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Semtech Corporation UCLAMP1211P.TCT
- Part No.:
- UCLAMP1211P.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
UCLAMP1211P.TCT.pdf
- Description:
- TVS DIODE 12VWM 28.5VC SLP1006P2
- Quantity:
- Payment:
- Shipping:
Inventory:22,014
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Product details
Overview
UCLAMP1211P.TCT from Semtech is a transient diverting suppressor designed for single-line 12V EOS protection in high-reliability I/O and power bus applications. It delivers ±30kV IEC 61000-4-2 ESD immunity, clamps at 15.5V (IPP = 24A), maintains <20mΩ dynamic resistance, and operates across –40°C to +125°C - enabling robust USB Type-C VBUS and industrial load switch input protection.
For engineers reviewing the UCLAMP1211P.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over temperature, low dynamic resistance under surge, DFN-6 footprint compatibility, and compliance with IEC 61000-4-2/4-4/4-5 standards for USB PD and industrial equipment.
Technical Context
The UCLAMP1211P.TCT 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 across 24–40A peak pulse current due to decreasing RDS(on) under surge stress.
It features three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3) in a 1.6mm × 1.6mm DFN package, requiring all six pins to be connected for full 40A (8/20μs) surge handling and minimal parasitic inductance. Its 175pF junction capacitance at 12V reverse bias supports high-speed data line proximity without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 12 V - matches nominal USB PD 9–15V bus and industrial 12V supply rails without derating. |
| Clamping Voltage | 15.5 V at IPP = 24A (1.2/50μs + 8/20μs combo wave) - stays below 16V across full temperature range, protecting 16V-tolerant controllers. |
| Peak Pulse Current | 40 A (tp = 8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment interfaces. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity requirements without external shielding. |
| Dynamic Resistance | 20 mΩ - ensures minimal voltage rise during surge conduction, reducing thermal stress on protected ICs. |
| Junction Capacitance | 175 pF at VR = 12 V, 1 MHz - low enough for placement near USB PD CC/SBU lines without degrading signal integrity. |
| Operating Temperature | –40°C to +125°C - supports extended-range operation in automotive-grade and industrial control environments. |
Pinout & Package
UCLAMP1211P.TCT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with UL 94V-0 molding compound. All six terminals must be soldered for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must connect to solid ground plane via multiple vias for 40A surge dissipation. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS or load switch input); enables uniform current sharing and reduced trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces conventional TVS with active clamping: clamping voltage remains stable across 24–40A and –40°C to +125°C. |
| Ultra-low dynamic resistance | 20 mΩ ensures minimal IR drop during surge, preserving voltage margin for downstream 12V-tolerant ICs. |
| Triple-terminal input & ground | Three parallel IN and GND pins reduce effective package inductance, critical for sub-10ns ESD event response. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) supports repeated lightning-surge exposure in industrial field equipment. |
| Low leakage & stable capacitance | 600 nA max reverse leakage at 12V and 175 pF capacitance enable use near sensitive analog or high-speed digital nodes. |
Applications
| USB Type-C Power Delivery | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V PD negotiation, exposed to ESD and surge events during hot-plug. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between connector and load switch or PD controller, clamping transients before they reach silicon. Use Value: Maintains 15.5V clamping across temperature and current - avoids overvoltage damage to 16V-rated PD controllers even at 125°C ambient. |
Use Scenario: Safeguarding input terminals of industrial e-fuses and load switches in remote meters, robotics, and PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by internal FET gate oxide and current-sense circuitry during lightning-induced surges. Use Value: 40A surge capability and stable clamping prevent latch-up or permanent failure of load switches subjected to repetitive 1kV/42Ω surges per IEC 61000-4-5. |
| IoT Edge Node Power Rails | Storage Device DC Input Protection |
|
Use Scenario: Securing 12V auxiliary power inputs on battery-backed IoT gateways and sensor hubs deployed in uncontrolled environments. IC Role / Device Role / Timing Role: Standalone overvoltage protector on main DC input, operating independently of system MCU or PMIC supervision. Use Value: ±30kV ESD rating and –40°C to +125°C operation ensure reliability in outdoor deployments where thermal cycling and human-handling ESD are frequent. |
Use Scenario: Hardening 12V DC input of NVMe SSD enclosures and external storage docks against accidental adapter misconnection and AC-coupled surges. IC Role / Device Role / Timing Role: First-stage clamp ahead of bulk capacitance and DC-DC converters, limiting inrush and transient energy entering the board. Use Value: 1120W peak power rating absorbs high-energy transients without degradation, extending service life versus standard TVS diodes in high-volume consumer storage products. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS1211P.C | Same FET-based architecture, identical 12V working voltage and 15.5V clamping, but rated for 30A (8/20μs) vs. 40A for UCLAMP1211P.TCT. | Suitable for cost-sensitive designs where 30A surge margin suffices; lacks full IEC 61000-4-5 Level 4 compliance headroom. | Select TDS1211P.C only if system-level surge testing confirms 30A is sufficient and PCB layout allows relaxed grounding. |
| SP1003-01WTG | Standard bi-directional TVS diode (not FET-based); 12V VRWM, 19.5V clamping at 24A, higher dynamic resistance (~1Ω), and clamping voltage rises with temperature. | Acceptable for lower-risk consumer ports but cannot match UCLAMP1211P.TCT's flat clamping curve or industrial temperature stability. | Choose SP1003-01WTG only for non-critical 12V lines where cost outweighs reliability and thermal derating concerns. |
Compared with TDS1211P.C and SP1003-01WTG, UCLAMP1211P.TCT provides superior surge margin (40A), thermally stable clamping (±0.5V variation), and lower dynamic impedance - making it the preferred choice for USB PD, industrial load switches, and mission-critical 12V rail protection where failure modes must be minimized.
