My Inquiry
My Account
Semtech Corporation UCLAMP1201H.TCT
- Part No.:
- UCLAMP1201H.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
UCLAMP1201H.TCT.pdf
- Description:
- TVS DIODE 12VWM 25VC SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:78,457
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCLAMP1201H.TCT from Semtech is a transient diverting suppressor (TDS) designed for single-line 12V EOS/ESD protection in high-reliability I/O and power bus applications. It delivers ±30kV IEC 61000-4-2 ESD immunity, clamps at 13.5V (IPP = 24A), maintains <20mΩ dynamic resistance, and operates from –40°C to +125°C in a 1.6mm × 1.6mm DFN-6 package.
For engineers reviewing the UCLAMP1201H.TCT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal stability data, PCB layout guidance, and direct alternatives for USB Type-C, load switch input, industrial IoT, and 12V rail protection designs.
Technical Context
The UCLAMP1201H.TCT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that initiates conduction when transient voltage exceeds the breakdown threshold. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across the full rated peak pulse current range due to the FET's decreasing RDS(on) under surge conditions.
It supports unsymmetrical line protection per IEC 61000-4-5 with ±1kV (1.2/50μs, RS = 42Ω) and handles 24A (8/20μs) peak pulse current while maintaining 13.5V clamping. Its 175pF junction capacitance at 12V reverse bias and 600nA leakage at VRWM ensure minimal signal distortion on protected lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 12 V - Maximum continuous DC operating voltage on protected line without device activation |
| Clamping Voltage | 13.5 V at IPP = 24 A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - Ensures downstream 12V logic or power switches remain below damage threshold during surge |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - Meets highest industrial and consumer ESD immunity requirements without degradation |
| Peak Pulse Current | 24 A (tp = 8/20μs) - Sustains high-energy transients typical of lightning-induced surges in industrial and automotive environments |
| Dynamic Resistance | 20 mΩ - Enables stable clamping independent of current magnitude, critical for predictable overvoltage protection |
| Junction Capacitance | 175 pF at VR = 12 V, f = 1 MHz - Low enough for USB 2.0 and industrial control signal integrity; not suitable for USB 3.x or PCIe |
| Operating Temp | –40°C to +125°C - Fully specified performance across full industrial temperature range without derating |
Pinout & Package
UCLAMP1201H.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 are surface-mount; no thermal pad required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to maximize current handling and minimize inductance |
| 4, 5, 6 | IN | Protected line input; tied together internally and externally to handle full surge current across parallel bond wires and package leads |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient diversion | Replaces traditional TVS diode with low-RDS(on) shunt FET, enabling flat clamping vs. current and temperature |
| Constant clamping voltage | 13.5 V clamping maintained from 1A to 24A surge and across –40°C to +125°C ambient |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 5 kHz & 100 kHz bursts) - protects against repetitive switching noise in motor drives and PLCs |
| Low leakage & capacitance | 600 nA max IR at 12 V and 175 pF at 12 V - preserves signal rise time and reduces standby power loss |
| Small-footprint DFN | 1.6 mm × 1.6 mm area - saves >50% board space versus SO-8 or SOT-23 TVS solutions with comparable ratings |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting the VBUS line of a USB Type-C port supporting up to 20V PD negotiation, exposed to ESD events and system-level surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at connector, shunting EOS energy to ground before reaching PD controller or load switch. Use Value: Clamps at 13.5V regardless of temperature or surge amplitude, preventing latch-up or gate oxide damage in 12V-rated PD controllers and e-fuses. |
Use Scenario: Safeguarding the input of an industrial-grade load switch (e.g., TPS229xx, AP22653) powering sensors or actuators in remote meters or robotics. IC Role / Device Role / Timing Role: Primary front-end surge clamp, absorbing 24A transients while holding voltage below the switch's absolute maximum VIN rating. Use Value: Prevents internal FET avalanche failure and ensures reliable hot-swap operation under repeated 1.2/50μs surges common in factory automation and field-deployed equipment. |
| IoT Sensor Node Power Rail Protection | 12V Industrial Control Signal Line Protection |
|
Use Scenario: Securing the 12V supply rail of battery-backed or PoE-powered edge nodes in smart building or agricultural monitoring systems. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge immunity on unregulated input, eliminating need for multi-stage protection. Use Value: Enables compact, certified Class B EMC design with only one external component-no series impedance or filtering needed upstream. |
Use Scenario: Protecting analog or digital control lines (e.g., 0–10V, 4–20mA loop drivers, RS-485 bias rails) operating from a shared 12V supply in PLC backplanes or HMI panels. IC Role / Device Role / Timing Role: Low-capacitance shunt protector placed at line entry point, guarding against coupling from adjacent high-noise traces or relay coil flyback. Use Value: 175pF capacitance avoids signal attenuation or timing skew on 100kHz control signals; 600nA leakage prevents drift in precision analog circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCLAMP2401H.TCT | 24V working voltage, 27V clamping at 24A, higher VRWM and VBR | Designed for 24V industrial buses (e.g., CAN FD, 24V PLC I/O); not suitable for 12V logic interfaces | Select UCLAMP2401H.TCT only when protecting lines with nominal 24V operation and ≥20V damage thresholds. |
| TDS1211P | Same 12V VRWM, but 13.2V clamping at 24A and 150pF capacitance; DFN-6 footprint identical | Optimized for lower-capacitance USB 2.0 and audio lines; slightly tighter clamping tolerance | TDS1211P offers marginally better signal fidelity where sub-150pF is critical; UCLAMP1201H.TCT preferred for higher surge robustness in power rails. |
Compared with UCLAMP1201H.TCT, UCLAMP2401H.TCT shifts protection to higher voltage rails while TDS1211P trades minor clamping reduction for lower capacitance-neither is pin-compatible nor drop-in; both require validation of VRWM, clamping, and layout constraints for the target 12V application.
