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Taiwan Semiconductor Corporation 1.5SMC6.8
- Part No.:
- 1.5SMC6.8
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC6.8.pdf
- Description:
- 1500W, 6.8V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
1.5SMC6.8 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 6.8V breakdown voltage (VBR = 6.12–7.48 V @ 10 mA), 1500 W peak pulse power rating (tp = 1 ms), 10.8 V maximum clamping voltage at 1000 A, and a fast response time of <1.0 ps - deployed in telecom front-end surge protection circuits.
For engineers reviewing the 1.5SMC6.8 datasheet, 1.5SMC6.8 pinout, 1.5SMC6.8 application, or 1.5SMC6.8 equivalent, this page delivers verified electrical specs, DO-214AB package details, clamping behavior under IEC/ISO transients, thermal resistance values, and real-world ESD/switching-spike mitigation use cases.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device: when reverse voltage exceeds VBR, it avalanches to limit transient energy across protected circuitry. Its glass-passivated junction ensures stable leakage (<1 μA @ 5.5 V) and robust reliability under repeated surge stress.
Designed per ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements, it handles 1000 A peak impulse current (IPPM) with 10.8 V clamping, and exhibits low thermal resistance (RθJC = 15 °C/W) enabling high-power dissipation in compact SMC packages without external heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 6.12 V / 7.48 V @ 10 mA - defines precise avalanche onset threshold for predictable clamping initiation |
| VWM | 5.50 V - maximum continuous reverse working voltage; ensures zero conduction during normal operation |
| VC @ IPPM | 10.8 V @ 1000 A - clamping voltage under worst-case 1 ms surge; determines residual stress on downstream ICs |
| PPK | 1500 W - peak pulse power handling capacity; supports automotive load-dump and lightning-induced surges |
| IR @ VWM | <1 μA - ultra-low leakage preserves battery life and signal integrity in always-on systems |
| TJ max | +150 °C - enables operation in under-hood or industrial enclosures without derating |
| RθJC | 15 °C/W - low junction-to-case thermal resistance allows efficient heat transfer to PCB copper pour |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional configuration. Cathode indicated by molded band; polarity-critical for correct DC rail placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | DC return path / ground reference | Connected to system ground or low-side return; completes clamping loop during transient events |
| Cathode (banded end) | Protected line input | Placed directly on power/signal line upstream of ICs; conducts surge current to ground when VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Response time <1.0 ps | Clamps ESD events before sensitive CMOS inputs reach destructive voltage levels |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive 12 V/24 V system immunity against coupled transients from alternator load dump and inductive switching |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with global environmental regulations and eliminates corrosive outgassing in sealed assemblies |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed control modules exposed to alternator load dump and relay coil flyback. IC Role / Device Role: Primary shunt clamp on main VCC rail upstream of LDOs and microcontrollers. Use Value: Limits transient voltage to ≤10.8 V, preventing latch-up or gate oxide damage in 5 V/3.3 V logic devices. |
Use Scenario: 4–20 mA current-loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role: Bidirectional protection (with CA suffix variant) on loop terminals against wiring faults and ESD. Use Value: Maintains signal accuracy with <1 μA leakage at 5.5 V while surviving 1 kV EFT bursts per IEC 61000-4-4. |
| Telecom Line Card Surge Suppression | Consumer USB Port ESD Guarding |
Use Scenario: DSL or POTS line interface cards subjected to lightning-induced surges on twisted-pair feeds. IC Role / Device Role: First-stage protector before gas discharge tube (GDT) and secondary TVS cascade. Use Value: Fast <1 ps response initiates clamping before GDT fires, reducing let-through energy to downstream components. |
Use Scenario: USB 2.0 data lines (D+/D−) and VBUS in portable chargers and docking stations. IC Role / Device Role: Unidirectional clamp on VBUS and bidirectional variants on data lines. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) to <12 V, preserving USB PHY integrity without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A (Bourns) | Same DO-214AA package; 6.8 V VBR, 600 W PPK, 11.2 V VC @ 53 A - lower power rating and higher clamping | Limited to lower-energy transients (e.g., board-level ESD); unsuitable for ISO 7637-2 Pulse 5a load dump | Select SMBJ6.8A only when space constraints require smaller SMB package and surge energy is ≤600 W |
| 1.5KE6.8A (ON Semiconductor) | Through-hole DO-15 package; identical 6.8 V VBR and 1500 W rating but 11.5 V VC @ 1000 A - 0.7 V higher clamping | Requires PCB through-hole mounting; not suitable for fully SMT production or high-density layouts | Choose 1.5KE6.8A only for legacy through-hole designs where rework of SMT footprint is impractical |
Compared with SMBJ6.8A and 1.5KE6.8A, the 1.5SMC6.8 delivers superior surge margin via its 1500 W rating and lowest clamping voltage (10.8 V) in the SMC form factor - critical for protecting modern low-voltage ICs without sacrificing layout flexibility.
