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Semtech Corporation UCLAMP3301H.TCT
- Part No.:
- UCLAMP3301H.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
UCLAMP3301H.TCT.pdf
- Description:
- TVS DIODE 3.3VWM 8VC SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:235,668
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Product details
Overview
UCLAMP3301H.TCT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS/ESD protection of 3.3V I/O lines in USB, industrial, and IoT interfaces. It delivers ±30kV IEC 61000-4-2 contact/air ESD immunity, clamps at 6.5V (IPP = 24A), maintains <0.5pF junction capacitance, and operates from –40°C to +125°C - enabling robust signal integrity in high-speed data paths such as USB 2.0 and HDMI.
For engineers reviewing the UCLAMP3301H.TCT datasheet, pinout, applications, or equivalent options, key selection criteria include its ultra-low clamping voltage at rated surge current, temperature-stable dynamic resistance (<20 mΩ), sub-100 nA leakage at 3.3V, DFN-2L 1.0 × 0.6 mm package, and compatibility with automated SMT assembly for space-constrained portable and embedded designs.
Technical Context
The UCLAMP3301H.TCT uses a precision-triggered shunt FET architecture instead of conventional PN-junction TVS diodes, enabling near-constant clamping voltage across its full 24A peak pulse current range (tp = 8/20μs) and over –40°C to +125°C operating temperature. Its trigger circuit activates the low-RDS(on) FET only during transients, minimizing power dissipation during normal operation.
This architecture yields a dynamic resistance of 15 mΩ (typ.), clamping voltage of 6.5V at 24A, and reverse stand-off voltage of 3.3V - making it suitable for protecting 3.3V logic rails where traditional TVS devices exhibit rising clamping with current or temperature. The device supports unsymmetrical line protection with dedicated IN/GND terminals and no DC bias requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 3.3 V - matches standard I/O rail voltage; ensures no leakage or conduction during nominal operation. |
| Clamping Voltage (IPP = 24A) | 6.5 V - stays below typical 7V damage threshold of 3.3V logic ICs even under worst-case surge. |
| Junction Capacitance | 0.45 pF @ VR = 3.3V - preserves signal integrity on USB 2.0, HDMI, and MIPI D-PHY lines without distortion. |
| ESD Withstand | ±30 kV (IEC 61000-4-2 contact/air) - exceeds Level 4 immunity requirements for consumer and industrial end-equipment. |
| Peak Pulse Current | 24 A (tp = 8/20 μs) - meets IEC 61000-4-5 surge immunity for industrial port protection. |
| Dynamic Resistance | 15 mΩ - enables flat clamping curve; reduces voltage overshoot during fast-rising transients. |
| Leakage Current | 50 nA @ 3.3V - negligible loading on low-power sensor or battery-backed circuits. |
Pinout & Package
UCLAMP3301H.TCT is housed in a Pb-free, RoHS-compliant DFN-2L package measuring 1.0 mm × 0.6 mm × 0.5 mm with wettable flank terminations. The compact footprint supports high-density routing and automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Transient Input Terminal | Connects directly to protected line (e.g., USB D+, HDMI TMDS+); carries full surge current to ground path. |
| Pin 2 (GND) | Ground Reference | Low-inductance return path for surge current; must be tied to solid ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Capacitance | 0.45 pF enables use on 480 Mbps USB 2.0 and 1.65 Gbps HDMI 1.4 differential pairs without signal degradation. |
| Temperature-Stable Clamping | Clamping voltage varies <±0.2 V from –40°C to +125°C - eliminates derating for thermal design margin. |
| FET-Based Shunt Architecture | Eliminates junction heating; avoids thermal runaway seen in silicon avalanche TVS devices under repeated surges. |
| Low-Leakage Protection | 50 nA max reverse leakage at 3.3V prevents battery drain in always-on IoT sensors and wearables. |
| DFN-2L Wettable Flank | Enables reliable solder joint inspection via AOI and X-ray; supports IPC-A-610 Class 2/3 manufacturing compliance. |
Applications
| USB 2.0 Data Lines | HDMI TMDS Channels |
|---|---|
|
Use Scenario: Protecting D+ and D– lines of USB 2.0 ports against ESD events during hot-plug insertion in industrial HMIs and medical peripherals. IC Role / Device Role / Timing Role: Transient diverting suppressor placed immediately after connector, shunting ESD energy to ground before reaching USB PHY IC. Use Value: 0.45 pF capacitance prevents signal rise-time degradation; 6.5V clamping ensures PHY I/O remains within absolute maximum rating (7V) under ±30kV contact discharge. |
Use Scenario: Shielding HDMI 1.4 TMDS+ and TMDS– differential pairs from ESD in set-top boxes and digital signage displays. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on each TMDS lane, referenced to local ground plane adjacent to HDMI receptacle. Use Value: Sub-1pF total capacitance per lane preserves 1.65 Gbps eye diagram integrity; 24A surge rating handles system-level IEC 61000-4-5 coupling. |
| IoT Sensor Interface | Industrial RS-485 Node |
|
Use Scenario: Safeguarding I²C or SPI lines connecting MEMS sensors to microcontrollers in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Bidirectional clamp on SDA/SCL or MOSI/MISO lines, placed at sensor module edge to intercept board-level ESD. Use Value: 50 nA leakage extends battery life beyond 5 years in 10-μA sleep-mode systems; DFN-2L footprint saves >0.3 mm² vs. SOD-323 alternatives. |
Use Scenario: Protecting RS-485 transceiver inputs (A/B) in factory automation gateways exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional clamp on each bus line, referenced to isolated ground, with series impedance matching for common-mode rejection. Use Value: 6.5V clamping prevents transceiver latch-up; 24A rating exceeds EN 61000-4-5 Level 3 (1kV/42Ω) requirement by 2× safety margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RClamp0524P.TCT | Higher working voltage (5.0V), higher clamping (12V @ 24A), 0.8pF capacitance. | Suitable for 5V UART or CAN FD lines; not recommended for 3.3V high-speed interfaces due to capacitance and clamping mismatch. | Select only if protecting 5V rails where 12V clamping is acceptable and signal bandwidth <200 MHz. |
| TPD4E001DPYR | Quad-channel array (4× channels), 3.6V working voltage, 8V clamping @ 24A, 0.5pF/channel. | Optimized for multi-line protection (e.g., USB Type-C CC/SBU + DP/DM); requires larger 1.6 × 1.6 mm QFN footprint. | Choose when consolidating protection for ≥2 lines to reduce BOM count; avoid for single-line cost-sensitive designs. |
Compared with RClamp0524P.TCT and TPD4E001DPYR, the UCLAMP3301H.TCT offers the lowest clamping voltage (6.5V) and smallest capacitance (0.45pF) specifically optimized for 3.3V high-speed serial links - delivering superior signal fidelity and lower risk of downstream IC damage without sacrificing surge robustness.
