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Semtech Corporation SC4620MLTRT
- Part No.:
- SC4620MLTRT
- Manufacturer:
- Semtech Corporation
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SC4620MLTRT.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:3,150
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Product details
Overview
SC4620MLTRT 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 SC4620MLTRT 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 direct alternatives for 22V bus protection design.
Technical Context
The SC4620MLTRT 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 reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and junction capacitance of 175pF at 22V/1MHz. Its 6-pin DFN (1.6×1.6×0.55mm) integrates three parallel input terminals (Pins 4–6) and three ground terminals (Pins 1–3), requiring all six pins to be connected for full 40A rating and minimal parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave, RS=2Ω) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD applications. |
| ESD Withstand | ±30kV contact & air per IEC 61000-4-2 - exceeds automotive and industrial ESD requirements without derating. |
| Dynamic Resistance | 20mΩ - enables flat clamping response; reduces voltage overshoot compared to TVS diodes with fixed RDYN >1Ω. |
| Junction Capacitance | 175pF at 22V/1MHz - suitable for low-speed power/data lines (e.g., VBus, CC, SBU); not intended for USB SS or PCIe signal integrity. |
Pinout & Package
SC4620MLTRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. The thermal pad is not required-the device dissipates energy in the FET channel, not the junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to solid ground plane via multiple vias for full 40A surge handling. |
| Pins 4, 5, 6 | IN | Parallel-connected input terminals for protected line (e.g., VBus); all three required to achieve rated clamping performance and minimize trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A range and –40°C to +125°C - eliminates need for derating at high temp or high current. |
| FET-based shunt architecture | Replaces traditional pn-junction TVS with active switching; achieves <0.1Ω effective RDS(on) under surge - lowers clamping vs. passive devices. |
| High-energy surge capability | 1120W peak pulse power (8/20μs) - supports repeated lightning-surge events in industrial and outdoor IoT deployments. |
| Low leakage & stable capacitance | 600nA max IR at 22V; 175pF ±15% over temperature - ensures minimal impact on power rail stability and low-speed signaling. |
Applications
| USB Type-C VBus Protection | Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V USB Power Delivery bus against ESD, lightning surges, and connector hot-plug transients. IC Role / Device Role / Timing Role: Primary EOS suppressor placed between Type-C receptacle and upstream load switch or PD controller. Use Value: Maintains 27.5–28V clamping at 40A and 125°C-prevents latch-up or gate oxide failure in 24V-rated PD controllers where standard TVS would exceed 35V. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) exposed to field wiring surges in remote meters or robotics. IC Role / Device Role / Timing Role: Front-end transient shunt that limits voltage stress on the load switch's internal FET during 1kV/42Ω surge events. Use Value: Enables use of smaller, lower-RDS(on) load switches by holding clamp voltage below their absolute maximum VDS, extending system reliability without adding series impedance. |
| Industrial Equipment Power Rails | IoT Device DC Input Protection |
|
Use Scenario: Securing 24V DC power inputs in programmable logic controllers (PLCs), motor drives, and HMI panels subject to IEC 61000-4-5 surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main supply rail, upstream of DC-DC converters and microcontrollers. Use Value: Delivers 40A surge handling in 1.6×1.6mm footprint-reducing board area by >50% versus SOD-123 or SMA TVS solutions while maintaining sub-28V clamping. |
Use Scenario: Protecting battery-charged or adapter-powered IoT edge nodes (e.g., smart sensors, gateways) from ESD and induced surges in unshielded environments. IC Role / Device Role / Timing Role: Single-component solution for 22V-rated input rails, eliminating need for multi-stage TVS+MOV designs. Use Value: Combines ±30kV ESD, 4kV EFT, and 40A surge protection in one chip-reducing BOM count, test complexity, and failure modes in compact, cost-sensitive designs. |
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), same tape/reel packaging (3,000 pcs/7″ reel). | No functional difference; TDS2211P.C is the official Semtech orderable part number for the same silicon and package as SC4620MLTRT. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors requiring exact manufacturer PN compliance. |
| SP1003-02HTG | 30V working voltage, 30A IPP, 33V clamping at 30A, SOD-323 package (2.7×1.4mm), 25pF capacitance. | Higher clamping voltage and lower surge rating; suited for lower-energy 3.3–5V data lines-not recommended for 22V power rail protection. | Use SP1003-02HTG only for secondary protection or low-capacitance signal lines; not a functional replacement for SC4620MLTRT in VBus or load switch roles. |
Compared with SC4620MLTRT, TDS2211P.C offers identical performance and form factor with full manufacturer traceability, while SP1003-02HTG trades clamping performance and surge rating for smaller size and lower capacitance-making it unsuitable for primary 22V bus protection but viable for auxiliary signal-line hardening.
