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Semtech Corporation SC4431CSK-2TRT
- Part No.:
- SC4431CSK-2TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC4431CSK-2TRT.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
SC4431CSK-2TRT 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 a stable 27.5–28V clamping voltage across temperature and current range. It is deployed in USB Type-C PD bus protection to safeguard controllers from overvoltage transients.
For engineers reviewing the SC4431CSK-2TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under 40A surge, DFN-6 thermal and layout performance, 22V working voltage compliance, and low 175pF junction capacitance for minimal signal distortion in high-speed interfaces.
Technical Context
The SC4431CSK-2TRT 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 the FET's decreasing RDS(on) under surge conditions.
It operates from −40°C to +125°C with <20mΩ dynamic resistance and maintains stable 22V reverse stand-off voltage and 25–27.9V breakdown voltage. Its 175pF capacitance at 22V/1MHz and 130–600nA leakage support integration into USB PD and industrial load-switch inputs without compromising signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without triggering |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold 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 smartphone/tablet ESD robustness requirements |
| Junction Capacitance | 175pF at 22V/1MHz - low enough to avoid signal degradation on USB PD VBUS lines while maintaining surge capability |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage overshoot during fast-rising transients |
Pinout & Package
SC4431CSK-2TRT 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 layout guidelines to achieve rated 40A surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three pins must be vias-connected to inner ground plane to minimize inductance |
| 4, 5, 6 | IN | Protected input node (e.g., USB PD VBUS); all three pins are internally paralleled and must be shorted externally via single trace |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A surge - eliminates need for derating at high ambient temperatures |
| FET-based shunt protection | Replaces traditional TVS diodes with lower RDS(on) and superior thermal stability - reduces risk of thermal runaway during repeated surges |
| Low leakage & capacitance | 600nA max IR at 22V and 175pF CJ - preserves power rail stability and avoids false triggering in always-on systems |
| DFN-6 footprint | 1.6mm × 1.6mm area - saves >60% board space vs. SO-8 or SOT-23 TVS alternatives while supporting same 40A rating |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting 20–22V USB PD VBUS lines against lightning-induced surges and connector hot-plug ESD events. IC Role / Device Role / Timing Role: Primary shunt protector placed adjacent to Type-C receptacle to clamp transients before reaching PD controller and load switch. Use Value: Maintains 27.5–28V clamping across −40°C to +125°C - prevents controller latch-up even in uncooled industrial enclosures. |
Use Scenario: Safeguarding input of high-side load switches (e.g., HS2950P) in remote meters and robotics against 1kV/42Ω line surges. IC Role / Device Role / Timing Role: Front-end transient suppressor that limits voltage stress on the load switch's internal MOSFET gate oxide. Use Value: 40A surge rating and 20mΩ dynamic resistance prevent destructive VDS overshoot during 8/20μs transients. |
| IoT Edge Node Power Rail Protection | Notebook/Tablet VBUS Line Protection |
Use Scenario: Securing 22V auxiliary rails in battery-powered IoT gateways exposed to ESD during field maintenance or docking. IC Role / Device Role / Timing Role: Standalone EOS suppressor on main power input, coordinated with low-capacitance TVS on data lines. Use Value: ±30kV ESD rating and 175pF capacitance enable compact, single-device protection without signal coupling penalties. |
Use Scenario: Protecting USB-C port VBUS in thin-client notebooks where board space and thermal constraints limit TVS options. IC Role / Device Role / Timing Role: Space-optimized alternative to stacked TVS arrays, mounted directly at connector footprint. Use Value: DFN-6 package allows placement within 2mm of connector - reduces PCB trace inductance and improves ESD response time. |
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 code T22 - direct Semtech factory variant with same tape-and-reel packaging (3,000/reel). | No functional difference; used interchangeably in production BOMs where part number formatting differs by distributor or internal ERP system. | Select TDS2211P.C when sourcing from Semtech-authorized channels requiring exact orderable SKU alignment. |
| uClamp2411ZA | 24V working voltage, lower 24A IPP rating, higher 30V clamping, and smaller 0.65mm × 0.65mm DFN-2 package - optimized for CC/SBU lines, not VBUS. | Designed for low-voltage, low-capacitance (<0.5pF) protection of USB-C configuration channel - unsuitable for 22V VBUS due to lower surge rating and higher clamping. | Choose uClamp2411ZA only for CC/SBU line protection; SC4431CSK-2TRT remains mandatory for VBUS-level surge handling. |
Compared with TDS2211P.C, SC4431CSK-2TRT offers identical protection performance but may reflect regional distribution labeling; versus uClamp2411ZA, SC4431CSK-2TRT provides 67% higher peak current capacity and 2.5× lower clamping voltage at rated surge-making it the sole viable option for 22V power rail protection.
