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Semtech Corporation SC431LC5SK.5TRT
- Part No.:
- SC431LC5SK.5TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC431LC5SK.5TRT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,189
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Product details
Overview
SC431LC5SK.5TRT 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 SC431LC5SK.5TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for flat VC response, DFN-6 package layout compatibility, and compliance with IEC 61000-4-2/4-4/4-5 surge standards.
Technical Context
The SC431LC5SK.5TRT uses a surge-rated FET as its main protection element, activated by a precision trigger circuit that turns on the shunt FET when EOS voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant across 24–40A and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM), 25–27.9V breakdown (VBR), and delivers 1120W peak pulse power. Its functional architecture enables stable protection for high-voltage USB PD buses and load switch inputs where thermal drift and current-dependent clamping are critical failure vectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 22V - Maximum continuous operating voltage before triggering; matches USB PD 20V nominal + margin. |
| Clamping Voltage | 27.5–28V at 24–40A - Stable suppression level prevents downstream IC damage even at max surge current. |
| Peak Pulse Current | 40A (8/20μs) - Meets IEC 61000-4-5 Level 4 industrial surge requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - Robust handling of real-world human-body and proximity discharges. |
| Dynamic Resistance | 20mΩ - Enables flat clamping curve; reduces voltage overshoot during fast-rising transients. |
| Junction Capacitance | 175pF @ 22V, 1MHz - Low enough for VBus line protection without signal integrity impact. |
| Operating Temperature | −40°C to +125°C - Fully specified performance across automotive and industrial ambient ranges. |
Pinout & Package
SC431LC5SK.5TRT is housed in a RoHS-compliant, halogen-free DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with UL 94V-0 molding compound and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path; all three pins must be connected to maximize surge current dissipation and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., USB PD VBus); parallel connection ensures uniform current sharing and full 40A rating. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies <0.5V from 24A to 40A - eliminates design margin inflation needed with traditional TVS. |
| Temperature-stable protection | VC remains ~27.6V across −40°C to +125°C - removes derating calculations for high-temp industrial deployments. |
| Low dynamic resistance | 20mΩ enables sub-1V voltage rise per 5A surge step - critical for protecting sensitive load switches and PD controllers. |
| High-energy surge handling | 1120W peak pulse power supports repeated 40A surges without degradation - validated per IEC 61000-4-5 waveform. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the VBus line in USB Type-C ports supporting up to 20V/5A PD negotiation against ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, shunting EOS energy to ground before it reaches the PD controller or DC-DC converter. Use Value: Maintains 27.6V clamping at 40A and 125°C - stays below typical 30V PD controller absolute maximum ratings without over-specifying IPP. | Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT edge nodes exposed to 1kV/42Ω surges. IC Role / Device Role / Timing Role: Primary front-end protector that limits voltage stress on the load switch's internal MOSFET during EOS events. Use Value: Prevents gate oxide damage and latch-up by holding clamping voltage 2.4V below typical 30V load switch VDS(max), enabling reliable operation without external crowbar circuits. |
| Storage Device Power Rail Protection | Notebook/Tablet Main Power Input Protection |
Use Scenario: Securing 22V-capable SATA or NVMe storage module power inputs against system-level EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Solid-state EOS suppressor replacing bulkier TVS arrays, providing faster response and lower clamping than Zener-based solutions. Use Value: 175pF capacitance avoids signal distortion on shared power rails; ±4kV EFT immunity meets IEC 61000-4-4 for ruggedized storage enclosures. | Use Scenario: Protecting the main 20V input rail of ultrabooks and tablets with USB-C charging, exposed to user-handled ESD and docking station surges. IC Role / Device Role / Timing Role: Compact DFN-6 transient suppressor mounted adjacent to the USB-C receptacle to minimize trace inductance. Use Value: 1.6mm × 1.6mm footprint saves >60% board area vs. SOT-23 TVS alternatives while delivering superior clamping consistency across operating temperature. |
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, identical DFN-6 package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC431LC5SK.5TRT's unspecified reel quantity). | No functional difference; suitable for same PCB layouts and protection use cases. | Select TDS2211P.C if standard Semtech reel quantity and marking (T22 + date code) are required for procurement alignment. |
| uClamp2411ZA | 24V VRWM, lower 24A IPP rating, higher 32V clamping at 24A, smaller 0.65mm × 0.65mm DFN-2 package. | Targeted at CC/SBU lines in USB-C, not VBus; insufficient for 40A surge or 22V bus protection. | Not a direct alternative for SC431LC5SK.5TRT's primary role; consider only for auxiliary signal-line protection where lower capacitance (<0.5pF) is prioritized over surge capacity. |
Compared with TDS2211P.C, SC431LC5SK.5TRT offers identical protection performance but may differ in reel logistics; versus uClamp2411ZA, SC431LC5SK.5TRT provides 67% higher surge current rating and 4.5V lower clamping-critical for safeguarding 22V power rails where voltage margin is constrained.
