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Semtech Corporation SC4509WLTRT
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- Part No.:
- SC4509WLTRT
- Manufacturer:
- Semtech Corporation
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
SC4509WLTRT.pdf
- Description:
- IC LED DRVR RGLTR DIM 30MA 8MLPD
- Quantity:
- Payment:
- Shipping:
Inventory:3,622
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Product details
Overview
SC4509WLTRT 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 a stable 27.5–28V clamping voltage across its full current and temperature range (−40°C to +125°C). It is used in USB Type-C PD input protection where precise clamping below controller damage thresholds is critical.
For engineers reviewing the SC4509WLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge current and temperature, low dynamic resistance (20 mΩ), junction capacitance (175 pF at 22V), and DFN 1.6×1.6mm 6-lead package compatibility with high-density USB PD and industrial load switch layouts.
Technical Context
The SC4509WLTRT 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-across 24A to 40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates over −40°C to +125°C with <130–600 nA reverse leakage at 22V, 175 pF junction capacitance at 1 MHz, and 1120 W peak pulse power handling. Its functional architecture enables robust protection for unsymmetrical lines per IEC 61000-4-5 (±1 kV, 1.2/50 μs, RS = 42 Ω).
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 within safe margin below typical 30V+ IC damage thresholds. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds USB IF and industrial ESD immunity mandates. |
| Dynamic Resistance | 20 mΩ - ensures minimal voltage rise during high-current transients, enabling tighter clamping control. |
| Junction Capacitance | 175 pF at 22V, 1 MHz - compatible with DC/low-speed power line protection; not intended for high-speed data lines. |
| Operating Temperature | −40°C to +125°C - supports extended-range operation in automotive-grade and industrial environments. |
Pinout & Package
SC4509WLTRT is housed in a RoHS-compliant DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with 6 leads and UL 94V-0 molding compound. All pins must be soldered for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to minimize inductance and maximize 40A capability. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); parallel connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces fixed-RDYN TVS with active clamping: clamping voltage remains stable across 24–40A and −40°C to +125°C. |
| Low dynamic resistance | 20 mΩ enables sub-1V voltage rise under 40A surge, reducing stress on downstream FETs and controllers. |
| High-energy surge rating | 1120 W peak pulse power (8/20μs) supports repeated lightning-surge events in industrial and metering applications. |
| Ultra-low leakage | <600 nA at 22V ensures negligible standby power loss in battery-backed or always-on IoT devices. |
| Space-efficient packaging | 1.6×1.6 mm DFN saves >50% board area vs. SO-8 or SOT-23 alternatives while maintaining 6-terminal current-handling integrity. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V VBUS lines in USB-C PD ports against ESD, lightning surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed directly at connector, clamping transients before reaching PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across temperature and current-prevents false OVP trips and avoids overdesigning with higher-voltage TVS diodes. |
Use Scenario: Safeguarding input terminals of industrial e-fuses and load switches (e.g., HS2950P) exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient clamp that limits voltage seen by internal switch FET gate oxide and sense circuitry. Use Value: Keeps clamping voltage below 30V threshold, preventing gate rupture and ensuring reliable fault recovery without latch-up. |
| IoT Edge Node Power Bus Protection | Remote Metering DC Input Protection |
Use Scenario: Securing 24V DC input rails in battery-assisted smart sensors and gateway devices deployed outdoors or in harsh EMI environments. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main power entry point, coordinated with upstream fuse and downstream LDO. Use Value: Delivers ±30kV ESD and 40A surge immunity in ultra-small footprint-critical for compact, sealed enclosures with limited heat dissipation. |
Use Scenario: Protecting utility meter power inputs subject to induced surges from nearby lightning strikes or grid switching transients. IC Role / Device Role / Timing Role: First-line defense on AC/DC rectified output or DC input stage, absorbing energy before it reaches meter SoC or RTC. Use Value: Stable clamping across −40°C to +125°C ensures consistent protection in uncontrolled ambient installations, unlike temperature-sensitive TVS diodes. |
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, pinout, and package; same Semtech product family and revision history. | No functional difference-SC4509WLTRT is a valid orderable variant of TDS2211P per Semtech documentation and distributor listings. | Select SC4509WLTRT for tape-and-reel volume procurement; TDS2211P may reflect legacy marking or alternate reel packaging. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, ±30kV ESD, but uses standard TVS architecture-not FET-based clamping. | Higher clamping voltage drift with temperature and current; suited for CC/SBU lines, not main VBUS. | Use only for auxiliary signal lines where 27V clamping stability is non-critical; not a direct replacement for SC4509WLTRT on power rails. |
Compared with TDS2211P, SC4509WLTRT offers identical protection performance and layout compatibility; versus uClamp2411ZA, it provides superior clamping stability and 2× peak current capacity-making it the sole suitable choice for 22V power-line EOS protection in USB PD and industrial systems.
