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Vishay General Semiconductor - Diodes Division SM6T68AHE3_B/I
- Part No.:
- SM6T68AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHE3_B/I.pdf
- Description:
- 600W,68V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
SM6T68AHE3_B/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), 64.6–71.4 V breakdown voltage (VBR), 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_B/I datasheet, SM6T68AHE3_B/I pinout, SM6T68AHE3_B/I application, or SM6T68AHE3_B/I equivalent, key selection criteria include clamping performance under 10/1000 μs surge, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and SMB package compatibility with automated SMT placement.
Technical Context
This TVS diode operates as a unidirectional overvoltage clamp, leveraging an avalanche breakdown mechanism to divert transient energy away from downstream ICs or MOSFETs. Its low-inductance SMB package and glass-passivated junction support fast response (<1 ns) and stable clamping across temperature.
Designed for automotive-grade reliability, SM6T68AHE3_B/I meets AEC-Q101 qualification, features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is rated for operation from −65 °C to +150 °C junction temperature with MSL Level 1 moisture sensitivity.
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 - defines reliable avalanche initiation range |
| 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 10/1000 μs waveform |
| TJ max | +150 °C - enables use in under-hood automotive environments without derating |
| RθJA | 100 °C/W - thermal resistance indicating need for adequate PCB copper area for power dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with molded UL 94 V-0 compound; cathode indicated by band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path during normal bias | Connected to system ground or lower-potential node in unidirectional protection configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., sensor output); band-marked end must align with schematic cathode symbol |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust suppression of ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems |
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD |
| Glass passivated chip junction | Ensures stable VBR and low leakage over lifetime, even under humidity and thermal cycling |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., load dump edge rates >100 V/μs) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load-dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤92.0 V during 6.5 A surges, preventing latch-up or gate oxide damage in downstream 5 V or 3.3 V signal chain components. | Use Scenario: Safeguarding 24 V digital input modules in factory automation controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protector on optocoupler input side, absorbing repetitive 10/1000 μs transients up to 600 W. Use Value: Maintains 58.1 V stand-off while clamping at 92.0 V, ensuring logic-level integrity and eliminating false triggering during industrial EMI events. |
| Automotive CAN Transceiver Protection | Power Supply Rail Clamp |
Use Scenario: Secondary protection on CAN_H/CAN_L lines downstream of common-mode choke, guarding against ESD and battery reversal spikes. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to ground on each CAN line, with cathode tied to line. Use Value: Fast avalanche response (<1 ns) and 92.0 V clamping prevent CAN controller damage during ISO 10605 ESD events up to ±25 kV contact discharge. | Use Scenario: Overvoltage clamp on 48 V auxiliary supply rail feeding ADAS domain controllers. IC Role / Device Role / Timing Role: Standby protection device connected between rail and ground, activated only during overvoltage faults. Use Value: Withstands 100 A non-repetitive forward surge (IFSM) and dissipates 5.0 W continuously, supporting sustained fault conditions without thermal runaway. |
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, 71.1–78.6 V VBR, 103 V VC @ 5.8 A - higher clamping voltage than SM6T68AHE3_B/I | Not AEC-Q101 qualified; commercial grade only | Select when AEC-Q101 is not required and higher clamping margin is acceptable |
| 1.5SMC68A | Higher-power SMC package (1500 W), 68 V VWM, 75.6–83.6 V VBR, 110 V VC @ 13.6 A - larger footprint and different thermal profile | Designed for higher-energy transients; less suitable for space-constrained automotive PCBs | Choose when surge energy exceeds 600 W rating and board layout allows SMC footprint |
Compared with SMAJ64A-E3/52 and 1.5SMC68A, SM6T68AHE3_B/I offers tighter VBR tolerance (±5%), lower clamping voltage (92.0 V vs. ≥103 V), and verified AEC-Q101 qualification - making it optimal for space-limited, safety-critical automotive signal-line protection where precise voltage limiting and automotive compliance are mandatory.
Availability
SM6T68AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O modules, CAN bus protection circuits, and 48 V power rail clamping requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T68AHE3_B/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SM6T Series is engineered for high-reliability transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom systems where AEC-Q101 qualification, low clamping voltage, and consistent surge handling are critical design requirements.
FAQ
What is the clamping voltage of SM6T68AHE3_B/I at its rated peak pulse current?
The SM6T68AHE3_B/I has a maximum clamping voltage (VC) of 92.0 V at 6.5 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC and ensures predictable overvoltage limiting during surge events. The SM6T68AHE3_B/I maintains this clamping performance across its specified operating temperature range and is validated for repeatable behavior in automotive-grade applications.
Is SM6T68AHE3_B/I qualified for automotive applications?
Yes, SM6T68AHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88385. It undergoes rigorous stress testing including high-temperature operating life, temperature cycling, and ESD verification. The SM6T68AHE3_B/I is intended for use in automotive subsystems such as body control modules, sensor interfaces, and infotainment power supplies where reliability under thermal and electrical stress is mandatory.
What does the "_B/I" suffix in SM6T68AHE3_B/I indicate?
The "_B/I" suffix in SM6T68AHE3_B/I denotes packaging configuration: "B" indicates tape-and-reel packaging per Vishay's internal revision coding, and "I" specifies a 13-inch diameter reel containing 3200 units. This format supports high-volume SMT assembly and is compatible with standard pick-and-place equipment. The SM6T68AHE3_B/I retains all electrical and qualification characteristics of the base SM6T68AHE3 part.
How does SM6T68AHE3_B/I differ from bidirectional TVS diodes like SM6T68CA?
SM6T68AHE3_B/I is unidirectional, with polarity marked by a cathode band and designed to clamp only in reverse bias - ideal for DC-biased signal lines. In contrast, SM6T68CA is bidirectional, symmetric in both directions, and used in AC or floating applications like data lines. The SM6T68AHE3_B/I provides lower leakage and tighter VBR tolerance than its bidirectional counterpart, but cannot replace it in non-polarized circuits without redesign.
What is the thermal resistance and recommended PCB layout for SM6T68AHE3_B/I?
The SM6T68AHE3_B/I 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. To maintain safe operation at full 5.0 W steady-state dissipation, designers must provide minimum pad dimensions per Vishay's SMB outline drawing and avoid excessive trace length or narrow traces that increase thermal impedance. The SM6T68AHE3_B/I thermal performance is validated using this pad layout.
SM6T68AHE3_B/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:
- 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)
SM6T68AHE3_B/I FAQ
1.How can I place an order for SM6T68AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHE3_B/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_B/I reliable?
The price and inventory of SM6T68AHE3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SM6T68AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHE3_B/I?
SM6T68AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHE3_B/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_B/I?
For technical support, including SM6T68AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHE3_B/I requirements.
6.How does Aetrix verify that SM6T68AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T68AHE3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SM6T68AHE3_B/I?
All SM6T68AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHE3_B/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_B/I part is unused and in its original packaging.
Return procedure for SM6T68AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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