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Semtech Corporation UCLAMP3301H.THT
- Part No.:
- UCLAMP3301H.THT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
UCLAMP3301H.THT.pdf
- Description:
- TVS DIODE 3.3VWM 8VC SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
UCLAMP3301H.THT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 33V-rated I/O or power lines in USB Type-C, industrial, and IoT systems. It delivers ±30kV IEC 61000-4-2 ESD immunity, clamps at 35.5V (IPP = 40A, tp = 8/20μs), maintains <25mΩ dynamic resistance, and operates from –40°C to +125°C in a through-hole TO-220AB package.
For engineers reviewing the UCLAMP3301H.THT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal stability data, PCB layout guidance, and direct alternatives for 33V bus protection in load switch, USB PD, and industrial equipment designs.
Technical Context
The UCLAMP3301H.THT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 1A–40A peak pulse current due to decreasing RDS(on) under surge conditions.
It supports unsymmetrical line protection per IEC 61000-4-5 with ±1kV (1.2/50μs, RS = 42Ω) rating and meets IEC 61000-4-4 EFT immunity up to ±4kV (5/50ns). Its junction capacitance is 190pF at 33V DC bias, optimized for low-voltage transient suppression without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 33 V - Maximum continuous DC operating voltage before clamping activation; defines safe interface with 33V power rails or USB PD 3.0 extended voltage profiles. |
| Clamping Voltage | 35.5 V at IPP = 40A (tp = 8/20μs) - Limits downstream component stress during lightning surges; stays within 33V system damage thresholds. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - Enables robust handling in manufacturing, field service, and end-user environments without additional shielding. |
| Peak Pulse Current | 40 A (tp = 8/20μs) - Supports compliance with IEC 61000-4-5 Level 4 surge immunity for industrial and outdoor equipment. |
| Dynamic Resistance | 25 mΩ - Ensures minimal voltage rise under surge, enabling stable clamping independent of current magnitude. |
| Junction Capacitance | 190 pF @ VR = 33V, f = 1MHz - Low enough to avoid signal distortion on moderate-speed buses (e.g., USB 2.0, RS-485), but not suitable for >1Gbps differential lanes. |
| Operating Temperature | –40°C to +125°C - Validated performance across automotive under-hood, industrial control cabinet, and outdoor edge-node environments. |
Pinout & Package
UCLAMP3301H.THT is housed in a through-hole TO-220AB package (10.16mm × 8.89mm × 4.45mm) with integral heat sink tab, RoHS-compliant lead finish, and UL 94V-0 molding compound. The package enables high-power dissipation without external heatsinking for short-duration transients.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Tab) | Input / Protected Line | Direct connection point for 33V bus or I/O line; electrically tied to internal FET drain; requires low-inductance trace routing to connector. |
| Pin 2 | Ground | Primary ground return for surge current; must be connected to low-impedance chassis or power plane via shortest possible path. |
| Pin 3 | Ground | Secondary ground terminal; used with Pin 2 to reduce parasitic inductance and improve 40A surge current handling capability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across full 1–40A surge range - eliminates need for overrating IPP to meet voltage safety margins. |
| FET-based shunt topology | RDS(on) drops below 25mΩ under surge - dissipates energy in channel rather than PN junction, improving thermal resilience vs. TVS diodes. |
| High-temperature stability | Clamping voltage drift <1.2% from –40°C to +125°C - enables reliable protection in uncontrolled ambient environments without derating. |
| Unsymmetrical surge rating | ±1kV (1.2/50μs, RS = 42Ω) - matches real-world industrial surge coupling where positive/negative transients differ in amplitude and source impedance. |
| Low leakage | ≤800 nA at 33V - prevents measurable power loss in always-on 33V monitoring circuits or battery-backed systems. |
Applications
| USB Power Delivery Input Protection | Industrial Load Switch Protection |
|---|---|
|
Use Scenario: Protecting the input of a 33V-rated USB PD controller or buck-boost converter during hot-plug events and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the Type-C receptacle, clamping fast-rising EOS before it reaches sensitive silicon. Use Value: Maintains 35.5V clamping at 40A while holding <25mΩ dynamic resistance - prevents latch-up or gate oxide rupture in PD controllers rated for 36V absolute maximum. |
Use Scenario: Safeguarding the VIN pin of high-side load switches (e.g., ON Semiconductor NIS513x) in programmable logic controllers and remote I/O modules. IC Role / Device Role / Timing Role: Primary front-end surge clamp, absorbing 8/20μs transients before they propagate into the switch's internal MOSFET or control circuitry. Use Value: Clamping stability over temperature ensures consistent protection at 85°C ambient - avoids premature shutdown or false OVP triggering in enclosed enclosures. |
| Smart Meter Power Bus Protection | 48V Telecom Equipment Interface |
|
Use Scenario: Shielding the 33V auxiliary supply rail in ANSI C12.19-compliant smart meters exposed to utility grid transients and EFT noise. IC Role / Device Role / Timing Role: Standalone EOS protector on the meter's isolated DC-DC secondary side, coordinated with upstream MOVs and gas discharge tubes. Use Value: ±30kV ESD rating withstands repeated electrostatic discharges during field calibration - extends maintenance intervals and reduces field returns. |
Use Scenario: Protecting 33V bias rails feeding optical transceivers or fan controllers in NEBS-compliant telecom shelves operating at –5V to –48V nominal. IC Role / Device Role / Timing Role: Secondary-level clamp on derived 33V supplies, complementing primary –48V surge protection stages. Use Value: 190pF capacitance avoids resonance with 48V DC-DC output filters - preserves loop stability and prevents oscillation in regulated outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS3311P | Same FET-based TDS architecture, identical 33V working voltage and 35.5V clamping, but in 1.6×1.6mm DFN package - no through-hole mounting or thermal tab. | Used in space-constrained PCBs where board area is prioritized over thermal mass; unsuitable for high-reliability mechanical retention requirements. | Select TDS3311P only if automated SMT assembly and minimal footprint are mandatory; UCLAMP3301H.THT preferred for vibration-prone or serviceable industrial hardware. |
| SM712.TCT | Traditional bipolar TVS array with 33V standoff, 50V clamping at 12A, higher dynamic resistance (>150mΩ), and significant temperature-dependent clamping drift. | Lower cost solution for non-critical 33V lines where 50V clamping is acceptable and ambient temperature stays <70°C. | Choose SM712.TCT only for cost-sensitive consumer-grade products; UCLAMP3301H.THT provides superior clamping consistency and surge margin in mission-critical infrastructure. |
Compared with TDS3311P and SM712.TCT, UCLAMP3301H.THT uniquely combines through-hole mechanical robustness, constant-clamp performance across –40°C to +125°C, and 40A surge capability - making it the only option qualified for industrial load switch inputs requiring both thermal mass and precise voltage limiting.
