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Vishay General Semiconductor - Diodes Division SM6T68AHM3_A/H
- Part No.:
- SM6T68AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHM3_A/H.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,676
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Product details
Overview
SM6T68AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 58.1 V stand-off voltage (VWM), 64.6–71.4 V breakdown voltage (VBR), and 92.0 V clamping voltage (VC) at 6.5 A peak pulse current - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SM6T68AHM3_A/H datasheet, SM6T68AHM3_A/H pinout, SM6T68AHM3_A/H application, or SM6T68AHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction, low-inductance SMB package, and verified clamping performance under IEC 61000-4-5 surge conditions.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, designed to shunt transient energy away from sensitive downstream components during inductive switching events or lightning-induced surges. Its junction is glass passivated for reliability, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
The SM6T68AHM3_A/H delivers stable clamping across -65 °C to +150 °C operating junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling effective power dissipation in compact PCB layouts without heatsinking under defined pad conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VBR (min/max) | 64.6 V / 71.4 V at 1.0 mA test current - ensures reliable turn-on above normal operating rail |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - defines worst-case voltage seen by protected circuit during surge |
| PPPM | 600 W - peak surge power handling capability under standardized 10/1000 μs waveform |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated placement and reflow assembly |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band on body end; dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane to complete clamping loop |
| Cathode | Transient current input node | Banded terminal; connected to protected line (e.g., power rail or signal trace) to divert surge |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV) surges on 12 V/24 V systems |
| Glass passivated junction | Improves long-term stability and reduces parameter drift under thermal cycling and humidity stress |
| Low inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., <100 ns rise time), preserving clamping accuracy |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensors |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients up to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and chassis ground to limit overvoltage to ≤92 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during 120 V/50 ms load dump events. | Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLC modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on 4–20 mA or 0–10 V signal lines, mounted adjacent to connector. Use Value: Limits transient voltage to <92 V while maintaining sub-1 μA leakage at 58.1 V, preserving signal integrity and ADC accuracy. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Secondary-side surge suppression in AC/DC adapters for smart home devices subjected to conducted surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Standoff-rated TVS on +5 V or +12 V output rails to absorb coupling from primary-side transients. Use Value: Clamps 600 W surges within 1 ns response time, preventing overvoltage shutdown or regulator failure in USB-C PD designs. | Use Scenario: DC feed protection in PoE-powered network switches and base station remote radios exposed to lightning-induced surges on -48 V telecom lines. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, sized for 6.5 A peak pulse current at 92 V clamping. Use Value: Maintains compliance with GR-1089-CORE Level 3 (2 kA, 10/1000 μs) while supporting continuous -48 V operation with <1 μA leakage. |
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-E3/52 | Same SMB package, 64 V VWM, but lower PPPM = 400 W and non-AEC-Q101 qualified | Commercial-grade only; not validated for automotive temperature cycling or HTRB | Select when cost sensitivity outweighs automotive qualification and 600 W surge margin is unnecessary |
| 1.5SMC68A | Higher-power SMC package (7.1 mm × 6.2 mm), same VWM/VC, PPPM = 1500 W | Larger footprint; suited for higher-energy surges where board space permits | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and SMB thermal limits are exceeded |
Compared with SMAJ64A-E3/52, SM6T68AHM3_A/H provides 50 % higher surge power rating and automotive qualification; versus 1.5SMC68A, it offers 40 % smaller PCB area and identical clamping voltage but reduced absolute energy handling - ideal for space-constrained AEC-Q101 designs.
Availability
SM6T68AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer power adapters, and telecom DC feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T68AHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and consistent surge performance are mandatory design requirements.
FAQ
What is the clamping voltage of SM6T68AHM3_A/H and how is it measured?
The SM6T68AHM3_A/H has a maximum clamping voltage (VC) of 92.0 V at 6.5 A peak pulse current using the standardized 10/1000 μs double-exponential waveform. This value is measured per JEDEC standards with the device mounted on 0.2" × 0.2" copper pads, ensuring repeatable thermal conditions. The clamping voltage defines the upper voltage limit imposed on protected circuits during surge events, and SM6T68AHM3_A/H maintains this specification across its full operating temperature range.
Is SM6T68AHM3_A/H suitable for automotive applications?
Yes, SM6T68AHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability validation. It undergoes temperature cycling, highly accelerated life testing (HTRB), and ESD testing per AEC-Q101 requirements. The SM6T68AHM3_A/H is explicitly recommended for engine control units, body electronics, and ADAS sensor protection where sustained operation from -65 °C to +150 °C is required.
What does the "HM3" suffix mean in SM6T68AHM3_A/H?
The "HM3" suffix in SM6T68AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3" or "M3") and confirms compliance with automotive reliability standards, material restrictions (per IPC-1752A), and JEDEC J-STD-020 MSL Level 1 reflow profile (260 °C peak). The "_A/H" indicates packaging in 7" tape-and-reel with revision code A and humidity level H.
How does SM6T68AHM3_A/H compare to bidirectional TVS diodes like SM6T68CA?
SM6T68AHM3_A/H is unidirectional and features a cathode band for polarity-sensitive placement, whereas SM6T68CA is bidirectional with no polarity marking and symmetric clamping in both directions. The SM6T68AHM3_A/H offers lower leakage (<1 μA at 58.1 V) and is preferred for DC power rail protection; SM6T68CA suits AC-coupled or differential signal lines. Both share identical VBR, VC, and PPPM, but only SM6T68AHM3_A/H is AEC-Q101 qualified in HM3 form.
What is the thermal resistance of SM6T68AHM3_A/H and why does it matter?
The SM6T68AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on standard 0.2" × 0.2" copper pads. These values determine how effectively heat from transient power dissipation is transferred away from the silicon junction. Lower RθJL supports short-duration surge handling, while RθJA guides layout decisions - e.g., adding thermal vias or larger copper areas improves sustained power derating for repetitive transients.
SM6T68AHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SM6T68AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHM3_A/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_A/H reliable?
The price and inventory of SM6T68AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SM6T68AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHM3_A/H?
SM6T68AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHM3_A/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_A/H?
For technical support, including SM6T68AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHM3_A/H requirements.
6.How does Aetrix verify that SM6T68AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T68AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SM6T68AHM3_A/H?
All SM6T68AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SM6T68AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68AHM3_A/H Tags
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