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Vishay General Semiconductor - Diodes Division SM6T68CAHM3_B/I
- Part No.:
- SM6T68CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CAHM3_B/I.pdf
- Description:
- 600W,68V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,625
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Product details
Overview
SM6T68CAHM3_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 at 1 mA), 600 W peak pulse power (10/1000 μs), 92 V maximum clamping voltage at 6.5 A, and −65 °C to +150 °C operating junction temperature. It protects signal lines and power rails in automotive sensor units against ESD and inductive switching transients.
For engineers reviewing the SM6T68CAHM3_B/I datasheet, SM6T68CAHM3_B/I pinout, SM6T68CAHM3_B/I application, or SM6T68CAHM3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low-inductance SMB package, and verified 600 W surge handling per JEDEC-standard waveform.
Technical Context
This TVS diode operates symmetrically in both polarities due to its bidirectional construction, enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 58.1 V stand-off).
The device is thermally optimized for surface-mount applications with RθJA = 100 °C/W and RθJL = 20 °C/W, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is qualified to AEC-Q101 for automotive under-hood and body electronics use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines precise clamping onset threshold for bidirectional overvoltage events |
| VWM | 58.1 V - maximum continuous reverse working voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - actual clamped voltage during 600 W surge, critical for downstream IC survival |
| PPPM | 600 W - peak pulse power rating per standard 10/1000 μs waveform, validated for repetitive surge immunity |
| TJ range | −65 °C to +150 °C - enables deployment in automotive engine compartments and industrial control enclosures |
| Package | SMB (DO-214AA) - low-profile, automated-placement compatible case with 5.59 mm × 4.06 mm footprint |
| AEC-Q101 | Qualified - certified for automotive reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
Pinout & Package
SMB (DO-214AA) package: surface-mount, bidirectional device with no polarity marking; symmetrical terminals suitable for AC line or differential pair protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | One terminal of bidirectional PN junction | Electrically identical to cathode; interchangeable in layout - no polarity dependency |
| Cathode | Other terminal of bidirectional PN junction | Functionally redundant label; both pins serve as symmetrical surge conduction paths |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, or CAN FD differential pairs without external polarity management |
| 600 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 4 surges when mounted on recommended 5.0 mm × 5.0 mm copper pads |
| AEC-Q101 qualification | Validated for automotive-grade lifetime performance including 1000-cycle temperature cycling and 1000-hour high-temp reverse bias stress |
| Halogen-free & RoHS | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-208 material restrictions for green manufacturing compliance |
| Low-inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., ESD > 30 kV contact discharge) due to sub-1 nH parasitic inductance |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor outputs exposed to load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential signal pair upstream of signal conditioner IC. Use Value: Clamps transients to ≤92 V while maintaining <1 μA leakage at 58.1 V, preserving signal integrity and preventing false triggering. | Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation PLCs subject to cable-induced lightning surges. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground TVS on A/B bus lines, leveraging symmetrical clamping to suppress common-mode and differential-mode spikes. Use Value: 600 W rating handles 4 kV IEC 61000-4-5 surges; SMB footprint allows placement within 5 mm of connector without trace inductance penalty. |
| Consumer USB-C ESD Protection | Telecom DSL Line Interface |
Use Scenario: Secondary-level ESD protection on USB-C CC and SBU lines in portable docking stations. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp between data line and chassis ground, coordinated with primary polymer-based TVS. Use Value: Sub-1 ns response time and 92 V clamping prevent latch-up in USB PD controllers during ±8 kV HBM ESD events. | Use Scenario: Overvoltage protection on POTS line interface circuits in DSLAM line cards exposed to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Primary surge suppression device across tip/ring pair, rated for repeated 600 W pulses per GR-1089-CORE requirements. Use Value: AEC-Q101 qualification ensures long-term reliability under thermal cycling in telecom central office environments (−5 °C to +55 °C ambient). |
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) and PPPM (600 W), but SMA package (larger footprint, higher RθJA = 130 °C/W) | Less suitable for dense automotive PCBs; requires larger pad area and exhibits slower thermal recovery | Select SMAJ68CA only if legacy layout uses SMA or thermal margin exceeds 20 °C above SM6T68CAHM3_B/I |
| 1.5KE68CA | Higher PPPM (1500 W), DO-201 package (axial leaded), VBR 64.6–71.4 V, but not AEC-Q101 qualified and incompatible with SMT assembly | Restricted to through-hole prototyping or non-automotive industrial designs where manual assembly is acceptable | Choose 1.5KE68CA only for cost-sensitive, non-automotive applications requiring higher surge headroom and no SMT constraint |
Compared with SMAJ68CA and 1.5KE68CA, SM6T68CAHM3_B/I delivers superior board-space efficiency, automotive-grade reliability, and lower thermal resistance in an SMT-optimized SMB package-making it the preferred choice for volume automotive and industrial designs requiring AEC-Q101 compliance and automated manufacturing.
