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Semtech Corporation SC286ULTRT
- Part No.:
- SC286ULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 28-UFQFN Exposed Pad
- Datasheet:
-
SC286ULTRT.pdf
- Description:
- IC REG BUCK PROG 4A DL 28MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:1,405
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Product details
Overview
SC286ULTRT from Semtech is a transient diverting suppressor designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A (8/20μs) peak pulse current handling, and stable 27.5–28V clamping voltage across temperature and current range - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SC286ULTRT datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (DFN 1.6×1.6×0.55mm, 6-lead), terminal-level circuit roles, real-world clamping stability data, and validated alternatives for 22V bus protection in compact, thermally robust designs.
Technical Context
The SC286ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with guaranteed 22V reverse stand-off voltage, 27.9V typical breakdown, and 175pF junction capacitance at 22V - enabling reliable protection for USB PD, industrial power rails, and load switch inputs without thermal derating penalties or clamping voltage drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of most 24V-rated controllers and load switches. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD requirements. |
| Dynamic Resistance | 20mΩ - enables flat clamping curve and minimal voltage overshoot during fast transients. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for DC power line protection without signal integrity impact. |
| Operating Temp | –40°C to +125°C - supports extended-temperature industrial and automotive-adjacent applications. |
Pinout & Package
SC286ULTRT is housed in a RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals are surface-mount; pins 1–3 are dedicated GND, pins 4–6 are parallel-connected IN terminals - full connection of all three GND and all three IN pins is mandatory for rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; must be low-inductance, multi-via connected to solid ground plane. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBUS or load switch input); all three must be routed together to minimize impedance imbalance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A (8/20μs), eliminating design margin inflation needed with TVS diodes. |
| FET-based shunt topology | Surge energy diverted through low-RDS(on) channel instead of PN-junction, avoiding thermal runaway and enabling stable operation up to +125°C. |
| Ultra-low dynamic resistance | 20mΩ measured between 1A–40A ensures minimal IR drop and predictable voltage limiting during fast-rising surges. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive switching noise in motor drives and PLCs. |
| Space-optimized footprint | 1.6×1.6mm DFN saves >60% board area vs. comparable SOT-23 or SOIC TVS solutions while maintaining 1120W peak power rating. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD negotiation, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed immediately after connector, clamping transients before they reach PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across –40°C to +125°C, preventing false overvoltage shutdowns and ensuring PD compliance at elevated ambient temperatures. |
Use Scenario: Safeguarding enable and input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: High-current shunt protector that limits voltage across load switch FET gate-source and drain-source during surge events. Use Value: Prevents latch-up or permanent damage to internal FETs by holding clamping voltage below 30V - critical where load switch VGS(max) or VDS(max) margins are tight. |
| IoT Edge Node Power Rail Protection | Storage Device DC Input Protection |
|
Use Scenario: Securing 12–24V DC input rails of battery-powered IoT gateways and edge sensors deployed in ungrounded or outdoor environments. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection on main power entry point. Use Value: Delivers ±30kV ESD, ±4kV EFT, and 40A surge capability in one 1.6mm² footprint - reducing BOM count and PCB routing complexity. |
Use Scenario: Protecting SATA or NVMe SSD power inputs against hot-plug transients, connector arcing, and system-level surges in enterprise storage enclosures. IC Role / Device Role / Timing Role: Low-capacitance (175pF), high-power suppressor placed at board-level power entry before bulk capacitance and LDOs. Use Value: Clamps within 28V at full 40A surge without degrading power rail stability or triggering upstream OVP circuits. |
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 (T22XX), manufactured by Semtech - confirmed direct replacement per Semtech ordering documentation. | Same use cases: USB-C PD, load switch input, industrial 22V rails. | Select TDS2211P when sourcing from authorized Semtech channels; identical performance and layout compatibility. |
| SP1003-02JT-D | TVS diode array (SOD-323), 22V working voltage, 30A (8/20μs), higher clamping (~42V at 30A), 25pF typical capacitance - lacks FET-based constant-clamp behavior. | Suitable only for lower-energy ESD-only scenarios; not recommended for 40A surge or high-temp industrial use due to clamping rise and thermal limitations. | Choose SP1003-02JT-D only for cost-sensitive, non-surge-critical consumer ports where 42V clamping is acceptable and temperature range is limited to 0–70°C. |
Compared with TDS2211P and SP1003-02JT-D, SC286ULTRT delivers identical protection performance to TDS2211P in form, fit, and function - including pinout, thermal profile, and clamping stability - while SP1003-02JT-D requires significant derating for industrial temperature and surge compliance.
Availability
SC286ULTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC286ULTRT 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 connectivity - with leadership in transient suppression, LoRa® wireless, and signal integrity solutions.
SC286ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power and interface protection applications where clamping stability and thermal robustness are critical.
FAQ
What is the exact package type and dimensions of SC286ULTRT?
SC286ULTRT uses a DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and no exposed thermal pad. Pin 1 is marked with a laser dot; pins 1–3 are GND, pins 4–6 are parallel-connected IN terminals. This footprint matches Semtech's TDS2211P and is compatible with standard DFN reflow profiles.
Does SC286ULTRT require external bias or control signals to operate?
No, SC286ULTRT is fully passive and self-triggering. It contains an integrated precision trigger circuit and surge-rated FET - no external power, enable pin, or configuration is needed. The device activates automatically when input voltage exceeds its 27.9V breakdown threshold, making SC286ULTRT ideal for always-on protection in safety-critical power paths.
How does SC286ULTRT's clamping voltage compare to standard TVS diodes at high temperature?
At +125°C, SC286ULTRT maintains clamping voltage within 27.5–28V across 24A–40A (8/20μs), whereas typical 22V TVS diodes increase clamping to ~38V at the same conditions. This stability prevents false overvoltage trips in SC286ULTRT-protected USB PD controllers and industrial load switches operating in hot environments.
Can SC286ULTRT be used to protect high-speed data lines like USB SuperSpeed or PCIe?
No - SC286ULTRT has 175pF junction capacitance, optimized for DC or low-frequency power line protection (e.g., VBUS, load switch inputs). For high-speed data lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). SC286ULTRT is intended exclusively for power and robust I/O line protection, not signal integrity-critical paths.
Is SC286ULTRT RoHS and REACH compliant?
Yes, SC286ULTRT is Pb-free, halogen-free, and fully compliant with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Its molding compound meets UL 94V-0 flammability rating, and lead finish is matte tin - confirmed in Semtech's official datasheet Rev 2.5 and material declarations.
SC286ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 28-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 4A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-MLPQ-UT (4x4)
SC286ULTRT FAQ
1.How can I place an order for SC286ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC286ULTRT 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 SC286ULTRT reliable?
The price and inventory of SC286ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC286ULTRT is usually 5 days.
3.What payment methods are accepted for SC286ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC286ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC286ULTRT?
SC286ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC286ULTRT 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 SC286ULTRT?
For technical support, including SC286ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC286ULTRT requirements.
6.How does Aetrix verify that SC286ULTRT is sourced from the original manufacturer or authorized distributors?
All SC286ULTRT 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 SC286ULTRT meets industry standards.
7.What is the process for return or replacement of SC286ULTRT?
All SC286ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC286ULTRT, 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 SC286ULTRT part is unused and in its original packaging.
Return procedure for SC286ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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