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Vishay General Semiconductor - Diodes Division SM6T68CAHM3/H
- Part No.:
- SM6T68CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CAHM3/H.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,001
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Product details
Overview
SM6T68CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 68 V breakdown voltage (VBR = 64.6–71.4 V), 58.1 V stand-off voltage (VWM), 92.0 V max clamping voltage at 6.5 A (10/1000 μs), 600 W peak pulse power, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T68CAHM3/H datasheet, SM6T68CAHM3/H pinout, SM6T68CAHM3/H application, or SM6T68CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.34), halogen-free RoHS-compliant construction, MSL Level 1 rating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix designation, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM), while low inductance supports fast transient response under 10/1000 μs surges.
The device is rated for TJ = –65 °C to +150 °C and derates linearly above 25 °C ambient, with RθJA = 100 °C/W and RθJL = 20 °C/W. Mounting on minimum recommended 0.2" × 0.2" copper pads is required to sustain full 600 W PPPM rating per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - Ensures reliable turn-on before downstream IC damage; tested at 1 mA IT |
| VWM | 58.1 V - Maximum continuous reverse voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V @ 6.5 A (10/1000 μs) - Clamping level limiting stress on protected circuitry |
| PPPM | 600 W - Peak surge energy absorption capacity under standard lightning waveform |
| TJ range | –65 °C to +150 °C - Supports operation in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with IPC-7351B standard land pattern |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements (HTOL, TC, HAST, etc.) |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common terminal in bidirectional mode | No polarity marking; symmetrical conduction enables AC line protection without orientation constraints |
| Cathode | Current exit point in forward bias; common terminal in bidirectional mode | No band or marking - distinguishes it from unidirectional variants (e.g., SM6T68A); terminals are functionally interchangeable |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of differential buses (e.g., CAN, RS-485) without external polarity management |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) when mounted per recommended pad layout |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-20 and EU Directive 2011/65/EU Annex II |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage exposure during transient events compared to higher-ratio alternatives |
| Automated placement optimized | Flat, low-profile SMB package supports high-speed pick-and-place with >99.9% placement yield |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs from load dump and ISO 7637-2 pulses in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential sensor output lines to clamp ±100 V transients within 1 ns. Use Value: Prevents latch-up or gate oxide rupture in downstream op-amps and ADCs while maintaining signal integrity below 58.1 V operating window. | Use Scenario: Guarding RS-485/CAN FD transceivers against ESD (IEC 61000-4-2 ±15 kV) and surge (IEC 61000-4-5) in factory automation nodes. IC Role / Device Role / Timing Role: Low-inductance shunt device absorbing transient energy before it reaches transceiver pins. Use Value: Enables robust communication up to 5 Mbps without signal distortion, validated per AEC-Q101 HTOL and temperature cycling. |
| Consumer USB Type-C Port | Telecom DSL Line Interface |
Use Scenario: Safeguarding USB Type-C CC and SBU lines from hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp integrated into port-level ESD protection array. Use Value: Meets USB-IF ESD immunity requirements with <1 μA leakage at 5 V, preserving battery life in portable devices. | Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of transformer-coupled analog front-end. Use Value: Sustains 600 W surge without degradation after 1000+ 10/1000 μs events, verified per Telcordia GR-1089-CORE. |
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 (DO-214AC), larger footprint | Less suitable for space-constrained automotive modules requiring SMB density | Select SMAJ68CA only if board area allows larger package and 400 W rating suffices for system-level surge testing. |
| 1.5KE68CA | Higher PPPM = 1500 W, axial leaded DO-201 package; slower response due to higher parasitic inductance | Not suitable for high-speed data lines or automated SMT assembly; requires through-hole mounting | Choose 1.5KE68CA only for legacy through-hole designs where PCB real estate and manual assembly are acceptable. |
Compared with SMAJ68CA and 1.5KE68CA, SM6T68CAHM3/H delivers optimal balance of 600 W surge handling, SMB footprint density, AEC-Q101 qualification, and bidirectional symmetry-making it the preferred choice for modern automotive and industrial SMT designs requiring reliability and miniaturization.
Availability
SM6T68CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB Type-C ports, and telecom DSL line protection requiring stable component supply and long-term lifecycle support.
Supply support for SM6T68CAHM3/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 automotive-grade validation.
The SM6T Series is engineered specifically for surface-mount transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and consistent bidirectional performance are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T68CAHM3/H?
The "CA" suffix in SM6T68CAHM3/H denotes a bidirectional configuration, meaning the device clamps voltage transients equally in both polarities. Unlike unidirectional variants (e.g., SM6T68A), SM6T68CAHM3/H has no cathode marking and functions identically across anode-to-cathode and cathode-to-anode orientations-critical for protecting AC-coupled or differential signal paths such as CAN or RS-485 without polarity concerns.
Is SM6T68CAHM3/H qualified for automotive applications?
Yes, SM6T68CAHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Doc. #88385, Rev. 09-Jan-2024). This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress testing (uHAST), validating its suitability for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage of SM6T68CAHM3/H and at what current?
The maximum clamping voltage (VC) of SM6T68CAHM3/H is 92.0 V, measured at a peak pulse current (IPPM) of 6.5 A under the standardized 10/1000 μs double-exponential waveform. This value is specified in the Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
How does the SMB (DO-214AA) package of SM6T68CAHM3/H affect thermal performance?
The SMB package of SM6T68CAHM3/H provides RθJA = 100 °C/W (junction-to-ambient) and RθJL = 20 °C/W (junction-to-lead) when mounted on 0.2" × 0.2" copper pads per JEDEC standards. This thermal profile enables sustained 5.0 W power dissipation at 50 °C ambient and supports full 600 W pulse rating only with proper PCB copper area-underscoring the need for adherence to Vishay's recommended pad layout.
Does SM6T68CAHM3/H meet RoHS and halogen-free requirements?
Yes, SM6T68CAHM3/H meets RoHS Directive 2011/65/EU and is halogen-free, as indicated by the "HM3" suffix per Vishay's ordering nomenclature. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and its molding compound satisfies UL 94 V-0 flammability rating-fully aligning with environmental compliance mandates for automotive and industrial end equipment.
SM6T68CAHM3/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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T68CAHM3/H FAQ
1.How can I place an order for SM6T68CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CAHM3/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 SM6T68CAHM3/H reliable?
The price and inventory of SM6T68CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68CAHM3/H is usually 5 days.
3.What payment methods are accepted for SM6T68CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CAHM3/H?
SM6T68CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CAHM3/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 SM6T68CAHM3/H?
For technical support, including SM6T68CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CAHM3/H requirements.
6.How does Aetrix verify that SM6T68CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SM6T68CAHM3/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 SM6T68CAHM3/H meets industry standards.
7.What is the process for return or replacement of SM6T68CAHM3/H?
All SM6T68CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CAHM3/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 SM6T68CAHM3/H part is unused and in its original packaging.
Return procedure for SM6T68CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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