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Vishay General Semiconductor - Diodes Division SM15T68CAHE3/9AT
- Part No.:
- SM15T68CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T68CAHE3/9AT.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,991
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Product details
Overview
SM15T68CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 68 V breakdown voltage (VBR = 64.6–71.4 V), and clamping voltage of 92.0 V at 16.3 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T68CAHE3/9AT datasheet, SM15T68CAHE3/9AT pinout, SM15T68CAHE3/9AT application, or SM15T68CAHE3/9AT equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (VC/VBR ≈ 1.36), and compatibility with high-impedance transient sources typical in automotive and industrial control systems.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1 μA at 58.1 V) and robust ESD immunity up to ±30 kV (HBM).
The device is designed for surface-mount placement on PCBs with minimum 8.0 mm × 8.0 mm copper pads per terminal, delivering thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. It meets MSL Level 1 (260 °C peak reflow) and supports automotive-grade reliability via AEC-Q101 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - Ensures reliable conduction onset above 58.1 V stand-off voltage while maintaining margin against false triggering. |
| VC @ IPPM | 92.0 V at 16.3 A (10/1000 μs) - Limits downstream voltage stress during 1.5 kW surges to safe levels for 3.3 V/5 V/12 V ICs. |
| PPPM | 1500 W - Handles lightning-induced transients (IEC 61000-4-5 Level 4) and inductive switch-off spikes without degradation. |
| IPPM | 16.3 A - Matches typical system source impedances (>30 Ω) to avoid exceeding device rating during standardized surge events. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| Package | SMC (DO-214AB) - Standardized footprint compatible with automated SMT assembly and provides mechanical robustness for vibration-prone applications. |
Pinout & Package
SM15T68CAHE3/9AT uses the SMC (DO-214AB) surface-mount package: molded thermoset body, matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking (bidirectional configuration). Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), with cathode/anode terminals identified only by physical orientation on tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (bidirectional) | One side of symmetrical P-N junction; connects to protected line without polarity constraint. |
| Terminal 2 | Cathode (bidirectional) | Other side of symmetrical P-N junction; completes bidirectional clamping path across protected node. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD-HBM/MM, enabling use in ADAS sensors and body control modules. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 combination wave (1.2/50 μs voltage, 8/20 μs current) up to 1.5 kW without failure or parameter shift. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage exposure to downstream components-critical for protecting low-voltage microcontrollers and CAN transceivers. |
| MSL Level 1 (260 °C) | Supports standard lead-free reflow profiles without moisture-related popcorning or delamination risks. |
| Glass-passivated junction | Provides stable leakage current (<1 μA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., temperature, pressure) in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within nanoseconds to transients exceeding 58.1 V. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers and ADC inputs during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V DC field wiring exposed to relay coil flyback and EMI coupling. IC Role / Device Role / Timing Role: Standoff protector shunting surge energy to ground before it reaches optocoupler or Schmitt trigger input stages. Use Value: Maintains functional safety integrity by limiting transient voltage to ≤92 V, well below 100 V isolation barrier ratings. |
| Telecom Power Line | Consumer Device USB Port |
|
Use Scenario: Secondary-side protection on PoE-powered Ethernet switches where DC bias (48 V) coexists with fast-rising common-mode surges. IC Role / Device Role / Timing Role: Bidirectional clamping element across power rail and return, activated only during overvoltage excursions. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) without derating due to its 1500 W rating and low thermal resistance. |
Use Scenario: ESD and surge suppression on USB 2.0 data lines (D+/D−) in smart home hubs subjected to human-body model discharges. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor (typ. <50 pF) placed directly at connector entry point. Use Value: Preserves signal integrity up to 480 Mbps while absorbing ±15 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68CA-E3/57T | Same 68 V bidirectional rating but lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W). | Limited to lower-energy threats (IEC 61000-4-2 ESD only); unsuitable for lightning-level surges. | Select when board space is constrained and surge threat level is ≤400 W. |
| SMCJ68CAHE3/9AT | Same 68 V rating, AEC-Q101 qualified, but higher PPPM (3000 W), larger SMC package with identical footprint and pinout. | Over-spec'd for most 1500 W applications; adds cost and thermal mass without benefit unless >2 kA surge currents expected. | Select only if system-level testing confirms need for >2000 W surge handling capability. |
Compared with SMAJ68CA-E3/57T, SM15T68CAHE3/9AT delivers 275% higher surge power handling in the same SMC footprint, while SMCJ68CAHE3/9AT offers double the power rating at the cost of increased bill-of-materials expense and no improvement in clamping performance for typical 10/1000 μs threats.
Availability
SM15T68CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom power line surge suppression requiring stable component supply, AEC-Q101 compliance, and 1500 W transient immunity.
Supply support for SM15T68CAHE3/9AT 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SM15T Series is engineered specifically for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against lightning and inductive switching surges is mandatory.
FAQ
What does the "CA" suffix indicate in SM15T68CAHE3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning SM15T68CAHE3/9AT provides symmetrical clamping in both polarities-unlike unidirectional variants ending in "A". This allows placement across any two-node interface without regard to polarity, simplifying layout for differential or AC-coupled signal lines.
Is SM15T68CAHE3/9AT qualified for automotive use?
Yes, SM15T68CAHE3/9AT carries the "HE3" suffix, confirming full AEC-Q101 qualification per Vishay's documentation. It has passed stress tests including high-temperature operating life, temperature cycling, and ESD-HBM up to ±8 kV, making it suitable for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage of SM15T68CAHE3/9AT under surge conditions?
The maximum clamping voltage (VC) of SM15T68CAHE3/9AT is 92.0 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 16.3 A. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
How does SM15T68CAHE3/9AT differ from SM15T68AHE3/9AT?
SM15T68CAHE3/9AT is bidirectional, whereas SM15T68AHE3/9AT is unidirectional. The latter features a cathode band marking and conducts only in reverse bias, requiring correct polarity orientation. Both share identical VBR, VC, and PPPM ratings, but only the "CA" version supports AC or floating-line protection without polarity constraints.
What PCB pad layout is recommended for optimal thermal performance of SM15T68CAHE3/9AT?
Vishay specifies mounting SM15T68CAHE3/9AT on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve the published RθJA of 75 °C/W. Smaller pads increase thermal resistance and reduce surge current handling capability, potentially leading to premature failure during repeated transients.
SM15T68CAHE3/9AT 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T68CAHE3/9AT FAQ
1.How can I place an order for SM15T68CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T68CAHE3/9AT 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 SM15T68CAHE3/9AT reliable?
The price and inventory of SM15T68CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T68CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T68CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T68CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T68CAHE3/9AT?
SM15T68CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T68CAHE3/9AT 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 SM15T68CAHE3/9AT?
For technical support, including SM15T68CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T68CAHE3/9AT requirements.
6.How does Aetrix verify that SM15T68CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T68CAHE3/9AT 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 SM15T68CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T68CAHE3/9AT?
All SM15T68CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T68CAHE3/9AT, 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 SM15T68CAHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T68CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T68CAHE3/9AT Tags
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