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Semtech Corporation SC284ULTRT
- Part No.:
- SC284ULTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC284ULTRT.pdf
- Description:
- IC REG BUCK PROG 1.8A DL 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:5,998
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Product details
Overview
SC284ULTRT 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 peak pulse current (8/20μs), and stable 27.5–28V clamping across temperature and current range. It protects USB Type-C power delivery buses, load switch inputs, and industrial interfaces where low, flat clamping voltage is critical to avoid controller damage.
For engineers reviewing the SC284ULTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and two validated alternative surge protectors with documented functional trade-offs.
Technical Context
The SC284ULTRT 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 - not linearly increasing - due to the FET's decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with <20 mΩ dynamic resistance, 175 pF junction capacitance at 22V, and reverse leakage below 600 nA. Its architecture enables stable 27.5–28V clamping at both 24A and 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), making it suitable for high-reliability industrial and USB PD applications where thermal derating compromises standard TVS performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - matches nominal USB PD bus and industrial 24V rail systems without derating. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - stays flat across full surge range, protecting downstream ICs with tight VMAX margins. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD requirements without external staging. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - low enough for DC power rails and medium-speed control lines; not for >100 Mbps data lanes. |
| Dynamic Resistance | 20 mΩ - ensures minimal IR drop during surge, preserving clamping stability and reducing thermal stress. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - enables ultra-compact placement near connectors with minimal PCB area. |
Pinout & Package
SC284ULTRT is housed in a Pb-free, RoHS-compliant DFN-6 package (1.6 mm × 1.6 mm × 0.55 mm) with exposed thermal pad not required - energy is dissipated in the FET channel, not the junction. All six terminals must be connected per layout guidelines to achieve rated 40A surge capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be tied to solid ground plane via multiple vias to minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBus, load switch VIN); all three pins are internally paralleled and must be shorted externally for full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces traditional TVS with active clamping: clamping voltage stays flat vs. current/temperature, unlike VBR + IPP×RDYN behavior. |
| Stable clamping over temperature | 27.5–28 V maintained from –40°C to +125°C - eliminates thermal derating calculations needed for silicon TVS diodes. |
| High-energy surge handling | 1120 W peak pulse power (8/20μs) supports industrial lightning surge standards without cascaded protection stages. |
| Low dynamic resistance | 20 mΩ ensures minimal voltage overshoot during fast-rising transients and reduces self-heating under repeated surges. |
| Compact DFN footprint | 1.6 mm × 1.6 mm saves >60% board space vs. SOT-23 or SOIC alternatives while maintaining 40A rating. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V USB PD power bus against ESD, lightning-induced surges, and connector hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between Type-C connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping at full 40A surge - well below typical PD controller 30V absolute max - even at 125°C ambient. |
Use Scenario: Safeguarding high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways against line transients. IC Role / Device Role / Timing Role: Front-end transient clamp preventing overvoltage damage to internal FET gate oxide and control circuitry. Use Value: Clamps before internal OVP triggers, avoiding false shutdowns and enabling robust operation in ungrounded or floating installations. |
| Industrial 24V Rail Protection | Tablet/Notebook DC Power Input Protection |
Use Scenario: Securing 24V auxiliary power rails in PLCs, HMIs, and factory automation controllers against IEC 61000-4-5 surges. IC Role / Device Role / Timing Role: Single-device solution replacing multi-stage TVS+MOV designs for compact, repeatable surge response. Use Value: Delivers 40A surge handling in 1.6 mm² footprint with no thermal pad or heatsinking - simplifies thermal design and layout. |
Use Scenario: Protecting battery charging inputs and system power rails in portable computing devices subject to user-handling ESD and adapter transients. IC Role / Device Role / Timing Role: Low-capacitance (175 pF), low-leakage (≤600 nA) front-end clamp minimizing standby power impact. Use Value: Enables compliance with IEC 61000-4-2 Level 4 (±30 kV) without compromising battery life or requiring additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P.C | Identical electrical specs, same DFN-6 package, identical marking (T22), and shared Semtech datasheet - confirmed pin-to-pin and functionally equivalent. | No difference; used interchangeably in USB PD and industrial designs per Semtech ordering documentation. | Select TDS2211P.C when sourcing from authorized distributors with full traceability and tape-and-reel packaging (3,000 pcs/reel). |
| TPD2E007DRYR | Lower 7V working voltage, 12A IPP, ±15kV ESD - smaller 1.0 × 0.8 mm DFN-6 but unsuitable for 22V systems. | Limited to low-voltage data lines (I²C, GPIO); cannot replace SC284ULTRT on power rails or USB PD VBus. | Choose only for sub-10V signal line protection where board space is more constrained than voltage rating. |
Compared with TDS2211P.C (identical replacement) and TPD2E007DRYR (low-voltage alternative), SC284ULTRT delivers unique 22V-rated, 40A-capable protection with flat clamping - essential for USB PD and industrial 24V systems where higher-voltage alternatives are non-negotiable.
