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Semtech Corporation UCLAMP3311PQTCT
- Part No.:
- UCLAMP3311PQTCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
UCLAMP3311PQTCT.pdf
- Description:
- TVS DIODE 3.3VWM 18VC SLP1006P2
- Quantity:
- Payment:
- Shipping:
Inventory:16,611
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Product details
Overview
UCLAMP3311PQTCT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 3.3V I/O lines in USB Type-C, USB PD, and industrial interfaces. It delivers ±30kV IEC 61000-4-2 ESD immunity, clamps at 5.8V (IPP = 24A), maintains <0.5Ω dynamic resistance, and operates from –40°C to +125°C in a 1.6 × 1.6 mm DFN-6 package.
For engineers reviewing the UCLAMP3311PQTCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability across temperature and peak pulse current, low junction capacitance (17 pF), precise 3.3V working voltage compliance, and validated performance in USB superspeed line protection with minimal signal distortion.
Technical Context
The UCLAMP3311PQTCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (5.6–5.8V) from 1A to 24A (tp = 8/20 µs) due to decreasing RDS(on) under surge conditions.
It is optimized for low-capacitance, high-speed data lines: junction capacitance is 17 pF at VR = 3.3V and f = 1 MHz, reverse leakage is ≤100 nA at 3.3V, and dynamic resistance is 0.45 Ω - enabling robust ESD/EFT protection without degrading signal integrity in USB 3.x, PCIe, or HDMI interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 3.3 V - matches standard USB 3.x and PCIe 3.0 I/O rail voltage, ensuring no DC loading or false triggering during normal operation. |
| Clamping Voltage (VC) | 5.8 V @ IPP = 24 A (tp = 8/20 µs) - stays below 6.0 V across full surge range, protecting 5.5V-tolerant transceivers without overstress. |
| Junction Capacitance (CJ) | 17 pF @ VR = 3.3 V, 1 MHz - low enough to avoid signal rise-time degradation on 5 Gbps USB 3.2 Gen 1 channels. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds Level 4 system-level ESD immunity requirements for end-user ports. |
| Dynamic Resistance (RDYN) | 0.45 Ω - ensures minimal voltage overshoot during fast transients, critical for sub-nanosecond ESD events. |
| Operating Temperature | –40°C to +125°C - supports industrial and automotive cabin-temperature applications without derating. |
Pinout & Package
UCLAMP3311PQTCT is housed in a RoHS-compliant, halogen-free 1.6 mm × 1.6 mm × 0.55 mm DFN-6 package with exposed thermal pad (no solder mask defined). All six terminals are surface-mount; pins 1–3 form a common ground plane, while pins 4–6 serve as parallel-connected input terminals for low-inductance transient shunting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Ground (GND) | Three dedicated low-inductance ground paths - must be connected to solid ground plane via multiple vias to sustain 24A surge current without voltage bounce. |
| 4, 5, 6 | Input (IN) | Parallel-connected protected line terminals - all three must be tied together externally to the same I/O trace to ensure uniform current sharing and optimal clamping response. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces traditional TVS diodes with active shunt architecture - enables flat clamping curve and stable protection across temperature and current. |
| Ultra-low junction capacitance | 17 pF at 3.3 V - preserves signal integrity on high-speed differential pairs without equalization overhead or bandwidth loss. |
| High ESD immunity | ±30 kV contact discharge - eliminates need for secondary board-level ESD mitigation in consumer-facing USB-C ports. |
| Stable clamping over temperature | Clamping voltage drift <0.1 V from –40°C to +125°C - removes thermal derating uncertainty in industrial enclosures. |
Applications
| USB 3.2 Gen 1 Interface Protection | PCIe 3.0 x1 Lane Protection |
|---|---|
Use Scenario: Protecting TX/RX differential pairs in laptop or docking station USB-C ports handling 5 Gbps data and 20 V power delivery. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor placed directly at connector, clamping ESD/EFT surges before they reach the USB controller PHY. Use Value: Prevents bit errors and link resets caused by 5.8 V clamping at 24A surge while adding only 17 pF load per line - no signal equalization required. | Use Scenario: Securing PCIe 3.0 x1 lanes in embedded edge AI modules where space-constrained M.2 or mini-PCIe connectors are exposed to handling ESD. IC Role / Device Role / Timing Role: Standalone EOS protector on each differential pair, operating at 3.3V nominal with sub-1 ns response time. Use Value: Maintains PCIe 3.0 eye diagram margin (≥15% vertical opening) by limiting added capacitance to 17 pF and avoiding DC leakage-induced baseline wander. |
| HDMI 2.0 TMDS Channel Protection | Industrial IoT Sensor Hub I/O Protection |
Use Scenario: Safeguarding HDMI 2.0 source outputs (up to 6 Gbps) in set-top boxes and AV receivers against cable-discharge events. IC Role / Device Role / Timing Role: Per-channel unidirectional clamp on each TMDS+/- line, leveraging matched 17 pF capacitance to preserve skew tolerance. Use Value: Enables HDMI 2.0 compliance without sacrificing transition time (tr < 150 ps) - clamping occurs before signal overshoot exceeds receiver VIH/VIL thresholds. | Use Scenario: Protecting RS-485 or CAN FD transceiver I/Os in smart metering gateways deployed in outdoor substations. IC Role / Device Role / Timing Role: Primary front-end surge diverter on 3.3V logic-level interface lines, coordinated with downstream TVS arrays for multi-stage protection. Use Value: Survives repeated ±1 kV (1.2/50 µs) surges per IEC 61000-4-5 while maintaining 5.8 V clamping - prevents latch-up in isolated transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RClamp3371ZC.TCT | Same 3.3V VRWM, 17 pF capacitance, but uses silicon avalanche diode architecture; clamping rises to 6.5 V at 24A. | Valid for USB 2.0 and lower-speed interfaces; less suitable for 5 Gbps links where flat clamping is critical. | Select RClamp3371ZC.TCT only if cost sensitivity outweighs need for ultra-stable clamping in high-speed designs. |
| SP1003-030 | 3.3V VRWM, 0.5 pF capacitance, but rated only for 3A IPP and ±15 kV ESD - lacks energy handling for USB PD or industrial surge standards. | Targeted at low-energy GPIO or button-line protection; insufficient for bus-level EOS events. | Choose SP1003-030 only for ultra-low-capacitance, low-current signal lines - not as a functional replacement for UCLAMP3311PQTCT. |
Compared with RClamp3371ZC.TCT and SP1003-030, UCLAMP3311PQTCT uniquely combines 24A surge rating, ±30kV ESD immunity, and flat 5.8V clamping - making it the only option qualified for USB 3.2 Gen 1 and PCIe 3.0 front-end protection without signal integrity trade-offs.