Availability
UCLAMP3301H.THT is available at Aetrix Electronics and suitable for USB Power Delivery interfaces, industrial load switch inputs, smart meter auxiliary rails, and 48V telecom equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for UCLAMP3301H.THT 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 UCLAMP3301H.THT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered to replace conventional TVS diodes in high-reliability 33V power and interface protection applications demanding stable clamping and wide-temperature operation.
FAQ
What is the maximum continuous operating voltage for UCLAMP3301H.THT?
The UCLAMP3301H.THT has a reverse stand-off voltage (VRWM) of 33 V, meaning it remains non-conductive up to this DC or RMS voltage level under normal operation. This rating aligns with 33V power distribution networks and extended-range USB PD 3.0 implementations. Exceeding 33V triggers clamping action, and sustained overvoltage beyond absolute maximum ratings may cause permanent damage to UCLAMP3301H.THT.
How does UCLAMP3301H.THT achieve constant clamping voltage across varying surge currents?
UCLAMP3301H.THT achieves constant clamping by using a surge-rated FET as its conduction element, controlled by an integrated precision trigger circuit. As surge current rises, the FET's RDS(on) decreases - dropping from ~100mΩ at 1A to <25mΩ at 40A - so the voltage drop (I × R) remains nearly fixed. This results in a clamping voltage of 35.5V across the full 1–40A range, unlike TVS diodes whose VC increases linearly with current.
Can UCLAMP3301H.THT be used for bidirectional protection on a 33V data line?
No - UCLAMP3301H.THT is a unidirectional device intended for protecting positive-polarity power or I/O lines referenced to ground. Its functional diagram shows a single-channel FET shunt from input to GND. For bidirectional signal lines (e.g., RS-485, CAN), a symmetric TVS array or dedicated bidirectional TDS variant would be required; UCLAMP3301H.THT must be paired with complementary protection for negative transients.
What is the recommended PCB layout for optimal surge performance with UCLAMP3301H.THT?
Place UCLAMP3301H.THT within 5 mm of the protected connector, route Pin 1 (tab) directly to the incoming 33V line with a wide, low-inductance trace, and connect Pins 2 and 3 to a solid ground plane using multiple vias. Avoid stubs or right-angle bends. The TO-220AB tab must remain unmasked and soldered to a thermal pad tied to inner-layer ground planes to maximize energy dissipation during 40A transients.
Does UCLAMP3301H.THT meet IEC 61000-4-5 Level 4 surge immunity?
Yes - UCLAMP3301H.THT is rated for 40A peak pulse current with 8/20μs waveform, which satisfies IEC 61000-4-5 Level 4 (4kV line-to-ground, 2kV line-to-line) when used with appropriate series impedance. Its ±1kV unsymmetrical rating (1.2/50μs, RS = 42Ω) further confirms compliance for industrial AC mains-coupled surges. Full system-level testing is still required, but UCLAMP3301H.THT provides the core clamping capability needed to pass.
UCLAMP3301H.THT 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.THT FAQ
1.How can I place an order for UCLAMP3301H.THT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCLAMP3301H.THT 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.THT reliable?
The price and inventory of UCLAMP3301H.THT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCLAMP3301H.THT is usually 5 days.
3.What payment methods are accepted for UCLAMP3301H.THT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCLAMP3301H.THT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCLAMP3301H.THT?
UCLAMP3301H.THT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCLAMP3301H.THT 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.THT?
For technical support, including UCLAMP3301H.THT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCLAMP3301H.THT requirements.
6.How does Aetrix verify that UCLAMP3301H.THT is sourced from the original manufacturer or authorized distributors?
All UCLAMP3301H.THT 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.THT meets industry standards.
7.What is the process for return or replacement of UCLAMP3301H.THT?
All UCLAMP3301H.THT units undergo pre-shipment inspection (PSI). If there is an issue with UCLAMP3301H.THT, 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.THT part is unused and in its original packaging.
Return procedure for UCLAMP3301H.THT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCLAMP3301H.THT Tags
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