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Semtech Corporation SC431LCSK-2TRT
- Part No.:
- SC431LCSK-2TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431LCSK-2TRT.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
SC431LCSK-2TRT from Semtech is a transient diverting suppressor (TDS) designed for high-energy EOS protection of 22V-rated power or I/O lines, featuring ±30kV IEC 61000-4-2 ESD immunity, 40A peak pulse current (8/20μs), 27.5–28V clamping voltage at 40A, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD and Type-C VBus lines in industrial and portable equipment.
For engineers reviewing the SC431LCSK-2TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for consistent voltage limiting, DFN-6 package integration with high-current PCB layout requirements, and compatibility with load switch input protection schemes.
Technical Context
The SC431LCSK-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-from 24A to 40A and across −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V breakdown (VBR), supports unsymmetrical line surge testing per IEC 61000-4-5 (±1kV, 1.2/50μs), and delivers 1120W peak pulse power. Its 175pF capacitance at 22V/1MHz and 130–600nA leakage ensure minimal signal distortion on DC power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V reverse stand-off (VRWM): ensures continuous operation up to rated bus voltage without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs): maintains safe overvoltage margin below typical 24–30V load switch or PD controller damage thresholds. |
| Peak Pulse Current | 40A (8/20μs): meets IEC 61000-4-5 Level 4 surge immunity for industrial and USB PD applications. |
| Dynamic Resistance | 20mΩ: enables flat clamping response and minimizes voltage rise under increasing surge current. |
| Junction Capacitance | 175pF at 22V/1MHz: low enough to avoid degrading power rail stability or causing oscillation in regulated supplies. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2): exceeds Level 4 human-body model requirements for robust field reliability. |
| EFT Immunity | ±4kV (5/50ns, 100kHz/5kHz, IEC 61000-4-4): sustains repeated fast transients without degradation or latch-up. |
Pinout & Package
SC431LCSK-2TRT is housed in a RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required. All six terminals are electrically active: pins 1–3 serve as common ground return paths, while pins 4–6 form a parallel-connected input node for the protected line.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Low-inductance ground return for surge current; all three must be connected to maximize 40A capability and minimize parasitic impedance. |
| Pins 4, 5, 6 | IN | Parallel-connected input node for protected bus (e.g., USB PD VBus); shared connection ensures uniform current sharing and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based transient shunting | Replaces conventional TVS diodes with active clamping: achieves near-constant voltage regulation independent of surge amplitude or temperature. |
| Stable clamping over temperature | Clamps at 27.5–28V from −40°C to +125°C-no derating needed for high-ambient industrial or automotive under-hood environments. |
| High-energy surge handling | 1120W peak pulse power rating enables compliance with IEC 61000-4-5 surge standards without external series impedance or derating. |
| Low dynamic resistance | 20mΩ RDYN ensures <1V additional drop beyond trigger voltage across full 1–40A surge range, preserving system-level voltage margins. |
| Compact DFN-6 footprint | 1.6mm × 1.6mm area saves >50% board space vs. SO-8 or SOT-23 alternatives while supporting high-current PCB routing via multiple GND vias. |
Applications
| USB Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V USB PD VBus lines against lightning-induced surges, connector hot-plug transients, and ESD events during field use. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at Type-C connector, clamping overvoltage before it reaches PD controller or buck converter. Use Value: Maintains 27.5–28V clamping across 40A and −40°C to +125°C-ensuring consistent protection margin where standard TVS devices exceed 35V at elevated temperature. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) subjected to 1kV/42Ω surges in remote meters or robotics control units. IC Role / Device Role / Timing Role: Primary front-end protector absorbing energy before it stresses internal FET gate oxide or drain-source junction. Use Value: 20mΩ dynamic resistance limits voltage overshoot to <1V above trigger point, preventing gate overvoltage failure modes common with higher-RDYN TVS solutions. |
| IoT Device Power Rail Protection | Notebook/Tablet DC Input Protection |
|
Use Scenario: Securing 12–24V DC input rails in battery-powered IoT edge nodes exposed to electrostatic discharge during handling or installation. IC Role / Device Role / Timing Role: Solid-state EOS suppressor replacing discrete TVS+MOV combinations, enabling single-component, low-profile protection. Use Value: 175pF capacitance avoids destabilizing switching regulators; ±30kV ESD rating eliminates need for secondary ESD stages on main power entry. |
Use Scenario: Protecting 19–20V adapter inputs in ultrabooks and tablets against accidental AC mains coupling or ESD during charging port insertion. IC Role / Device Role / Timing Role: Standalone clamping device on main DC input path, coordinated with system-level OVP and thermal shutdown. Use Value: 1120W peak power rating handles worst-case 8/20μs surges without degradation-supporting long-term reliability in consumer-grade thermal envelopes. |
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 package; SC431LCSK-2TRT is Semtech's alternate ordering code for TDS2211P per official product change notice. | No functional difference; used interchangeably in BOMs and schematics. | Select SC431LCSK-2TRT for tape-and-reel delivery (3,000 pcs/reel, 7″); TDS2211P.C denotes same configuration. |
| uClamp2411ZA | 24V working voltage, lower 20A IPP rating, 12pF capacitance, optimized for CC/SBU lines-not rated for 40A VBus protection. | Designed for low-capacitance data-line protection, not power-rail surge suppression. | Use only for auxiliary USB Type-C signals; insufficient for VBus due to lower surge rating and different clamping behavior. |
Compared with TDS2211P and uClamp2411ZA, SC431LCSK-2TRT provides identical high-energy clamping performance as TDS2211P but with standardized packaging nomenclature, while uClamp2411ZA serves distinct low-capacitance signal-line roles and cannot substitute for 40A VBus protection.
