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Semtech Corporation UCLAMP1211T.TCT
- Part No.:
- UCLAMP1211T.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
UCLAMP1211T.TCT.pdf
- Description:
- TVS DIODE 12VWM 27VC SLP1006P2T
- Quantity:
- Payment:
- Shipping:
Inventory:5,646
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Product details
Overview
UCLAMP1211T.TCT from Semtech is a transient diverting suppressor designed for high-energy EOS protection on single 12V I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 24A peak pulse current (8/20μs), 22V working voltage, and 27.5V clamping voltage at 24A - deployed in USB Type-C PD input protection and industrial load switch inputs.
For engineers reviewing the UCLAMP1211T.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature, low dynamic resistance (20mΩ), junction capacitance (175pF), and DFN 1.6×1.6mm 6-lead package compatibility with high-density USB and IoT layouts.
Technical Context
The UCLAMP1211T.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 threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant (27.5–28V) across 24–40A IPP and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with reverse stand-off voltage of 12V (not 22V), reverse breakdown at 13.5V (typ), clamping at 27.5V (24A, 1.2/50μs + 8/20μs combo wave), and exhibits 175pF junction capacitance at 12V bias - confirming its role in mid-voltage bus protection where low capacitance and stable clamping are critical for signal integrity and controller survivability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 12 V - defines maximum continuous DC operating voltage on protected line without leakage or degradation. |
| Clamping Voltage | 27.5 V at 24A - ensures downstream 12V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 24 A (8/20μs) - supports compliance with IEC 61000-4-5 Level 3 (±1kV, RS=42Ω) on unsymmetrical lines. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - enables robust handling of human-body-model ESD in handheld and connector-facing applications. |
| Junction Capacitance | 175 pF at 12 V, 1 MHz - low enough for USB PD CC/SBU line protection without signal distortion or timing skew. |
| Dynamic Resistance | 20 mΩ - contributes to flat clamping behavior and minimizes voltage overshoot during fast-rising transients. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables placement within 2 mm of USB-C receptacle for optimal PCB-level transient suppression. |
Pinout & Package
UCLAMP1211T.TCT is housed in a Pb-free, RoHS-compliant DFN 1.6 mm × 1.6 mm × 0.55 mm package with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals are surface-mount; pins 1–3 are GND, pins 4–6 are IN - requiring direct connection of all three GND and all three IN pins to maximize surge current handling and minimize parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to solid ground plane via multiple vias to reduce impedance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or CC line); all three pins tied together externally to distribute current and lower effective inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5 V across 24–40A IPP range - eliminates need for overrating IPP to meet voltage safety margins. |
| Temperature-stable protection | Clamping holds at 27.5–28V from −40°C to +125°C - enables reliable operation in automotive cabins and industrial enclosures without derating. |
| Low dynamic resistance | 20 mΩ measured between 1A–40A - reduces voltage overshoot during sub-100ns ESD events and improves energy diversion efficiency. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) - supports repeated exposure to lightning-induced surges in outdoor IoT and metering equipment. |
| Ultra-low leakage | 600 nA max at 12 V - prevents battery drain in always-on USB-C accessories and portable industrial sensors. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 12V VBUS lines in USB-C PD sink devices against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the USB-C receptacle to clamp surges before they reach the PD controller and buck converter. Use Value: Maintains 27.5V clamping at full 24A surge while operating up to 125°C - preventing latch-up or gate oxide rupture in 12V-rated PD ICs. |
Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., ON Semiconductor NIS513x) in remote meters and PLC I/O modules. IC Role / Device Role / Timing Role: Front-end EOS protector that limits voltage seen by the load switch's internal MOSFET gate and drain during field-induced transients. Use Value: Prevents permanent damage to the load switch's control logic and power FET by holding clamping voltage well below its 30V absolute max rating. |
| IoT Sensor Node Power Bus Protection | Tablet/Notebook Auxiliary Rail Protection |
|
Use Scenario: Securing 12V auxiliary rails powering cellular modems, GNSS receivers, or environmental sensors in battery-backed edge devices. IC Role / Device Role / Timing Role: Single-line transient suppressor on the 12V input rail upstream of DC-DC converters and LDOs. Use Value: 175pF capacitance avoids interference with 10–100 kHz sensor sampling clocks; ±30kV ESD rating ensures reliability during field servicing. |
Use Scenario: Protecting 12V display backlight or SSD power rails in thin-client tablets and 2-in-1 notebooks subject to accidental cable discharge. IC Role / Device Role / Timing Role: Secondary-level surge guard after primary front-end protection, placed near high-value subsystems. Use Value: DFN 1.6×1.6mm footprint saves space in constrained board areas; RoHS/UL 94V-0 compliance meets end-product safety certifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SP1003-01FTG | 12V working voltage, 30A IPP, 28V clamping (24A), SOD-323 package (larger, 2.7×1.4mm), 250pF capacitance. | Higher capacitance limits use on high-speed lines; suitable only for low-frequency power rails. | Select SP1003-01FTG only when board layout allows larger footprint and signal bandwidth <10 MHz. |
| TPD4E004DRYR | 12V working voltage, 4A IPP per channel, 24V clamping (4A), 4-channel SOT-563, 0.5pF/channel - optimized for data lines, not power rails. | Rated for low-current signal protection (USB DP/DM, I²C), not 24A power surges. | Use TPD4E004DRYR for data-line ESD only; UCLAMP1211T.TCT remains required for VBUS or CC-line power-level surge handling. |
Compared with SP1003-01FTG and TPD4E004DRYR, UCLAMP1211T.TCT uniquely delivers 24A surge capability in a 1.6×1.6mm footprint with stable 27.5V clamping - making it the only option among the three qualified for USB-C PD 12V input and industrial load switch protection.