Availability
SC4431CSK-2TRT 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, full traceability, and long-term lifecycle support.
Supply support for SC4431CSK-2TRT 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.
The SC4431CSK-2TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail applications demanding flat clamping and temperature-stable surge response.
FAQ
What is the maximum continuous operating voltage for SC4431CSK-2TRT?
The SC4431CSK-2TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC without entering conduction. This makes it suitable for USB PD systems with nominal 20V operation and 22V tolerance margins. Exceeding 22V risks premature triggering or degradation.
Does SC4431CSK-2TRT require a thermal pad on the PCB?
No, SC4431CSK-2TRT does not require an external thermal pad. Its DFN-6 package dissipates surge energy directly through the silicon die, and the datasheet explicitly states "no thermal pad is needed." Instead, robust grounding via all three GND pins (1, 2, 3) using multiple vias is critical to handle 40A peak current.
How does SC4431CSK-2TRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes-whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN)-the SC4431CSK-2TRT uses a triggered FET to maintain near-constant clamping: 27.5–28V from 24A to 40A. This eliminates thermal derating and ensures consistent protection across temperature and surge magnitude.
Can SC4431CSK-2TRT be used on USB SuperSpeed differential pairs?
No, SC4431CSK-2TRT is not suitable for USB SuperSpeed (TX/RX) lines. Its 175pF junction capacitance would severely distort high-frequency signals. For those lines, Semtech recommends ultra-low-capacitance devices like RClamp3371ZC (<0.25pF). SC4431CSK-2TRT is intended exclusively for VBUS or other single-ended 22V power/data lines.
What is the recommended PCB layout for optimal SC4431CSK-2TRT performance?
Place SC4431CSK-2TRT within 2mm of the protected connector. Connect all IN pins (4,5,6) with a single short trace, and tie all GND pins (1,2,3) to a solid ground plane using ≥3 vias each. Avoid stubs or splits in the IN/GND paths to minimize parasitic inductance-critical for sub-nanosecond ESD response.
SC4431CSK-2TRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.224V
- Voltage - Output (Max):
- 13.776 V
- Current - Output:
- 40 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.5V ~ 15V
- Current - Supply:
- -
- Current - Cathode:
- 110 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SC4431CSK-2TRT FAQ
1.How can I place an order for SC4431CSK-2TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC4431CSK-2TRT 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 SC4431CSK-2TRT reliable?
The price and inventory of SC4431CSK-2TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4431CSK-2TRT is usually 5 days.
3.What payment methods are accepted for SC4431CSK-2TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4431CSK-2TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC4431CSK-2TRT?
SC4431CSK-2TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC4431CSK-2TRT 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 SC4431CSK-2TRT?
For technical support, including SC4431CSK-2TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4431CSK-2TRT requirements.
6.How does Aetrix verify that SC4431CSK-2TRT is sourced from the original manufacturer or authorized distributors?
All SC4431CSK-2TRT 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 SC4431CSK-2TRT meets industry standards.
7.What is the process for return or replacement of SC4431CSK-2TRT?
All SC4431CSK-2TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC4431CSK-2TRT, 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 SC4431CSK-2TRT part is unused and in its original packaging.
Return procedure for SC4431CSK-2TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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