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Semtech Corporation SC185LULTRT
- Part No.:
- SC185LULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
SC185LULTRT.pdf
- Description:
- IC REG BUCK 2.5V 4A 16MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,898
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Product details
Overview
SC185LULTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines. It delivers ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range - enabling robust USB Type-C PD bus protection in industrial and mobile systems.
For engineers reviewing the SC185LULTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge, low dynamic resistance (20mΩ), junction capacitance (175pF at 22V), and DFN 1.6×1.6mm 6-lead package compatibility with high-density USB PD and load switch input layouts.
Technical Context
The SC185LULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under increasing current - eliminating linear VC = VBR + IPP × RDYN dependency.
It operates over –40°C to +125°C, maintains ≤600nA reverse leakage at 22V, and achieves 1120W peak pulse power handling. Its functional architecture isolates protection path from signal path, supporting single-line protection without compromising data integrity on adjacent traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD bus nominal voltage up to 20V and withstand margin, preventing false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays within safe margin below typical 30V+ damage thresholds of USB PD controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment and USB PD endpoints. |
| Dynamic Resistance | 20mΩ - enables minimal voltage rise under surge, critical for maintaining low clamping across full current range. |
| Junction Capacitance | 175pF at 22V, 1MHz - compatible with DC power rails and low-speed control lines; not intended for high-speed data lanes. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity requirements without external shielding. |
| Operating Temp | –40°C to +125°C - supports deployment in extended-temperature environments including industrial edge nodes and automotive infotainment power domains. |
Pinout & Package
SC185LULTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with UL 94V-0 molding compound. All six terminals are surface-mount; no thermal pad required - energy dissipation occurs internally via FET conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus or power rail; parallel connection ensures uniform current distribution during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Architecture | FET-based shunt delivers flat 27.5–28V clamping from 1A to 40A - eliminates design margin inflation needed with traditional TVS devices. |
| Low Dynamic Resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces IR drop under surge, preserving downstream voltage integrity. |
| High-Temp Stability | Clamping voltage unchanged from –40°C to +125°C - removes thermal derating calculations for industrial ambient conditions. |
| Compact Footprint | 1.6mm × 1.6mm DFN - saves >60% board area vs. SOT-23 or SOIC alternatives while maintaining 40A surge rating. |
| Robust EFT Immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive fast transients in motor drives and PLC I/O modules. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V VBus lines in USB-C PD ports against lightning-induced surges and connector ESD events. IC Role / Device Role / Timing Role: Primary EOS suppressor placed between connector and PD controller or buck converter input. Use Value: Maintains 28V clamping at 40A and 125°C - prevents latch-up or gate oxide damage in PD controllers that lack internal overvoltage tolerance. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., HS2950P) in remote meters and robotics power stages. IC Role / Device Role / Timing Role: Front-end transient clamp limiting voltage seen by internal FET gate oxide and overvoltage protection circuitry. Use Value: Keeps clamping voltage below 30V threshold of typical load switch OVP comparators - avoids false shutdown or permanent gate damage. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet DC Power Input Protection |
|
Use Scenario: Securing 12–24V DC input rails in battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone surge diverter on main system input, upstream of PMIC or LDO regulators. Use Value: Delivers 1120W peak pulse power handling in 1.6mm² footprint - enables compact, certified surge protection without external MOVs or gas tubes. |
Use Scenario: Protecting adapter-input power paths in thin-client notebooks and detachable tablets operating from 20V USB-C chargers. IC Role / Device Role / Timing Role: Single-device solution for IEC 61000-4-5 compliance on main DC input before buck converter stage. Use Value: Eliminates need for multi-stage TVS + capacitor filtering - simplifies layout and reduces BOM count while meeting EN 61000-4-5 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Identical electrical specs, same DFN 1.6×1.6mm package, identical pinout and marking - direct manufacturer-recommended replacement. | Same use cases: USB-C PD, load switch input, industrial 22V rails. | SC185LULTRT is Semtech's rebranded production variant of TDS2211P; fully interchangeable with no layout or firmware changes. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 32V clamping, smaller 0.6×0.3mm 2-pin DFN package. | Better suited for CC/SBU lines in USB-C; insufficient for 40A VBus protection. | Select uClamp2411ZA only for auxiliary signal lines - not a substitute for SC185LULTRT on main power rails. |
Compared with TDS2211P, SC185LULTRT offers identical performance and form factor as a production-grade variant; compared with uClamp2411ZA, it provides 67% higher surge current rating and 4V lower clamping - making it suitable for primary power rail protection where uClamp2411ZA would fail under IEC 61000-4-5 testing.