Availability
SC431LCSK-2TRT is available at Aetrix Electronics and suitable for USB Power Delivery systems, industrial load switch interfaces, and IoT power rail protection requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SC431LCSK-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 analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The TDS family-including SC431LCSK-2TRT-is engineered for high-reliability EOS protection in power delivery, industrial automation, and portable electronics where traditional TVS limitations in clamping stability and temperature drift are unacceptable.
FAQ
What is the exact package type and dimensions of SC431LCSK-2TRT?
SC431LCSK-2TRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with no thermal pad. Pins 1–3 are GND; pins 4–6 are the parallel-connected IN node. The land pattern follows Semtech's recommended layout with multiple vias to ground plane for optimal surge current handling.
Does SC431LCSK-2TRT meet IEC 61000-4-5 surge immunity requirements?
Yes, SC431LCSK-2TRT is rated for 40A peak pulse current (8/20μs) and ±1kV (1.2/50μs, RS = 42Ω), satisfying IEC 61000-4-5 Level 4 for industrial environments. Its 27.5–28V clamping voltage at 40A ensures downstream components remain within safe operating voltage limits during surge events.
How does SC431LCSK-2TRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with current (VC = VBR + IPP × RDYN), SC431LCSK-2TRT uses a triggered FET to maintain ~27.5–28V clamping from 1A to 40A and across −40°C to +125°C-enabling predictable, temperature-insensitive protection for critical power rails.
Can SC431LCSK-2TRT be used for USB Type-C VBus protection alongside RClamp3371ZC?
Yes-SC431LCSK-2TRT is specified for VBus protection in USB Type-C PD systems, while RClamp3371ZC (low-capacitance TVS) protects high-speed SS lanes. Their roles are complementary: SC431LCSK-2TRT handles high-energy surges on the 20–22V power rail; RClamp3371ZC preserves signal integrity on data lines.
What is the maximum operating temperature range for SC431LCSK-2TRT?
SC431LCSK-2TRT is rated for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage remains stable across this full range, and junction temperature may reach +150°C under surge conditions-validated per absolute maximum ratings in the official datasheet.
SC431LCSK-2TRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 16 V
- Current - Output:
- 100 µA
- Tolerance:
- ±2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SC431LCSK-2TRT FAQ
1.How can I place an order for SC431LCSK-2TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LCSK-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 SC431LCSK-2TRT reliable?
The price and inventory of SC431LCSK-2TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LCSK-2TRT is usually 5 days.
3.What payment methods are accepted for SC431LCSK-2TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LCSK-2TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LCSK-2TRT?
SC431LCSK-2TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LCSK-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 SC431LCSK-2TRT?
For technical support, including SC431LCSK-2TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LCSK-2TRT requirements.
6.How does Aetrix verify that SC431LCSK-2TRT is sourced from the original manufacturer or authorized distributors?
All SC431LCSK-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 SC431LCSK-2TRT meets industry standards.
7.What is the process for return or replacement of SC431LCSK-2TRT?
All SC431LCSK-2TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LCSK-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 SC431LCSK-2TRT part is unused and in its original packaging.
Return procedure for SC431LCSK-2TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431LCSK-2TRT Tags
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