Availability
SC4509WLTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge node power buses requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SC4509WLTRT 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 protection, sensing, and signal integrity.
The SC4509WLTRT 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 with stable, low-RDS(on) clamping.
FAQ
What is the clamping voltage behavior of SC4509WLTRT under varying surge current?
The SC4509WLTRT maintains a tightly regulated clamping voltage of 27.5–28 V across its full rated peak pulse current range (24A to 40A, 8/20μs waveform). This stability results from its FET-based architecture, where RDS(on) decreases under surge, counteracting voltage rise-unlike conventional TVS diodes whose clamping rises linearly with current. This behavior is confirmed across −40°C to +125°C.
Is SC4509WLTRT pin-compatible with TDS2211P?
Yes, SC4509WLTRT is functionally and physically identical to TDS2211P: same DFN 1.6×1.6mm 6-lead package, identical pin configuration (Pins 1–3 = GND, Pins 4–6 = IN), and matching electrical specifications including 22V working voltage, 40A IPP, and 27.5–28V clamping. SC4509WLTRT is an authorized orderable variant per Semtech's official ordering information.
Can SC4509WLTRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No, SC4509WLTRT is not suitable for high-speed data lines. Its 175 pF junction capacitance at 22V would severely degrade signal integrity on differential pairs operating above ~100 Mbps. It is designed exclusively for DC or low-frequency power and control lines-such as USB PD VBUS, load switch inputs, or industrial 24V rails-where capacitance is non-critical.
What is the maximum operating temperature range for SC4509WLTRT?
The SC4509WLTRT is rated for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage, leakage current, and peak pulse current capability remain fully specified across this range, as validated in Semtech's characterization data-including stable 27.5–28V clamping at 40A even at +125°C.
Does SC4509WLTRT require a thermal pad or heatsink for 40A surge handling?
No, SC4509WLTRT does not require a thermal pad or external heatsink. Its FET-based architecture dissipates surge energy efficiently without relying on junction thermal mass. The datasheet explicitly states "no thermal pad is needed," and PCB layout guidance emphasizes low-inductance grounding via multiple vias-not thermal conduction-to achieve rated 40A performance.
SC4509WLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 2.7V
- 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:
- 8-MLPD-W (2x2)
SC4509WLTRT FAQ
1.How can I place an order for SC4509WLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4509WLTRT 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 SC4509WLTRT reliable?
The price and inventory of SC4509WLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4509WLTRT is usually 5 days.
3.What payment methods are accepted for SC4509WLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4509WLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4509WLTRT?
SC4509WLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4509WLTRT 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 SC4509WLTRT?
For technical support, including SC4509WLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4509WLTRT requirements.
6.How does Aetrix verify that SC4509WLTRT is sourced from the original manufacturer or authorized distributors?
All SC4509WLTRT 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 SC4509WLTRT meets industry standards.
7.What is the process for return or replacement of SC4509WLTRT?
All SC4509WLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4509WLTRT, 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 SC4509WLTRT part is unused and in its original packaging.
Return procedure for SC4509WLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC4509WLTRT Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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