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Vishay General Semiconductor - Diodes Division SM6T68CA-E3/52
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- Part No.:
- SM6T68CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CA-E3/52.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,065
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Product details
Overview
SM6T68CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 68 V breakdown voltage (VBR = 64.6–71.4 V at IT = 1.0 mA), 58.1 V stand-off voltage (VWM), 92.0 V maximum clamping voltage (VC) at 6.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SM6T68CA-E3/52 datasheet, SM6T68CA-E3/52 pinout, SM6T68CA-E3/52 application, or SM6T68CA-E3/52 equivalent, this device is selected for robust ESD and surge protection in automotive sensor interfaces, industrial I/O modules, and telecom line drivers where bidirectional clamping, low clamping ratio, and AEC-Q101-compliant variants are required.
Technical Context
The SM6T68CA-E3/52 operates as a symmetrical, bidirectional avalanche diode with no polarity marking, enabling identical clamping behavior in both directions. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while its low-inductance SMB package supports fast transient response under 10/1000 μs surges.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, with a maximum junction temperature of +150 °C and operation down to –65 °C. It is rated for non-repetitive peak pulse current up to 6.5 A (10/1000 μs) and meets MSL Level 1 per J-STD-020 at 260 °C peak reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1.0 mA test current - defines precise avalanche onset window for reliable bidirectional clamping |
| VWM | 58.1 V - maximum continuous reverse voltage before leakage exceeds 1.0 μA; sets safe operating margin below VBR |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - actual clamped voltage seen by protected circuit during surge event |
| PPPM | 600 W - peak transient power handling capability under standardized 10/1000 μs waveform |
| IPPM | 6.5 A - maximum non-repetitive surge current the device can safely clamp without failure |
| Junction Temp Range | –65 °C to +150 °C - enables deployment in under-hood automotive, industrial control, and outdoor telecom environments |
Pinout & Package
SMB (DO-214AA) surface-mount package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, footprint optimized for automated placement and reflow soldering. No polarity marking - bidirectional functionality confirmed by CA suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction; either end serves as anode or cathode depending on transient polarity - enables single-component protection of AC or differential lines |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with low-inductance PCB traces |
| Glass passivated junction | Ensures long-term stability of VBR and low parametric drift over temperature and lifetime |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns |
| AEC-Q101 qualified variant available | Enables drop-in qualification path for automotive applications (e.g., SM6T68CAHE3_B/H) without redesign |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role: Bidirectional clamping element placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤92.0 V during 6.5 A surges, preserving signal integrity and preventing latch-up in downstream ASICs. |
Use Scenario: Shielding 24 V DC digital input modules in programmable logic controllers from inductive kickback and field wiring surges. IC Role / Device Role: Primary surge suppression component mounted at connector entry point before optocoupler or Schmitt trigger input stage. Use Value: Withstands repeated 600 W transients without degradation, extending system uptime in factory automation environments. |
| Telecom Line Driver Protection | Consumer Power Adapter ESD Guard |
Use Scenario: Safeguarding RS-485/RS-422 transceivers in base station backhaul equipment exposed to lightning-induced surges on long cable runs. IC Role / Device Role: Low-capacitance (typ. <100 pF at 0 V) bidirectional TVS placed between differential pairs and ground. Use Value: Clamps common-mode transients to <92.0 V while maintaining signal fidelity up to 10 Mbps due to minimal parasitic capacitance. |
Use Scenario: Adding secondary-level ESD protection on 5 V/12 V USB and auxiliary power rails inside smart home hubs and set-top boxes. IC Role / Device Role: Standoff-voltage-matched (58.1 V) TVS placed after primary fuse and upstream of LDO regulators. Use Value: Prevents catastrophic failure during human-body-model (HBM) >15 kV ESD events without affecting steady-state regulation. |
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 range (64.6–71.4 V) but lower PPPM = 400 W; SMA package (DO-214AC), larger RθJA = 125 °C/W | Limited to lower-energy transients; less suitable for IEC 61000-4-5 Level 4 compliance without derating | Select SMAJ68CA only if board space allows larger SMA footprint and thermal budget permits higher junction rise |
| 1.5KE68CA | Higher PPPM = 1500 W but axial DO-15 package; slower response due to higher parasitic inductance | Not SMT-compatible; requires through-hole assembly and compromises high-frequency surge suppression | Choose 1.5KE68CA only for legacy through-hole designs where PCB rework is prohibitive and surge energy exceeds 600 W |
Compared with SMAJ68CA and 1.5KE68CA, the SM6T68CA-E3/52 delivers optimal balance of 600 W surge capacity, SMB footprint compatibility, and low-clamp-voltage performance-making it preferred for new SMT-based automotive and industrial designs requiring AEC-Q101 readiness and JEDEC-compliant reflow.
Availability
SM6T68CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line driver circuits requiring stable component supply, RoHS-compliant packaging, and consistent surge performance across production batches.
Supply support for SM6T68CA-E3/52 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, precision, and application-specific optimization.
The SM6T Series was engineered for high-reliability transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom systems where bidirectional clamping, low leakage, and AEC-Q101 qualification are mandatory design requirements.
FAQ
What does the "CA" suffix indicate in SM6T68CA-E3/52?
The "CA" suffix in SM6T68CA-E3/52 explicitly denotes a bidirectional configuration - meaning the device provides symmetrical clamping in both polarities without polarity marking. This distinguishes it from unidirectional variants like SM6T68A, which feature a cathode band and conduct only in reverse bias. The CA version is essential for protecting AC-coupled or differential signal paths where transient polarity is unpredictable.
Is SM6T68CA-E3/52 RoHS-compliant and halogen-free?
Yes, SM6T68CA-E3/52 carries the "E3" suffix, indicating full RoHS compliance per EU Directive 2011/65/EU and exemption 7a. It is not halogen-free; for halogen-free and RoHS-compliant versions, the "M3" suffix (e.g., SM6T68CA-M3/52) must be specified. Both E3 and M3 meet JESD 201 Class 2 whisker resistance requirements.
What is the maximum clamping voltage of SM6T68CA-E3/52 under surge conditions?
The maximum clamping voltage (VC) of SM6T68CA-E3/52 is 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 Vishay document 88385 and represents the upper limit of voltage imposed on the protected circuit during worst-case transient events.
Can SM6T68CA-E3/52 be used in automotive applications?
Yes - while the base SM6T68CA-E3/52 is commercial-grade, Vishay offers AEC-Q101-qualified variants under ordering codes such as SM6T68CAHE3_B/H (RoHS-compliant, automotive grade). These share identical electrical specs and SMB package but include extended reliability testing per AEC-Q101, making them suitable for under-hood and chassis-mounted automotive modules.
What is the thermal resistance of SM6T68CA-E3/52, and how does it affect layout?
SM6T68CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain safe junction temperatures during repetitive surges, PCB layout must use minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay's recommended pad layout - undersized pads will cause excessive thermal derating and premature failure.
SM6T68CA-E3/52 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-E3/52 FAQ
1.How can I place an order for SM6T68CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CA-E3/52 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-E3/52 reliable?
The price and inventory of SM6T68CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T68CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CA-E3/52?
SM6T68CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CA-E3/52 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-E3/52?
For technical support, including SM6T68CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CA-E3/52 requirements.
6.How does Aetrix verify that SM6T68CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T68CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T68CA-E3/52?
All SM6T68CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SM6T68CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CA-E3/52 Tags
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