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Vishay General Semiconductor - Diodes Division SM15T68A-E3/57T
- Part No.:
- SM15T68A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T68A-E3/57T.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,340
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Product details
Overview
SM15T68A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 68 V breakdown voltage (VBR = 64.6–71.4 V at 1 mA), 58.1 V stand-off voltage (VWM), and 92 V clamping voltage (VC) at 16.3 A peak pulse current (IPPM). It delivers 1500 W peak pulse power (10/1000 μs), operates from −65 °C to +150 °C, and protects MOSFETs and signal lines in automotive power supply rails.
For engineers reviewing the SM15T68A-E3/57T datasheet, SM15T68A-E3/57T pinout, SM15T68A-E3/57T application, or SM15T68A-E3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs transients, unidirectional polarity marking, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SM15T68A-E3/57T uses a glass-passivated silicon junction optimized for high-energy transient suppression. Its unidirectional configuration features a cathode band marking and exhibits low dynamic impedance during clamping, enabling fast response to lightning-induced surges and inductive switching spikes.
Designed for systems with high source impedance-such as automotive ECUs and industrial I/O modules-it limits peak current within its rated IPPM of 16.3 A (10/1000 μs) and fails short-circuit under overstress. Thermal performance is validated per J-STD-020 MSL level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise breakdown threshold for reliable overvoltage triggering |
| VWM | 58.1 V - maximum continuous reverse voltage before leakage exceeds 1 μA, sets operating margin below VBR |
| VC @ IPPM | 92 V at 16.3 A (10/1000 μs) - clamping voltage seen by protected circuit during worst-case surge |
| PPPM | 1500 W - peak transient energy absorption capability without degradation under standardized waveform |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance determines derating above 25 °C ambient |
| TJ max. | +150 °C - maximum junction temperature defining safe continuous operation and surge survivability |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" body length and cathode band polarity indicator |
Pinout & Package
SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, compliant with J-STD-002 solderability and JESD 22-B102. Cathode marked by single band; anode is unmarked end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VAK > VBR |
| Anode (unmarked end) | Reference node | Typically tied to system ground or low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against lightning surges and motor-switching transients without derating in typical PCB layouts |
| Glass-passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low inductance construction | Minimizes voltage overshoot during fast-rising transients (<10 ns rise time), improving clamping fidelity |
| MSL level 1 (260 °C peak) | Supports standard lead-free reflow profiles without popcorn cracking or delamination |
| RoHS-compliant, halogen-free option available | Meets global environmental compliance requirements for automotive and industrial end equipment |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECU power input subjected to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients above 58.1 V. Use Value: Limits voltage seen by downstream DC/DC converters to ≤92 V during 16.3 A surges, preventing damage to 36 V-rated input stages. |
Use Scenario: Digital I/O lines connecting PLC controller to solenoid valves with inductive kickback. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt switching spikes before entering logic-level drivers. Use Value: Clamps 10/1000 μs transients to 92 V while maintaining <1 μA leakage at 58.1 V, preserving signal integrity during normal operation. |
| Telecom Line Interface Protection | Consumer Appliance Power Supply Input |
|
Use Scenario: AC-DC adapter primary-side rectifier output exposed to surge events per IEC 61000-4-5. IC Role / Device Role / Timing Role: Unidirectional suppressor across bulk capacitor to absorb line-to-ground surges. Use Value: Absorbs 1500 W peak energy without failure, with thermal resistance (75 °C/W) allowing stable operation at 50 °C ambient. |
Use Scenario: Secondary-side 5 V rail in smart home hub powering USB peripherals and sensors. IC Role / Device Role / Timing Role: TVS placed after DC/DC regulator output to protect sensitive SoC inputs from board-level coupling. Use Value: Provides 92 V clamping at 16.3 A with <1 μA leakage at 58.1 V, ensuring no standby current penalty or false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A (Bourns) | Lower PPPM (600 W), same VWM/VBR range, SMB package (smaller footprint, higher RθJA) | Limited to lower-energy threats; unsuitable for lightning-level surges requiring 1500 W | Select only if system threat level is <600 W and board space is constrained |
| 1.5KE68A (Littelfuse) | Through-hole DO-201 package, identical VBR/VC, but higher RθJA (~100 °C/W) and no MSL-1 rating | Requires wave soldering; not compatible with automated SMT assembly or high-reliability reflow processes | Choose only for legacy through-hole designs where SMT is unavailable |
Compared with SMBJ64A and 1.5KE68A, the SM15T68A-E3/57T uniquely combines 1500 W surge capacity, SMC surface-mount compatibility, MSL level 1 reflow readiness, and 75 °C/W thermal resistance-making it optimal for automotive and industrial SMT production where high-energy transient immunity and process scalability are required.
Availability
SM15T68A-E3/57T is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial motor drive I/O interfaces, and telecom line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM15T68A-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, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The SM15T Series was engineered specifically for high-power transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are critical design requirements.
FAQ
What is the clamping voltage of SM15T68A-E3/57T at its rated peak pulse current?
The SM15T68A-E3/57T has a maximum clamping voltage (VC) of 92 V at 16.3 A peak pulse current (IPPM) 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 and represents the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is SM15T68A-E3/57T suitable for automotive applications?
Yes, SM15T68A-E3/57T is RoHS-compliant and qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes. While the -E3/57T variant is commercial-grade, its construction-including glass-passivated junction, MSL level 1 rating, and −65 °C to +150 °C operating range-supports deployment in automotive power and signal lines where qualification is customer-validated.
What does the "E3/57T" suffix indicate in SM15T68A-E3/57T?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "57T" specifies packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units. This ordering code ensures compatibility with high-speed pick-and-place equipment and meets J-STD-002 solderability standards.
How does SM15T68A-E3/57T differ from bidirectional TVS diodes like SM15T68CA?
SM15T68A-E3/57T is unidirectional with cathode band marking and conducts only in reverse bias above VBR; SM15T68CA is bidirectional, symmetrical in both polarities, and lacks polarity marking. The unidirectional version offers lower leakage at VWM and is preferred for DC rail protection, whereas the CA variant suits AC or floating signal lines.
What is the thermal resistance of SM15T68A-E3/57T, and how does it affect layout?
The SM15T68A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" copper pads. To maintain safe junction temperatures during repeated surges, PCB layout must adhere to this pad size-reducing copper area increases RθJA, risking thermal runaway during high-duty-cycle transients.
SM15T68A-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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 16.3A
- 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)
SM15T68A-E3/57T FAQ
1.How can I place an order for SM15T68A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T68A-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 SM15T68A-E3/57T reliable?
The price and inventory of SM15T68A-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 SM15T68A-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T68A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T68A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T68A-E3/57T?
SM15T68A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T68A-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 SM15T68A-E3/57T?
For technical support, including SM15T68A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T68A-E3/57T requirements.
6.How does Aetrix verify that SM15T68A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T68A-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 SM15T68A-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T68A-E3/57T?
All SM15T68A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T68A-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 SM15T68A-E3/57T part is unused and in its original packaging.
Return procedure for SM15T68A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T68A-E3/57T Tags
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