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Semtech Corporation SC4624MLTRT
- Part No.:
- SC4624MLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC4624MLTRT.pdf
- Description:
- IC REG BUCK ADJ 4A 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:4,079
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Product details
Overview
SC4624MLTRT 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 24–40A, and 20mΩ dynamic resistance. It protects USB Type-C power delivery buses and load switch inputs in industrial and IoT systems.
For engineers reviewing the SC4624MLTRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.
Technical Context
The SC4624MLTRT 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 24–40A and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and junction capacitance of 175pF at 22V/1MHz. Its 6-pin DFN package integrates three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3) to minimize parasitic inductance and maximize surge current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold 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 behavior and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC power rails and low-speed signal lines; not suitable for >100MHz data paths. |
| Operating Temperature | −40°C to +125°C - supports deployment in automotive-adjacent industrial and outdoor IoT environments. |
Pinout & Package
SC4624MLTRT is housed in a RoHS-compliant, halogen-free DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no internal thermal pad required; energy dissipated in silicon). All six terminals must be connected per layout guidelines to achieve rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Parallel ground terminals - must all be connected to low-inductance ground plane via multiple vias to sustain 40A surge return path. |
| Pins 4, 5, 6 | IN | Parallel input terminals - connect directly to protected line (e.g., VBus in USB-C); all three required for full 40A rating and minimized trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across 24–40A and −40°C to +125°C - eliminates derating uncertainty in thermal or high-current designs. |
| FET-based shunt architecture | Replaces PN-junction TVS with active switching - avoids linear VC = VBR + IPP×RDYN drift and enables lower clamping than comparable TVS. |
| Low dynamic resistance | 20mΩ - reduces voltage overshoot during fast-rising transients and improves energy diversion efficiency. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in motor drives and PLCs. |
| Space-efficient packaging | 1.6mm × 1.6mm DFN-6 - saves >50% board area vs. SO-8 or SOT-23 TVS solutions with similar ratings. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBus lines in USB-C ports supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS shunt protector placed between connector and PD controller or load switch input. Use Value: Maintains 27.5–28V clamping across temperature-prevents overvoltage damage to sensitive PD controllers where conventional TVS would exceed 35V at 125°C. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation equipment. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage seen by the load switch's internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of the load switch during 40A surges by holding clamping voltage well below its absolute maximum rating (typically <30V). |
| IoT Edge Node Power Rail Protection | Storage Device DC Power Bus Protection |
|
Use Scenario: Securing 22V auxiliary power rails in battery-backed or PoE-powered IoT gateways operating in uncontrolled environments. IC Role / Device Role / Timing Role: Standalone EOS protector on main DC input, upstream of DC-DC converters and PMICs. Use Value: Delivers ±30kV ESD and 40A surge capability in minimal footprint-enabling compact, ruggedized edge hardware without external MOVs or bulky TVS arrays. |
Use Scenario: Protecting 22V supply lines feeding NVMe SSD power management ICs or SAS/SATA backplane controllers in enterprise storage enclosures. IC Role / Device Role / Timing Role: High-reliability transient suppressor on primary power rail, co-located with bulk capacitance near connector entry point. Use Value: Ensures stable clamping during hot-swap or cable-insertion transients-avoids data corruption or controller reset caused by rail collapse or overvoltage. |
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 device; SC4624MLTRT is Semtech's alternate orderable part number for TDS2211P - identical electrical specs, package, and marking. | No functional difference; used interchangeably in BOMs and layouts. | Select SC4624MLTRT for tape-and-reel procurement through Aetrix Electronics; verify reel quantity (3,000 pcs) matches production planning. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but only 12A IPP (8/20μs); higher clamping (~33V at 12A); 0.65pF capacitance. | Targeted at CC/SBU lines-not rated for 22V power rail protection; unsuitable for 40A surge scenarios. | Use only for low-capacitance, low-energy signal-line protection; not a substitute for SC4624MLTRT in power rail applications. |
Compared with TDS2211P (identical), SC4624MLTRT offers identical performance and drop-in compatibility; versus uClamp2411ZA, it delivers 3.3× higher surge current rating and 5.5V lower clamping-making it the sole viable option for 22V power rail EOS protection requiring 40A immunity.
Availability
SC4624MLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant surge protection.
Supply support for SC4624MLTRT 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.
The TDS family-including SC4624MLTRT-is engineered specifically for high-energy EOS protection in 12–36V power and interface rails, addressing limitations of traditional TVS diodes in temperature-stable clamping and surge current scalability.
FAQ
What is the exact package type and dimensions of SC4624MLTRT?
SC4624MLTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad (no thermal slug). Pin pitch is 0.5mm, and the land pattern follows Semtech's recommended layout with three parallel IN pins (4–6) and three GND pins (1–3) for low-inductance routing. The device is Pb-free, halogen-free, and RoHS/WEEE compliant.
Does SC4624MLTRT require a thermal pad or heatsink on the PCB?
No, SC4624MLTRT does not require an external thermal pad or heatsink. Unlike TVS diodes that dissipate surge energy in the junction, SC4624MLTRT channels transient current through a low-RDS(on) FET, minimizing localized heating. Energy is dissipated within the silicon die, and the DFN package's thermal resistance is sufficient for single-event surge duty cycles per IEC 61000-4-5.
Can SC4624MLTRT replace a standard 22V TVS diode in an existing design?
SC4624MLTRT can replace a 22V TVS diode only if the PCB layout accommodates its 6-pin DFN footprint and parallel pin configuration. It is not pin-compatible with 2-pin or 3-pin TVS packages. However, its superior clamping stability and 40A rating often justify layout revision-especially where temperature derating or high-surge reliability is critical.
What is the maximum allowable trace length between SC4624MLTRT and the protected connector?
Semtech recommends placing SC4624MLTRT as close as possible to the connector-ideally within 5mm-to minimize inductive voltage overshoot during fast ESD events. Longer traces increase impedance, reducing effective clamping performance. For optimal results, route pins 4–6 and 1–3 with short, wide, direct connections to the protected line and ground plane using multiple vias.
Is SC4624MLTRT suitable for protecting high-speed data lines like USB 3.2 or PCIe?
No, SC4624MLTRT is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity above ~100MHz. It is intended exclusively for DC power rails or low-speed control lines (e.g., USB-C VBus, load switch enable, or industrial sensor power). For data line protection, use low-capacitance devices such as RClamp3371ZC (<0.25pF).
SC4624MLTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 20-VFQFN 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):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ (4x4)
SC4624MLTRT FAQ
1.How can I place an order for SC4624MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4624MLTRT 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 SC4624MLTRT reliable?
The price and inventory of SC4624MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4624MLTRT is usually 5 days.
3.What payment methods are accepted for SC4624MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4624MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4624MLTRT?
SC4624MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4624MLTRT 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 SC4624MLTRT?
For technical support, including SC4624MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4624MLTRT requirements.
6.How does Aetrix verify that SC4624MLTRT is sourced from the original manufacturer or authorized distributors?
All SC4624MLTRT 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 SC4624MLTRT meets industry standards.
7.What is the process for return or replacement of SC4624MLTRT?
All SC4624MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4624MLTRT, 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 SC4624MLTRT part is unused and in its original packaging.
Return procedure for SC4624MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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