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Semtech Corporation SC431LCSK-1TRT
- Part No.:
- SC431LCSK-1TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431LCSK-1TRT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
SC431LCSK-1TRT 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 24–40A, 20mΩ dynamic resistance, and 175pF junction capacitance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC431LCSK-1TRT datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DFN-6 package layout guidance, clamping stability across temperature and current, and real-world use cases in USB Type-C and load switch protection circuits.
Technical Context
The SC431LCSK-1TRT 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 reverse breakdown (VBR), supports ≤600nA leakage at 22V, and delivers 1120W peak pulse power. Its solid-state architecture avoids junction heating limitations typical of PN-junction TVS devices, enabling stable performance in high-temperature industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 22V - Maximum continuous operating voltage before clamping activation; matches USB PD 20V nominal + margin. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave) - Ensures protected ICs (e.g., USB PD controllers) remain below damage thresholds. |
| Peak Pulse Current | 40A (8/20μs) - Meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD endpoints. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - Provides robust handling during assembly, testing, and end-user operation. |
| Dynamic Resistance | 20mΩ - Enables low-voltage clamping independent of surge magnitude; critical for maintaining tight voltage margins. |
| Junction Capacitance | 175pF at 22V, 1MHz - Low enough for VBus line protection without signal integrity impact on DC/low-frequency power paths. |
| Operating Temperature | −40°C to +125°C - Supports deployment in automotive-adjacent, industrial, and ruggedized IoT applications. |
Pinout & Package
SC431LCSK-1TRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound. All six terminals are surface-mount; thermal performance relies on PCB copper area and multiple vias-not an exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return for surge current; all three pins must be connected to maximize current sharing and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., USB VBus); parallel connection ensures uniform current distribution and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping across current range | 27.5–28V from 24A to 40A - Eliminates design margin uncertainty caused by rising VC in traditional TVS diodes. |
| Stable clamping over temperature | No increase in VC from −40°C to +125°C - Enables reliable protection in uncontrolled thermal environments (e.g., industrial enclosures). |
| Low dynamic resistance | 20mΩ - Reduces IR drop during surge, preserving voltage headroom for downstream FETs and controllers. |
| High-energy surge capability | 1120W peak pulse power - Handles multi-kV lightning-induced surges per IEC 61000-4-5 without degradation. |
| Compact DFN-6 footprint | 1.6mm × 1.6mm - Saves >50% board area vs. SO-8 or SOT-23 TVS alternatives while maintaining superior performance. |
Applications
| USB Type-C VBus Protection | Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting USB Type-C power delivery bus against ESD, lightning surges, and connector hot-plug transients in notebooks and docking stations. IC Role / Device Role / Timing Role: Primary high-energy shunt protector placed between VBus and GND, upstream of the USB PD controller and load switch. Use Value: Maintains clamping at ≤28V across temperature and current-preventing damage to 24V-tolerant PD controllers where conventional TVS would exceed safe limits at elevated temperatures. |
Use Scenario: Safeguarding input pins of industrial-grade load switches (e.g., HS2950P) against EOS events in remote meters and robotics. IC Role / Device Role / Timing Role: Transient voltage clamp limiting stress on internal MOSFET gate oxide and drain-source junction during surge events. Use Value: Keeps clamping voltage below the load switch's absolute maximum VDS rating, avoiding latch-up or permanent failure during field-deployed surge exposure. |
| Industrial Power Rail Protection | IoT Device DC Input Protection |
|
Use Scenario: Securing 22V-rated auxiliary power rails in programmable logic controllers (PLCs) and motor drives exposed to long cable runs. IC Role / Device Role / Timing Role: High-current transient diverter placed at board edge to intercept externally coupled surges before reaching sensitive regulators and microcontrollers. Use Value: Delivers 40A surge handling with minimal voltage overshoot-enabling compliance with IEC 61000-4-5 Level 4 without external series impedance or derating. |
Use Scenario: Hardening 22V DC input of battery-powered IoT gateways against ESD and induced transients in smart building deployments. IC Role / Device Role / Timing Role: Solid-state EOS suppressor replacing bulkier MOV+TVS stacks, minimizing BOM count and PCB space. Use Value: Combines ±30kV ESD immunity and 40A surge rating in a 1.6mm² footprint-reducing system-level test failures and field returns in compact, thermally constrained designs. |
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; differs only in reel quantity (3,000 pcs vs. 1,000 pcs for SC431LCSK-1TRT). | Same use cases: USB PD, load switch, industrial 22V rail protection. | Select TDS2211P.C for higher-volume procurement; SC431LCSK-1TRT suits prototyping and mid-volume production with smaller reels. |
| uClamp2411ZA | 24V VRWM, lower 24A IPP rating, 12pF capacitance, SOD-323 package - optimized for CC/SBU lines, not VBus. | Limited to low-capacitance, low-current signal-line protection; unsuitable for 40A power rail clamping. | Use uClamp2411ZA only for USB Type-C configuration channel (CC) or sideband use (SBU) lines-not as a replacement for SC431LCSK-1TRT on VBus. |
Compared with TDS2211P.C, SC431LCSK-1TRT offers identical protection performance with smaller reel packaging; versus uClamp2411ZA, it provides 67% higher surge current rating and 15× higher capacitance tolerance-making it suitable for power-line rather than signal-line protection.