Availability
SC185LULTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SC185LULTRT 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.
SC185LULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered to replace conventional TVS diodes in high-energy EOS applications demanding stable clamping, wide temperature operation, and minimal board space.
FAQ
What is the maximum clamping voltage of SC185LULTRT at 40A surge current?
The SC185LULTRT clamps at 27.6–28V under 40A peak pulse current (tp = 1.2/50μs voltage + 8/20μs current combination waveform, RS = 2Ω). This value is guaranteed across –40°C to +125°C and reflects its FET-based architecture - unlike TVS diodes, clamping does not increase with current or temperature. The SC185LULTRT datasheet specifies this as a design-critical parameter for protecting 22V-system components.
Is SC185LULTRT pin-compatible with TDS2211P?
Yes - SC185LULTRT shares identical pin configuration, package dimensions (DFN 1.6×1.6mm), and terminal assignment with TDS2211P: pins 1–3 are GND, pins 4–6 are IN. Both parts use the same land pattern and PCB layout guidelines. SC185LULTRT is Semtech's production-marked variant of TDS2211P, with no electrical or mechanical differences affecting board-level integration.
Can SC185LULTRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No - SC185LULTRT has 175pF junction capacitance at 22V, which is too high for differential high-speed data lanes (e.g., USB 3.x, PCIe, DisplayPort) where <0.3pF is typically required. It is intended exclusively for DC power rails and low-speed control lines. For SuperSpeed lanes, Semtech recommends RClamp3371ZC (0.18pF); SC185LULTRT must be placed only on VBus or enable inputs.
What is the reverse leakage current of SC185LULTRT at 22V and 85°C?
At 22V reverse stand-off voltage and +85°C, SC185LULTRT exhibits ≤600nA reverse leakage current - consistent with its specified max of 600nA at 25°C and 22V. The device's leakage increases only modestly with temperature, remaining well below 1μA across its full operating range, ensuring minimal quiescent power loss in always-on industrial systems using SC185LULTRT.
Does SC185LULTRT require a thermal pad or heatsink for 40A surge handling?
No - SC185LULTRT dissipates surge energy internally through its surge-rated FET and requires no external thermal pad, heatsink, or copper pour beyond standard PCB ground plane connections. Its DFN package relies on low-inductance GND pin connections (pins 1–3) and short trace routing to the protected line (pins 4–6); thermal pad omission is confirmed in Semtech's layout guidelines and absolute maximum ratings table for SC185LULTRT.
SC185LULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 16-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 4A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MLPQ-UT (3x3)
SC185LULTRT FAQ
1.How can I place an order for SC185LULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC185LULTRT 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 SC185LULTRT reliable?
The price and inventory of SC185LULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC185LULTRT is usually 5 days.
3.What payment methods are accepted for SC185LULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC185LULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC185LULTRT?
SC185LULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC185LULTRT 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 SC185LULTRT?
For technical support, including SC185LULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC185LULTRT requirements.
6.How does Aetrix verify that SC185LULTRT is sourced from the original manufacturer or authorized distributors?
All SC185LULTRT 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 SC185LULTRT meets industry standards.
7.What is the process for return or replacement of SC185LULTRT?
All SC185LULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC185LULTRT, 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 SC185LULTRT part is unused and in its original packaging.
Return procedure for SC185LULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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