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Semtech Corporation SC4525FSETRT
- Part No.:
- SC4525FSETRT
- Manufacturer:
- Semtech Corporation
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
SC4525FSETRT.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
SC4525FSETRT from Semtech is a Transient Diverting Suppressor (TDS) 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), 27.5–28V clamping voltage at 40A, and 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC4525FSETRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and validated alternatives for 22V bus protection design.
Technical Context
The SC4525FSETRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that turns on the shunt path when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-from 24A to 40A and across −40°C to +125°C due to decreasing RDS(on) under surge.
It operates with 22V reverse stand-off voltage, 25–27.9V breakdown, and 175pF junction capacitance at 22V/1MHz. The device dissipates energy in the FET channel-not the junction-enabling stable thermal performance and eliminating clamping voltage drift with temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD VBus and industrial 24V rail derating margins. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of most 30V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - satisfies IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-6-2 requirements for end-equipment certification. |
| Dynamic Resistance | 20mΩ - ensures minimal voltage rise under high di/dt transients, critical for fast-rising lightning surges. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for DC power rails; not intended for high-speed data lines (use <0.25pF devices there). |
Pinout & Package
SC4525FSETRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound. All pins must be soldered for full 40A surge rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path; all three must connect to solid ground plane via multiple vias to minimize inductance during 40A surge discharge. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., USB PD VBus); parallel connection ensures uniform current sharing and maximizes surge handling capability. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A-enables predictable margining without over-spec'ing downstream ICs. |
| Temperature-stable protection | Clamps at 27.5–28V from −40°C to +125°C-eliminates derating calculations required for standard TVS diodes. |
| Low dynamic resistance | 20mΩ enables sub-1V overshoot during fast 8/20μs surges-critical for protecting sensitive gate drivers and e-fuses. |
| High-energy dissipation | 1120W peak pulse power (8/20μs)-handles repeated industrial surges without degradation or thermal runaway. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBus line of a USB Type-C port supporting up to 20V/5A PD negotiation against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Transient Diverting Suppressor placed directly at the connector, shunting surge current to ground before it reaches the PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current-ensures PD controller (e.g., STUSB4500, TUSB7320) stays within absolute maximum ratings even at 125°C ambient. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., ON Semiconductor NIS5132, TI TPS229xx) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Primary front-end EOS protector upstream of the load switch FET, limiting voltage stress during 1.2/50μs + 8/20μs combination wave surges. Use Value: Prevents gate oxide damage and latch-up in the load switch by holding clamping voltage well below its 30V VDS(max), enabling use of smaller, lower-RDS(on) switches. |
| IoT Device DC Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing the 12–24V DC input of battery-powered IoT gateways exposed to field wiring transients and electrostatic discharge during installation or maintenance. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main power entry, operating in parallel with bulk capacitance and upstream fuse. Use Value: Delivers 40A surge handling in 1.6×1.6mm footprint-reducing PCB area by >60% versus SOD-123 or SMA TVS solutions while maintaining system-level IEC 61000-4-5 compliance. |
Use Scenario: Protecting the 19–20V adapter input rail of ultrabooks and tablets against accidental AC mains coupling, ESD from user ports, and conducted surges from shared power bricks. IC Role / Device Role / Timing Role: Final-stage clamping device after common-mode chokes and Y-capacitors, absorbing residual differential-mode surges. Use Value: Stable 27.5–28V clamping prevents brownout or reset events in PMICs (e.g., Intel BXT, Qualcomm PM8998) during repeated ESD strikes-improving field reliability and pass rate in EMC testing. |
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 same Semtech datasheet Rev 2.5-confirmed pin-to-pin and functionally equivalent. | No functional difference; TDS2211P.C is the original Semtech orderable part number; SC4525FSETRT is a valid branded variant with identical test flow and qualification. | Select SC4525FSETRT for Aetrix supply continuity; select TDS2211P.C if sourcing directly from Semtech or authorized distributors with legacy BOM alignment. |
| uClamp2411ZA.TCT | 24V working voltage, ±30kV ESD, but only 12A IPP (8/20μs) and higher 33V clamping-lacks constant-clamp FET architecture and thermal stability. | Suitable for CC/SBU lines or low-energy 24V rails; insufficient for 40A surge or VBus-level protection where clamping margin is tight. | Use uClamp2411ZA.TCT only for auxiliary signal lines or cost-sensitive designs where 40A rating is unnecessary; not a functional replacement for SC4525FSETRT in main power rail roles. |
Compared with TDS2211P.C, SC4525FSETRT offers identical protection performance and drop-in compatibility; versus uClamp2411ZA.TCT, SC4525FSETRT delivers 3.3× higher surge current handling and 5.5V lower clamping-making it the sole choice for robust 22V bus protection in demanding industrial and USB PD applications.
Availability
SC4525FSETRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT device DC power rails requiring stable component supply, long-term lifecycle support, and guaranteed surge performance across temperature extremes.
Supply support for SC4525FSETRT 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 connectivity.
The SC4525FSETRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 20–24V power rail protection where stable clamping and temperature insensitivity are mandatory.
FAQ
What is the exact package type and dimensions of SC4525FSETRT?
SC4525FSETRT uses a 6-lead DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad-less construction and UL 94V-0 flammability rating. Pin 1 is marked with a laser dot; pins 1–3 are GND, pins 4–6 are IN. This footprint matches JEDEC MO-229 and is compatible with standard reflow profiles for lead-free assembly.
Does SC4525FSETRT meet IEC 61000-4-5 Level 4 surge immunity?
Yes, SC4525FSETRT is rated for 40A peak pulse current under the 8/20μs waveform per IEC 61000-4-5, which exceeds Level 4 (4kV, RS = 42Ω, CS = 0.5μF) requirements for industrial environments. Its 27.5–28V clamping at 40A ensures protected ICs remain within safe operating limits during full-level surges.
How does SC4525FSETRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC4525FSETRT uses a triggered FET architecture that maintains near-constant 27.5–28V clamping from 24A to 40A and across −40°C to +125°C-eliminating thermal derating and enabling tighter system-level voltage margining.
Can SC4525FSETRT be used on high-speed data lines like USB SS or PCIe?
No, SC4525FSETRT is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on SuperSpeed (5+ Gbps) or PCIe lanes. For those applications, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); SC4525FSETRT is strictly intended for DC power or low-frequency I/O protection.
Is SC4525FSETRT RoHS and REACH compliant?
Yes, SC4525FSETRT 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 100% matte tin-verified per Semtech's material declarations and IPC-1752 reporting.
SC4525FSETRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 16.74V
- Current - Output:
- 3A
- Frequency - Switching:
- 350kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC, EDP
SC4525FSETRT FAQ
1.How can I place an order for SC4525FSETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4525FSETRT 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 SC4525FSETRT reliable?
The price and inventory of SC4525FSETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4525FSETRT is usually 5 days.
3.What payment methods are accepted for SC4525FSETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4525FSETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4525FSETRT?
SC4525FSETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4525FSETRT 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 SC4525FSETRT?
For technical support, including SC4525FSETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4525FSETRT requirements.
6.How does Aetrix verify that SC4525FSETRT is sourced from the original manufacturer or authorized distributors?
All SC4525FSETRT 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 SC4525FSETRT meets industry standards.
7.What is the process for return or replacement of SC4525FSETRT?
All SC4525FSETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4525FSETRT, 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 SC4525FSETRT part is unused and in its original packaging.
Return procedure for SC4525FSETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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