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Vishay General Semiconductor - Diodes Division 1.5SMC6.8A-M3/9AT
- Part No.:
- 1.5SMC6.8A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC6.8A-M3/9AT.pdf
- Description:
- TVS DIODE 5.8VWM 10.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,095
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Product details
Overview
1.5SMC6.8A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary-level overvoltage protection in power rails and signal lines. It features a 6.8 V breakdown voltage (VBR = 6.45–7.14 V at IT = 10 mA), 5.8 V stand-off voltage (VWM), 10.5 V clamping voltage (VC) at 143 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial DC power inputs.
For engineers reviewing the 1.5SMC6.8A-M3/9AT datasheet, 1.5SMC6.8A-M3/9AT pinout, 1.5SMC6.8A-M3/9AT application, or 1.5SMC6.8A-M3/9AT equivalent, this page delivers verified electrical parameters, SMC (DO-214AB) package details, clamping performance under surge conditions, thermal derating behavior, and AEC-Q101-compliant halogen-free alternatives for automotive-grade design-in.
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation (blocking up to 5.8 V), then avalanche-conducting within nanoseconds when transient voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown and low leakage (<1000 µA at VWM), while the SMC package supports automated placement and meets MSL Level 1 reflow requirements (260 °C peak).
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling reliable operation up to TJ = +150 °C. The device sustains 200 A non-repetitive forward surge (8.3 ms half-sine) and exhibits +0.057 %/°C VBR temperature coefficient - critical for precision rail protection across temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 6.45 V / 7.14 V at 10 mA - defines precise avalanche initiation window for repeatable clamping threshold |
| VWM | 5.8 V - maximum continuous reverse voltage before leakage rises; sets safe operating margin below VBR |
| VC @ IPPM | 10.5 V at 143 A - clamped voltage during 1500 W transient; determines protected circuit's maximum stress level |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity; validates suitability for lightning/inductive-switching events |
| IFSM | 200 A (8.3 ms half-sine) - forward surge rating confirms robustness against accidental polarity reversal or inrush |
| TJ max. | +150 °C - junction temperature limit enabling use in under-hood automotive or high-ambient industrial environments |
| Package | SMC (DO-214AB) - standardized surface-mount outline with cathode band marking; compatible with IPC-7351B footprint |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant (260 °C peak reflow). Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal during normal operation | Connected to protected line (e.g., +12 V rail); conducts during overvoltage to shunt current to ground |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path during transients |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Validates immunity to IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without degradation |
| Clamping ratio VC/VBR ≈ 1.55 | Ensures low overvoltage overshoot during fast transients - critical for safeguarding 5 V/3.3 V logic interfaces |
| Low incremental surge resistance | Minimizes VC rise under high di/dt events, preserving clamping accuracy during multi-kA pulses |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive and industrial environmental compliance mandates without compromising surge performance |
| AEC-Q101 qualified variant available | Enables drop-in qualification path for automotive applications requiring stress-tested reliability (e.g., HE3/HM3 suffixes) |
Applications
| Automotive Sensor Interface Protection | Industrial DC Power Input Clamping |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground, clamping positive-going spikes before they reach downstream regulators or signal conditioners. Use Value: Limits rail voltage to ≤10.5 V during 143 A surges, preventing latch-up or permanent damage to 5 V tolerant ICs per ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguarding 24 V PLC I/O modules and motor drive control boards against inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC input, coordinated with upstream fuses and secondary filtering to absorb repetitive switching surges. Use Value: Withstands 1500 W pulses without parameter shift, maintaining VWM = 5.8 V integrity to avoid false triggering during nominal operation. |
| Consumer USB Power Delivery Line | Telecom Base Station DC Feeds |
Use Scenario: Secondary protection on USB-C VBUS lines after primary fuse, guarding against ESD and hot-plug overshoot in portable docking stations. IC Role / Device Role / Timing Role: Fast-response TVS (nanosecond turn-on) placed adjacent to connector, shunting transients before reaching USB PD controller ICs. Use Value: Achieves <100 ns response time and clamps to 10.5 V, ensuring compliance with USB PD 3.1 voltage tolerance limits (±10%) during fault conditions. |
Use Scenario: Front-end surge suppression on -48 V telecom rectifier outputs feeding remote radio units and optical line terminals. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to negative rail, absorbing lightning-induced common-mode surges coupled onto DC distribution lines. Use Value: Rated for 200 A 8.3 ms forward surge, enabling survival of multiple telecom-grade lightning strikes (IEC 61000-4-5) without parametric drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A-M3/86A | Lower PPPM (600 W), same VBR range, SMB package (smaller footprint, higher RθJA) | Better suited for space-constrained consumer PCBs where 600 W surge margin suffices | Select when board area is limited and full 1500 W rating is unnecessary; verify thermal margin with RθJA = 110 °C/W |
| 1.5SMC6.8AHE3_A/I | Identical electrical specs; AEC-Q101 qualified, RoHS-compliant, 13" tape (I suffix), revision A | Required for automotive production programs needing PPAP documentation and stress-tested reliability | Choose for Tier 1 automotive designs where qualification traceability and extended temperature cycling validation are mandatory |
Compared with 1.5SMC6.8A-M3/9AT, SMBJ6.8A-M3/86A trades surge capacity for compactness, while 1.5SMC6.8AHE3_A/I adds automotive qualification without altering clamping behavior - enabling direct substitution only when AEC-Q101 compliance is required.
