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Vishay General Semiconductor - Diodes Division SM6T68CA-E3/5B
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- Part No.:
- SM6T68CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CA-E3/5B.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,368
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Product details
Overview
SM6T68CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 68 V breakdown voltage (VBR), 92 V maximum clamping voltage (VC) at 6.5 A IPPM, 600 W peak pulse power (10/1000 μs), and operates from −65 °C to +150 °C junction temperature - used in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the SM6T68CA-E3/5B datasheet, SM6T68CA-E3/5B pinout, SM6T68CA-E3/5B application, or SM6T68CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.35), RoHS-compliant matte tin terminations, MSL Level 1 rating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to provide symmetrical clamping in both polarities without polarity marking. Its 600 W peak pulse power rating is validated under standardized 10/1000 μs waveform conditions with derating above 25 °C ambient per Fig. 2.
The device achieves low-inductance performance due to its SMB package geometry and internal chip layout, enabling fast response to transients as short as 10 ns. Thermal resistance is specified at RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), supporting reliable operation under repetitive surge stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA test current - defines symmetric breakdown threshold in both directions |
| VWM | 58.1 V - maximum continuous reverse stand-off voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - clamping voltage limiting downstream circuit stress during surge |
| PPPM | 600 W - peak transient power handling capacity under standard lightning-surge waveform |
| TJ range | −65 °C to +150 °C - enables use in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - surface-mount outline with 0.220" x 0.205" footprint and MSL Level 1 rating |
| RoHS status | E3 suffix - RoHS-compliant, commercial-grade, matte tin-plated leads per J-STD-002 |
Pinout & Package
SM6T68CA-E3/5B is a two-terminal bidirectional TVS diode housed in an SMB (DO-214AA) plastic package with no polarity marking. The device has no cathode/anode designation; both terminals are functionally identical for transient suppression in AC or differential signal paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Connected across protected line and reference (e.g., signal–GND or line–line); conducts during overvoltage in either direction |
| Terminal 2 | Transient input/output node | Electrically symmetric to Terminal 1; forms bidirectional clamping path with no directional bias requirement |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 50 Ω lines with margin |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 μA at VWM) over temperature and lifetime |
| Low-inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., ESD >1 kV/ns) due to compact leadframe geometry |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without preconditioning - compatible with standard SMT lines |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground to limit transient voltage to <92 V. Use Value: Prevents damage to downstream op-amps or ADC inputs by clamping 600 W surges while maintaining <1 μA leakage at 58.1 V operating bias. | Use Scenario: Safeguarding RS-485, Modbus, or 4–20 mA loop interfaces in PLCs and motor drives against induced lightning surges. IC Role / Device Role / Timing Role: Line-to-line or line-to-ground TVS on differential bus pairs to absorb common-mode and differential-mode transients. Use Value: Maintains signal integrity during 10/1000 μs surges up to 6.5 A while exhibiting <10.4 × 10−4/°C VBR temperature coefficient. |
| Consumer USB/Display Interface | Telecom Power Rail Clamping |
Use Scenario: ESD protection for HDMI, USB 2.0, or MIPI D-PHY data lanes in set-top boxes and displays. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on high-speed signal pairs to suppress ±8 kV contact ESD per IEC 61000-4-2. Use Value: Delivers sub-100 ps response time and clamps transients below IC absolute maximum ratings without distorting 480 Mbps signals. | Use Scenario: Secondary-side clamping on 12 V or 24 V DC power rails feeding base station RF modules or optical transceivers. IC Role / Device Role / Timing Role: Overvoltage limiter placed after DC/DC converter output to protect sensitive RF ICs from supply rail transients. Use Value: Handles repetitive 600 W pulses without degradation, supported by 150 °C max junction rating and 100 °C/W thermal resistance to ambient. |
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 | Same VBR (64.6–71.4 V), lower PPPM = 400 W, SMA package (larger RθJA = 140 °C/W) | Lower surge margin; less suitable for repeated 600 W events or high-temperature PCB layouts | Select when cost sensitivity outweighs peak power headroom and board space permits larger SMA footprint |
| 1.5KE68CA | Same VBR, higher PPPM = 1500 W, axial DO-201 package (not SMT-compatible) | Requires through-hole assembly; incompatible with automated SMT lines and dense PCBs | Choose only for legacy through-hole designs where 1.5 kW surge immunity is mandatory and rework is acceptable |
Compared with SMAJ68CA and 1.5KE68CA, SM6T68CA-E3/5B delivers optimal balance of 600 W surge capability, SMB SMT compatibility, MSL Level 1 process readiness, and 58.1 V working voltage - making it preferred for new automotive and industrial PCB designs requiring RoHS-compliant, high-volume placement.