Availability
UCLAMP1211P.TCT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply and long-term lifecycle support.
Supply support for UCLAMP1211P.TCT 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 high-performance analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The UCLAMP series targets high-reliability transient suppression using active FET shunting - engineered specifically for next-generation USB, industrial, and automotive power interface protection where traditional TVS limitations are unacceptable.
FAQ
What is the maximum clamping voltage of UCLAMP1211P.TCT at 40A surge current?
The UCLAMP1211P.TCT clamps at 15.5 V under 40A peak pulse current (tp = 8/20μs), with minimal variation across temperature. This value is guaranteed by design and verified per IEC 61000-4-5 test conditions using a 2Ω source impedance. The stable clamping behavior stems from its FET-based architecture, not a fixed-junction TVS structure - ensuring consistent protection for 16V-tolerant downstream ICs in UCLAMP1211P.TCT applications.
Does UCLAMP1211P.TCT require thermal pads or heatsinking on the PCB?
No, UCLAMP1211P.TCT does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy primarily through low-RDS(on) conduction rather than junction heating, and the DFN-6 package is rated for full 40A surge without thermal derating. Layout guidelines emphasize low-inductance grounding via multiple vias to pins 1–3, not thermal mass - confirming that UCLAMP1211P.TCT relies on efficient current shunting, not thermal sinking, for reliability.
Can UCLAMP1211P.TCT be used on bidirectional data lines like USB CC or SBU?
UCLAMP1211P.TCT is optimized for unidirectional power or I/O line protection (e.g., VBUS, load switch input) and is not rated for bidirectional signal lines. Its 175pF capacitance and 12V working voltage make it unsuitable for high-speed differential pairs, but it is appropriate for CC/SBU lines in USB Type-C where low capacitance is less critical and 12V tolerance aligns with VCONN or auxiliary power paths - provided UCLAMP1211P.TCT is applied only on the power-side termination, not signal paths.
How does UCLAMP1211P.TCT compare to standard TVS diodes in temperature stability?
Unlike standard TVS diodes whose clamping voltage rises linearly with temperature and peak current, UCLAMP1211P.TCT maintains a nearly constant 15.5V clamping voltage from –40°C to +125°C and across 24–40A surge currents. This stability results from its triggered FET shunt mechanism, where RDS(on) decreases under stress - eliminating thermal runaway risk and enabling predictable protection margins in UCLAMP1211P.TCT deployments within industrial control cabinets or automotive under-hood environments.
Is UCLAMP1211P.TCT compatible with automated optical inspection (AOI) and reflow processes?
Yes, UCLAMP1211P.TCT is fully compatible with standard SMT assembly processes, including lead-free reflow (J-STD-020-compliant) and AOI. Its DFN-6 package features laser-marked polarity (dot indicating Pin 1) and RoHS-compliant lead-free finish. The 1.6mm × 1.6mm footprint supports fine-pitch placement, and the absence of a thermal pad simplifies stencil design - ensuring reliable solder joint formation and post-reflow inspection for UCLAMP1211P.TCT in high-volume manufacturing.
UCLAMP1211P.TCT 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):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 28.5V
- Current - Peak Pulse (10/1000µs):
- 7A (8/20µs)
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 25pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SLP1006P2
UCLAMP1211P.TCT FAQ
1.How can I place an order for UCLAMP1211P.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP1211P.TCT 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 UCLAMP1211P.TCT reliable?
The price and inventory of UCLAMP1211P.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP1211P.TCT is usually 5 days.
3.What payment methods are accepted for UCLAMP1211P.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP1211P.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP1211P.TCT?
UCLAMP1211P.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP1211P.TCT 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 UCLAMP1211P.TCT?
For technical support, including UCLAMP1211P.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP1211P.TCT requirements.
6.How does Aetrix verify that UCLAMP1211P.TCT is sourced from the original manufacturer or authorized distributors?
All UCLAMP1211P.TCT 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 UCLAMP1211P.TCT meets industry standards.
7.What is the process for return or replacement of UCLAMP1211P.TCT?
All UCLAMP1211P.TCT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP1211P.TCT, 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 UCLAMP1211P.TCT part is unused and in its original packaging.
Return procedure for UCLAMP1211P.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCLAMP1211P.TCT Tags
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