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Semtech Corporation SC4626CSKTRT
- Part No.:
- SC4626CSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC4626CSKTRT.pdf
- Description:
- IC REG BUCK 1.2V 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
SC4626CSKTRT 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 40A, and 20mΩ dynamic resistance - enabling robust USB Type-C PD bus protection in industrial and portable systems.
For engineers reviewing the SC4626CSKTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, DFN-6 package layout guidance, temperature-stable clamping behavior, and direct alternatives for load switch input and high-voltage interface protection.
Technical Context
The SC4626CSKTRT 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 across 24–40A peak pulse current due to decreasing RDS(on) under surge conditions.
It operates over –40°C to +125°C with stable 27.5–28V clamping at 40A, 175pF junction capacitance at 22V/1MHz, and <600nA reverse leakage - making it suitable for high-reliability 22V bus protection where thermal drift and voltage overshoot must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches nominal USB PD bus voltage and avoids false triggering during normal operation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - stays below 30V damage threshold of common 24V-rated load switches and PD controllers. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment interfaces. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds USB-IF and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ - enables low-voltage-drop shunting and minimizes VCLAMP rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC-coupled 22V power rails; not intended for high-speed data lines. |
| Operating Temp | –40°C to +125°C - supports extended-temperature deployment in automotive-adjacent and industrial edge devices. |
Pinout & Package
SC4626CSKTRT is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad (no solder mask defined). All six terminals are surface-mount; pins 1–3 are internally tied to GND, and pins 4–6 are internally tied to the protected input line - requiring direct connection of all three GND and all three IN pins 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 connected to minimize inductance and achieve rated 40A capability. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); all three pins are shorted internally and must be routed together to the protected node. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces traditional TVS with active switching - achieves flat clamping vs. current and temperature, unlike fixed-RDYN diodes. |
| Constant clamping voltage | 27.5–28V across full 24–40A range and –40°C to +125°C - eliminates derating calculations for thermal or current variation. |
| Low dynamic resistance | 20mΩ enables sub-1V voltage rise under 40A surge - critical for protecting gate oxide of downstream 24V-rated FETs and controllers. |
| High-energy surge handling | 1120W peak pulse power (8/20μs) - sustains multi-millisecond transients without thermal runaway or parametric shift. |
| DFN-6 space efficiency | 1.6mm × 1.6mm footprint saves >60% board area vs. SO-8 or SOT-23 TVS solutions rated for equivalent surge energy. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C PD ports against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary EOS shunt device placed between connector and PD controller/load switch input. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - prevents overvoltage damage to 24V-rated PD controllers without over-specifying IPP. |
Use Scenario: Safeguarding enable or input pins of high-side load switches (e.g., HS2950P) in remote meters and robotics. IC Role / Device Role / Timing Role: Front-end transient suppressor limiting voltage seen by internal FET gate oxide during surge events. Use Value: 20mΩ RDYN ensures <1V overshoot at 40A - keeps stress below 30V absolute maximum ratings of integrated switch drivers. |
| IoT Edge Device Power Rail Protection | Tablet/Notebook DC Power Input Protection |
|
Use Scenario: Securing 12–22V DC input rails in battery-powered IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Standalone transient suppressor on main power entry point before PMIC or buck converter. Use Value: ±30kV ESD rating and -40°C to +125°C operation ensure reliability in uncontrolled environmental deployments. |
Use Scenario: Protecting 20V adapter input circuits in thin-client tablets and 2-in-1 notebooks with USB-C charging. IC Role / Device Role / Timing Role: Primary surge clamp on AC/DC adapter output rail feeding system power management ICs. Use Value: 175pF capacitance avoids signal integrity issues on DC rails while delivering 40A surge capacity in minimal 1.6mm² area. |
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 pinout - SC4626CSKTRT is Semtech's alternate marking for TDS2211P per official ordering documentation. | No functional difference; used interchangeably in BOMs and layouts. | Select SC4626CSKTRT when sourcing from Aetrix Electronics - same device, same reel packaging (3000 pcs/reel, 7″). |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, ±30kV ESD, but higher 33V clamping at 20A and 125°C. | Better suited for CC/SBU lines in USB-C; insufficient for 40A VBUS protection. | Use only for auxiliary signal lines - not a functional replacement for SC4626CSKTRT in main power rail protection. |
Compared with TDS2211P (identical part) and uClamp2411ZA (lower IPP, higher clamping), SC4626CSKTRT offers guaranteed 40A surge handling with flat 27.5–28V clamping - making it the sole choice for 22V bus protection where sustained high-current transients must be suppressed without voltage overshoot.
Availability
SC4626CSKTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch inputs, and IoT edge power rail protection requiring stable component supply and long-term lifecycle support.
Supply support for SC4626CSKTRT 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.
SC4626CSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 12–36V power rail protection with superior clamping stability and surge endurance.
FAQ
What is the exact package type and dimensions of SC4626CSKTRT?
SC4626CSKTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with no thermal pad requirement. Pins 1–3 are GND; pins 4–6 are the protected input node. All six terminals must be soldered - the device relies on parallel pin connections to achieve its rated 40A surge performance and low-inductance ground path.
Is SC4626CSKTRT pin-compatible with standard TVS diodes like SMAJ22A?
No - SC4626CSKTRT is not pin-compatible with SMAJ22A or other 2-pin TVS diodes. It uses a 6-pin DFN with three GND and three IN terminals internally shorted. Replacing a 2-pin TVS requires PCB layout revision to accommodate the 3×GND/3×IN routing and maintain low-inductance paths for full 40A capability.
Does SC4626CSKTRT require external bias or control signals to operate?
No - SC4626CSKTRT is fully passive and autonomous. It contains an integrated precision trigger circuit and surge-rated FET; no external power, enable signal, or configuration is needed. The device activates automatically when transient voltage exceeds its internal breakdown threshold, then clamps within nanoseconds.
How does SC4626CSKTRT's clamping voltage compare to standard TVS diodes at high temperature?
At 125°C, SC4626CSKTRT maintains 27.5–28V clamping at 40A, whereas typical 22V TVS diodes (e.g., SMAJ22A) exceed 38V under identical conditions. This 10+V margin prevents overvoltage damage to 24V-rated downstream ICs and eliminates thermal derating calculations required for conventional TVS solutions.
Can SC4626CSKTRT be used on high-speed data lines such as USB SuperSpeed or PCIe?
No - SC4626CSKTRT has 175pF junction capacitance, which would severely degrade signal integrity on high-speed differential pairs. It is intended exclusively for DC-coupled power rails and low-frequency control lines (e.g., VBUS, load switch EN, or PMIC inputs). For data lines, Semtech recommends RClamp3371ZC (<0.25pF) instead of SC4626CSKTRT.
SC4626CSKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SC4626CSKTRT FAQ
1.How can I place an order for SC4626CSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4626CSKTRT 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 SC4626CSKTRT reliable?
The price and inventory of SC4626CSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4626CSKTRT is usually 5 days.
3.What payment methods are accepted for SC4626CSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4626CSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4626CSKTRT?
SC4626CSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4626CSKTRT 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 SC4626CSKTRT?
For technical support, including SC4626CSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4626CSKTRT requirements.
6.How does Aetrix verify that SC4626CSKTRT is sourced from the original manufacturer or authorized distributors?
All SC4626CSKTRT 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 SC4626CSKTRT meets industry standards.
7.What is the process for return or replacement of SC4626CSKTRT?
All SC4626CSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4626CSKTRT, 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 SC4626CSKTRT part is unused and in its original packaging.
Return procedure for SC4626CSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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