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Vishay General Semiconductor - Diodes Division SM6T68AHM3/H
- Part No.:
- SM6T68AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHM3/H.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,839
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Product details
Overview
SM6T68AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, with 68 V breakdown voltage (VBR = 64.6–71.4 V at 1 mA), 58.1 V stand-off voltage (VWM), 92.0 V clamping voltage (VC) at 6.5 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and sensor signal lines in automotive ECUs against inductive switching transients.
For engineers reviewing the SM6T68AHM3/H datasheet, SM6T68AHM3/H pinout, SM6T68AHM3/H application, or SM6T68AHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMB package thermal data, and direct alternatives for circuit protection design-in.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, designed to shunt transient energy before downstream ICs exceed absolute maximum ratings. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1 μA at VWM).
Rated for 150 °C max junction temperature and MSL Level 1 (260 °C reflow peak), SM6T68AHM3/H supports automated SMT placement on standard PCB pads (0.2" × 0.2") and delivers 100 °C/W junction-to-ambient thermal resistance under natural convection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise clamping onset threshold for overvoltage events |
| VWM | 58.1 V - maximum continuous reverse operating voltage without significant leakage |
| 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 absorption capability without failure |
| IFSM | 100 A - single half-sine surge current rating (10 ms), critical for load-dump immunity |
| TJ max | +150 °C - enables operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMT footprint with 2.2 mm height and 5.6 mm length |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or low-impedance reference plane during clamping |
| Cathode | Transient current input node | Connected to protected line (e.g., sensor supply or CAN bus); band denotes cathode end |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements |
| 600 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/5a transients without degradation when properly mounted |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs compared to higher-ratio suppressors |
| Low inductance layout | Enables sub-nanosecond response time and effective suppression of fast-rising ESD or EFT events |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V supply rails and LIN bus lines from load dump and alternator ripple in engine bay modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach MCU power pins. Use Value: Withstands 100 A surge (IFSM) and maintains VC ≤ 92 V, preventing brownout or latch-up in ASIL-B microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and field wiring surges in factory automation sensors. IC Role / Device Role / Timing Role: Standoff-mode protector on transmitter output, activated only during >58.1 V faults. Use Value: Leakage <1 μA at VWM avoids signal offset errors; SMB footprint allows dense PCB layout near connector entry points. |
| Telecom Power Interface | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding PoE-powered Ethernet PHY interfaces against induced lightning surges on twisted-pair cables. IC Role / Device Role / Timing Role: Secondary-level TVS after primary gas discharge tube, handling residual 10/1000 μs energy. Use Value: 600 W rating absorbs IEEE C62.41 Cat. A/B surge energy; 92 V clamping keeps PHY ICs within safe operating area. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Mounted across motor terminals to divert inductive kickback away from driver FETs. Use Value: 150 °C TJ max enables mounting near hot motor housings; halogen-free construction meets IEC 61249-2-21 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68A-E3/52 | Same VBR range (64.6–71.4 V), but SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-power or space-constrained designs where thermal margin permits | Select when board area is critical and peak ambient temperature stays below 85 °C |
| SMCJ68A-HM3 | Higher PPPM = 1500 W, same SMB package, but larger die and higher VC = 113 V | Better suited for severe ISO 16750-2 load dump events requiring >1 kV surge immunity | Choose when system-level testing reveals insufficient margin with 600 W rating |
Compared with SMAJ68A-E3/52, SM6T68AHM3/H offers superior thermal performance (RθJA = 100 vs. 140 °C/W) and AEC-Q101 qualification; versus SMCJ68A-HM3, it provides tighter clamping (92 V vs. 113 V) at lower cost and smaller junction capacitance, ideal for high-speed signal line protection.
Availability
SM6T68AHM3/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power interface protection requiring stable component supply and long-term lifecycle support.
Supply support for SM6T68AHM3/H 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, and protection devices with emphasis on reliability and automotive qualification.
The SM6T Series was engineered specifically for robust transient suppression in harsh environments, targeting AEC-Q101-compliant automotive subsystems and industrial equipment requiring repeatable clamping performance under thermal stress.
FAQ
What does the "HM3" suffix indicate in SM6T68AHM3/H?
The "HM3" suffix in SM6T68AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates 7" tape-and-reel packaging (750 units per reel), and "/H" is the revision code. This distinguishes it from commercial-grade "E3" or non-automotive "M3" variants, confirming suitability for automotive under-hood applications.
Is SM6T68AHM3/H bidirectional or unidirectional?
SM6T68AHM3/H is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and the presence of a cathode band marking. Its electrical characteristics apply only in reverse-bias mode; forward conduction follows standard silicon diode behavior with ~1.2 V drop at rated current.
What is the maximum clamping voltage of SM6T68AHM3/H under standard test conditions?
The maximum clamping voltage of SM6T68AHM3/H is 92.0 V, measured at 6.5 A peak pulse current using a 10/1000 μs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and forms the basis for protected circuit voltage margining in designs.
Does SM6T68AHM3/H meet automotive qualification standards?
Yes, SM6T68AHM3/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number 88385, Revision 09-Jan-2024). This includes stress testing for temperature cycling, high-temperature reverse bias, and mechanical shock-validating its use in automotive powertrain and body control modules.
How does the SMB package of SM6T68AHM3/H compare thermally to SMA or SMC packages?
SM6T68AHM3/H in SMB (DO-214AA) package has a typical RθJA of 100 °C/W, which is 40 °C/W better than SMA (140 °C/W) and 20 °C/W worse than SMC (80 °C/W). This makes SMB the optimal balance of compact size and thermal performance for mid-power transient suppression where board space and heat dissipation must both be managed.
SM6T68AHM3/H 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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T68AHM3/H FAQ
1.How can I place an order for SM6T68AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHM3/H 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 SM6T68AHM3/H reliable?
The price and inventory of SM6T68AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68AHM3/H is usually 5 days.
3.What payment methods are accepted for SM6T68AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHM3/H?
SM6T68AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHM3/H 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 SM6T68AHM3/H?
For technical support, including SM6T68AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHM3/H requirements.
6.How does Aetrix verify that SM6T68AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM6T68AHM3/H 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 SM6T68AHM3/H meets industry standards.
7.What is the process for return or replacement of SM6T68AHM3/H?
All SM6T68AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHM3/H, 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 SM6T68AHM3/H part is unused and in its original packaging.
Return procedure for SM6T68AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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