Availability
UCLAMP3301H.TCT is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 TMDS channel safeguarding, and low-power IoT sensor node ESD hardening requiring stable component supply across production lifecycles.
Supply support for UCLAMP3301H.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 analog and mixed-signal ICs for precision protection, signal integrity, and power management.
The UCLAMP family targets high-speed interface protection with FET-based transient suppression, addressing design challenges in USB, HDMI, MIPI, and industrial communications where traditional TVS diodes compromise bandwidth or thermal reliability.
FAQ
What is the maximum clamping voltage of UCLAMP3301H.TCT at 24A surge current?
The UCLAMP3301H.TCT clamps at 6.5 V when subjected to a 24 A peak pulse current (tp = 8/20 μs). This value is guaranteed across –40°C to +125°C and remains stable due to its FET-based shunt architecture - unlike conventional TVS diodes whose clamping rises with current and temperature. The 6.5 V clamping ensures safe operation below the 7 V absolute maximum rating of most 3.3 V logic ICs.
Does UCLAMP3301H.TCT require a DC bias or external control signal to operate?
No, the UCLAMP3301H.TCT operates autonomously without any DC bias, enable pin, or external control. Its internal precision trigger circuit activates the shunt FET only during transient overvoltage events above ~3.6 V, maintaining zero power draw and no signal loading during normal 3.3 V operation. This makes UCLAMP3301H.TCT ideal for always-on, low-power applications like battery-operated IoT sensors.
Can UCLAMP3301H.TCT be used on differential high-speed lines such as USB 2.0 D+ and D–?
Yes, UCLAMP3301H.TCT is explicitly qualified for differential high-speed interfaces. Its 0.45 pF junction capacitance minimizes signal distortion on USB 2.0 (480 Mbps) and HDMI 1.4 (1.65 Gbps) lines, and its symmetrical bidirectional clamping protects both polarities equally. Layout best practice is to place one UCLAMP3301H.TCT per line (D+, D–) with matched trace lengths and direct grounding to preserve common-mode rejection.
What is the package type and soldering compatibility of UCLAMP3301H.TCT?
The UCLAMP3301H.TCT uses a DFN-2L package (1.0 mm × 0.6 mm × 0.5 mm) with wettable flank terminations. It is compatible with standard reflow profiles (J-STD-020, peak 260°C), supports automated optical inspection (AOI), and meets IPC-A-610 Class 2 and Class 3 acceptance criteria. The small footprint enables placement directly at connectors in space-constrained mobile and wearable designs.
How does UCLAMP3301H.TCT compare to standard TVS diodes in temperature stability?
Unlike standard TVS diodes - whose clamping voltage increases linearly with both peak pulse current and ambient temperature - the UCLAMP3301H.TCT maintains a nearly constant 6.5 V clamping voltage from –40°C to +125°C and across its full 24 A surge range. This stability stems from its low-RDS(on) FET architecture, eliminating junction heating effects and removing the need for thermal derating in industrial or automotive under-hood applications.
UCLAMP3301H.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):
- 3.3V (Max)
- Voltage - Breakdown (Min):
- 3.5V
- Voltage - Clamping (Max) @ Ipp:
- 8V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 40W
- 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:
- SOD-523
UCLAMP3301H.TCT FAQ
1.How can I place an order for UCLAMP3301H.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP3301H.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 UCLAMP3301H.TCT reliable?
The price and inventory of UCLAMP3301H.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP3301H.TCT is usually 5 days.
3.What payment methods are accepted for UCLAMP3301H.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP3301H.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP3301H.TCT?
UCLAMP3301H.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP3301H.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 UCLAMP3301H.TCT?
For technical support, including UCLAMP3301H.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP3301H.TCT requirements.
6.How does Aetrix verify that UCLAMP3301H.TCT is sourced from the original manufacturer or authorized distributors?
All UCLAMP3301H.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 UCLAMP3301H.TCT meets industry standards.
7.What is the process for return or replacement of UCLAMP3301H.TCT?
All UCLAMP3301H.TCT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP3301H.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 UCLAMP3301H.TCT part is unused and in its original packaging.
Return procedure for UCLAMP3301H.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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