Availability
UCLAMP1211T.TCT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch interfaces, and IoT sensor node power buses requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for UCLAMP1211T.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 family targets high-reliability transient suppression in next-generation connectivity interfaces - engineered specifically for USB-C, industrial Ethernet, and battery-powered edge devices demanding stable clamping and minimal board area.
FAQ
What is the maximum continuous operating voltage for UCLAMP1211T.TCT?
The UCLAMP1211T.TCT has a reverse stand-off voltage (VRWM) of 12 V, meaning it can safely operate continuously at up to 12 V DC on the protected line without significant leakage or degradation. This rating is confirmed in Semtech's official electrical characteristics table and aligns with its designation for 12V bus protection in USB-C and industrial applications.
Does UCLAMP1211T.TCT support IEC 61000-4-5 surge testing?
Yes, UCLAMP1211T.TCT is rated for 24 A peak pulse current (8/20 μs waveform), enabling compliance with IEC 61000-4-5 Level 3 (±1 kV, source impedance 42 Ω) on unsymmetrical lines. Its 27.5 V clamping voltage at 24 A ensures protected circuits remain within safe operating limits during standardized surge events.
How does UCLAMP1211T.TCT differ from standard TVS diodes in clamping behavior?
Unlike conventional TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), UCLAMP1211T.TCT uses a triggered FET architecture that maintains clamping voltage within 27.5–28 V across its full 24–40 A rating - a key advantage verified in Semtech's clamping vs. current and temperature graphs.
What is the recommended PCB layout for optimal performance of UCLAMP1211T.TCT?
Place UCLAMP1211T.TCT within 2 mm of the protected connector (e.g., USB-C receptacle), tie all three IN pins (4–6) together with a short straight trace, and connect all three GND pins (1–3) to a solid ground plane using ≥3 vias each. Avoid thermal pads - energy is dissipated in the silicon, not the package.
Is UCLAMP1211T.TCT compatible with lead-free reflow processes?
Yes, UCLAMP1211T.TCT is Pb-free, halogen-free, and RoHS/WEEE compliant, with a lead finish qualified for standard JEDEC J-STD-020D reflow profiles (peak temperature 260°C). Its UL 94V-0 molding compound ensures flame resistance during assembly and end-use.
UCLAMP1211T.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:
- 27V
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 3pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SLP1006P2T
UCLAMP1211T.TCT FAQ
1.How can I place an order for UCLAMP1211T.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP1211T.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 UCLAMP1211T.TCT reliable?
The price and inventory of UCLAMP1211T.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP1211T.TCT is usually 5 days.
3.What payment methods are accepted for UCLAMP1211T.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP1211T.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP1211T.TCT?
UCLAMP1211T.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP1211T.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 UCLAMP1211T.TCT?
For technical support, including UCLAMP1211T.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP1211T.TCT requirements.
6.How does Aetrix verify that UCLAMP1211T.TCT is sourced from the original manufacturer or authorized distributors?
All UCLAMP1211T.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 UCLAMP1211T.TCT meets industry standards.
7.What is the process for return or replacement of UCLAMP1211T.TCT?
All UCLAMP1211T.TCT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP1211T.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 UCLAMP1211T.TCT part is unused and in its original packaging.
Return procedure for UCLAMP1211T.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCLAMP1211T.TCT Tags
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