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Vishay General Semiconductor - Diodes Division SM15T18A-M3/57T
- Part No.:
- SM15T18A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18A-M3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,242
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Product details
Overview
SM15T18A-M3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1.0 mA), 25.2 V clamping voltage (VC) at 59.5 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 μs). It is widely used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SM15T18A-M3/57T datasheet, SM15T18A-M3/57T pinout, SM15T18A-M3/57T application, or SM15T18A-M3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs transients, unidirectional polarity with cathode band marking, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SM15T18A-M3/57T operates as a silicon avalanche diode that enters controlled breakdown above its VWM of 15.3 V, limiting transient voltages to ≤25.2 V at 59.5 A. Its low-inductance SMC package and glass-passivated junction support fast response (<1 ns) and stable clamping across -65 °C to +150 °C junction temperature range.
It is rated for 1500 W peak pulse power per 10/1000 μs waveform, derated linearly above 25 °C ambient, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. Failure mode under overstress is short-circuit, consistent with IEC 61000-4-5 surge immunity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - Ensures reliable turn-on margin above VWM with tight tolerance |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Limits protected circuit voltage during lightning or inductive switching surges |
| PPPM | 1500 W - Supports high-energy threats like IEC 61000-4-5 Level 4 (4 kV line-to-earth) |
| IFSM | 200 A (10 ms half-sine) - Withstands repetitive motor-switching surges without degradation |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 0.305" × 0.320" footprint and matte tin leads |
Pinout & Package
SM15T18A-M3/57T is housed in an SMC (DO-214AB) plastic package with two terminals: anode and cathode. The cathode is marked by a visible band on the body. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VWM exceeded |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges per IEC 61000-4-5 without external series impedance |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage stress on downstream MOSFETs or logic ICs during transient events |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance mandates without compromising surge rating |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling |
| Low junction-to-lead thermal resistance (15 °C/W) | Improves power handling during repetitive surge events by enabling efficient heat transfer to PCB |
Applications
| Automotive Power Supply Protection | Industrial Motor Drive I/O Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator surge transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going spikes up to 1500 W. Use Value: Clamps to 25.2 V within nanoseconds, preventing damage to 3.3 V/5 V microcontrollers and CAN transceivers downstream of DC/DC converters. |
Use Scenario: Shielding PLC analog input modules from inductive kickback generated by solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V sensor supply line, absorbing 59.5 A pulses without degradation. Use Value: Maintains signal integrity by limiting transient overshoot below ADC input absolute maximum ratings while surviving >100,000 surge cycles. |
| Telecom DC Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Safeguarding PoE-powered Ethernet switches against induced surges on 48 V DC input rails. IC Role / Device Role / Timing Role: Primary surge suppression stage before DC/DC regulation, rated for repeated 10/1000 μs threats. Use Value: Delivers 1500 W clamping capability in compact SMC package, eliminating need for bulkier MOV-based solutions. |
Use Scenario: Protecting microcontroller GPIOs and relay drivers on washing machine main control boards exposed to motor commutation noise. IC Role / Device Role / Timing Role: Localized TVS on 5 V/12 V internal rails, mounted directly at connector entry points. Use Value: Prevents latch-up and gate oxide rupture in logic-level MOSFETs during ESD and switching transients with <1 ns response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Lower peak power (400 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA) | Suitable only for lower-energy threats (e.g., ESD, low-current switching); not rated for IEC 61000-4-5 Level 4 | Select SM15T18A-M3/57T when 1500 W surge handling and automotive-grade reliability are required. |
| SMCJ18A-M3/57T | Identical electrical specs and SMC package, but M3 suffix denotes halogen-free RoHS compliance (same as SM15T18A-M3/57T) | No functional difference; SMCJ18A-M3/57T is legacy naming-SM15T18A-M3/57T supersedes it with updated qualification and documentation | SM15T18A-M3/57T is the current production part; SMCJ18A-M3/57T may be available in limited legacy stock but lacks latest AEC-Q101 alignment. |
Compared with SMAJ18A-E3/57T, SM15T18A-M3/57T delivers 3.75× higher surge power handling and superior thermal performance; versus SMCJ18A-M3/57T, it offers identical protection with updated manufacturing traceability and halogen-free compliance verification.
Availability
SM15T18A-M3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, and telecom power systems requiring stable component supply with full halogen-free and RoHS compliance.
Supply support for SM15T18A-M3/57T 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 reliability, efficiency, and application-specific qualification.
The SM15T Series was developed for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SM15T18A-M3/57T at its rated peak pulse current?
The SM15T18A-M3/57T has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current of 59.5 A under the standard 10/1000 μs waveform. This value is measured with the device mounted on 0.31" × 0.31" copper pads and ensures predictable overvoltage limiting for downstream components such as microcontrollers and power MOSFETs in the SM15T18A-M3/57T-protected circuit.
Is SM15T18A-M3/57T suitable for automotive applications?
Yes, SM15T18A-M3/57T is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; the M3 suffix indicates halogen-free RoHS compliance and commercial-grade qualification. While SM15T18A-M3/57T itself is commercial grade, its construction-glass-passivated junction, 150 °C TJ max, and MSL Level 1 reflow rating-supports under-hood deployment when validated per system-level requirements. For certified automotive use, specify SM15T18AHM3_X.
How does the M3 suffix affect SM15T18A-M3/57T's compliance and performance?
The M3 suffix on SM15T18A-M3/57T designates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards. It does not alter electrical performance-VWM, VBR, VC, and PPPM remain identical to E3-suffix variants-but ensures compliance with EU ELV and other environmental directives critical for export-oriented industrial and consumer designs using SM15T18A-M3/57T.
What is the thermal resistance of SM15T18A-M3/57T, and how does it impact layout?
SM15T18A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. To achieve rated 1500 W pulse power, the PCB must provide 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad area increases RθJA, derating both peak and steady-state power handling-so layout adherence is essential for SM15T18A-M3/57T to meet datasheet specifications.
Can SM15T18A-M3/57T replace older SMCJ18A parts in existing designs?
Yes, SM15T18A-M3/57T is a direct form-fit-function replacement for SMCJ18A-M3/57T, sharing identical electrical characteristics, SMC package dimensions, pinout, and thermal behavior. The SM15T designation reflects Vishay's updated product family structure with enhanced documentation and qualification tracking, making SM15T18A-M3/57T fully backward-compatible while offering improved supply chain transparency and compliance reporting.
SM15T18A-M3/57T 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-M3/57T FAQ
1.How can I place an order for SM15T18A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18A-M3/57T 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-M3/57T reliable?
The price and inventory of SM15T18A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18A-M3/57T is usually 5 days.
3.What payment methods are accepted for SM15T18A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18A-M3/57T?
SM15T18A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18A-M3/57T 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-M3/57T?
For technical support, including SM15T18A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18A-M3/57T requirements.
6.How does Aetrix verify that SM15T18A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T18A-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SM15T18A-M3/57T?
All SM15T18A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18A-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SM15T18A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18A-M3/57T Tags
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