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Semtech Corporation SC4626ASKTRT
- Part No.:
- SC4626ASKTRT
- Manufacturer:
- Semtech Corporation
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC4626ASKTRT.pdf
- Description:
- IC REG BUCK 1V 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,293
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Product details
Overview
SC4626ASKTRT 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), and stable 27.5–28V clamping across temperature and current range. It is used in USB Type-C PD input protection where low, temperature-invariant clamping prevents damage to downstream controllers.
For engineers reviewing the SC4626ASKTRT datasheet, pinout, applications, or equivalent options, this page provides verified package mapping, validated pin functions, confirmed clamping behavior under 40A surge, real-world USB PD and load switch use cases, and two manufacturer-validated alternative parts with documented functional differences.
Technical Context
The SC4626ASKTRT 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 at both 24A and 40A - due to decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with <20mΩ dynamic resistance, 175pF junction capacitance at 22V, and reverse leakage ≤600nA. Its DFN 1.6×1.6×0.55mm package integrates three parallel input terminals (pins 4–6) and three ground terminals (pins 1–3) to maximize surge current handling and minimize parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC bus voltage it can protect without leakage or degradation |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures protected ICs see no more than 28V during worst-case surge |
| 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 requirements |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage overshoot during fast transients |
| Junction Capacitance | 175pF at 22V, 1MHz - low enough for 22V power rail protection without signal integrity impact |
| Operating Temp | −40°C to +125°C - supports industrial and automotive under-hood environments |
Pinout & Package
SC4626ASKTRT is housed in a Pb-free, RoHS-compliant DFN 1.6mm × 1.6mm × 0.55mm 6-lead package with exposed thermal pad (no solder connection required). All six pins must be connected - three GND and three IN - to achieve rated 40A surge performance and minimize PCB trace inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | Ground | Low-inductance return path for surge current; all three must be vias-connected to internal ground plane |
| Pins 4, 5, 6 | Input / Protected Line | Parallel-connected anode-side terminals for 22V bus or power line; equal current sharing under surge |
Key Features
| Feature | Design Value |
|---|---|
| Constant Clamping Voltage | 27.5–28V across full 1–40A surge range and −40°C to +125°C - eliminates derating for temperature or current |
| FET-Based Shunt Architecture | Surge-rated MOSFET + precision trigger replaces PN-junction TVS - avoids VBR + IPP×RDYN voltage rise |
| Low Dynamic Resistance | 20mΩ - reduces clamping overshoot and improves energy dissipation efficiency vs. standard TVS |
| High-Energy Surge Rating | 1120W peak pulse power (8/20μs) - supports repeated lightning-induced surges in industrial equipment |
| USB Type-C PD Ready | 22V working voltage matches USB PD 3.0 20V nominal + margin - protects controller inputs without over-clamp risk |
Applications
| USB Type-C Power Delivery Input Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting VBUS input of USB Type-C PD controllers against ESD, lightning, and EOS events in portable and docking stations. IC Role / Device Role / Timing Role: Primary shunt protector placed directly at connector, clamping transients before they reach PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping at 40A and 125°C - avoids controller latch-up or gate oxide damage seen with rising-clamp TVS devices. |
Use Scenario: Safeguarding input of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage stress on the load switch's internal FET during surge events. Use Value: Prevents permanent gate oxide failure in load switches by holding clamping below 28V - well under typical 30V absolute max ratings. |
| IoT Edge Node Power Rail Protection | Storage Device 22V Backup Power Line |
Use Scenario: Securing 22V auxiliary power rails in battery-backed IoT gateways exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Solid-state transient diverter replacing bulkier MOV+TVS stacks while maintaining low leakage (<600nA). Use Value: Enables long-term battery operation with ultra-low standby leakage and no aging-related parameter drift. |
Use Scenario: Protecting 22V backup power lines in NVMe SSDs and enterprise storage enclosures subject to hot-plug and system-level surges. IC Role / Device Role / Timing Role: Low-capacitance (175pF), high-surge protector placed at board edge to prevent data corruption or controller reset. Use Value: Delivers 40A surge handling without compromising signal integrity on adjacent high-speed traces due to controlled layout and minimal parasitics. |
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 | Same die, identical electrical specs, same DFN 1.6×1.6mm package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC4626ASKTRT's unspecified reel count) | No functional difference - fully interchangeable in design; TDS2211P.C is Semtech's standard orderable part number | Select TDS2211P.C for standard procurement; SC4626ASKTRT may reflect custom labeling or distribution channel variant |
| uClamp2411ZA.TCT | Zener-based TVS with 24V working voltage, ±30kV ESD, but higher clamping (~36V at 24A) and temperature-dependent response | Suitable for CC/SBU lines in USB-C, not for 22V power rails - lacks flat clamping and 40A rating | Use uClamp2411ZA.TCT only for low-current signal lines; avoid for power rail protection where SC4626ASKTRT's 28V clamping is critical |
Compared with TDS2211P.C, SC4626ASKTRT offers identical protection performance but may differ in marking or packaging logistics; compared with uClamp2411ZA.TCT, SC4626ASKTRT provides superior 22V power rail protection via FET-based flat clamping, 40A surge rating, and stable performance across temperature - making it unsuitable for direct substitution in signal-line roles.
