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Taiwan Semiconductor Corporation 1.5SMC6.8A
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- Part No.:
- 1.5SMC6.8A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC6.8A.pdf
- Description:
- TVS DIODE 5.8VWM 10.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,187
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Product details
Overview
1.5SMC6.8A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 6.8V nominal breakdown voltage (6.46–7.14V), 1500W peak pulse power rating, 10.5V maximum clamping voltage at 1000A, 5.80V working stand-off voltage, and <1μA leakage current at VWM, making it suitable for protecting USB ports, Ethernet PHYs, and industrial sensor interfaces against ESD and lightning-induced surges.
For engineers reviewing the 1.5SMC6.8A datasheet, 1.5SMC6.8A pinout, 1.5SMC6.8A application, or 1.5SMC6.8A equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, IPPM capability under ISO 7637-2 Pulse 1/2a/2b, thermal resistance (RθJA = 50°C/W), and DO-214AB (SMC) package compatibility with automated SMT assembly.
Technical Context
The 1.5SMC6.8A employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps) and low capacitance, enabling effective suppression of sub-nanosecond ESD events per IEC 61000-4-2. Its unidirectional configuration provides asymmetric clamping-low forward voltage (3.5V @ 50A) during surge conduction while blocking reverse leakage below 5.80V.
Thermally, it supports continuous operation up to +150°C junction temperature with RθJC = 15°C/W and RθJA = 50°C/W, and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1-ensuring robust reliability in reflow-soldered industrial and automotive control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 6.46V / 7.14V - defines guaranteed breakdown onset range at 10mA test current; ensures reliable triggering before protected circuit damage |
| VWM | 5.80V - maximum continuous reverse operating voltage; must exceed system's highest normal DC rail voltage (e.g., 5V USB) |
| VC@IPPM | 10.5V at 1000A - clamping voltage under 10/1000μs surge; determines worst-case stress on downstream ICs |
| PPK | 1500W - peak pulse power handling per 1ms waveform; validates compliance with ISO 7637-2 Pulse 3b (load dump) |
| IR@VWM | <1μA - ultra-low leakage at stand-off voltage; prevents battery drain in always-on IoT nodes |
| TJ max | +150°C - maximum junction temperature; enables use in under-hood automotive ECUs without derating |
| RθJA | 50°C/W - junction-to-ambient thermal resistance; informs PCB copper area requirements for sustained 6.5W dissipation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional TVS diode with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., USB D+); conducts surge current toward ground when VAK > VBR |
| Cathode | Ground reference | Connected to system ground plane; establishes clamping reference and enables low-VF conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 10.5V max clamping at 1000A ensures safe margin below 12V logic IC absolute maximum ratings |
| ESD immunity | Meets IEC 61000-4-2 ±30kV contact discharge due to sub-1ps response and low dynamic impedance |
| Automated assembly support | DO-214AB package and level-1 moisture sensitivity enable standard SMT pick-and-place without baking |
| Transient standards compliance | Validated per ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery transients), and Pulse 3a/3b (capacitive coupling) |
| Environmental compliance | RoHS-compliant and halogen-free per IEC 61249-2-21-supports green manufacturing and end-of-life recycling |
Applications
| Industrial Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting 4–20mA current-loop transmitters and RS-485 nodes from field-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between signal line and chassis ground, absorbing multi-kV transients before they reach isolated ADC or UART transceivers. Use Value: Prevents latch-up and gate oxide rupture in analog front-end ICs by limiting transient voltage to ≤10.5V during 1kA events per IEC 61000-4-5. |
Use Scenario: Safeguarding USB host controller D+/D− pins against ESD events during hot-plug insertion in embedded medical devices. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector, shunting ESD energy away from USB PHY's differential inputs. Use Value: Maintains signal integrity with <1pF typical junction capacitance while meeting IEC 61000-4-2 ±15kV air/±8kV contact discharge requirements. |
| Automotive Body Control Module | DC Power Rail Protection |
Use Scenario: Suppressing load-dump transients on 12V supply lines feeding microcontrollers and CAN transceivers in door module ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between battery rail and ground, clamping ISO 7637-2 Pulse 5a (load dump) spikes to ≤10.5V. Use Value: Enables direct connection to 12V systems without external series impedance, eliminating need for additional filtering components. |
Use Scenario: Guarding 5V/3.3V LDO outputs in PoE-powered surveillance cameras against induced surges on long Ethernet cables. IC Role / Device Role / Timing Role: Secondary protection device placed after primary MOV, clamping residual overshoot to protect downstream PMICs and SoCs. Use Value: Provides precise, repeatable clamping at 10.5V-lower than generic Zener-based solutions-reducing risk of brownout during surge recovery. |
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 (Bourns) | Same DO-214AA (SMB) package; 600W PPK, 11.2V VC@500A - lower power rating and higher clamping voltage | Not suitable for ISO 7637-2 Pulse 3b or high-current load dump; limited to consumer-grade USB/Ethernet protection | Select only if board space constraints require SMB footprint and surge threat level is ≤600W |
| 1.5KE6.8A (Taiwan Semiconductor) | Through-hole DO-15 package; identical electrical specs but incompatible with SMT assembly; 1500W rating retained | Requires manual or wave soldering; unsuitable for high-volume automated production or compact PCBs | Choose only for prototyping, repair, or legacy through-hole designs where rework is acceptable |
Compared with SMBJ6.8A and 1.5KE6.8A, the 1.5SMC6.8A delivers superior surge robustness in an SMT-optimized package-enabling full ISO 7637-2 compliance without layout compromise or assembly process change.