Availability
SM6T68CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, and telecom line interface circuits requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SM6T68CAHM3_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, automotive-qualified components.
The SM6T Series is designed specifically for robust transient suppression in space-constrained, high-reliability applications-including automotive ECUs, industrial communication interfaces, and consumer power adapters-where bidirectional clamping, AEC-Q101 validation, and low-inductance packaging are mandatory.
FAQ
What is the exact breakdown voltage range for SM6T68CAHM3_B/I?
The SM6T68CAHM3_B/I has a guaranteed breakdown voltage (VBR) range of 64.6 V to 71.4 V at a test current of 1 mA, as specified in the Vishay SM6T datasheet revision 09-Jan-2024. This tolerance reflects the bidirectional nature of the device and ensures consistent clamping behavior across both polarities. The SM6T68CAHM3_B/I maintains this specification under standard test conditions (TA = 25 °C) and is validated across its full operating temperature range.
Is SM6T68CAHM3_B/I suitable for automotive applications?
Yes, SM6T68CAHM3_B/I is AEC-Q101 qualified and explicitly designated for automotive use, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified) and underscored "B/I" tape-and-reel packaging code. It undergoes full stress testing per AEC-Q101 including HTGB, TC, and AC-H3TRB. The SM6T68CAHM3_B/I is deployed in engine control units, ADAS sensor interfaces, and body electronics where transient immunity and long-term reliability are critical.
What does the "CA" suffix mean in SM6T68CAHM3_B/I?
The "CA" suffix in SM6T68CAHM3_B/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions, unlike unidirectional "A" variants. This makes the SM6T68CAHM3_B/I ideal for protecting AC-coupled lines, differential buses (e.g., CAN, RS-485), or any circuit where polarity reversal may occur. The CA designation is standardized across the SM6T family per Vishay documentation.
What is the maximum clamping voltage of SM6T68CAHM3_B/I during a surge event?
The SM6T68CAHM3_B/I has a maximum clamping voltage (VC) of 92.0 V at a peak pulse current (IPPM) of 6.5 A, tested with the industry-standard 10/1000 μs waveform. This value represents the highest voltage seen across the device during a 600 W transient event and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The SM6T68CAHM3_B/I achieves this clamping performance while maintaining low leakage (<1 μA) at its 58.1 V stand-off voltage.
Does SM6T68CAHM3_B/I require special PCB layout considerations?
Yes - for optimal surge performance, SM6T68CAHM3_B/I must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, as specified in the Vishay datasheet. Short, wide traces to the protected node and direct grounding minimize inductance and prevent voltage overshoot. The SM6T68CAHM3_B/I's low-inductance SMB package is ineffective without proper layout; inadequate copper area degrades its 600 W rating and increases clamping voltage beyond 92 V.
SM6T68CAHM3_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)
SM6T68CAHM3_B/I FAQ
1.How can I place an order for SM6T68CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CAHM3_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 SM6T68CAHM3_B/I reliable?
The price and inventory of SM6T68CAHM3_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 SM6T68CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T68CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CAHM3_B/I?
SM6T68CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CAHM3_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 SM6T68CAHM3_B/I?
For technical support, including SM6T68CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CAHM3_B/I requirements.
6.How does Aetrix verify that SM6T68CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T68CAHM3_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 SM6T68CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T68CAHM3_B/I?
All SM6T68CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CAHM3_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 SM6T68CAHM3_B/I part is unused and in its original packaging.
Return procedure for SM6T68CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CAHM3_B/I Tags
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