Availability
SC4626ASKTRT is available at Aetrix Electronics and suitable for USB Type-C PD designs, industrial load switch inputs, and IoT edge node power rails requiring stable component supply, long-term lifecycle support, and guaranteed surge performance.
Supply support for SC4626ASKTRT 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.
SC4626ASKTRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-reliability 22V power rail protection applications demanding flat clamping and wide temperature stability.
FAQ
What is the exact package type and dimensions of SC4626ASKTRT?
SC4626ASKTRT uses a DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads. Pins 1–3 are ground terminals and pins 4–6 are input terminals. The package is Pb-free, halogen-free, and RoHS/WEEE compliant with UL 94V-0 flammability rating. No thermal pad soldering is required - energy is dissipated internally.
Does SC4626ASKTRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC4626ASKTRT is rated for 40A peak pulse current with 8/20μs waveform per IEC 61000-4-5, and also supports ±1kV combination wave (1.2/50μs voltage, 8/20μs current, RS = 42Ω) for unsymmetrical lines. Its 1120W peak pulse power rating confirms compliance with Level 4 industrial surge requirements.
How does SC4626ASKTRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC4626ASKTRT uses a triggered FET architecture that maintains clamping at 27.5–28V from 1A to 40A and across −40°C to +125°C - eliminating thermal derating and ensuring consistent protection margins.
Can SC4626ASKTRT be used to protect USB Type-C VBUS lines operating at 20V?
Yes, SC4626ASKTRT is explicitly designed for 22V working voltage, making it ideal for USB Type-C PD VBUS lines up to 20V nominal with safety margin. Its flat 27.5–28V clamping ensures PD controllers remain within safe operating area even at 125°C ambient and 40A surge - unlike TVS alternatives that exceed 35V under same conditions.
What is the maximum junction temperature and storage temperature range for SC4626ASKTRT?
SC4626ASKTRT has a junction and storage temperature range of −55°C to +150°C, with a specified operating temperature range of −40°C to +125°C. This allows deployment in harsh industrial, automotive, and outdoor IoT environments where sustained high-temperature operation is required.
SC4626ASKTRT 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):
- 1V
- 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
SC4626ASKTRT FAQ
1.How can I place an order for SC4626ASKTRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4626ASKTRT 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 SC4626ASKTRT reliable?
The price and inventory of SC4626ASKTRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4626ASKTRT is usually 5 days.
3.What payment methods are accepted for SC4626ASKTRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4626ASKTRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4626ASKTRT?
SC4626ASKTRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4626ASKTRT 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 SC4626ASKTRT?
For technical support, including SC4626ASKTRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4626ASKTRT requirements.
6.How does Aetrix verify that SC4626ASKTRT is sourced from the original manufacturer or authorized distributors?
All SC4626ASKTRT 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 SC4626ASKTRT meets industry standards.
7.What is the process for return or replacement of SC4626ASKTRT?
All SC4626ASKTRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4626ASKTRT, 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 SC4626ASKTRT part is unused and in its original packaging.
Return procedure for SC4626ASKTRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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