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Vishay General Semiconductor - Diodes Division SM6T68CA-M3/52
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- Part No.:
- SM6T68CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CA-M3/52.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,669
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Product details
Overview
SM6T68CA-M3/52 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 1 mA), 58.1 V stand-off voltage (VWM), 92.0 V max clamping voltage (VC) at 6.5 A (10/1000 μs), 600 W peak pulse power, and operates from −65 °C to +150 °C - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the SM6T68CA-M3/52 datasheet, SM6T68CA-M3/52 pinout, SM6T68CA-M3/52 application, or SM6T68CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, SMB footprint compatibility, 600 W surge rating with 10/1000 μs waveform, low leakage (<1 μA at VWM), and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SM6T68CA-M3/52 implements a silicon avalanche junction structure optimized for fast response (<1 ns) to ESD and lightning-induced transients. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints, and its low dynamic impedance ensures stable clamping across the full rated current range.
Designed for surface-mount assembly on standard PCB pads (0.2" × 0.2" copper), it meets J-STD-020 MSL Level 1 and supports reflow up to 260 °C peak. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation under repetitive surge conditions when properly mounted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise avalanche onset threshold for bidirectional clamping |
| VWM | 58.1 V - maximum continuous reverse voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - actual clamped voltage seen by protected circuit during surge |
| PPPM | 600 W - peak transient power handling capacity under standardized 10/1000 μs waveform |
| IFSM | Not applicable - bidirectional device has no forward surge rating |
| TJ range | −65 °C to +150 °C - enables deployment in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with 5.59 mm body length and 2.20 mm height |
Pinout & Package
SMB (DO-214AA) package: surface-mount, molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking (bidirectional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction - either terminal serves as cathode or anode depending on transient polarity; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in compact SMB footprint |
| Glass passivated chip junction | Ensures long-term stability of breakdown voltage and leakage performance under thermal cycling and humidity stress |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU environmental compliance for automotive and industrial BOMs |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >1 kV/ns), improving clamping fidelity |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow without preconditioning or special handling |
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 / Timing Role: Bidirectional TVS placed between signal line and ground to clamp ±100 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V interface ICs while maintaining signal integrity below 58.1 V operating window. | Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across input terminals to limit voltage to ≤92 V during 6.5 A surge events. Use Value: Eliminates need for external series impedance or RC filtering, reducing component count and board space in DIN-rail mounted control hardware. |
| Telecom Line Interface | Consumer USB/Display Port ESD Protection |
Use Scenario: Shielding RS-485/RS-422 differential pairs in base station backhaul equipment from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired SM6T68CA-M3/52 devices (one per line) referenced to chassis ground to suppress ±600 V transients. Use Value: Maintains signal eye diagram integrity by limiting clamping overshoot to <92 V with sub-1 ns response, meeting Telcordia GR-1089-CORE immunity requirements. | Use Scenario: Secondary-level surge protection on HDMI or USB 2.0 data lanes in set-top boxes and monitors exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF typical at 0 V) placed inline to shunt HBM ±8 kV discharges. Use Value: Adds <1.5 ns propagation delay and avoids signal attenuation above 480 Mbps, preserving high-speed link reliability without retiming. |
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 (smaller footprint, higher RθJA = 140 °C/W) | Less suitable for repeated 600 W surges; preferred where board space is constrained and thermal margin exists | Select SMAJ68CA only if peak surge energy is limited to ≤400 W and ambient temperature remains <85 °C |
| 1.5KE68CA | Higher PPPM = 1500 W but axial DO-201 package; slower response due to higher parasitic inductance | Requires through-hole mounting; not compatible with automated SMT lines or dense PCB layouts | Choose 1.5KE68CA only for legacy through-hole designs or where extreme single-event energy absorption (>100 mJ) is required |
Compared with SMAJ68CA and 1.5KE68CA, the SM6T68CA-M3/52 delivers optimal balance of 600 W surge capability, SMB SMT compatibility, and thermal performance - making it the preferred choice for new automotive and industrial designs requiring RoHS/halogen-free compliance and MSL Level 1 reflow support.
Availability
SM6T68CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer display port surge suppression requiring stable component supply and halogen-free compliance.
Supply support for SM6T68CA-M3/52 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, power efficiency, and automotive-grade qualification.
The SM6T Series is engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive (AEC-Q101 qualified variants), industrial control, and telecom infrastructure where consistent clamping performance and long-term stability are critical.
FAQ
What is the breakdown voltage tolerance for SM6T68CA-M3/52?
The SM6T68CA-M3/52 has a specified breakdown voltage (VBR) range of 64.6 V to 71.4 V at 1 mA test current, representing ±5% tolerance around the nominal 68 V rating. This tight distribution ensures predictable clamping behavior across production lots and supports robust design margins in safety-critical applications like automotive sensor interfaces.
Is SM6T68CA-M3/52 suitable for automotive applications?
Yes, the SM6T68CA-M3/52 is halogen-free and RoHS-compliant per its M3 suffix, and belongs to the AEC-Q101-qualified SM6T family. While the exact part number SM6T68CA-M3/52 is commercial-grade, its construction, thermal specs (TJ = −65 °C to +150 °C), and robustness make it widely deployed in non-safety-critical automotive subsystems such as body control modules and infotainment I/O protection.
How does the clamping voltage of SM6T68CA-M3/52 compare to its stand-off voltage?
The SM6T68CA-M3/52 has a stand-off voltage (VWM) of 58.1 V and a maximum clamping voltage (VC) of 92.0 V at 6.5 A (10/1000 μs). This 33.9 V differential provides a 13.9 V design margin above VWM, ensuring protected circuits remain within safe operating limits during surge events while avoiding false triggering during normal operation.
What is the meaning of the "CA" suffix in SM6T68CA-M3/52?
The "CA" suffix in SM6T68CA-M3/52 explicitly denotes a bidirectional configuration - meaning the device functions identically in both polarities and has no cathode marking. This distinguishes it from unidirectional variants (e.g., SM6T68A), which require correct orientation during placement and feature a cathode band. The CA version is ideal for AC signal lines or differential buses.
Does SM6T68CA-M3/52 require derating at elevated ambient temperatures?
Yes, the SM6T68CA-M3/52 must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet (Doc. #88385). At 85 °C, its peak pulse power drops to ~420 W (70% of 600 W), and at 125 °C, it falls to ~240 W (40%). Proper PCB copper pad area (0.2" × 0.2" per terminal) and airflow are essential to maintain performance in high-temperature enclosures.
SM6T68CA-M3/52 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-M3/52 FAQ
1.How can I place an order for SM6T68CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CA-M3/52 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-M3/52 reliable?
The price and inventory of SM6T68CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SM6T68CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CA-M3/52?
SM6T68CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CA-M3/52 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-M3/52?
For technical support, including SM6T68CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CA-M3/52 requirements.
6.How does Aetrix verify that SM6T68CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T68CA-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SM6T68CA-M3/52?
All SM6T68CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CA-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SM6T68CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CA-M3/52 Tags
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