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Vishay General Semiconductor - Diodes Division SM6T68A-E3/52
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- Part No.:
- SM6T68A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68A-E3/52.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,552
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Product details
Overview
SM6T68A-E3/52 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 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 150 °C max junction temperature - deployed in automotive sensor protection and industrial power supply surge suppression.
For engineers reviewing the SM6T68A-E3/52 datasheet, SM6T68A-E3/52 pinout, SM6T68A-E3/52 application, or SM6T68A-E3/52 equivalent, key selection criteria include unidirectional polarity, SMB package thermal resistance (RθJA = 100 °C/W), clamping performance under 10/1000 μs surges, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
The SM6T68A-E3/52 operates as a unidirectional avalanche diode with glass-passivated junction, optimized for low-inductance transient suppression in DC power rails and low-speed signal paths. Its 10/1000 μs waveform response delivers 6.5 A peak pulse current (IPPM) while maintaining clamping below 92.0 V, enabling robust protection of downstream MOSFETs and ICs against inductive switching spikes.
Thermally, it uses SMB (DO-214AA) package with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, rated for 150 °C operation and MSL Level 1 reflow (260 °C peak). The device exhibits 100 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads, limiting continuous dissipation to 5.0 W at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines reliable avalanche onset range for consistent clamping threshold |
| VWM | 58.1 V - maximum continuous reverse voltage before leakage exceeds 1 μA, sets operating margin below VBR |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - peak clamped voltage seen by protected circuit during surge event |
| PPPM | 600 W - peak transient power handling capability under standardized 10/1000 μs waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on recommended PCB pad layout |
| TJ max | 150 °C - maximum allowable junction temperature for sustained reliability in automotive/industrial environments |
| ID @ VWM | ≤1.0 μA - reverse leakage current at stand-off voltage, critical for low-power sensor line integrity |
Pinout & Package
SMB (DO-214AA) surface-mount package with cathode band marking; terminals are matte tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Provides return path during transient conduction; must be routed with low-inductance trace to minimize VL = L·di/dt overshoot |
| Cathode | Current exit terminal in forward bias; marked with band, connected to protected line | Clamps positive transients to ground; polarity-sensitive placement required to avoid reverse-bias failure |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 7637-2 Pulse 1/2a/5a-level surges in 12 V automotive systems |
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., <100 ns edges), improving clamping fidelity |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning, reducing manufacturing complexity |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring validated reliability per stress test requirements |
Applications
| Automotive Sensor Protection | Industrial Power Supply Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground to clamp positive overvoltage events. Use Value: Maintains signal integrity by limiting transient voltage to ≤92.0 V while surviving 600 W pulses - preventing latch-up or gate oxide damage in connected ASICs. |
Use Scenario: Safeguarding AC-DC and DC-DC converter inputs against lightning-induced surges and inductive kickback from relay coils. IC Role / Device Role / Timing Role: Primary clamping device across bulk input capacitor, shunting energy before it reaches rectifier and controller ICs. Use Value: Withstands 100 A IFSM (10 ms half-sine) and 6.5 A IPPM, enabling robust front-end protection without derating in 24 V industrial systems. |
| Consumer Equipment Power Rails | Telecom Line Interface |
Use Scenario: Securing USB-C PD and 5 V/12 V system rails in smart home hubs and set-top boxes against ESD and hot-swap transients. IC Role / Device Role / Timing Role: Point-of-load TVS on VBUS and auxiliary supply lines, positioned adjacent to connectors. Use Value: Low 1.0 μA leakage at 58.1 V VWM prevents standby current drain; SMB footprint enables high-density layout near I/O ports. |
Use Scenario: Shielding Ethernet PHY interfaces and RS-485 transceivers from induced surges on outdoor cabling in base stations and network switches. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy post-GDT crowbar action. Use Value: 92.0 V clamping ensures protected ICs remain within absolute maximum ratings even when GDT fires at >300 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68A | Same SMB package, but lower PPPM (400 W), higher VC (110 V @ 5.5 A), and no AEC-Q101 variant path | Less suitable for automotive load-dump compliance; adequate for consumer-grade 12 V rail protection | Select SMAJ68A only if 600 W rating is not required and cost sensitivity outweighs surge margin |
| 1.5SMC68A | Higher power (1500 W), larger SMC (DO-214AB) package, 100 °C/W RθJA on same pad size, VC = 110 V @ 13.7 A | Requires PCB redesign for larger footprint; better for high-energy telecom surge standards (IEC 61000-4-5) | Choose 1.5SMC68A when system-level testing requires >600 W margin or legacy SMC board space is available |
Compared with SMAJ68A and 1.5SMC68A, SM6T68A-E3/52 delivers optimal balance of 600 W surge capacity, SMB footprint compatibility, and AEC-Q101 upgrade path - making it preferred for new automotive and industrial designs where space, reliability, and standardized testing alignment are prioritized.
Availability
SM6T68A-E3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial power supply input stages, and consumer equipment power rails requiring stable component supply, RoHS-compliant packaging, and verified surge performance.
Supply support for SM6T68A-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 passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for transient voltage suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against inductive switching, ESD, and lightning-induced surges is mandatory.
FAQ
What is the polarity configuration of the SM6T68A-E3/52?
The SM6T68A-E3/52 is a unidirectional TVS diode, with the cathode identified by a band on the SMB package body. This configuration allows it to clamp only positive-going transients relative to ground, making it suitable for DC power rail protection where polarity is fixed and reverse voltage is not expected.
Does the SM6T68A-E3/52 meet automotive qualification standards?
The SM6T68A-E3/52 itself is commercial-grade (RoHS-compliant, E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3 and HM3 suffixes (e.g., SM6T68AHE3_A). These variants undergo stress testing per AEC-Q101 and are designated for automotive use - the E3/52 part is not AEC-Q101 qualified out of the box.
What is the maximum clamping voltage of the SM6T68A-E3/52 under surge conditions?
The SM6T68A-E3/52 has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000 μs waveform at 6.5 A peak pulse current. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events.
Can the SM6T68A-E3/52 be used in bidirectional applications?
No - the SM6T68A-E3/52 is strictly unidirectional. For bidirectional transient suppression, Vishay specifies devices with "CA" suffix (e.g., SM6T68CA), which feature symmetrical breakdown in both polarities and no polarity marking. Using SM6T68A-E3/52 in AC or reversible signal paths risks reverse breakdown failure.
What is the thermal resistance of the SM6T68A-E3/52 in standard mounting conditions?
The SM6T68A-E3/52 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 assumes standard SMB PCB layout and natural convection cooling - forced airflow or additional copper area reduces effective RθJA.
SM6T68A-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:
- 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-E3/52 FAQ
1.How can I place an order for SM6T68A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68A-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 SM6T68A-E3/52 reliable?
The price and inventory of SM6T68A-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 SM6T68A-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T68A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68A-E3/52?
SM6T68A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68A-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 SM6T68A-E3/52?
For technical support, including SM6T68A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68A-E3/52 requirements.
6.How does Aetrix verify that SM6T68A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T68A-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 SM6T68A-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T68A-E3/52?
All SM6T68A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68A-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 SM6T68A-E3/52 part is unused and in its original packaging.
Return procedure for SM6T68A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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