Availability
1.5SMC6.8A is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB data line protection, automotive body control modules, and DC power rail protection requiring stable component supply across extended product lifecycles.
Supply support for 1.5SMC6.8A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.
The 1.5SMC6.8A belongs to TSC's SMC-series TVS family, engineered specifically for high-power, surface-mount surge protection in harsh electromagnetic environments-including automotive load-dump and industrial EFT scenarios.
FAQ
What is the polarity configuration of the 1.5SMC6.8A?
The 1.5SMC6.8A is a unidirectional TVS diode with clearly marked cathode band. It functions as a reverse-biased clamp-conducting only when the anode-to-cathode voltage exceeds the breakdown threshold (6.46–7.14V). Forward conduction occurs at ~3.5V, allowing use in DC rail protection where polarity is fixed. This differs from bidirectional variants (e.g., 1.5SMC6.8CA), which suppress surges in both directions.
Does the 1.5SMC6.8A meet automotive transient standards?
Yes, the 1.5SMC6.8A is explicitly validated per ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery transients), and Pulse 3a/3b (capacitive coupling), as stated in its official datasheet. Its 1500W peak power rating and 10.5V clamping voltage at 1000A ensure compliance with automotive-level surge immunity requirements for 12V systems without additional external components.
How does the 1.5SMC6.8A compare to the 1.5SMC6.8 (non-A) variant?
The 1.5SMC6.8A offers tighter breakdown voltage tolerance (6.46–7.14V) versus the standard 1.5SMC6.8 (6.12–7.48V), resulting in more predictable clamping behavior and reduced risk of premature conduction. Both share identical package (DO-214AB), power rating (1500W), and thermal specs-but the "A" suffix denotes enhanced VBR consistency critical for precision protection in sensitive analog or communication circuits.
What is the maximum allowable mounting temperature for the 1.5SMC6.8A during reflow soldering?
The 1.5SMC6.8A is rated for Moisture Sensitivity Level 1 per J-STD-020, meaning it can withstand standard lead-free reflow profiles without pre-baking. Peak reflow temperature must not exceed 260°C for ≤10 seconds, consistent with IPC/JEDEC J-STD-020D. The DO-214AB package's UL 94V-0 molding compound and matte tin plating ensure reliable solder joint formation under these conditions.
Can the 1.5SMC6.8A be used in bidirectional signal line protection?
No-the 1.5SMC6.8A is unidirectional and unsuitable for AC or bidirectional signal lines (e.g., RS-485, CAN, audio). For such applications, select the bidirectional variant 1.5SMC6.8CA, which provides symmetrical clamping in both polarities. Using the 1.5SMC6.8A on bidirectional lines risks forward conduction during normal signal swing, causing distortion or latch-up.
1.5SMC6.8A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.8V
- Voltage - Breakdown (Min):
- 6.46V
- Voltage - Clamping (Max) @ Ipp:
- 10.5V
- Current - Peak Pulse (10/1000µs):
- 150A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC6.8A FAQ
1.How can I place an order for 1.5SMC6.8A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC6.8A 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 reliable?
The price and inventory of 1.5SMC6.8A 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 is usually 5 days.
3.What payment methods are accepted for 1.5SMC6.8A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC6.8A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC6.8A?
1.5SMC6.8A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC6.8A 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?
For technical support, including 1.5SMC6.8A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC6.8A requirements.
6.How does Aetrix verify that 1.5SMC6.8A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC6.8A 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 meets industry standards.
7.What is the process for return or replacement of 1.5SMC6.8A?
All 1.5SMC6.8A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC6.8A, 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 part is unused and in its original packaging.
Return procedure for 1.5SMC6.8A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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