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Vishay General Semiconductor - Diodes Division SM15T18A-E3/9AT
- Part No.:
- SM15T18A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18A-E3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
SM15T18A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR), and 1500 W peak pulse power (10/1000 μs). It clamps transients to ≤25.2 V at 59.5 A IPPM and is used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SM15T18A-E3/9AT datasheet, SM15T18A-E3/9AT pinout, SM15T18A-E3/9AT application, or SM15T18A-E3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge rating, 25.2 V clamping voltage at 59.5 A, RoHS-compliant E3 termination, and SMC package compatibility with automated placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped overvoltage protection device, triggered when reverse voltage exceeds its 17.1–18.9 V breakdown threshold. Its low-inductance SMC package and glass-passivated junction enable fast response (<1 ns) to transient events such as inductive switching surges and lightning-induced line transients.
The device exhibits a maximum clamping voltage of 25.2 V at 59.5 A (10/1000 μs), with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. It sustains 200 A non-repetitive forward surge current (10 ms half-sine) and operates across –65 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1.0 mA - Confirmed avalanche onset range under DC test conditions |
| VC (Clamping Voltage) | 25.2 V at IPPM = 59.5 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge |
| PPPM (Peak Pulse Power) | 1500 W - Surge energy handling capability per IEC 61000-4-5 standard waveform |
| IFSM (Surge Current) | 200 A - Single half-sine 10 ms forward surge rating for unidirectional operation |
| TJ max. | +150 °C - Maximum junction temperature defining thermal derating envelope |
| Package | SMC (DO-214AB) - Surface-mount outline with 0.320" × 0.246" footprint and matte tin-plated leads |
Pinout & Package
SM15T18A-E3/9AT uses the SMC (DO-214AB) package: a molded plastic case with two gull-wing leads, cathode indicated by a band. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated IPPM performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to system ground or low-side reference in unidirectional TVS configuration |
| Cathode | Current exit point in forward bias; high-impedance node in reverse standby | Banded end; connected to protected line (e.g., 12 V rail or sensor input) to clamp overvoltage to ground |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges and inductive load switching in automotive power nets |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes stress on downstream components by limiting transient overshoot relative to breakdown threshold |
| Glass passivated chip junction | Ensures stable VBR and leakage performance over temperature and long-term reliability in harsh environments |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free SMT assembly without moisture-related popcorning or delamination |
| RoHS-compliant E3 termination | Meets global environmental compliance requirements while maintaining solderability per J-STD-002 and JESD 22-B102 |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 15.3 V. Use Value: Limits voltage to ≤25.2 V during 59.5 A transients, preventing damage to MCU power inputs and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt ESD and cable discharge events to ground. Use Value: Sub-1 ns response and 25.2 V clamping preserve signal integrity and prevent ADC saturation or op-amp latch-up. |
| DC-DC Converter Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Input protection for 24 V input buck converters in telecom power systems. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing line transients before they reach primary-side FETs and controller ICs. Use Value: 1500 W rating handles repeated 10/1000 μs surges without degradation, supporting >10-year field life. |
Use Scenario: Clamping gate-source voltage spikes on high-side N-channel MOSFETs in motor drives. IC Role / Device Role / Timing Role: Low-inductance SMC package minimizes parasitic ringing during fast dV/dt events. Use Value: 25.2 V clamping prevents gate oxide breakdown while maintaining <100 nA leakage at 15.3 V standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | 600 W PPPM, SMA package, same VWM/VBR range but lower surge rating | Limited to lower-energy threats (e.g., ESD, local switching noise); not suitable for lightning-level surges | Select when board space is constrained and threat level is below 1 kV/42 Ω IEC 61000-4-5 |
| SMCJ18A | 1500 W PPPM, identical SMC package, but higher VC = 28.8 V at 52.2 A | Higher clamping voltage reduces margin for 18 V-rated ICs; requires verification of downstream voltage tolerance | Choose if legacy design uses SMCJ series and layout reuse is prioritized over optimal clamping |
Compared with SMAJ18A and SMCJ18A, SM15T18A-E3/9AT delivers superior clamping performance (25.2 V vs. ≥28.8 V) at full 1500 W rating in the same SMC footprint, making it optimal for automotive and industrial designs where voltage margin and surge robustness are critical.
Availability
SM15T18A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input stage protection requiring stable component supply and AEC-Q101-aligned reliability.
Supply support for SM15T18A-E3/9AT 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SM15T Series was developed for high-energy transient suppression in automotive, industrial, and telecom infrastructure, targeting robust 1500 W surge handling in compact SMC packaging with AEC-Q101 qualification path.
FAQ
What is the clamping voltage of SM15T18A-E3/9AT at its rated peak pulse current?
The SM15T18A-E3/9AT has a maximum clamping voltage (VC) of 25.2 V when subjected to its peak pulse current (IPPM) of 59.5 A under the standardized 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, as specified in the Vishay datasheet revision 09-Jan-2024. The SM15T18A-E3/9AT maintains this clamping performance across its operational temperature range.
Is SM15T18A-E3/9AT RoHS-compliant and halogen-free?
Yes, SM15T18A-E3/9AT carries the "E3" suffix, indicating RoHS-compliance per EU Directive 2011/65/EU and exemption 7a. It is not halogen-free; halogen-free versions use the "M3" suffix (e.g., SM15T18A-M3/9AT). The SM15T18A-E3/9AT uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance requirements.
Does SM15T18A-E3/9AT meet AEC-Q101 qualification?
No, SM15T18A-E3/9AT is commercial-grade and not AEC-Q101 qualified. For automotive-qualified variants, Vishay offers SM15T18AHE3_A/I (with HE3 suffix), which includes full AEC-Q101 stress testing and qualification. The SM15T18A-E3/9AT shares identical electrical and thermal characteristics but lacks the extended reliability validation required for automotive under-hood applications.
What is the thermal resistance from junction to ambient for SM15T18A-E3/9AT?
The typical thermal resistance from junction to ambient (RθJA) for SM15T18A-E3/9AT is 75 °C/W, measured under standard JEDEC conditions with 0.31" × 0.31" copper pads. Its junction-to-lead thermal resistance (RθJL) is 15 °C/W. These values define the derating curve shown in Figure 2 of the datasheet and must be applied when operating above TA = 25 °C.
Can SM15T18A-E3/9AT be used in bidirectional configurations?
No, SM15T18A-E3/9AT is unidirectional only, as indicated by the "A" suffix and cathode band marking. For bidirectional operation, Vishay specifies the "CA" suffix (e.g., SM15T18CA). Bidirectional variants have symmetric breakdown in both polarities and no polarity marking; using SM15T18A-E3/9AT in reverse-biased AC applications would result in unintended conduction and failure.
SM15T18A-E3/9AT 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:
- 1
- Bidirectional Channels:
- -
- 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)
SM15T18A-E3/9AT FAQ
1.How can I place an order for SM15T18A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18A-E3/9AT 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 SM15T18A-E3/9AT reliable?
The price and inventory of SM15T18A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T18A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18A-E3/9AT?
SM15T18A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18A-E3/9AT 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 SM15T18A-E3/9AT?
For technical support, including SM15T18A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18A-E3/9AT requirements.
6.How does Aetrix verify that SM15T18A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T18A-E3/9AT 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 SM15T18A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T18A-E3/9AT?
All SM15T18A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18A-E3/9AT, 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 SM15T18A-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T18A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18A-E3/9AT Tags
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