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Semtech Corporation SC4626LSKTRT
- Part No.:
- SC4626LSKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC4626LSKTRT.pdf
- Description:
- IC REG BUCK 1.8V 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,302
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Product details
Overview
SC4626LSKTRT 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 in a DFN 1.6×1.6×0.55mm 6-lead package - deployed in USB Type-C PD input protection.
For engineers reviewing the SC4626LSKTRT datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal-stable clamping behavior, DFN layout guidance, and direct alternatives for industrial-grade surge protection design.
Technical Context
The SC4626LSKTRT 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 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 (1.2/50μs + 8/20μs combination waveform, RS = 2Ω), and maintains <600nA reverse leakage at 22V. Its 175pF junction capacitance at 22V/1MHz supports high-speed bus protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - matches USB PD bus nominal voltage and withstand rating. |
| Clamping Voltage | 27.5–28V at 40A - stays below 29V damage threshold of common 30V-rated load switches and PD controllers. |
| 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 USB IF and industrial ESD test mandates. |
| Dynamic Resistance | 20mΩ - enables low-voltage overshoot during fast transients, minimizing stress on downstream ICs. |
| Junction Capacitance | 175pF at 22V/1MHz - compatible with DC-coupled 22V power rails; no high-frequency signal path impact. |
Pinout & Package
SC4626LSKTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with UL 94V-0 molding compound. All pins require connection for full 40A surge capability: pins 1–3 are ground terminals; pins 4–6 are protected line inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Low-inductance ground return path; all three must be connected to PCB ground plane via multiple vias for 40A surge conduction. |
| 4, 5, 6 | IN | Protected line input; tied together externally to VBUS or power rail; shared surge current path into shunt FET. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across 24–40A IPP range - eliminates derating needed with TVS diodes at elevated temperatures. |
| FET-based shunt topology | Surge energy dissipated in low-RDS(on) channel instead of PN junction - enables higher single-pulse survivability and thermal stability. |
| Temperature-stable performance | Clamping remains 27.5–28V from –40°C to +125°C - ensures consistent protection in automotive under-hood or industrial ambient conditions. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during sub-microsecond EFT bursts per IEC 61000-4-4. |
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 suppressor placed directly at connector entry point, shunting transients before reaching PD controller or load switch. Use Value: Maintains 27.5–28V clamping across temperature and current - avoids overvoltage damage to 30V-rated PD controllers even at 125°C ambient. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes exposed to 1kV/42Ω surges. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage seen by internal FET gate oxide and drain-source junction. Use Value: Prevents latch-up or permanent failure of load switch during 40A surge events - extends system uptime in ungrounded or field-deployed equipment. |
| Notebook/Tablet DC Power Input Protection | IoT Gateway 24V Rail Protection |
Use Scenario: Securing main DC input (e.g., 20V adapter rail) in portable computing devices against accidental AC mains coupling or ESD from user interface. IC Role / Device Role / Timing Role: Standalone transient suppressor replacing multi-stage TVS+MOV solutions - simplifies BOM and layout. Use Value: 1.6×1.6mm footprint saves >60% board area vs. discrete TVS+capacitor combos - critical for thin-profile designs. |
Use Scenario: Hardening 22–24V auxiliary power rails in cellular/Wi-Fi IoT gateways subjected to induced surges in factory or outdoor deployments. IC Role / Device Role / Timing Role: Single-component solution for IEC 61000-4-5 Level 3/4 compliance on non-isolated DC inputs. Use Value: Delivers 1120W peak pulse power handling (8/20μs) - sustains repeated surge events without parameter drift or degradation. |
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 1.6×1.6mm package, identical marking code T22 - confirmed drop-in replacement per Semtech ordering documentation. | No functional difference; used interchangeably in USB-C PD reference designs. | Select TDS2211P.C when sourcing from authorized Semtech distribution channels with full traceability. |
| uClamp2411ZA | 24V working voltage, ±30kV ESD, but lower 24A IPP rating and higher 33V clamping at 24A - lacks constant-clamp FET architecture. | Targeted at CC/SBU lines in USB-C, not main VBUS; unsuitable for 40A surge duty. | Use uClamp2411ZA only for auxiliary signal-line protection where lower IPP suffices and clamping margin allows. |
Compared with TDS2211P.C, SC4626LSKTRT offers identical performance and form factor, enabling seamless substitution; versus uClamp2411ZA, SC4626LSKTRT provides 67% higher surge current capacity and 5.5V lower clamping - making it the sole qualified option for 22V power rail hardening.
