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Vishay General Semiconductor - Diodes Division SM15T68A-E3/9AT
- Part No.:
- SM15T68A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T68A-E3/9AT.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,379
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Product details
Overview
SM15T68A-E3/9AT 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 68 V breakdown voltage (VBR = 64.6–71.4 V), 58.1 V stand-off voltage (VWM), 92.0 V clamping voltage at 16.3 A peak pulse current (IPPM), and 1500 W peak pulse power rating with 10/1000 μs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SM15T68A-E3/9AT datasheet, SM15T68A-E3/9AT pinout, SM15T68A-E3/9AT application, or SM15T68A-E3/9AT equivalent, key selection criteria include verified clamping performance under lightning-induced transients, unidirectional polarity with cathode band marking, RoHS-compliant commercial-grade construction, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, triggering when reverse voltage exceeds its 64.6–71.4 V breakdown range and clamping transients to ≤92.0 V at 16.3 A (10/1000 μs). Its glass-passivated junction ensures stable leakage (<1.0 μA at 58.1 V) and low inductance for fast response to sub-microsecond surges.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Fig. 2; thermal resistance is 75 °C/W junction-to-ambient (on recommended pad layout) and 15 °C/W junction-to-lead, enabling reliable operation without forced cooling in typical board-level deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - defines precise conduction onset window for repeatable overvoltage protection |
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 92.0 V @ 16.3 A (10/1000 μs) - actual clamped voltage limiting stress on downstream components |
| PPPM | 1500 W - peak surge energy absorption capacity compliant with IEC 61000-4-5 Level 4 |
| TJ max | +150 °C - enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| Polarity | Unidirectional - cathode marked by band; blocks forward current, clamps reverse transients |
Pinout & Package
SM15T68A-E3/9AT uses the SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, and MSL level 1 moisture sensitivity. Cathode is identified by a visible band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to protected line's lower-potential side (e.g., ground or return rail) |
| Cathode | Reverse surge conduction terminal | Marked with band; connected to line under protection (e.g., 48 V bus or sensor input) |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands 10/1000 μs lightning surges up to 16.3 A without degradation, per IEC 61000-4-5 |
| Glass passivated junction | Ensures stable VBR tolerance (±5%), low leakage (<1 μA), and long-term reliability under thermal cycling |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or inductive kickback) |
| RoHS-compliant, commercial grade | E3 suffix confirms lead-free, halogen-free compliance per JEDEC J-STD-020 and JESD 22-B102 |
| Automated placement compatible | Standard SMC footprint supports high-speed pick-and-place with no special tooling or orientation constraints |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protection of 48 V battery-fed ECUs against load dump and alternator surge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Clamps transients to ≤92.0 V, preventing damage to 65 V-rated input stages while surviving 1500 W pulses. | Use Scenario: Guarding PLC analog input modules against switching transients from solenoid valves and contactors. IC Role / Device Role / Timing Role: Shunt suppressor on 24 V sensor supply line upstream of precision ADC front-end. Use Value: Limits induced voltage spikes to safe levels within 1 ns response time, preserving signal integrity and measurement accuracy. |
| Telecom DC Power Feeds | Consumer Appliance Control Boards |
Use Scenario: Surge protection on -48 V telecom rectifier outputs feeding base station radios. IC Role / Device Role / Timing Role: Primary overvoltage clamp on centralized power distribution bus. Use Value: Absorbs 1500 W surges without failure, maintaining system uptime and meeting GR-1089-CORE immunity requirements. | Use Scenario: Safeguarding microcontroller I/O pins and relay drivers in smart HVAC control units. IC Role / Device Role / Timing Role: Localized TVS on 12 V logic supply and motor driver enable lines. Use Value: Prevents latch-up and gate oxide damage in MOSFET drivers during inductive turn-off events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | Lower PPPM (600 W), same VWM/VBR range, SMB package (smaller footprint, higher RθJA) | Suitable only for <600 W threats; not recommended for lightning-level IEC 61000-4-5 testing | Select SM15T68A-E3/9AT when 1500 W surge margin is required and board space allows SMC outline. |
| 1.5KE68A | Through-hole DO-201 package, identical electrical specs but incompatible with SMT assembly | Requires wave soldering or hand assembly; unsuitable for high-density automated production | Choose SM15T68A-E3/9AT for SMT-only lines, reflow compatibility, and lower profile mounting. |
Compared with SMBJ64A and 1.5KE68A, SM15T68A-E3/9AT delivers triple the pulse power handling in an SMT-optimized package, enabling robust protection in space-constrained automotive and industrial PCBs without sacrificing manufacturability or thermal performance.
