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Vishay General Semiconductor - Diodes Division SM6T68CAHE3_B/I
- Part No.:
- SM6T68CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CAHE3_B/I.pdf
- Description:
- 600W,68V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,203
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Product details
Overview
SM6T68CAHE3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 68 V breakdown voltage (VBR = 64.6–71.4 V), 600 W peak pulse power (10/1000 μs), and 92 V maximum clamping voltage at 6.5 A. It provides robust ESD and surge protection for automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SM6T68CAHE3_B/I datasheet, SM6T68CAHE3_B/I pinout, SM6T68CAHE3_B/I application, or SM6T68CAHE3_B/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low clamping ratio (1.35×VBR), 150 °C max junction temperature, and compatibility with automated SMT placement on standard SMB footprints.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding its reverse standoff voltage (VWM = 58.1 V), it avalanches symmetrically in both directions to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at VWM).
Designed for high-reliability automotive use, SM6T68CAHE3_B/I meets AEC-Q101 stress testing requirements and is qualified for operation from –65 °C to +150 °C. Its thermal resistance (RθJA = 100 °C/W) and low inductance support fast response to sub-microsecond transients without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - defines precise avalanche onset range under 1 mA test current |
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V @ 6.5 A - clamping voltage during 600 W 10/1000 μs surge, limiting downstream stress |
| PPPM | 600 W - peak transient power handling capability per standardized waveform |
| TJ max. | +150 °C - enables deployment in under-hood automotive environments |
| Package | SMB (DO-214AA) - surface-mount outline with 5.59 mm × 4.06 mm footprint and J-STD-020 MSL level 1 rating |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, and HAST |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction; conducts during positive or negative overvoltage events |
| Cathode | Transient current entry (reverse bias) | Second terminal of symmetrical PN junction; identical function to Anode in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Equal VBR and VC in both polarities enables protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Handles ISO 7637-2 Pulse 1/2a/5a surges and IEC 61000-4-5 Level 4 transients on 12 V/24 V systems |
| AEC-Q101 qualification | Validated for automotive electronics including engine control modules, ADAS sensors, and body controllers |
| Low clamping ratio (1.35×VBR) | Minimizes voltage overshoot during clamping, reducing risk of damage to downstream ICs like CAN transceivers or ADCs |
| MSL Level 1, 260 °C reflow | Supports lead-free soldering without preconditioning, compatible with standard SMT assembly lines |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine bay environments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector interface to divert transients before reaching signal conditioning circuitry. Use Value: Maintains signal integrity by limiting transient voltage to ≤92 V while surviving repeated 600 W pulses per ISO 16750-2. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) modules subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Shunt protector installed between input line and common, clamping fast-rising transients from relay coil switching or ESD events. Use Value: Prevents false triggering and latch-up in optocoupler input stages with <1 μA leakage at 58.1 V operating voltage. |
| Automotive CAN Bus Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-level surge suppression on high-speed CAN FD data lines in infotainment gateways where primary protection resides upstream. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF) bidirectional clamp placed adjacent to CAN transceiver pins to absorb residual transients. Use Value: Ensures signal rise/fall times remain unaffected while providing 92 V clamping margin above 5 V CAN recessive level. | Use Scenario: Protecting microcontroller GPIOs driving brushed DC motors in smart home appliances subjected to commutation spikes. IC Role / Device Role / Timing Role: Fast-response shunt device placed across motor terminals or MCU driver outputs to clamp inductive kickback. Use Value: Eliminates need for external snubbers by absorbing 600 W pulses with no degradation after >1000 surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68CA | Same VBR range (64.6–71.4 V) but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA) | Limited to lower-energy transients (IEC 61000-4-5 Level 3); unsuitable for automotive load dump | Select SMAJ68CA only for space-constrained consumer designs with verified lower surge exposure. |
| 1.5KE68CA | Higher PPPM = 1500 W but axial DO-15 package; slower response due to higher parasitic inductance | Not SMT-compatible; requires through-hole layout; less effective against fast ESD (IEC 61000-4-2) | Choose 1.5KE68CA only for legacy through-hole industrial power supplies where PCB real estate allows. |
Compared with SMAJ68CA and 1.5KE68CA, SM6T68CAHE3_B/I delivers optimal balance of automotive-grade reliability, SMT manufacturability, and 600 W surge capacity in a compact SMB package-making it the preferred choice for new automotive and industrial designs requiring AEC-Q101 compliance and automated assembly.
