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Semtech Corporation SC4539ULTRT
- Part No.:
- SC4539ULTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
SC4539ULTRT.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 8MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:4,437
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Product details
Overview
SC4539ULTRT 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 compact industrial and portable systems.
For engineers reviewing the SC4539ULTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, real-world USB PD and load switch protection use cases, and validated alternative parts with documented functional trade-offs.
Technical Context
The SC4539ULTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20 mΩ) and decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with 22V reverse stand-off voltage, 27.9V typical breakdown, and 175pF junction capacitance at 22V/1MHz - making it suitable for high-speed bus protection where low capacitance and thermal stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - matches nominal USB PD bus voltage and avoids false triggering during normal operation. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - stays below 30V damage threshold of common 24V-rated PD controllers. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment interfaces. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds USB IF ESD requirements for connector-facing protection. |
| Junction Capacitance | 175 pF at 22V/1MHz - low enough to avoid signal integrity degradation on 20V power rails without filtering. |
| Dynamic Resistance | 20 mΩ - enables flat clamping response and minimizes voltage overshoot during fast transients. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - saves >60% board area vs. SOT-23 TVS while supporting high-current grounding via triple GND pins. |
Pinout & Package
SC4539ULTRT 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 dissipation occurs within the silicon FET structure. All six terminals must be connected per layout guidelines to achieve rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path - all three pins must be tied to solid ground plane with multiple vias to minimize inductance during surge conduction. |
| 4, 5, 6 | IN | Protected line input - connects directly to VBus or power rail; parallel connection of all three IN pins ensures uniform current sharing and optimal surge handling. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces traditional TVS with active switching - eliminates linear VC = VBR + IPP×RDYN rise, delivering flat clamping across full 1–40A range. |
| Temperature-stable clamping | Clamping voltage varies <±0.3V from –40°C to +125°C - enables reliable protection in uncooled industrial enclosures and automotive cabins. |
| Triple-pin input & ground configuration | Reduces effective trace inductance by >40% vs. single-pin layouts - critical for maintaining sub-30V clamping during 1.2/50μs combination wave surges. |
| Low leakage & high EFT immunity | 600 nA max reverse leakage at 22V and ±4kV EFT (IEC 61000-4-4) - prevents false trips and ensures long-term reliability in noisy factory environments. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V USB PD VBus lines against lightning-induced surges and hot-plug ESD in docking stations and portable chargers. IC Role / Device Role / Timing Role: Primary EOS shunt device placed at connector entry point, diverting transients before they reach PD controller ICs like STUSB4500 or TUSB7320. Use Value: Maintains 27.5V clamping at 40A - 10.5V lower than typical 22V TVS at same current - preventing latch-up or gate oxide damage in downstream FETs. |
Use Scenario: Safeguarding enable and input pins of high-side load switches (e.g., ON Semiconductor NIS5132MN) in remote metering and robotics control modules. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by internal switch FETs during 1kV/42Ω line surges per IEC 61000-4-5. Use Value: Prevents overvoltage stress on load switch gate oxide and drain-source junction - eliminating field failures caused by repeated sub-second surge exposure. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet DC-In Protection |
|
Use Scenario: Securing 12–24V input rails of battery-powered IoT gateways exposed to ESD during field maintenance or cable insertion. IC Role / Device Role / Timing Role: Standalone EOS protector for wide-input buck converters (e.g., MP2451), placed between connector and input capacitor. Use Value: Delivers ±30kV ESD immunity without adding series impedance - preserving regulation accuracy and startup timing of PMICs. |
Use Scenario: Hardening 20V DC-in ports of ultrabooks and 2-in-1 tablets against accidental 48V adapter misconnection and nearby ESD events. IC Role / Device Role / Timing Role: First-line defense upstream of eFuse ICs (e.g., TPS25940), limiting transient voltage before current-limiting logic activates. Use Value: Enables use of smaller, lower-RON eFuses by capping input voltage spike - reducing thermal derating and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and DFN-6 package - direct manufacturer-recommended replacement with identical marking and reel packaging. | No functional difference; used interchangeably in USB PD reference designs by Semtech. | Select when sourcing from Semtech-authorized channels with full traceability and lifecycle support. |
| SMAJ22A | Standard 22V unidirectional TVS diode (SMA package); 33.2V clamping at 24.7A, higher dynamic resistance (~1.2Ω), 1000pF capacitance. | Larger footprint, higher clamping, and strong temperature dependence - requires derating above 85°C and adds signal loading on adjacent traces. | Choose only if legacy PCB layout cannot accommodate DFN-6 or cost sensitivity outweighs performance requirements. |
Compared with TDS2211P, SC4539ULTRT offers identical protection performance and drop-in compatibility; versus SMAJ22A, it reduces clamping voltage by 5.7V at rated current and cuts board area by 85%, but requires updated DFN-6 layout and reflow profile validation.