Availability
SC284ULTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and 24V rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SC284ULTRT 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 semiconductors for power management, protection, sensing, and RF applications.
The SC284ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) family, engineered specifically to replace conventional TVS diodes in high-reliability power-line protection where flat clamping, temperature stability, and high surge current are mandatory.
FAQ
What is the maximum operating temperature for SC284ULTRT?
The SC284ULTRT is rated for continuous operation from –40°C to +125°C ambient. Its clamping voltage remains stable across this full range - 27.5–28V at 40A - with no derating required, unlike standard TVS diodes whose clamping rises significantly above 85°C. This makes SC284ULTRT ideal for under-hood automotive modules or sealed industrial enclosures.
Does SC284ULTRT require a thermal pad on the PCB?
No, SC284ULTRT does not require a thermal pad. Its FET-based architecture dissipates surge energy in the channel rather than the PN junction, eliminating the need for thermal vias or copper pour under the package. Layout guidelines emphasize low-inductance grounding (multiple vias to solid plane) and direct trace routing from connector to pins 4–6, not thermal management.
Can SC284ULTRT be used on USB SuperSpeed differential pairs?
No, SC284ULTRT is not suitable for USB SuperSpeed (5 Gbps) differential lines. With 175 pF junction capacitance, it would severely degrade signal integrity. For SSTX+/SSTX– and SSRX+/SSRX– lines, Semtech recommends low-capacitance TVS devices like RClamp3371ZC (<0.25 pF). SC284ULTRT is intended for VBus, CC, SBU, or load switch power inputs only.
How does SC284ULTRT differ from a standard TVS diode in clamping behavior?
Standard TVS diodes exhibit linear clamping rise: VC = VBR + IPP × RDYN. SC284ULTRT uses an active FET shunt, so its clamping stays flat - 27.5–28V from 1A to 40A - because RDS(on) decreases under surge. This eliminates uncertainty in worst-case clamping at high current or elevated temperature, a key advantage in USB PD and industrial designs.
Is SC284ULTRT compatible with lead-free reflow processes?
Yes, SC284ULTRT is fully compatible with standard lead-free reflow profiles (J-STD-020). Its DFN-6 package uses lead-free terminal finish and UL 94V-0 molding compound. The device has been qualified for MSL-1 rating with unlimited floor life when stored per J-STD-033, and withstands peak reflow temperatures up to 260°C for 30 seconds.
SC284ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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:
- 1.8A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ-UT (3x3)
SC284ULTRT FAQ
1.How can I place an order for SC284ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC284ULTRT 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 SC284ULTRT reliable?
The price and inventory of SC284ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC284ULTRT is usually 5 days.
3.What payment methods are accepted for SC284ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC284ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC284ULTRT?
SC284ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC284ULTRT 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 SC284ULTRT?
For technical support, including SC284ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC284ULTRT requirements.
6.How does Aetrix verify that SC284ULTRT is sourced from the original manufacturer or authorized distributors?
All SC284ULTRT 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 SC284ULTRT meets industry standards.
7.What is the process for return or replacement of SC284ULTRT?
All SC284ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC284ULTRT, 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 SC284ULTRT part is unused and in its original packaging.
Return procedure for SC284ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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