Availability
SM6T68CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and CAN FD gateway protection requiring stable component supply and long-term lifecycle support.
Supply support for SM6T68CAHE3_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, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade performance.
The SM6T Series is engineered specifically for board-level transient suppression in harsh environments, combining AEC-Q101 qualification, low-inductance SMB packaging, and precise bidirectional clamping for automotive and industrial signal line protection.
FAQ
What does the "CA" suffix indicate in SM6T68CAHE3_B/I?
The "CA" suffix in SM6T68CAHE3_B/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. This is essential for protecting AC-coupled or floating signal lines such as CAN bus, RS-485, or sensor differential pairs where polarity cannot be assumed. Unlike unidirectional variants (e.g., SM6T68A), SM6T68CAHE3_B/I has no cathode marking and identical electrical characteristics in either direction.
Is SM6T68CAHE3_B/I suitable for automotive applications?
Yes, SM6T68CAHE3_B/I is AEC-Q101 qualified and explicitly designed for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validation across temperature cycling, high-temperature operating life, and humidity testing. The device is commonly deployed in engine control units, ADAS camera modules, and body electronics where protection against load dump, jump start, and ISO 7637-2 transients is required.
What is the maximum clamping voltage of SM6T68CAHE3_B/I and how is it measured?
The maximum clamping voltage (VC) of SM6T68CAHE3_B/I is 92.0 V, measured at a peak pulse current (IPPM) of 6.5 A using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during a 600 W transient event and is guaranteed across the full operating temperature range (–65 °C to +150 °C), ensuring consistent protection performance in extreme conditions.
How does the SMB (DO-214AA) package of SM6T68CAHE3_B/I compare to SMA (DO-214AC)?
The SMB package used in SM6T68CAHE3_B/I measures 4.57 mm × 3.94 mm with a 2.20 mm lead width, offering 30% higher power dissipation than the smaller SMA (DO-214AC) package. Its larger copper pad area improves thermal performance (RθJA = 100 °C/W vs. ~125 °C/W for SMA) and supports higher surge repetition rates. The SMB footprint is widely supported in automotive PCB design libraries and aligns with IPC-7351B standards for reliable reflow yield.
What is the significance of the "HE3_B/I" suffix in SM6T68CAHE3_B/I?
The "HE3_B/I" suffix in SM6T68CAHE3_B/I indicates RoHS-compliant, AEC-Q101 qualified construction in 13-inch tape-and-reel packaging (I = 3200 units per reel). "HE3" specifies halogen-free, lead-free matte tin plating meeting JESD201 Class 2 whisker resistance, while "B" denotes revision level and "I" confirms the delivery format. This ordering code ensures traceability, automotive compliance, and compatibility with high-volume SMT assembly lines.
SM6T68CAHE3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T68CAHE3_B/I FAQ
1.How can I place an order for SM6T68CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CAHE3_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 SM6T68CAHE3_B/I reliable?
The price and inventory of SM6T68CAHE3_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 SM6T68CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T68CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CAHE3_B/I?
SM6T68CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CAHE3_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 SM6T68CAHE3_B/I?
For technical support, including SM6T68CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CAHE3_B/I requirements.
6.How does Aetrix verify that SM6T68CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T68CAHE3_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 SM6T68CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T68CAHE3_B/I?
All SM6T68CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CAHE3_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 SM6T68CAHE3_B/I part is unused and in its original packaging.
Return procedure for SM6T68CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CAHE3_B/I Tags
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