Availability
1.5SMC6.8A-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial DC input clamping, consumer USB power delivery, and telecom base station DC feeds requiring stable component supply, halogen-free compliance, and 13-inch tape-and-reel logistics.
Supply support for 1.5SMC6.8A-M3/9AT 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 application-specific optimization.
The 1.5SMC Series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for robust clamping, low leakage, and seamless integration into automated SMT assembly lines.
FAQ
What is the clamping voltage of the 1.5SMC6.8A-M3/9AT under maximum surge conditions?
The 1.5SMC6.8A-M3/9AT clamps to 10.5 V at its rated peak pulse current of 143 A (10/1000 µs waveform). This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines. The clamping voltage remains stable across its operational temperature range and is critical for determining the maximum overvoltage stress imposed on downstream components during transient events.
Is the 1.5SMC6.8A-M3/9AT suitable for automotive applications?
The 1.5SMC6.8A-M3/9AT itself is halogen-free and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the functionally identical 1.5SMC6.8AHE3_A/I and 1.5SMC6.8AHM3_A/I variants that are fully AEC-Q101 qualified and share the same electrical characteristics, including VBR, VC, and PPPM. For production automotive use, those qualified variants are required; the 1.5SMC6.8A-M3/9AT serves well in industrial and consumer prototyping where qualification is not mandated.
How does the 1.5SMC6.8A-M3/9AT differ from bidirectional TVS diodes like 1.5SMC6.8CA-M3/9AT?
The 1.5SMC6.8A-M3/9AT is unidirectional and functions only in reverse bias - it blocks up to 5.8 V in the forward direction and clamps above VBR in reverse. In contrast, 1.5SMC6.8CA-M3/9AT is bidirectional, providing symmetrical clamping for AC-coupled or floating lines (e.g., data buses), with identical VBR in both directions. The unidirectional version offers lower leakage and slightly tighter VBR tolerance, making it preferred for DC rail protection where polarity is fixed.
What is the thermal resistance and how does it affect layout for the 1.5SMC6.8A-M3/9AT?
The 1.5SMC6.8A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under sustained 6.5 W power dissipation, PCB layout must allocate sufficient copper area and consider airflow. Reducing pad size increases RθJA, risking thermal runaway during repetitive surges - so adherence to Vishay's mounting recommendations is essential for reliability.
Can the 1.5SMC6.8A-M3/9AT be used in place of older P6KE6.8A through-hole TVS diodes?
Yes - the 1.5SMC6.8A-M3/9AT provides equivalent electrical performance (VBR, VC, PPPM) in a surface-mount SMC (DO-214AB) package, replacing through-hole P6KE6.8A in new designs. Key advantages include automated assembly compatibility, smaller footprint, and improved high-frequency response due to lower parasitic inductance. However, mechanical mounting and thermal path differ significantly: the 1.5SMC6.8A-M3/9AT requires optimized PCB copper pads instead of lead-frame heatsinking, so thermal validation is necessary during redesign.
1.5SMC6.8A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.8V
- Voltage - Breakdown (Min):
- 6.45V
- Voltage - Clamping (Max) @ Ipp:
- 10.5V
- Current - Peak Pulse (10/1000µs):
- 143A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC6.8A-M3/9AT FAQ
1.How can I place an order for 1.5SMC6.8A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC6.8A-M3/9AT 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 1.5SMC6.8A-M3/9AT reliable?
The price and inventory of 1.5SMC6.8A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC6.8A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC6.8A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC6.8A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC6.8A-M3/9AT?
1.5SMC6.8A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC6.8A-M3/9AT 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 1.5SMC6.8A-M3/9AT?
For technical support, including 1.5SMC6.8A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC6.8A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC6.8A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC6.8A-M3/9AT 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 1.5SMC6.8A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC6.8A-M3/9AT?
All 1.5SMC6.8A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC6.8A-M3/9AT, 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 1.5SMC6.8A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC6.8A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC6.8A-M3/9AT Tags
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