Availability
SM15T68A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive inputs, and telecom DC power feeds requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM15T68A-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, power efficiency, and AEC-Q qualification.
The SM15T Series is engineered for high-energy 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-E3/9AT at its rated peak pulse current?
The SM15T68A-E3/9AT has a maximum clamping voltage (VC) of 92.0 V when subjected to its specified peak pulse current of 16.3 A with a 10/1000 μs waveform. This value is measured under standardized test conditions per Fig. 1 and guarantees predictable voltage limiting during surge events. The SM15T68A-E3/9AT maintains this clamping performance across its operational temperature range and after repeated transient exposures, provided derating guidelines are followed.
Is SM15T68A-E3/9AT RoHS-compliant and halogen-free?
Yes, SM15T68A-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and meets commercial-grade environmental specifications. Per Vishay documentation, E3 parts are lead-free and halogen-free, conforming to JEDEC J-STD-020 and JESD 22-B102 standards. The SM15T68A-E3/9AT does not contain brominated flame retardants or chlorine-based compounds, and its molding compound satisfies UL 94 V-0 flammability requirements.
Does SM15T68A-E3/9AT have AEC-Q101 qualification?
No, SM15T68A-E3/9AT is not AEC-Q101 qualified. The "E3" suffix denotes RoHS-compliant commercial grade only. For automotive-qualified versions, Vishay specifies part numbers with "HE3" or "HM3" suffixes (e.g., SM15T68AHE3_A/I). The SM15T68A-E3/9AT is intended for industrial, telecom, and consumer applications where AEC-Q101 certification is not mandated.
What is the thermal resistance of SM15T68A-E3/9AT, and how does it affect PCB layout?
The SM15T68A-E3/9AT 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 terminal, as defined in the datasheet. This value assumes minimum recommended pad layout - reducing pad area increases thermal resistance and risks exceeding 150 °C junction temperature under sustained power dissipation. The SM15T68A-E3/9AT requires adherence to Vishay's mounting recommendations to ensure reliable operation at full 6.5 W steady-state power.
How does the unidirectional configuration of SM15T68A-E3/9AT impact circuit integration?
The unidirectional configuration of SM15T68A-E3/9AT means it conducts only in reverse bias, with the cathode (marked by a band) connected to the line being protected and the anode tied to ground or lower potential. This allows precise DC blocking of forward current while providing low-impedance shunt paths for negative-going transients. Unlike bidirectional variants (e.g., SM15T68CA), the SM15T68A-E3/9AT must be oriented correctly during placement to avoid functional failure or short-circuit risk.
SM15T68A-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):
- 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-E3/9AT FAQ
1.How can I place an order for SM15T68A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T68A-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 SM15T68A-E3/9AT reliable?
The price and inventory of SM15T68A-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 SM15T68A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T68A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T68A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T68A-E3/9AT?
SM15T68A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T68A-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 SM15T68A-E3/9AT?
For technical support, including SM15T68A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T68A-E3/9AT requirements.
6.How does Aetrix verify that SM15T68A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T68A-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 SM15T68A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T68A-E3/9AT?
All SM15T68A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T68A-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 SM15T68A-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T68A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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