Availability
SC431LCSK-1TRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and 22V IoT power input circuits requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC431LCSK-1TRT 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 SC431LCSK-1TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection applications where stable clamping and temperature resilience are critical.
FAQ
What is the maximum continuous operating voltage for SC431LCSK-1TRT?
The SC431LCSK-1TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC or RMS without entering clamping mode. This aligns with USB PD specifications where VBus may reach 20V nominal with transient margin, ensuring reliable operation without false triggering during normal use.
How does SC431LCSK-1TRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes whose clamping voltage rises linearly with peak pulse current (VC = VBR + IPP × RDYN), the SC431LCSK-1TRT maintains a near-constant clamping voltage of 27.5–28V from 24A to 40A due to its FET-based architecture and decreasing RDS(on). This eliminates design uncertainty caused by current-dependent voltage overshoot.
Can SC431LCSK-1TRT be used to protect USB Type-C CC lines?
No-SC431LCSK-1TRT is not suitable for USB Type-C CC (Configuration Channel) line protection. Its 175pF capacitance and 22V VRWM are optimized for VBus power lines. For CC lines, Semtech recommends uClamp2411ZA (12pF, 24V), which minimizes signal distortion on the low-speed, bidirectional CC bus.
What is the recommended PCB layout for SC431LCSK-1TRT to achieve full 40A surge rating?
To achieve the full 40A rating, all three IN pins (4, 5, 6) must be shorted together with a single low-inductance trace to the protected line, and all three GND pins (1, 2, 3) must connect to a solid ground plane using ≥4 thermal vias. Placement within 5mm of the connector is required to minimize coupling into adjacent traces during fast ESD events.
Is SC431LCSK-1TRT compliant with RoHS and halogen-free standards?
Yes-SC431LCSK-1TRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its DFN-6 package uses UL 94V-0 rated molding compound and lead-free terminal finish, meeting environmental requirements for industrial and consumer electronics manufacturing.
SC431LCSK-1TRT 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:
- ±1%
- 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-1TRT FAQ
1.How can I place an order for SC431LCSK-1TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LCSK-1TRT 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-1TRT reliable?
The price and inventory of SC431LCSK-1TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LCSK-1TRT is usually 5 days.
3.What payment methods are accepted for SC431LCSK-1TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LCSK-1TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LCSK-1TRT?
SC431LCSK-1TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LCSK-1TRT 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-1TRT?
For technical support, including SC431LCSK-1TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LCSK-1TRT requirements.
6.How does Aetrix verify that SC431LCSK-1TRT is sourced from the original manufacturer or authorized distributors?
All SC431LCSK-1TRT 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-1TRT meets industry standards.
7.What is the process for return or replacement of SC431LCSK-1TRT?
All SC431LCSK-1TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LCSK-1TRT, 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-1TRT part is unused and in its original packaging.
Return procedure for SC431LCSK-1TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431LCSK-1TRT Tags
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