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Vishay General Semiconductor - Diodes Division SM6T68AHE3_A/I
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- Part No.:
- SM6T68AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHE3_A/I.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,551
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Product details
Overview
SM6T68AHE3_A/I 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), and 92.0 V maximum clamping voltage (VC) at 6.5 A peak pulse current - used to protect automotive sensor signal lines against inductive switching transients.
For engineers reviewing the SM6T68AHE3_A/I datasheet, SM6T68AHE3_A/I pinout, SM6T68AHE3_A/I application, or SM6T68AHE3_A/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 100 °C/W) for PCB layout validation.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds 64.6 V (min VBR), it avalanches to divert surge current away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at VWM).
Designed for surface-mount automated assembly, it meets MSL level 1 (260 °C reflow peak) and supports automotive-grade reliability via AEC-Q101 qualification - confirmed by HE3 suffix and ordering code SM6T68AHE3_A/I.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 64.6 V / 71.4 V at 1.0 mA - precise breakdown threshold defining turn-on sensitivity |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - clamping voltage limiting stress on protected circuitry |
| PPPM | 600 W - peak surge power handling capability per standard waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by black band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (unidirectional) | Connected to ground or low-side reference; completes clamping path during reverse surge |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line; avalanche conduction initiates here when VWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges in automotive ECUs |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive use including engine control, ADAS sensors, and infotainment power rails |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, with <1 μA leakage at VWM |
| Low inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., ESD, load dump edge rates) |
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 inductive load switching in vehicle body control modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS clamping reverse transients before they reach the input stage of signal-conditioning amplifiers or transceivers. Use Value: Limits clamping voltage to 92.0 V while absorbing 600 W surges, preventing latch-up or gate oxide damage in downstream ASICs. | Use Scenario: Safeguarding digital input terminals of programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed between field wiring and optocoupler input, referenced to system ground. Use Value: Withstands repetitive 100 A IFSM surges and maintains <1 μA leakage at 58.1 V, ensuring long-term signal integrity without false triggering. |
| Power Supply Rail Clamp | Consumer Device USB Port Protection |
Use Scenario: Secondary overvoltage protection on 48 V DC-DC converter outputs powering auxiliary systems in commercial vehicles. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary regulation to catch residual transients escaping upstream filtering. Use Value: Clamps to 92.0 V within nanoseconds, limiting energy delivered to downstream LDOs and microcontrollers during load dump events. | Use Scenario: Reverse-polarity and ESD protection on USB VBUS lines in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-VBUS, blocking reverse connection while clamping ESD pulses. Use Value: Meets IEC 61000-4-2 Level 4 (±15 kV air) due to low clamping voltage and sub-nanosecond response, preserving USB enumeration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A-E3/5B | Same SMB package, 64 V VWM, but lower PPPM = 400 W and no AEC-Q101 qualification | Rated for commercial/industrial use only; not validated for automotive temperature cycling or humidity testing | Select when cost sensitivity outweighs automotive qualification requirements and surge energy is ≤400 W |
| 1.5SMC68A | Higher PPPM = 1500 W, SMC (DO-214AB) package (larger footprint), VWM = 58.1 V identical | Requires larger PCB area and different pad layout; suited for higher-energy industrial surge standards (IEC 61000-4-5) | Choose when system-level testing requires >600 W surge margin or legacy SMC footprint compatibility is mandatory |
Compared with SMAJ64A-E3/5B and 1.5SMC68A, SM6T68AHE3_A/I uniquely balances AEC-Q101 compliance, SMB footprint constraints, and 600 W clamping performance - making it optimal for space-constrained automotive modules where qualification and reliability are non-negotiable.
Availability
SM6T68AHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and DC-DC converter rail clamping requiring stable component supply across production lifecycles.
Supply support for SM6T68AHE3_A/I 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 and high-volume manufacturability.
The SM6T Series is engineered specifically for transient overvoltage protection in automotive and industrial environments, combining AEC-Q101 qualification, robust 600 W surge handling, and compact SMB packaging for signal-line and power-rail safeguarding.
FAQ
What is the clamping voltage of SM6T68AHE3_A/I at its rated peak pulse current?
The SM6T68AHE3_A/I has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 6.5 A. This value is measured per Figure 1 in the Vishay datasheet 88385 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6T68AHE3_A/I maintains this clamping performance across its qualified operating temperature range.
Is SM6T68AHE3_A/I qualified for automotive applications?
Yes, SM6T68AHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its part number and explicit listing in Vishay's ordering information table. This qualification covers temperature cycling, humidity testing, and mechanical shock validation required for under-hood and cabin-mounted automotive electronics. The SM6T68AHE3_A/I is intended for use in automotive sensor units, body control modules, and infotainment power supplies.
What does the "A/I" suffix mean in SM6T68AHE3_A/I?
The "A/I" suffix in SM6T68AHE3_A/I indicates the packaging configuration: "A" denotes the revision code (per Vishay's documentation), and "I" specifies 13-inch diameter plastic tape and reel delivery containing 3200 units. This matches the preferred package code "I" listed in the Ordering Information section of datasheet 88385. The SM6T68AHE3_A/I is RoHS-compliant and AEC-Q101 qualified per base P/NHE3_X conventions.
How does SM6T68AHE3_A/I differ from bidirectional TVS diodes like SM6T68CA?
SM6T68AHE3_A/I is unidirectional, with polarity marked by a cathode band and designed to clamp only reverse-voltage transients - forward conduction is permitted up to 100 A surge. In contrast, SM6T68CA is bidirectional, symmetrical in both directions, and lacks polarity marking. The SM6T68AHE3_A/I is selected when protection is needed only on one side of a DC rail (e.g., VBUS to ground), whereas SM6T68CA suits AC-coupled or dual-polarity signal lines.
What is the thermal resistance of SM6T68AHE3_A/I, and how does it affect layout?
The SM6T68AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal. This value guides PCB copper pour sizing: reducing RθJA requires increasing pad area or adding thermal vias. For automotive applications operating near +125 °C ambient, derating curves in Figure 2 of datasheet 88385 must be applied to ensure SM6T68AHE3_A/I stays within its 150 °C TJ limit.
SM6T68AHE3_A/I 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 (SMBJ)
SM6T68AHE3_A/I FAQ
1.How can I place an order for SM6T68AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHE3_A/I 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 SM6T68AHE3_A/I reliable?
The price and inventory of SM6T68AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T68AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHE3_A/I?
SM6T68AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHE3_A/I 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 SM6T68AHE3_A/I?
For technical support, including SM6T68AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHE3_A/I requirements.
6.How does Aetrix verify that SM6T68AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T68AHE3_A/I 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 SM6T68AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T68AHE3_A/I?
All SM6T68AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHE3_A/I, 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 SM6T68AHE3_A/I part is unused and in its original packaging.
Return procedure for SM6T68AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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