Availability
SM6T68CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and telecom power rail clamping requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SM6T68CA-E3/5B 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 and automotive qualification.
The SM6T Series is engineered specifically for robust transient suppression in harsh environments - targeting AEC-Q101-compliant automotive systems, industrial controls, and telecom infrastructure where consistent clamping performance and SMT manufacturability are critical.
FAQ
What is the clamping voltage of SM6T68CA-E3/5B at its rated peak pulse current?
The SM6T68CA-E3/5B has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 6.5 A. This value is measured per Figure 1 in the official Vishay datasheet (Doc. #88385, Rev. 09-Jan-2024) and reflects the actual voltage seen by protected circuitry during worst-case surge events. The clamping ratio (VC/VBR) is approximately 1.35, indicating effective transient suppression for the SM6T68CA-E3/5B.
Is SM6T68CA-E3/5B suitable for automotive applications?
Yes, SM6T68CA-E3/5B is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes. While the E3/5B variant is commercial-grade, its electrical specs - including 150 °C max junction temperature, glass-passivated junction, and robust 600 W surge rating - align with automotive subsystem requirements such as body control modules and sensor interfaces. For certified automotive use, specify SM6T68CAHE3_B/I or confirm qualification status with Vishay documentation for the exact ordering code.
What does the "CA" suffix indicate in SM6T68CA-E3/5B?
The "CA" suffix in SM6T68CA-E3/5B explicitly denotes a bidirectional configuration. Unlike unidirectional variants (e.g., SM6T68A), this device provides symmetrical clamping in both polarities - essential for protecting AC-coupled signals, differential buses like RS-485, or floating sensor outputs. No polarity marking is present on the SMB package, confirming its bidirectional functionality per Vishay's SM6T series documentation.
What is the thermal resistance of SM6T68CA-E3/5B, and how does it affect PCB layout?
The SM6T68CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad area increases thermal resistance and risks exceeding 150 °C junction temperature during repetitive surges. Layout must follow the outlined dimensions to ensure reliable SM6T68CA-E3/5B operation under sustained power dissipation.
How does the E3/5B packaging differ from other variants like E3/52?
The "E3/5B" suffix indicates RoHS-compliant, commercial-grade SM6T68CA supplied in 13-inch diameter plastic tape and reel with a base quantity of 3200 units. In contrast, "E3/52" uses a 7-inch reel holding 750 units. Both share identical electrical and mechanical specifications; the difference lies solely in packaging format and quantity - selected based on production volume and SMT feeder compatibility. SM6T68CA-E3/5B supports high-throughput automated placement without functional or reliability trade-offs.
SM6T68CA-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 6.5A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SM6T68CA-E3/5B FAQ
1.How can I place an order for SM6T68CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CA-E3/5B 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 SM6T68CA-E3/5B reliable?
The price and inventory of SM6T68CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T68CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CA-E3/5B?
SM6T68CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CA-E3/5B 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 SM6T68CA-E3/5B?
For technical support, including SM6T68CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CA-E3/5B requirements.
6.How does Aetrix verify that SM6T68CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T68CA-E3/5B 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 SM6T68CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T68CA-E3/5B?
All SM6T68CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CA-E3/5B, 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 SM6T68CA-E3/5B part is unused and in its original packaging.
Return procedure for SM6T68CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CA-E3/5B Tags
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