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Semtech Corporation SC4509SKTRT
- Part No.:
- SC4509SKTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- SOT-23-6
- Datasheet:
-
SC4509SKTRT.pdf
- Description:
- IC LED DRV RGLTR PWM SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,574
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Product details
Overview
SC4509SKTRT 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), 27.5–28V clamping voltage at 24–40A, <20mΩ dynamic resistance, and 175pF junction capacitance in a DFN 1.6×1.6×0.55mm package - deployed in USB Type-C PD input protection.
For engineers reviewing the SC4509SKTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low RDYN for minimal voltage overshoot, DFN6 board-space efficiency, and compatibility with industrial surge standards (±1kV, 1.2/50μs + 8/20μs).
Technical Context
The SC4509SKTRT 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 (27.5–28V) from 24A to 40A due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and reverse leakage ≤600nA at 22V. Its functional architecture separates trigger threshold (VBR) from clamping level, enabling stable protection for voltage-sensitive PD controllers and load switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or degradation. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave) - ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds during surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds standard USB interface ESD robustness requirements. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces. |
Pinout & Package
SC4509SKTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad not required (energy dissipated in silicon). All pins must be connected for full 40A rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be soldered to minimize inductance and maximize current handling. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB-C); parallel connection ensures uniform current sharing and optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A surge range - eliminates design margin inflation needed with conventional TVS. |
| Temperature-stable protection | Clamping remains ~27.5–28V from –40°C to +125°C - enables reliable operation in industrial and automotive-adjacent environments. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during fast-rising transients like ESD. |
| High-energy EOS capability | 1120W peak pulse power (8/20μs) - supports protection of 22V systems against lightning-induced surges per IEC 61000-4-5. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C ports supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Primary EOS shunt device placed directly at connector, diverting surge energy to GND before reaching PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents false OVP trips and ensures PD controller survival under ±1kV surge events. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage stress on internal FET gate oxide and drain-source junction. Use Value: Clamps below 28V even at 125°C - avoids latch-up or permanent damage to load switch during lightning-induced surges. |
| IoT Device Power Rail Protection | Notebook/Tablet 22V System Bus Protection |
Use Scenario: Securing 22V auxiliary rails powering cellular modems or sensor hubs in battery-backed IoT gateways. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection on compact PCBs with space constraints. Use Value: 1.6×1.6mm DFN6 footprint saves >50% board area vs. discrete TVS+capacitor solutions - critical for small-form-factor designs. |
Use Scenario: Protecting 22V system buses in ultrabooks and tablets where thermal management and layout density are critical. IC Role / Device Role / Timing Role: High-reliability clamping element placed near DC-in jack or battery input to absorb coupled transients. Use Value: 175pF capacitance avoids resonance with typical input filter networks - preserves stability of downstream DC-DC converters. |
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 DFN6 package, identical marking code T22 - direct Semtech manufacturing variant with 3,000/reel tape-and-reel packaging. | No functional difference; used interchangeably in production for USB-C and industrial load switch designs. | Select TDS2211P.C when sourcing from authorized Semtech distributors with full traceability and standard reel quantities. |
| SP1003-02HTG | Lower 30A IPP rating, higher 33V clamping at 24A, 12pF capacitance - optimized for data-line protection, not power rail. | Not suitable for 22V VBUS; intended for low-capacitance signal lines (e.g., USB SS lanes), not power inputs. | Choose SP1003-02HTG only for sub-1V signal paths; SC4509SKTRT remains preferred for 22V power rail clamping. |
Compared with TDS2211P.C (identical spec) and SP1003-02HTG (lower IPP, signal-optimized), SC4509SKTRT provides verified 40A/22V power-rail protection with industry-leading clamping stability - making it the optimal choice for USB PD, industrial load switches, and high-reliability 22V systems.
Availability
SC4509SKTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT 22V power rail protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SC4509SKTRT 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.
SC4509SKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-energy EOS applications where clamping stability, temperature resilience, and low dynamic resistance are critical.
FAQ
What is the exact clamping voltage of SC4509SKTRT at 40A surge current?
The SC4509SKTRT clamps at 27.6–28V under 40A peak pulse current (1.2/50μs voltage + 8/20μs current combination waveform, RS = 2Ω), as specified in its Electrical Characteristics table. This value is guaranteed across –40°C to +125°C and reflects its constant-clamp FET-based architecture - not a fixed VBR + IPP×RDYN relationship.
Can SC4509SKTRT be used for protecting USB SuperSpeed differential pairs?
No - SC4509SKTRT is not suitable for USB SuperSpeed (TX/RX) lines. Its 175pF junction capacitance would severely degrade signal integrity. For those lines, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF). SC4509SKTRT is specifically designed for 22V power or single-ended I/O rail protection, such as VBUS or CC/SBU in USB-C.
Does SC4509SKTRT require a thermal pad or heatsink on the PCB?
No - SC4509SKTRT does not require a thermal pad or external heatsink. Its DFN package dissipates surge energy internally via the silicon FET structure, and the datasheet explicitly states "no thermal pad is needed." Layout best practice is to connect all GND pins (1,2,3) and IN pins (4,5,6) with short, wide traces and multiple vias to inner ground planes.
How does SC4509SKTRT differ from standard TVS diodes in surge response?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP×RDYN), SC4509SKTRT uses a triggered FET to achieve near-constant clamping (27.5–28V from 24A to 40A). Its dynamic resistance drops under surge, minimizing voltage overshoot - a key advantage for protecting voltage-tolerant ICs like USB PD controllers.
Is SC4509SKTRT compliant with RoHS and halogen-free standards?
Yes - SC4509SKTRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free. These compliance attributes are confirmed in the Mechanical Characteristics section of the official Semtech datasheet Rev 2.5.
SC4509SKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 2.7V
- Voltage - Supply (Max):
- 10V
- Voltage - Output:
- 20V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SC4509SKTRT FAQ
1.How can I place an order for SC4509SKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4509SKTRT 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 SC4509SKTRT reliable?
The price and inventory of SC4509SKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4509SKTRT is usually 5 days.
3.What payment methods are accepted for SC4509SKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4509SKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4509SKTRT?
SC4509SKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4509SKTRT 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 SC4509SKTRT?
For technical support, including SC4509SKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4509SKTRT requirements.
6.How does Aetrix verify that SC4509SKTRT is sourced from the original manufacturer or authorized distributors?
All SC4509SKTRT 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 SC4509SKTRT meets industry standards.
7.What is the process for return or replacement of SC4509SKTRT?
All SC4509SKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4509SKTRT, 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 SC4509SKTRT part is unused and in its original packaging.
Return procedure for SC4509SKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC4509SKTRT Tags
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