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Vishay General Semiconductor - Diodes Division SM6T68A-M3/5B
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- Part No.:
- SM6T68A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68A-M3/5B.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,398
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Product details
Overview
SM6T68A-M3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 58.1 V stand-off voltage (VWM), 64.6–71.4 V breakdown voltage (VBR at 1 mA), 92.0 V max clamping voltage (VC) at 6.5 A, 600 W peak pulse power (10/1000 μs), and operates from −65 °C to +150 °C - used for protecting MOSFETs and sensor interfaces in automotive ECUs.
For engineers reviewing the SM6T68A-M3/5B datasheet, SM6T68A-M3/5B pinout, SM6T68A-M3/5B application, or SM6T68A-M3/5B equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, IPPM derating above 25 °C, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SM6T68A-M3/5B implements a glass-passivated silicon junction optimized for fast response (<1 ns) to ESD and lightning-induced surges. Its low-inductance SMB package enables effective suppression of high-dI/dt transients without oscillation, while meeting J-STD-020 MSL Level 1 reflow compatibility (260 °C peak).
It operates as a shunt-clamping device: below VWM = 58.1 V, leakage remains ≤1 μA; at VBR = 64.6–71.4 V (1 mA test current), avalanche conduction initiates; and at IPPM = 6.5 A (10/1000 μs), it clamps to ≤92.0 V - delivering predictable protection with minimal forward voltage drop during surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line DC bias |
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines guaranteed avalanche onset range; ensures reliable triggering across temperature and lot variation |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - peak clamped voltage seen by downstream circuitry during worst-case surge |
| PPPM | 600 W - surge energy handling capacity under standardized 10/1000 μs waveform; determines survivability against IEC 61000-4-5 Level 4 |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs layout cooling requirements |
Pinout & Package
SMB (DO-214AA) surface-mount package with molded plastic body, matte tin-plated leads, and cathode band marking on the unidirectional SM6T68A-M3/5B. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); recommended pad layout: 5.59 mm × 1.52 mm per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage event |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; resists humidity and contamination in harsh environments |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns; eliminates bake-out requirement |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills automotive and industrial environmental compliance mandates; avoids corrosive decomposition products during reflow or failure |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt TVS diode placed between VIN and GND, triggered only during overvoltage events >58.1 V. Use Value: Limits clamped voltage to ≤92.0 V, staying safely below typical 100 V absolute max rating of automotive-grade LDOs and MCUs. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors exposed to field wiring induced surges. IC Role / Device Role / Timing Role: Unidirectional clamp on signal line referenced to local ground, absorbing positive-going transients. Use Value: With 1 μA max leakage at 58.1 V, introduces negligible error in precision current-loop measurement circuits. |
| Consumer Power Adapter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side DC bus protection in AC/DC adapters subjected to conducted surges from mains or connected devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on +VOUT rail, clamping fast transients before they reach downstream regulators. Use Value: 600 W rating handles repetitive 10/1000 μs surges common in shared building power systems without degradation. | Use Scenario: Front-end protection of Ethernet PHY power pins in network switches deployed in lightning-prone regions. IC Role / Device Role / Timing Role: Unidirectional suppressor on 3.3 V or 5 V supply rails feeding PHY ICs. Use Value: 92.0 V clamping voltage provides ≥2× margin over 48 V PoE voltage, preventing latch-up or oxide rupture in PHY transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Same SMB package; lower PPPM = 400 W; VC = 103 V @ 3.9 A; VWM = 64 V | Lower surge handling limits suitability for IEC 61000-4-5 Level 3+; higher clamping voltage reduces safety margin | Select when cost sensitivity outweighs 600 W requirement and layout allows tighter thermal management |
| 1.5SMC68A | Higher-power SMC package (PPPM = 1500 W); same VWM/VBR range; VC = 112 V @ 13.4 A | Larger footprint (7.11 mm × 6.22 mm) requires PCB redesign; better for repeated high-energy surges | Choose for industrial motor drives where surge repetition rate exceeds SM6T series endurance |
Compared with SMAJ64A and 1.5SMC68A, the SM6T68A-M3/5B delivers optimal balance of 600 W surge capability, compact SMB footprint, and 92.0 V clamping - making it preferred for space-constrained automotive and industrial modules requiring AEC-Q101-compatible reliability without SMC-level board area.