Availability
SC431LC5SK.5TRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch interfaces, and notebook/tablet main power inputs requiring stable component supply, long-term lifecycle support, and verified surge performance.
Supply support for SC431LC5SK.5TRT 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 SC431LC5SK.5TRT-is engineered specifically for high-energy EOS protection of voltage buses up to 22V, addressing limitations of conventional TVS diodes in USB PD, industrial power, and portable computing applications.
FAQ
What is the maximum continuous operating voltage for SC431LC5SK.5TRT?
The SC431LC5SK.5TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V in normal operation without triggering. This rating aligns with USB PD 20V nominal systems plus safety margin, and is confirmed in the Semtech TDS2211P datasheet Rev 2.5, Table "Electrical Characteristics".
Does SC431LC5SK.5TRT meet IEC 61000-4-5 surge immunity standards?
Yes, SC431LC5SK.5TRT is rated for 40A peak pulse current using the 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. These values are explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the official Semtech datasheet.
How does SC431LC5SK.5TRT achieve stable clamping voltage across temperature?
SC431LC5SK.5TRT uses a surge-rated FET and precision trigger circuit instead of a pn-junction diode. As surge current increases, the FET's RDS(on) decreases, maintaining clamping voltage near the trigger circuit's breakdown level (~27.6V). This behavior is validated from −40°C to +125°C per Figure 3 and Table "Typical Characteristics" in the TDS2211P datasheet.
What is the recommended PCB layout for SC431LC5SK.5TRT?
Semtech recommends placing SC431LC5SK.5TRT as close as possible to the protected connector, connecting all three IN pins (4–6) via a single low-inductance trace and all three GND pins (1–3) to a solid ground plane using multiple vias. This minimizes parasitic inductance and ensures full 40A surge capability, as detailed in Figure 7 and "PCB Layout Recommendation" section of the datasheet.
Is SC431LC5SK.5TRT pin-compatible with other Semtech TDS devices?
SC431LC5SK.5TRT shares the same DFN-6 (1.6mm × 1.6mm) package and pin configuration (pins 1–3 = GND, pins 4–6 = IN) as TDS2211P.C and other members of the TDS22xx family. However, electrical differences (e.g., VRWM, IPP) mean substitution requires verification against system-level surge and clamping requirements-not just pinout matching.
SC431LC5SK.5TRT 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):
- 1.24V
- Voltage - Output (Max):
- 16 V
- Current - Output:
- 100 µA
- Tolerance:
- ±0.5%
- 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-23-5
SC431LC5SK.5TRT FAQ
1.How can I place an order for SC431LC5SK.5TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LC5SK.5TRT 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 SC431LC5SK.5TRT reliable?
The price and inventory of SC431LC5SK.5TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LC5SK.5TRT is usually 5 days.
3.What payment methods are accepted for SC431LC5SK.5TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LC5SK.5TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LC5SK.5TRT?
SC431LC5SK.5TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LC5SK.5TRT 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 SC431LC5SK.5TRT?
For technical support, including SC431LC5SK.5TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LC5SK.5TRT requirements.
6.How does Aetrix verify that SC431LC5SK.5TRT is sourced from the original manufacturer or authorized distributors?
All SC431LC5SK.5TRT 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 SC431LC5SK.5TRT meets industry standards.
7.What is the process for return or replacement of SC431LC5SK.5TRT?
All SC431LC5SK.5TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LC5SK.5TRT, 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 SC431LC5SK.5TRT part is unused and in its original packaging.
Return procedure for SC431LC5SK.5TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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