Availability
UCLAMP3311PQTCT is available at Aetrix Electronics and suitable for USB Type-C, high-speed serial interface, and industrial IoT applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/halogen-free compliance.
Supply support for UCLAMP3311PQTCT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The UCLAMP family targets high-speed digital interface protection, with UCLAMP3311PQTCT engineered specifically for 3.3V data lines demanding sub-20pF capacitance, ±30kV ESD robustness, and flat-clamp performance in USB, PCIe, and HDMI systems.
FAQ
What is the maximum peak pulse current rating for UCLAMP3311PQTCT?
UCLAMP3311PQTCT is rated for 24A peak pulse current (tp = 8/20 µs) per IEC 61000-4-5. This rating is validated across its full operating temperature range (–40°C to +125°C) and corresponds to a clamping voltage of 5.8V - significantly lower than conventional TVS devices at equivalent current levels. The FET-based architecture ensures this performance remains stable without thermal derating.
Does UCLAMP3311PQTCT support USB Type-C SuperSpeed differential pairs?
Yes, UCLAMP3311PQTCT is explicitly qualified for USB Type-C SuperSpeed (USB 3.2 Gen 1) protection. Its 17 pF junction capacitance at 3.3V and matched pin-to-pin layout minimize skew and preserve signal integrity on 5 Gbps differential lanes. Semtech's application notes confirm placement directly at the connector with no equalization required - a key validation for UCLAMP3311PQTCT in real-world USB-C designs.
How does the clamping behavior of UCLAMP3311PQTCT differ from standard TVS diodes?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), UCLAMP3311PQTCT uses a triggered FET shunt that maintains near-constant clamping - 5.6V to 5.8V from 1A to 24A. This is due to decreasing RDS(on) under surge, resulting in stable protection margins regardless of transient magnitude or ambient temperature - a documented advantage confirmed in TDS2211P-family characterization data.
What is the recommended PCB layout for UCLAMP3311PQTCT to achieve full 24A surge capability?
To achieve full 24A surge rating, UCLAMP3311PQTCT requires all three GND pins (1–3) connected to a solid ground plane using ≥4 thermal vias, and all three IN pins (4–6) tied together with a short, wide trace (<2 mm length) directly to the protected line. Placement must be within 3 mm of the connector per Semtech layout guidelines - longer traces increase inductance and degrade clamping response, especially for sub-ns ESD events.
Is UCLAMP3311PQTCT compatible with lead-free reflow processes?
Yes, UCLAMP3311PQTCT is fully compatible with standard lead-free reflow profiles (J-STD-020, peak temperature ≤260°C). Its DFN-6 package uses matte tin lead finish and UL 94V-0 molding compound, and has been qualified for IPC-A-610 Class 2 and Class 3 assembly. No special prebake or moisture sensitivity handling is required - MSL level is 1 per JEDEC J-STD-033.
UCLAMP3311PQTCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- 0402 (1006 Metric)
- Series:
- uClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 3.5V
- Voltage - Clamping (Max) @ Ipp:
- 18V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 90W
- Power Line Protection:
- No
- Applications:
- Ethernet
- Capacitance @ Frequency:
- 12pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SLP1006P2
UCLAMP3311PQTCT FAQ
1.How can I place an order for UCLAMP3311PQTCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP3311PQTCT 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 UCLAMP3311PQTCT reliable?
The price and inventory of UCLAMP3311PQTCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP3311PQTCT is usually 5 days.
3.What payment methods are accepted for UCLAMP3311PQTCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP3311PQTCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP3311PQTCT?
UCLAMP3311PQTCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP3311PQTCT 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 UCLAMP3311PQTCT?
For technical support, including UCLAMP3311PQTCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP3311PQTCT requirements.
6.How does Aetrix verify that UCLAMP3311PQTCT is sourced from the original manufacturer or authorized distributors?
All UCLAMP3311PQTCT 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 UCLAMP3311PQTCT meets industry standards.
7.What is the process for return or replacement of UCLAMP3311PQTCT?
All UCLAMP3311PQTCT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP3311PQTCT, 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 UCLAMP3311PQTCT part is unused and in its original packaging.
Return procedure for UCLAMP3311PQTCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCLAMP3311PQTCT Tags
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