
Pinout & Package
SM15T18CA-M3/9AT uses a 2-terminal SMC (DO-214AB) package with no polarity marking-bidirectional operation eliminates cathode/anode distinction. Terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as input/output path; symmetric conduction enables placement without orientation constraints. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completes low-inductance clamping loop; requires equal PCB trace length to minimize loop inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity concerns. |
| 1500 W peak pulse power | Withstands 4 kV/2 Ω IEC 61000-4-5 surges without degradation when mounted on 8 mm × 8 mm copper pads. |
| Low clamping ratio (VC/VWM = 1.4) | Minimizes overvoltage stress on protected ICs-critical for 3.3 V or 5 V logic interfacing with 12 V supply domains. |
| Halogen-free & RoHS-compliant (M3) | Fulfills automotive and industrial environmental compliance mandates without sacrificing thermal or electrical performance. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs in engine control modules exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamps ±25 V spikes to <±25.2 V, preserving signal integrity during 10/1000 μs surges. Use Value: Prevents latch-up or gate oxide damage in transceivers by limiting peak voltage to 1.4× VWM, enabling robust operation across -40 °C to +125 °C. | Use Scenario: Shielding analog input channels (0–10 V, 4–20 mA) in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Fast-response crowbar shunts >50 A transients away from precision ADC front-ends and op-amp buffers. Use Value: Maintains measurement accuracy by holding clamped voltage below 25.2 V-well below 30 V absolute maximum ratings of common industrial op-amps. |
| Telecom Line Card Protection | Consumer Power Adapter ESD/Surge |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller pins against lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: Bidirectional clamp absorbs differential-mode energy on twisted-pair lines while maintaining signal rise time <1 ns. Use Value: Achieves IEC 61000-4-5 Level 4 compliance (4 kV line-earth) with no additional series impedance, preserving 100BASE-TX signal integrity. | Use Scenario: Adding secondary surge protection on DC output rails of USB-C PD adapters after primary MOV filtering. IC Role / Device Role / Timing Role: Low-leakage (<1 μA) TVS provides final-stage clamping without loading quiescent 5 V/9 V/15 V outputs. Use Value: Extends adapter lifetime by preventing cumulative degradation from repetitive 1 kV EFT bursts-validated per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | 600 W PPPM, SMA package, higher RθJA (110 °C/W), same VWM/VC specs | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive under-hood use | Select when board space is constrained and surge threat level is ≤2 kV. |
| SMCJ18CA | 1500 W PPPM, identical SMC package, but E3 suffix (non-halogen-free) and no AEC-Q101 option | Meets commercial-grade reliability only; not qualified for automotive AEC-Q101 stress tests | Choose for cost-sensitive industrial designs where halogen-free is not mandated. |
Compared with SMAJ18CA and SMCJ18CA, SM15T18CA-M3/9AT uniquely combines 1500 W surge capacity, halogen-free compliance, and AEC-Q101 qualification pathway-making it the only option for next-generation automotive ECUs requiring both high-energy immunity and environmental compliance.
Availability
SM15T18CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interface, industrial PLC I/O protection, and telecom line card applications requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SM15T18CA-M3/9AT 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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SM15T Series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure modes must be controlled and surge immunity must exceed IEC 61000-4-5 Level 4.
FAQ
What is the clamping voltage of SM15T18CA-M3/9AT at its rated peak pulse current?
The SM15T18CA-M3/9AT has a maximum clamping voltage (VC) of 25.2 V at 59.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, ensuring full 1500 W power dissipation capability. The clamping ratio VC/VWM = 1.4 reflects tight voltage control critical for protecting 3.3 V and 5 V logic circuits.
Is SM15T18CA-M3/9AT suitable for automotive applications?
Yes, SM15T18CA-M3/9AT is halogen-free and RoHS-compliant (M3 suffix), and belongs to the AEC-Q101-qualified SM15T family-though the exact M3/9AT variant requires ordering with HM3 suffix (e.g., SM15T18CAHM3_A/I) for formal qualification. Its 1500 W surge rating, -65 °C to +150 °C operating range, and low clamping voltage make it appropriate for automotive sensor and communication interface protection.
How does the bidirectional configuration of SM15T18CA-M3/9AT affect PCB layout?
The bidirectional nature of SM15T18CA-M3/9AT eliminates polarity marking and orientation constraints-either terminal connects to line or ground without functional impact. However, symmetric PCB trace routing is essential: both terminals must have matched length and impedance to preserve balanced clamping response, especially in differential applications like CAN or RS-485.
What is the thermal resistance of SM15T18CA-M3/9AT, and how does it impact heatsinking?
SM15T18CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. Full 1500 W rating requires mounting on minimum 8.0 mm × 8.0 mm copper pads per terminal; reducing pad area increases thermal resistance and necessitates derating per Figure 2 in the datasheet. No external heatsink is needed if PCB copper area meets specification.
Does SM15T18CA-M3/9AT meet industry surge immunity standards?
Yes, SM15T18CA-M3/9AT is designed to meet IEC 61000-4-5 Level 4 (4 kV line-earth, 2 Ω source impedance) when applied with proper PCB layout. Its 1500 W peak pulse power rating, low clamping voltage, and fast response time (<1 ns) enable compliance in automotive, industrial, and telecom equipment-provided the system-level grounding and layout follow Vishay's recommended practices in Application Note AN8001.
SM15T18CA-M3/9AT 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:
- 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):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SM15T18CA-M3/9AT FAQ
1.How can I place an order for SM15T18CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18CA-M3/9AT 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 SM15T18CA-M3/9AT reliable?
The price and inventory of SM15T18CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T18CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18CA-M3/9AT?
SM15T18CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18CA-M3/9AT 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 SM15T18CA-M3/9AT?
For technical support, including SM15T18CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18CA-M3/9AT requirements.
6.How does Aetrix verify that SM15T18CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T18CA-M3/9AT 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 SM15T18CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T18CA-M3/9AT?
All SM15T18CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18CA-M3/9AT, 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 SM15T18CA-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T18CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18CA-M3/9AT Tags
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