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Vishay General Semiconductor - Diodes Division SM15T18A-E3/57T
- Part No.:
- SM15T18A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T18A-E3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,660
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Product details
Overview
SM15T18A-E3/57T from Vishay General Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) in SMC (DO-214AB) package, with 17.1 V minimum breakdown voltage (VBR), 15.3 V standoff voltage (VWM), and 25.2 V clamping voltage (VC) at 59.5 A peak pulse current. It protects MOSFETs and ICs against lightning-induced and inductive-switching transients in automotive power supplies.
For engineers reviewing the SM15T18A-E3/57T datasheet, SM15T18A-E3/57T pinout, SM15T18A-E3/57T application, or SM15T18A-E3/57T equivalent, key selection criteria include unidirectional polarity, 1500 W 10/1000 μs pulse rating, 15.3 V working voltage, thermal resistance of 75 °C/W, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuitry, triggering conduction when reverse voltage exceeds VBR = 17.1–18.9 V to limit transient energy. Its low-inductance SMC package and glass-passivated junction ensure fast response (<1 ns) and stable clamping under repetitive surge stress.
Designed for high-impedance source environments, it sustains 200 A non-repetitive forward surge (10 ms half-sine) and derates linearly above 25 °C ambient per JESD22-A104, with maximum junction temperature of +150 °C and failure mode specified as short-circuit under overstress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets upper limit for normal circuit bias. |
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system operating voltage. |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 μs) - Clamped voltage during worst-case surge; defines maximum stress on protected downstream components. |
| PPPM | 1500 W - Peak pulse power handling capability; validates suitability for lightning and motor-switching transient protection per IEC 61000-4-5. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; determines safe power dissipation without heatsink. |
| TJ max | +150 °C - Absolute maximum junction temperature; enables operation in under-hood automotive environments. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant (E3 suffix), MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VAK > VBR. |
| Anode | Reference/ground return path | Typically tied to system ground; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validates robustness against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in industrial and automotive systems. |
| Glass passivated chip junction | Ensures stable VBR and low leakage (<1 μA at VWM) across temperature and lifetime. |
| Low inductance SMC package | Minimizes voltage overshoot during fast-rising transients (e.g., <100 ns edges), critical for protecting high-speed logic. |
| AEC-Q101 qualification option | Enables use in automotive powertrain and body electronics where reliability validation is mandatory. |
Applications
| Automotive Power Supply Protection | Industrial Motor Drive I/O Lines |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and chassis ground. Use Value: Limits voltage to ≤25.2 V during 59.5 A surges, preventing damage to 3.3 V/5 V microcontrollers and CAN transceivers. | Use Scenario: Shielding PLC analog input modules from switching noise generated by contactors and solenoids. IC Role / Device Role / Timing Role: Standoff protector on signal lines entering isolated ADC front-ends. Use Value: Maintains 15.3 V operating margin while clamping 10/1000 μs transients to 25.2 V, preserving measurement accuracy. |
| 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 overvoltage clamp on secondary-side DC bus prior to DC-DC converters. Use Value: Absorbs 1500 W pulses without degradation, ensuring uninterrupted operation during lightning-induced line surges. | Use Scenario: Securing microcontroller reset and communication lines in washing machine main control boards. IC Role / Device Role / Timing Role: Localized transient suppressor on 5 V supply to MCU and display driver ICs. Use Value: Prevents latch-up and brownout resets caused by relay coil flyback spikes up to 200 A peak. |
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, same VWM/VBR, SMA package (higher RθJA = 110 °C/W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 compliance. | Select when cost sensitivity outweighs surge robustness and board space allows larger thermal pad. |
| SMCJ18A | Identical PPPM = 1500 W, same VWM/VBR, identical SMC package and pinout | Same clamping performance and footprint; differs only in JEDEC registration and minor test condition tolerances. | Drop-in alternative if dual-sourcing is required; verify manufacturer-specific qualification status for automotive use. |
Compared with SMAJ18A and SMCJ18A, SM15T18A-E3/57T delivers identical surge immunity in the same SMC footprint as SMCJ18A but offers higher reliability margin than SMAJ18A due to its 2.5× peak power rating and lower thermal resistance-critical for sustained industrial operation.
Availability
SM15T18A-E3/57T is available at Aetrix Electronics and suitable for automotive power supply protection, industrial motor drive I/O lines, and telecom DC power feeds requiring stable component supply and long-term lifecycle support.
Supply support for SM15T18A-E3/57T 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SM15T Series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where 1500 W surge immunity and AEC-Q101 qualification readiness are essential.
FAQ
What is the clamping voltage of SM15T18A-E3/57T at its rated peak pulse current?
The SM15T18A-E3/57T 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 per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T18A-E3/57T maintains this clamping performance across its full operating temperature range.
Is SM15T18A-E3/57T suitable for automotive applications?
SM15T18A-E3/57T itself is commercial-grade (E3 suffix), but the SM15T18AHE3 variant is AEC-Q101 qualified for automotive use. Engineers must select the HE3 or HM3 suffix version for under-hood or safety-critical applications. The SM15T18A-E3/57T shares identical electrical characteristics and SMC package with qualified versions, enabling design reuse with qualification upgrade.
What does the "-E3/57T" suffix indicate in SM15T18A-E3/57T?
The "-E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability standards. The "/57T" specifies packaging: 7-inch diameter plastic tape and reel containing 850 units. This format supports automated SMT placement and is traceable per Vishay's material categorization protocol documented in www.vishay.com/doc?99912.
How does SM15T18A-E3/57T compare to bidirectional TVS diodes like SM15T18CA?
SM15T18A-E3/57T is unidirectional and features a cathode band; SM15T18CA is bidirectional with no polarity marking and symmetric clamping in both directions. Both share identical VWM, VBR, and PPPM, but SM15T18A-E3/57T is used where DC bias exists (e.g., power rails), while SM15T18CA suits AC-coupled or floating signal lines. Their SMC footprints are identical.
What is the thermal resistance and maximum power dissipation of SM15T18A-E3/57T?
SM15T18A-E3/57T 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 JEDEC standards. Its steady-state power dissipation (PD) is 6.5 W at TA = 50 °C. Derating begins above 25 °C ambient, reaching zero allowable power at +150 °C junction temperature.
SM15T18A-E3/57T 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-E3/57T FAQ
1.How can I place an order for SM15T18A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T18A-E3/57T 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-E3/57T reliable?
The price and inventory of SM15T18A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T18A-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T18A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T18A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T18A-E3/57T?
SM15T18A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T18A-E3/57T 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-E3/57T?
For technical support, including SM15T18A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T18A-E3/57T requirements.
6.How does Aetrix verify that SM15T18A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T18A-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T18A-E3/57T?
All SM15T18A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T18A-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SM15T18A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T18A-E3/57T Tags
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