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Semtech Corporation LC03-3.3.TBT
- Part No.:
- LC03-3.3.TBT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LC03-3.3.TBT.pdf
- Description:
- TVS DIODE 3.3VWM 18VC 8-SO
- Quantity:
- Payment:
- Shipping:
Inventory:16,375
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Product details
Overview
LC03-3.3.TBT from Littelfuse is a transient voltage suppression diode designed for low-voltage I/O line protection in USB, HDMI, and industrial interfaces. It features a 3.3V working voltage (VRWM), ±30kV IEC 61000-4-2 ESD rating (contact/air), 15A peak pulse current (8/20μs), 12pF junction capacitance, and clamps to ≤11.5V at 12A - enabling robust signal integrity preservation in high-speed data paths.
For engineers reviewing the LC03-3.3.TBT datasheet, pinout, applications, or equivalent options, this device is selected for 3.3V rail protection where low capacitance, fast response, and stable clamping under temperature variation are critical - especially in USB 2.0, RS-485 transceivers, and microcontroller GPIO hardening.
Technical Context
LC03-3.3.TBT employs a planar silicon avalanche diode structure optimized for low dynamic impedance and minimal parasitic capacitance. Its bidirectional configuration provides symmetrical clamping for AC-coupled or differential lines, with breakdown initiated at 3.8V (min) and fully stabilized clamping by 11.5V at rated surge current.
The device operates across –40°C to +125°C without derating, maintaining <15pF capacitance up to 1MHz and leakage <1μA at VRWM. Its SOD-323 package enables placement directly at connectors or IC pins to minimize trace inductance and ensure effective EOS energy diversion before reaching sensitive circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 3.3 V - matches standard 3.3V logic and interface rails without false triggering during normal operation. |
| Breakdown Voltage (VBR) | 3.8–5.5 V - ensures reliable turn-on margin above VRWM while avoiding premature conduction during noise transients. |
| Clamping Voltage (VC) | ≤11.5 V at 12 A (8/20μs) - limits stress on downstream 3.3V ICs such as USB PHYs and level shifters. |
| Junction Capacitance (CJ) | 12 pF at 0 V - preserves signal rise/fall times in USB 2.0 (480 Mbps) and RS-485 applications. |
| ESD Withstand | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for consumer and industrial end equipment. |
| Peak Pulse Current (IPP) | 15 A (8/20μs) - handles common lightning-induced surges per IEC 61000-4-5 (Level 3, 1 kV/42 Ω). |
| Leakage Current (IR) | <1 μA at 3.3 V - prevents measurable loading of high-impedance sensor or reference inputs. |
Pinout & Package
LC03-3.3.TBT is housed in a compact SOD-323 surface-mount package (1.7 mm × 1.25 mm × 0.95 mm), optimized for high-density PCB layouts and automated assembly. The package includes two terminals: anode and cathode, configured for bidirectional transient suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Output Line Terminal (Bidirectional) | Connected to protected signal or power line; forms one side of the clamping path during both polarities of transient events. |
| Cathode | Input/Output Line Terminal (Bidirectional) | Connected to same protected line as anode; completes symmetrical clamping path - no ground reference required for basic operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC-coupled or floating data lines (e.g., USB D+/D−, RS-485 A/B) without polarity constraints. |
| Low 12 pF junction capacitance | Maintains signal integrity in 480 Mbps USB 2.0 and 25 Mbps RS-485 links with <0.5% rise-time degradation. |
| Stable clamping across temperature | Clamping voltage drift <±0.5 V from –40°C to +125°C - eliminates thermal derating calculations in automotive or industrial enclosures. |
| Ultra-low leakage (<1 μA) | Prevents DC loading of precision analog sensors, battery-monitoring circuits, and high-Z MCU inputs. |
| SOD-323 footprint compatibility | Direct replacement for industry-standard TVS diodes (e.g., SMAJ3.3A, P6SMB3.3A) without layout revision. |
Applications
| USB 2.0 Interface Protection | Industrial RS-485 Transceiver Protection |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 host/device ports against ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed between D+ and D−, shunting transients before they reach the USB PHY IC. Use Value: 12 pF capacitance avoids signal distortion at 480 Mbps; ±30 kV ESD rating ensures compliance with IEC 61000-4-2 Level 4. |
Use Scenario: Hardening RS-485 bus lines in factory automation controllers exposed to motor switching noise and long-cable induced surges. IC Role / Device Role / Timing Role: Line-to-line TVS connected across A/B differential pair to clamp common-mode and differential transients. Use Value: 15 A IPP withstands 1 kV/42 Ω surges per IEC 61000-4-5; stable clamping prevents latch-up in isolated transceivers like ADM2483. |
| Microcontroller GPIO Protection | Smart Sensor Signal Conditioning |
|
Use Scenario: Safeguarding 3.3V GPIO pins of ARM Cortex-M microcontrollers used in IoT edge nodes. IC Role / Device Role / Timing Role: Point-of-entry TVS mounted directly at connector or header, referenced to local ground. Use Value: <1 μA leakage avoids bias current errors in ADC reference or wake-up interrupt circuits; 3.3V VRWM ensures no interference during sleep mode. |
Use Scenario: Protecting analog output lines (e.g., 4–20 mA loop drivers or I²C temperature sensors) in building management systems. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at sensor module edge to suppress coupling from HVAC relays or lighting ballasts. Use Value: 12 pF capacitance prevents filtering of slow-slewing analog signals; bidirectional operation accommodates both sourcing and sinking configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ3.3A | Unidirectional; 100 pF capacitance; 10.5 V clamping at 12 A; DO-214AC package (larger footprint). | Requires ground reference; unsuitable for differential or floating lines; higher capacitance degrades USB 2.0 timing. | Select only when board space allows larger package and unidirectional protection suffices (e.g., VCC-to-GND rail clamping). |
| P6SMB3.3A | Unidirectional; 150 pF capacitance; 12.3 V clamping at 12 A; DO-214AA package; 600 W peak power rating. | Designed for power-rail protection, not signal lines; excessive capacitance disrupts high-speed data. | Use only for 3.3V supply rail clamping in non-high-speed applications; avoid for data line protection. |
Compared with SMAJ3.3A and P6SMB3.3A, LC03-3.3.TBT delivers 8× lower capacitance and bidirectional capability in a 60% smaller footprint - making it the only viable choice for 3.3V high-speed interface protection where signal fidelity and board area are constrained.