Availability
SC4626LSKTRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and notebook/tablet DC power rails requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for SC4626LSKTRT 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.
SC4626LSKTRT 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 applications demanding temperature-stable clamping and high surge endurance.
FAQ
What is the maximum operating temperature for SC4626LSKTRT?
The SC4626LSKTRT is rated for continuous operation from –40°C to +125°C ambient temperature. Its clamping voltage remains tightly controlled between 27.5V and 28V across this full range at 40A peak pulse current, ensuring reliable protection in harsh thermal environments such as industrial control cabinets or automotive under-dash locations where the SC4626LSKTRT is commonly deployed.
Does SC4626LSKTRT require external components for basic operation?
No, SC4626LSKTRT operates as a standalone transient suppressor with no external bias, timing, or filtering components required. Its integrated trigger circuit and shunt FET activate autonomously during overvoltage events. Layout best practices - including short, wide traces to connector and multiple vias from GND pins 1–3 to inner ground planes - are sufficient; no series resistors, capacitors, or TVS co-components are needed for SC4626LSKTRT to meet IEC 61000-4-2/4-5 compliance.
How does SC4626LSKTRT differ from standard TVS diodes in surge response?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), the SC4626LSKTRT uses a triggered FET to maintain near-constant clamping - 27.5–28V from 24A to 40A. This eliminates the need to overspecify IPP to meet voltage thresholds and prevents thermal runaway at high ambient temperatures, a known limitation of PN-junction TVS devices that the SC4626LSKTRT was explicitly designed to overcome.
Can SC4626LSKTRT protect high-speed data lines like USB SuperSpeed?
No, SC4626LSKTRT is not intended for high-speed data line protection. With 175pF junction capacitance, it is optimized for DC or low-frequency power rails (e.g., VBUS, load switch inputs). For USB 3.x SuperSpeed lanes (TX/RX), Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF); the SC4626LSKTRT should be used exclusively on the 22V power path, while separate, specialized suppressors handle signal integrity-critical data lines.
Is SC4626LSKTRT compliant with RoHS and halogen-free standards?
Yes, SC4626LSKTRT is fully RoHS/WEEE compliant and halogen-free, with Pb-free lead finish and UL 94V-0 flammability-rated molding compound. Its DFN 1.6×1.6×0.55mm package meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) requirements and supports standard reflow profiles - confirming suitability for high-volume automated assembly where the SC4626LSKTRT is routinely integrated into consumer and industrial PCBs.
SC4626LSKTRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.8V
- 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
SC4626LSKTRT FAQ
1.How can I place an order for SC4626LSKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4626LSKTRT 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 SC4626LSKTRT reliable?
The price and inventory of SC4626LSKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4626LSKTRT is usually 5 days.
3.What payment methods are accepted for SC4626LSKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4626LSKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4626LSKTRT?
SC4626LSKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4626LSKTRT 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 SC4626LSKTRT?
For technical support, including SC4626LSKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4626LSKTRT requirements.
6.How does Aetrix verify that SC4626LSKTRT is sourced from the original manufacturer or authorized distributors?
All SC4626LSKTRT 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 SC4626LSKTRT meets industry standards.
7.What is the process for return or replacement of SC4626LSKTRT?
All SC4626LSKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4626LSKTRT, 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 SC4626LSKTRT part is unused and in its original packaging.
Return procedure for SC4626LSKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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