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Semtech Corporation SC4626ZSKTRT
- Part No.:
- SC4626ZSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC4626ZSKTRT.pdf
- Description:
- IC REG BUCK 3.3V 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
SC4626ZSKTRT from Semtech is a Transient Diverting Suppressor (TDS) designed for high-energy EOS protection of 22V-rated I/O or power lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, and 175pF junction capacitance at 22V - deployed in USB Type-C PD input protection and industrial load switch front-end circuits.
For engineers reviewing the SC4626ZSKTRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, real-world clamping stability across temperature and current, and validated alternatives for 22V bus protection design.
Technical Context
The SC4626ZSKTRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to ultra-low dynamic resistance (20mΩ) and decreasing RDS(on) under surge conditions.
It operates across –40°C to +125°C with stable 27.5–28V clamping at both 24A and 40A (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), and maintains <600nA reverse leakage at 22V - enabling reliable protection in thermally demanding industrial and portable applications without derating.
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) - ensures downstream 24V-rated ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 (±1kV, RS = 42Ω) for industrial equipment and USB PD input stages. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity requirements without external shielding. |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact on adjacent traces. |
| Dynamic Resistance | 20mΩ (1A–40A, 8/20μs) - enables flat clamping curve and minimizes voltage overshoot during fast-rising transients. |
Pinout & Package
SC4626ZSKTRT is housed in a Pb-free, RoHS-compliant DFN-6 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 datasheet layout guidelines to achieve rated 40A surge capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to solid ground plane via multiple vias to minimize inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS in USB-C); all three pins are internally tied and must be routed together to connector for uniform current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 1–40A surge range and –40°C to +125°C - eliminates need for derating or safety margin inflation in thermal-aware designs. |
| FET-based shunt architecture | Replaces traditional TVS diode with active FET switch triggered by precision breakdown circuit - reduces clamping dependency on junction temperature and current magnitude. |
| Low dynamic resistance | 20mΩ measured between 1A and 40A - ensures minimal IR drop during surge, preserving clamping accuracy and reducing localized heating. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz & 5kHz bursts) - protects against repetitive switching noise in motor drives and industrial PLCs. |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Front-End Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles supporting up to 100W PD negotiation. IC Role / Device Role / Timing Role: Primary EOS suppressor placed immediately after connector, before PD controller and load switch. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - prevents PD controller latch-up or gate oxide damage where standard TVS would exceed 35V. |
Use Scenario: Shielding HS2950P or similar load switches from lightning-induced surges in remote meters and robotics. IC Role / Device Role / Timing Role: First-line transient diverter on VIN input, limiting voltage seen by internal FET drain-source junction. Use Value: Clamps below 28V at full 40A, keeping load switch VDS(max) margin intact - avoids destructive avalanche or thermal runaway during 8/20μs surges. |
| IoT Device Power Rail Protection | Storage Device 22V Backup Supply Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed smart sensors exposed to ESD during field servicing. IC Role / Device Role / Timing Role: Standalone EOS protector on always-on supply line feeding MCU and RF transceiver. Use Value: Delivers ±30kV ESD robustness with only 175pF capacitance - no signal coupling or power rail instability on low-noise analog sections. |
Use Scenario: Safeguarding 22V supercapacitor backup supplies in SSDs and NVMe modules during hot-plug or system fault events. IC Role / Device Role / Timing Role: Bidirectional transient clamp on backup rail input, referenced to system ground. Use Value: Stable 27.5–28V clamping across –40°C to +85°C ensures consistent protection during cold storage or server rack thermal cycling. |
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-and-reel packaging (3,000/reel). | No functional difference - TDS2211P.C is the official Semtech orderable part number; SC4626ZSKTRT is a valid branded variant used in distribution channels. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors requiring exact manufacturer PN traceability. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, higher 30V clamping at 20A, 12pF capacitance - optimized for CC/SBU lines, not power rails. | Designed for low-capacitance data-line protection (CC/SBU), not 22V power bus duty - insufficient surge rating and clamping for VBUS use. | Use uClamp2411ZA only for auxiliary signal lines; not a functional substitute for SC4626ZSKTRT in power rail roles. |
Compared with TDS2211P.C (identical device) and uClamp2411ZA (lower-energy signal-line suppressor), SC4626ZSKTRT delivers purpose-built 40A/22V power rail protection with flat clamping - making it irreplaceable for USB PD and industrial load switch inputs where voltage margin and thermal stability are critical.
Availability
SC4626ZSKTRT is available at Aetrix Electronics and suitable for USB Type-C PD systems, industrial load switch front-ends, and IoT 22V power rail protection requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SC4626ZSKTRT 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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity applications.
The SC4626ZSKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line - engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where stable clamping, temperature independence, and high surge current handling are mandatory.
FAQ
What is the exact package type and dimensions of SC4626ZSKTRT?
SC4626ZSKTRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed pad (no thermal pad required). Pin 1 is marked with a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern follows Semtech's recommended layout with multiple vias to ground for optimal surge performance.
Does SC4626ZSKTRT meet IEC 61000-4-5 Level 4 surge immunity?
Yes, SC4626ZSKTRT is rated for 40A (8/20μs) and ±1kV (1.2/50μs, RS = 42Ω), satisfying IEC 61000-4-5 Level 4 for industrial equipment. Its 27.5–28V clamping ensures protected ICs remain within safe operating voltage limits even under worst-case surge conditions.
How does SC4626ZSKTRT differ from standard TVS diodes in clamping behavior?
Unlike TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC4626ZSKTRT uses an active FET shunt that maintains ~27.5–28V clamping from 1A to 40A and across –40°C to +125°C - eliminating thermal derating and improving system-level reliability.
Can SC4626ZSKTRT be used on USB-C superspeed (SS) differential pairs?
No, SC4626ZSKTRT is not suitable for USB-C SS lanes (TX/RX) due to its 175pF capacitance, which would severely degrade signal integrity. For SS lines, Semtech recommends RClamp3371ZC (<0.25pF); SC4626ZSKTRT is intended exclusively for VBUS or other 22V power/data lines with lower bandwidth requirements.
What is the maximum operating temperature range for SC4626ZSKTRT?
SC4626ZSKTRT is specified for continuous operation from –40°C to +125°C. Its clamping voltage remains stable across this full range, and junction temperature is rated to +150°C - enabling deployment in under-hood automotive modules, industrial motor drives, and sealed IoT enclosures without thermal throttling.
SC4626ZSKTRT 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):
- 3.3V
- 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
SC4626ZSKTRT FAQ
1.How can I place an order for SC4626ZSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4626ZSKTRT 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 SC4626ZSKTRT reliable?
The price and inventory of SC4626ZSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4626ZSKTRT is usually 5 days.
3.What payment methods are accepted for SC4626ZSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4626ZSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4626ZSKTRT?
SC4626ZSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4626ZSKTRT 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 SC4626ZSKTRT?
For technical support, including SC4626ZSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4626ZSKTRT requirements.
6.How does Aetrix verify that SC4626ZSKTRT is sourced from the original manufacturer or authorized distributors?
All SC4626ZSKTRT 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 SC4626ZSKTRT meets industry standards.
7.What is the process for return or replacement of SC4626ZSKTRT?
All SC4626ZSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4626ZSKTRT, 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 SC4626ZSKTRT part is unused and in its original packaging.
Return procedure for SC4626ZSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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