Availability
SC4620MLTRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial PLC power inputs, and IoT device DC supply protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/WEEE compliance.
Supply support for SC4620MLTRT 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 signal integrity.
The TDS family-including SC4620MLTRT-is engineered specifically for high-reliability EOS protection in power delivery, industrial control, and high-speed interface applications where conventional TVS limitations in clamping stability and temperature drift are unacceptable.
FAQ
What is the maximum continuous operating voltage for SC4620MLTRT?
The SC4620MLTRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can safely block up to 22V DC or RMS voltage continuously without significant leakage or conduction. This makes SC4620MLTRT ideal for protecting 20V USB PD buses and 24V industrial power rails where sustained voltage must remain within safe margins before clamping initiates.
Does SC4620MLTRT require a thermal pad on the PCB?
No, SC4620MLTRT does not require a thermal pad. Unlike traditional TVS diodes that dissipate surge energy in the junction, SC4620MLTRT uses a surge-rated FET whose channel conducts and dissipates energy with minimal temperature rise. The datasheet explicitly states "no thermal pad is needed," and the DFN-6 package relies on low-inductance GND connections (Pins 1–3) for optimal surge handling.
How does SC4620MLTRT differ from standard TVS diodes in clamping behavior?
SC4620MLTRT maintains a nearly constant clamping voltage of 27.5–28V across its full 24–40A surge range and from –40°C to +125°C. Standard TVS diodes exhibit rising clamping (VC = VBR + IPP × RDYN) due to fixed dynamic resistance-often exceeding 35V at high current or temperature. SC4620MLTRT's FET-based architecture avoids this limitation entirely.
Can SC4620MLTRT be used on USB SuperSpeed differential pairs?
No, SC4620MLTRT is not suitable for USB SuperSpeed (SS) TX/RX lines. Its 175pF junction capacitance would severely degrade signal integrity at 5–10 Gbps. SC4620MLTRT is intended for low-speed, high-energy paths like VBus, CC, SBU, or power rails. For SS lines, Semtech recommends ultra-low-capacitance devices such as RClamp3371ZC (<0.25pF).
What is the recommended PCB layout for SC4620MLTRT to achieve full 40A rating?
To achieve the full 40A rating, all three IN pins (4–6) must be connected via a single short, wide trace to the protected line, and all three GND pins (1–3) must connect to a solid ground plane using ≥3 vias. SC4620MLTRT must be placed within 5mm of the connector, with minimal loop area-per Semtech's layout guidelines-to reduce parasitic inductance and ensure fast, low-overshoot clamping response.
SC4620MLTRT 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:
- 2.5A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ (4x4)
SC4620MLTRT FAQ
1.How can I place an order for SC4620MLTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4620MLTRT 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 SC4620MLTRT reliable?
The price and inventory of SC4620MLTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4620MLTRT is usually 5 days.
3.What payment methods are accepted for SC4620MLTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4620MLTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4620MLTRT?
SC4620MLTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4620MLTRT 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 SC4620MLTRT?
For technical support, including SC4620MLTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4620MLTRT requirements.
6.How does Aetrix verify that SC4620MLTRT is sourced from the original manufacturer or authorized distributors?
All SC4620MLTRT 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 SC4620MLTRT meets industry standards.
7.What is the process for return or replacement of SC4620MLTRT?
All SC4620MLTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4620MLTRT, 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 SC4620MLTRT part is unused and in its original packaging.
Return procedure for SC4620MLTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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