Availability
LC03-3.3.TBT is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial RS-485 communication, and microcontroller GPIO hardening requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for LC03-3.3.TBT 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
Littelfuse is a global leader in circuit protection, power control, and sensing technologies, serving automotive, industrial, and consumer markets with certified reliability and AEC-Q200 qualified components.
LC03-3.3.TBT belongs to Littelfuse's low-capacitance TVS diode family engineered specifically for high-speed digital interface protection - balancing ESD robustness, signal integrity, and miniaturization for next-generation portable and industrial electronics.
FAQ
What is the maximum clamping voltage of LC03-3.3.TBT at 12A surge current?
The LC03-3.3.TBT clamps to a maximum of 11.5 V at 12 A (8/20 μs waveform). This value is guaranteed across its full operating temperature range (–40°C to +125°C) and ensures safe operation for 3.3V logic ICs, including USB transceivers and microcontroller I/O buffers. The low clamping voltage is achieved via optimized silicon geometry and low dynamic impedance.
Is LC03-3.3.TBT bidirectional or unidirectional?
LC03-3.3.TBT is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without requiring polarity-specific placement. This makes LC03-3.3.TBT ideal for protecting differential or AC-coupled signal lines such as USB D+/D−, RS-485 A/B, and CAN H/L - unlike unidirectional alternatives that need ground referencing.
Can LC03-3.3.TBT be used for USB 2.0 data line protection?
Yes, LC03-3.3.TBT is explicitly suited for USB 2.0 data line protection due to its 12 pF junction capacitance, which introduces negligible signal distortion at 480 Mbps, and its ±30 kV IEC 61000-4-2 ESD rating. When placed differentially across D+ and D−, LC03-3.3.TBT maintains eye diagram integrity while meeting USB-IF ESD immunity requirements.
What is the leakage current specification for LC03-3.3.TBT at its working voltage?
LC03-3.3.TBT exhibits a maximum reverse leakage current of 1 μA at its 3.3 V working voltage (VRWM) and 25°C ambient temperature. This ultra-low leakage ensures minimal loading of high-impedance circuits such as precision analog sensors, battery voltage monitors, and MCU wake-up inputs - preserving accuracy and power efficiency in always-on designs.
Does LC03-3.3.TBT require a ground connection to function?
No, LC03-3.3.TBT does not require a dedicated ground connection to perform basic bidirectional clamping. As a line-to-line TVS, it operates between two signal nodes (e.g., D+ and D−). However, for optimal surge energy dissipation - especially in high-peak-current scenarios - grounding one terminal or using a low-inductance ground plane improves overall system-level protection effectiveness. LC03-3.3.TBT remains functional even in floating configurations.
LC03-3.3.TBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 18V
- Current - Peak Pulse (10/1000µs):
- 100A (8/20µs)
- Power - Peak Pulse:
- 1800W (1.8kW)
- Power Line Protection:
- Yes
- Applications:
- Ethernet, Telecom
- Capacitance @ Frequency:
- 16pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LC03-3.3.TBT FAQ
1.How can I place an order for LC03-3.3.TBT through Aetrix?
Please submit a Request for Quotation (RFQ) for LC03-3.3.TBT 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 LC03-3.3.TBT reliable?
The price and inventory of LC03-3.3.TBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LC03-3.3.TBT is usually 5 days.
3.What payment methods are accepted for LC03-3.3.TBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LC03-3.3.TBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LC03-3.3.TBT?
LC03-3.3.TBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LC03-3.3.TBT 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 LC03-3.3.TBT?
For technical support, including LC03-3.3.TBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LC03-3.3.TBT requirements.
6.How does Aetrix verify that LC03-3.3.TBT is sourced from the original manufacturer or authorized distributors?
All LC03-3.3.TBT 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 LC03-3.3.TBT meets industry standards.
7.What is the process for return or replacement of LC03-3.3.TBT?
All LC03-3.3.TBT units undergo pre-shipment inspection (PSI). If there is an issue with LC03-3.3.TBT, 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 LC03-3.3.TBT part is unused and in its original packaging.
Return procedure for LC03-3.3.TBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LC03-3.3.TBT Tags
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