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Vishay General Semiconductor - Diodes Division SM6T68AHM3_B/H
- Part No.:
- SM6T68AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHM3_B/H.pdf
- Description:
- 600W,68V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,843
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Product details
Overview
SM6T68AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, rated for 68 V breakdown voltage (VBR = 64.6–71.4 V at 1 mA), 58.1 V stand-off voltage (VWM), and 92.0 V clamping voltage (VC) at 6.5 A peak pulse current under 10/1000 μs waveform. It delivers 600 W peak pulse power and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - designed for automotive sensor line protection against inductive switching transients.
For engineers reviewing the SM6T68AHM3_B/H datasheet, SM6T68AHM3_B/H pinout, SM6T68AHM3_B/H application, or SM6T68AHM3_B/H equivalent, key selection criteria include verified clamping performance at 6.5 A, AEC-Q101 qualification status, SMB package thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown and low leakage (<1 μA at VWM). Its 10/1000 μs pulse response and 92.0 V clamping voltage ensure robust protection of downstream ICs and MOSFETs during fast-rising transients.
The device is thermally optimized for surface-mount use: RθJL = 20 °C/W enables effective heat transfer to PCB leads, while MSL Level 1 rating (peak reflow ≤260 °C) supports lead-free assembly. AEC-Q101 qualification confirms suitability for automotive under-hood and body-control applications requiring extended temperature operation (−65 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise breakdown threshold for reliable overvoltage triggering |
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - clamping voltage limiting stress on protected circuitry |
| PPPM | 600 W - peak transient power handling capacity without failure |
| TJ range | −65 °C to +150 °C - validated junction temperature range for automotive and industrial environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, measured on 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VWM exceeded |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including engine control, ADAS sensors, and body modules |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients from load dump or relay coil de-energization without degradation |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT reflow profiles without moisture-related failure risk |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage overshoot during clamping, reducing stress on downstream silicon |
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 ESD and load-switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy before it reaches sensitive input pins of transceivers or ADC front-ends. Use Value: Prevents latch-up or permanent damage in AEC-Q100 qualified ICs while maintaining signal integrity below 58.1 V operating threshold. |
Use Scenario: Safeguarding digital input/output terminals of programmable logic controllers exposed to inductive field-device transients (e.g., solenoid valves, motor starters). IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry point to divert >600 W surges away from isolation barriers and microcontrollers. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (4 kV surge) without additional filtering or derating. |
| Consumer Power Adapter Input | Telecom Line Interface Protection |
Use Scenario: Secondary-side DC bus protection in USB-C PD adapters and AC/DC converters subject to capacitor discharge and hot-plug events. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 100 ns–1 ms transients on 5–20 V rails upstream of DC-DC regulators. Use Value: Maintains <1 μA leakage at 58.1 V to avoid quiescent current penalty while clamping to 92.0 V within 1 ns response time. |
Use Scenario: Overvoltage protection on Ethernet PHY interfaces and POTS line drivers subjected to lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary-stage unidirectional suppressor on tip/ring lines, coordinated with gas discharge tubes for staged protection. Use Value: Provides precise 68 V trigger point aligned with telecom equipment SELV limits and withstands repeated 6.5 A pulses per ITU-T K.21. |
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 lower PPPM = 400 W; SMA package (DO-214AC), higher RθJA = 125 °C/W | Limited to lower-energy transients; not AEC-Q101 qualified; unsuitable for under-hood automotive use | Select when cost or board space is prioritized over automotive qualification and 600 W capability |
| 1.5SMC68A | Same VBR, PPPM = 1500 W, but larger SMC (DO-214AB) package; non-AEC-Q101; higher VC = 112 V | Better energy handling but slower response due to higher junction capacitance; requires larger PCB footprint | Choose for industrial power supplies needing higher surge margin where space permits and AEC-Q101 is unnecessary |
Compared with SMAJ68A-E3/52 and 1.5SMC68A, SM6T68AHM3_B/H uniquely combines AEC-Q101 qualification, 600 W capability in compact SMB, and 92.0 V clamping - making it optimal for space-constrained, high-reliability automotive and industrial edge nodes where thermal and qualification requirements are stringent.
Availability
SM6T68AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SM6T68AHM3_B/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SM6T Series was developed to deliver high-power, AEC-Q101 qualified transient suppression in compact SMB packages for automotive and industrial electronics where space, thermal performance, and qualification rigor are critical.
FAQ
What is the clamping voltage of the SM6T68AHM3_B/H under standard test conditions?
The SM6T68AHM3_B/H has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000 μs waveform at a peak pulse current (IPPM) of 6.5 A. This value is measured per JEDEC standards and ensures predictable overvoltage limiting for protected circuits. The SM6T68AHM3_B/H maintains this clamping performance across its full operating temperature range of −65 °C to +150 °C.
Is the SM6T68AHM3_B/H qualified for automotive applications?
Yes, the SM6T68AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88385. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life - validating its use in automotive powertrain, chassis, and body electronics. The SM6T68AHM3_B/H meets these requirements while retaining halogen-free and RoHS-compliant construction.
What package type does the SM6T68AHM3_B/H use, and what are its mounting requirements?
The SM6T68AHM3_B/H uses the SMB (DO-214AA) surface-mount package with matte tin-plated leads. It requires mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated thermal performance (RθJA = 100 °C/W). The SM6T68AHM3_B/H is MSL Level 1 rated, supporting peak reflow temperatures up to 260 °C in lead-free processes without preconditioning.
How does the SM6T68AHM3_B/H differ from bidirectional TVS diodes in the same series?
The SM6T68AHM3_B/H is unidirectional, with polarity marked by a cathode band and specified parameters (VBR, VWM, VC) applying only in reverse bias. Bidirectional variants (e.g., SM6T68CA) omit the band, have symmetric characteristics in both directions, and are used where AC or bipolar transients occur. The SM6T68AHM3_B/H is not interchangeable with bidirectional types without circuit redesign due to polarity dependency and different leakage behavior.
What is the maximum reverse leakage current for the SM6T68AHM3_B/H at its stand-off voltage?
The SM6T68AHM3_B/H exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 58.1 V, measured at 25 °C. This low leakage preserves system efficiency in battery-powered or low-quiescent-current applications. The SM6T68AHM3_B/H maintains leakage below 10 μA up to 85 °C, per Vishay's thermal derating curves in datasheet 88385.
SM6T68AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- 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:
- Telecom
- 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_B/H FAQ
1.How can I place an order for SM6T68AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHM3_B/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_B/H reliable?
The price and inventory of SM6T68AHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SM6T68AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHM3_B/H?
SM6T68AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHM3_B/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_B/H?
For technical support, including SM6T68AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHM3_B/H requirements.
6.How does Aetrix verify that SM6T68AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T68AHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SM6T68AHM3_B/H?
All SM6T68AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SM6T68AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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