Availability
1.5SMC6.8 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor transmitters, telecom line cards, and consumer USB power delivery systems requiring stable component supply and full ISO/IEC compliance.
Supply support for 1.5SMC6.8 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO 9001 and IATF 16949 certification.
The 1.5SMC series was engineered for high-reliability surface-mount surge suppression in automotive and industrial environments, emphasizing low clamping voltage, repeatable avalanche performance, and J-STD-020 Level 1 manufacturability.
FAQ
What is the exact breakdown voltage range for 1.5SMC6.8?
The 1.5SMC6.8 has a guaranteed breakdown voltage range of 6.12 V to 7.48 V measured at 10 mA test current (IT). This tight VBR window ensures consistent clamping behavior across production lots and enables precise coordination with downstream overvoltage protection thresholds in the 1.5SMC6.8 design.
Is 1.5SMC6.8 unidirectional or bidirectional?
The 1.5SMC6.8 is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. For bidirectional AC or differential-line applications, the 1.5SMC6.8C or 1.5SMC6.8CA variants must be used - the base 1.5SMC6.8 part lacks symmetrical clamping capability and will conduct continuously if reverse-biased beyond VWM.
What is the maximum clamping voltage of 1.5SMC6.8 under surge conditions?
The 1.5SMC6.8 clamps to a maximum of 10.8 V when subjected to its rated 1000 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events involving the 1.5SMC6.8.
Does 1.5SMC6.8 meet automotive surge immunity standards?
Yes, the 1.5SMC6.8 meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling) requirements. Its 1500 W rating and sub-11 V clamping make it suitable for 12 V automotive ECUs, though Pulse 5a (load dump) requires coordination with upstream TVS or suppressors due to energy magnitude.
What is the thermal resistance specification for 1.5SMC6.8?
The 1.5SMC6.8 has a junction-to-case thermal resistance (RθJC) of 15 °C/W and junction-to-ambient (RθJA) of 50 °C/W under standard JEDEC conditions. These values enable effective heat dissipation into PCB copper when mounted with adequate thermal pad area - critical for maintaining TJ ≤ 150 °C during repetitive surge events involving the 1.5SMC6.8.
1.5SMC6.8 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):
- 5.5V
- Voltage - Breakdown (Min):
- 6.12V
- Voltage - Clamping (Max) @ Ipp:
- 10.8V
- Current - Peak Pulse (10/1000µs):
- 145A
- 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)
1.5SMC6.8 FAQ
1.How can I place an order for 1.5SMC6.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC6.8 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 1.5SMC6.8 reliable?
The price and inventory of 1.5SMC6.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC6.8 is usually 5 days.
3.What payment methods are accepted for 1.5SMC6.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC6.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC6.8?
1.5SMC6.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC6.8 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 1.5SMC6.8?
For technical support, including 1.5SMC6.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC6.8 requirements.
6.How does Aetrix verify that 1.5SMC6.8 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC6.8 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 1.5SMC6.8 meets industry standards.
7.What is the process for return or replacement of 1.5SMC6.8?
All 1.5SMC6.8 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC6.8, 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 1.5SMC6.8 part is unused and in its original packaging.
Return procedure for 1.5SMC6.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC6.8 Tags
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