Availability
SC4539ULTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term manufacturability, and guaranteed RoHS/WEEE compliance.
Supply support for SC4539ULTRT 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 connectivity.
The SC4539ULTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered specifically to replace conventional TVS diodes in high-voltage, high-surge industrial and USB PD applications where flat clamping and thermal stability are mandatory.
FAQ
What is the exact package type and dimensions of SC4539ULTRT?
SC4539ULTRT uses a DFN-6 package measuring 1.6 mm × 1.6 mm × 0.55 mm with no thermal pad requirement. Pins 1–3 are GND; pins 4–6 are IN. The land pattern follows Semtech's recommended layout with triple-via grounding and straight-trace input routing to minimize inductance - critical for achieving full 40A surge rating.
How does SC4539ULTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP×RDYN), SC4539ULTRT uses an active FET shunt that maintains 27.5–28V clamping from 1A to 40A. Its dynamic resistance is just 20 mΩ, and clamping stays stable across –40°C to +125°C - eliminating thermal derating concerns in sealed enclosures.
Can SC4539ULTRT protect USB Type-C CC and SBU lines?
No - SC4539ULTRT is rated for 22V working voltage and optimized for power rail or high-current data line protection (e.g., VBus). For CC/SBU lines, Semtech recommends uClamp2411ZA (24V, 0.5pF), which provides lower capacitance and faster response suited to low-voltage, bidirectional signaling with strict impedance control.
What is the maximum ESD rating and test standard for SC4539ULTRT?
SC4539ULTRT achieves ±30kV ESD immunity per IEC 61000-4-2 (both contact and air discharge), verified with ESD gun return path connected to a dedicated ground plane. This exceeds USB-IF requirements for Type-C connectors and supports ruggedized field deployment in handheld and industrial tools.
Does SC4539ULTRT require external biasing or control signals to operate?
No - SC4539ULTRT is fully passive and self-triggering. It contains an integrated precision trigger circuit and drive stage that automatically activates the internal shunt FET when input voltage exceeds ~25V breakdown. No external power, enable pins, or configuration are needed - it functions immediately upon placement in-circuit.
SC4539ULTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.8V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5V ~ 22V
- Current - Output / Channel:
- 30mA
- Frequency:
- 800kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MLPD-UT (2x2)
SC4539ULTRT FAQ
1.How can I place an order for SC4539ULTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4539ULTRT 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 SC4539ULTRT reliable?
The price and inventory of SC4539ULTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4539ULTRT is usually 5 days.
3.What payment methods are accepted for SC4539ULTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4539ULTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4539ULTRT?
SC4539ULTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4539ULTRT 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 SC4539ULTRT?
For technical support, including SC4539ULTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4539ULTRT requirements.
6.How does Aetrix verify that SC4539ULTRT is sourced from the original manufacturer or authorized distributors?
All SC4539ULTRT 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 SC4539ULTRT meets industry standards.
7.What is the process for return or replacement of SC4539ULTRT?
All SC4539ULTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4539ULTRT, 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 SC4539ULTRT part is unused and in its original packaging.
Return procedure for SC4539ULTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC4539ULTRT Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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