Availability
UCLAMP1201H.TCT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, IoT sensor node power rails, and 12V control signal lines requiring stable component supply across extended temperature and surge stress conditions.
Supply support for UCLAMP1201H.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 belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes with FET-based architecture for flat-clamp, temperature-stable, high-current surge protection in industrial, computing, and USB infrastructure.
FAQ
What is the maximum continuous operating voltage for UCLAMP1201H.TCT?
The UCLAMP1201H.TCT has a reverse stand-off voltage (VRWM) of 12 V, meaning it remains non-conductive and fully functional up to 12 V DC or RMS AC on the protected line. Exceeding this voltage risks premature activation or accelerated wear. This rating is validated across –40°C to +125°C and forms the basis for its use in 12V power rails and I/O interfaces.
How does UCLAMP1201H.TCT achieve stable clamping voltage across temperature?
UCLAMP1201H.TCT achieves stable clamping by using a surge-rated FET whose on-resistance drops as current increases, counteracting the positive temperature coefficient of the trigger circuit. As a result, clamping voltage stays at 13.5 V from –40°C to +125°C at 24A-unlike TVS diodes whose clamping rises with temperature. This behavior is confirmed in Figure 3 of the official datasheet.
Can UCLAMP1201H.TCT be used on high-speed data lines like USB 3.2 or PCIe?
No. UCLAMP1201H.TCT has 175 pF junction capacitance at 12 V reverse bias, which introduces excessive signal loading and insertion loss on high-speed differential pairs. It is appropriate for USB 2.0, UART, I²C, and 12V power/control lines-but not for SuperSpeed (5 Gbps+) or PCIe Gen3+ links, where sub-0.3 pF devices like RClamp3371ZC are required.
What is the recommended PCB layout for optimal surge performance of UCLAMP1201H.TCT?
Place UCLAMP1201H.TCT within 2 mm of the protected connector. Connect all three IN pins (4, 5, 6) via a single short, wide trace to the protected line, and tie all three GND pins (1, 2, 3) directly to a solid ground plane using ≥3 vias. Avoid stubs or splits-this minimizes parasitic inductance and ensures full 24A surge current sharing across internal bond wires.
Is UCLAMP1201H.TCT compliant with RoHS and halogen-free standards?
Yes. UCLAMP1201H.TCT is Pb-free, halogen-free, and compliant with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU. Its molding compound meets UL 94V-0 flammability rating, and lead finish is 100% matte tin. Full compliance documentation is available in Semtech's material declarations and packaging specs.
UCLAMP1201H.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SC-79, SOD-523
- Series:
- uClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 25V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 60pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
UCLAMP1201H.TCT FAQ
1.How can I place an order for UCLAMP1201H.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP1201H.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 UCLAMP1201H.TCT reliable?
The price and inventory of UCLAMP1201H.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP1201H.TCT is usually 5 days.
3.What payment methods are accepted for UCLAMP1201H.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP1201H.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP1201H.TCT?
UCLAMP1201H.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP1201H.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 UCLAMP1201H.TCT?
For technical support, including UCLAMP1201H.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP1201H.TCT requirements.
6.How does Aetrix verify that UCLAMP1201H.TCT is sourced from the original manufacturer or authorized distributors?
All UCLAMP1201H.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 UCLAMP1201H.TCT meets industry standards.
7.What is the process for return or replacement of UCLAMP1201H.TCT?
All UCLAMP1201H.TCT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP1201H.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 UCLAMP1201H.TCT part is unused and in its original packaging.
Return procedure for UCLAMP1201H.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCLAMP1201H.TCT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