Availability
SM6T68A-M3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer power adapter secondary-side protection, and telecom line card surge suppression requiring stable component supply and halogen-free compliance.
Supply support for SM6T68A-M3/5B 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, power efficiency, and automotive qualification.
The SM6T Series is engineered for high-reliability transient suppression in demanding environments - targeting automotive, industrial, and telecom applications where consistent clamping performance, low leakage, and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of the SM6T68A-M3/5B under a 10/1000 μs surge?
The SM6T68A-M3/5B has a maximum clamping voltage (VC) of 92.0 V when subjected to a 6.5 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88385 and represents the upper bound of voltage seen by protected circuitry during standardized surge testing - critical for ensuring downstream components remain within their absolute maximum ratings. The SM6T68A-M3/5B maintains this clamping performance across its specified operating temperature range.
Does the SM6T68A-M3/5B meet automotive qualification standards?
The base SM6T68A-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring AEC-Q101, Vishay offers the HM3-suffixed variant (e.g., SM6T68AHM3_B/I). The SM6T68A-M3/5B shares identical electrical characteristics and SMB packaging with the qualified version, differing only in traceability and test reporting - so design-in of SM6T68A-M3/5B is valid for prototyping, with HM3 variants used for production release in automotive ECUs.
How does the SM6T68A-M3/5B differ from bidirectional TVS diodes like SM6T68CA?
The SM6T68A-M3/5B is unidirectional and features a cathode band marking; it conducts only during positive transients relative to its anode. In contrast, SM6T68CA is bidirectional with no polarity marking and clamps both positive and negative excursions. The SM6T68A-M3/5B exhibits 1 μA max reverse leakage at 58.1 V, whereas SM6T68CA doubles leakage to 2 μA for VWM ≤10 V - though both share identical VBR, VC, and PPPM. Use SM6T68A-M3/5B for DC-biased lines like power rails; use SM6T68CA for AC or floating signal paths.
What is the thermal resistance of the SM6T68A-M3/5B, and how does it affect layout?
The SM6T68A-M3/5B 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. This value means each watt of sustained power dissipation raises junction temperature by 100 °C above ambient - so at 5.0 W rated power, ΔT = 500 °C (exceeding TJmax). Thus, the SM6T68A-M3/5B relies on short-duration pulses, not continuous dissipation; layout must prioritize low-inductance grounding and avoid thermal bottlenecks near the cathode/anode pads to preserve surge response.
Can the SM6T68A-M3/5B be used in place of the older SMA6J68A?
No - the SM6T68A-M3/5B is not a direct replacement for SMA6J68A. While both are unidirectional SMB TVS diodes, SMA6J68A has VWM = 68 V, VBR = 75.6–83.6 V, and VC = 110 V @ 5.5 A, resulting in significantly higher clamping voltage and reduced protection margin. The SM6T68A-M3/5B's lower VWM (58.1 V) and tighter VBR (64.6–71.4 V) provide earlier, more precise clamping. Substituting SM6T68A-M3/5B for SMA6J68A may cause premature conduction in normal operation; verify system DC bias margins before replacement.
SM6T68A-M3/5B 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:
- 1
- Bidirectional Channels:
- -
- 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)
SM6T68A-M3/5B FAQ
1.How can I place an order for SM6T68A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68A-M3/5B 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 SM6T68A-M3/5B reliable?
The price and inventory of SM6T68A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68A-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T68A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68A-M3/5B?
SM6T68A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68A-M3/5B 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 SM6T68A-M3/5B?
For technical support, including SM6T68A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68A-M3/5B requirements.
6.How does Aetrix verify that SM6T68A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T68A-M3/5B 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 SM6T68A-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T68A-M3/5B?
All SM6T68A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68A-M3/5B, 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 SM6T68A-M3/5B part is unused and in its original packaging.
Return procedure for SM6T68A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68A-M3/5B Tags
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