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Semtech Corporation SC431LI5SK.5TRT
- Part No.:
- SC431LI5SK.5TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC431LI5SK.5TRT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
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Product details
Overview
SC431LI5SK.5TRT 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 protects USB Type-C power delivery buses, load switch inputs, and industrial interfaces where low, flat clamping is critical.
For engineers reviewing the SC431LI5SK.5TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability over 40A surge current, DFN-6 package thermal and layout constraints, 22V working voltage compliance, and FET-based shunt architecture versus conventional TVS diodes.
Technical Context
The SC431LI5SK.5TRT uses a surge-rated MOSFET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike standard 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 across –40°C to +125°C with <20mΩ dynamic resistance and 175pF junction capacitance at 22V/1MHz. The device is rated for 1120W peak pulse power and maintains ≤600nA reverse leakage at VRWM = 22V, enabling reliable protection in thermally demanding industrial and USB PD environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 22V - defines maximum continuous DC bus voltage before activation; matches USB PD 20V nominal + margin. |
| Clamping Voltage (VC) | 27.5–28V at 40A (8/20μs) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold even at max surge. |
| Peak Pulse Current (IPP) | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD ports. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external staging. |
| Junction Capacitance (CJ) | 175pF at 22V/1MHz - low enough for 22V power rail protection; not suitable for high-speed data lines (requires separate low-C TVS). |
| Dynamic Resistance (RDYN) | 20mΩ - enables flat clamping by minimizing IR drop increase across surge current range. |
| Package | DFN 1.6 × 1.6 × 0.55 mm, 6-lead - ultra-compact footprint saves board space vs. SOT-23 or SOIC alternatives; requires symmetric ground vias for full 40A capability. |
Pinout & Package
SC431LI5SK.5TRT is housed in a RoHS-compliant, halogen-free DFN-6 package (1.6mm × 1.6mm × 0.55mm) with exposed thermal pad not required-energy is dissipated in the silicon FET. All six terminals must be connected: pins 1–3 are dedicated GND; pins 4–6 are parallel-connected IN terminals for optimal surge current sharing and minimal trace inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | Ground (GND) | Common return path for surge current; all three must be soldered and connected via multiple vias to internal ground plane for full 40A rating. |
| Pins 4, 5, 6 | Input (IN) | Parallel-connected surge input terminals; connect directly to protected line (e.g., VBUS in USB-C); shared routing minimizes inductance and ensures balanced current division. |
Key Features
| Feature | Design Value |
|---|---|
| FET-based shunt architecture | Enables near-constant clamping voltage (27.5–28V) across 1–40A surge range-unlike TVS diodes whose VC rises linearly with IPP. |
| Low dynamic resistance | 20mΩ ensures minimal voltage overshoot during fast-rising transients, critical for protecting sensitive 22V-rated load switches and PD controllers. |
| Wide temperature stability | Clamping voltage varies <0.5V from –40°C to +125°C-eliminates derating concerns in industrial enclosures or automotive under-hood applications. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - robust against repetitive burst noise in motor drives and PLC I/O modules. |
| Space-optimized DFN | 1.6 × 1.6 mm footprint reduces PCB area by >60% vs. comparable SOIC-8 TVS solutions while maintaining full 40A surge rating. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20V–22V VBUS lines in USB-C receptacles supporting up to 100W PD, exposed to ESD, lightning-induced surges, and hot-plug transients. IC Role / Device Role / Timing Role: Primary high-energy shunt suppressor placed immediately after the connector, clamping transients before they reach the PD controller and buck-boost ICs. Use Value: Maintains 27.5–28V clamping at 40A and 125°C-prevents latch-up or gate oxide damage in PD controllers that fail above 30V. |
Use Scenario: Safeguarding input pins of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems subject to 1kV/42Ω surges. IC Role / Device Role / Timing Role: Front-end transient diverter that limits voltage across the load switch's internal FET drain-source during EOS events. Use Value: Keeps clamping voltage below the FET's BVDSS rating (typically 30–40V), preventing avalanche failure and ensuring long-term reliability without derating. |
| IoT Edge Node Power Bus Protection | Storage Device 22V Rail Protection |
|
Use Scenario: Securing 22V auxiliary rails in battery-backed IoT gateways and edge AI nodes deployed in uncontrolled environments with poor grounding. IC Role / Device Role / Timing Role: Single-device solution for combined ESD, EFT, and surge protection on non-isolated DC input rails feeding PMICs and microcontrollers. Use Value: Eliminates need for multi-stage protection (TVS + MOV + filter), reducing BOM count and layout complexity while meeting IEC 61000-4-x immunity standards. |
Use Scenario: Protecting 22V power inputs to NVMe SSD modules and enterprise HDD backplanes subjected to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp placed at board edge to divert energy away from sensitive storage controller ICs and flash memory power domains. Use Value: 175pF capacitance avoids signal integrity issues on power rails, while ±30kV ESD rating prevents latent damage during manufacturing and field maintenance. |
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, and identical marking (T22); differs only in tape-and-reel packaging (3,000 pcs/reel vs. SC431LI5SK.5TRT's unspecified quantity). | No functional difference; used interchangeably in production where reel size or logistics align. | Select TDS2211P.C when standard Semtech reel configuration is required; verify date code compatibility with Aetrix lot traceability. |
| uClamp2411ZA | 24V VRWM, lower 24A IPP, 0.25pF capacitance, SOD-323 package; optimized for CC/SBU lines-not rated for 40A or 22V power rail duty. | Designed for low-capacitance data-line protection only; cannot replace SC431LI5SK.5TRT on VBUS or load switch inputs. | Use uClamp2411ZA only for auxiliary signal lines; never as direct replacement for SC431LI5SK.5TRT in power rail roles. |
Compared with TDS2211P.C, SC431LI5SK.5TRT offers identical protection performance but may differ in reel logistics; compared with uClamp2411ZA, SC431LI5SK.5TRT provides 67% higher surge current rating and 10× higher capacitance-making it suitable for power rails, not data lines.
Availability
SC431LI5SK.5TRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch protection circuits, and IoT edge node 22V power bus designs requiring stable component supply and full IEC 61000-4-x compliance.
Supply support for SC431LI5SK.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 high-performance analog and mixed-signal semiconductors for power management, protection, and signal integrity.
The SC431LI5SK.5TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered specifically to replace conventional TVS diodes in high-voltage, high-surge industrial and USB PD applications where clamping voltage stability is mission-critical.
FAQ
What is the maximum continuous operating voltage for SC431LI5SK.5TRT?
The SC431LI5SK.5TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously block up to 22V DC without triggering. This makes it suitable for 20V USB PD VBUS rails with safety margin. Exceeding 22V risks premature conduction and potential degradation. Always verify system tolerances and transient margins before deployment.
Does SC431LI5SK.5TRT require a thermal pad on the PCB?
No, SC431LI5SK.5TRT does not require an exposed thermal pad. Its DFN-6 package dissipates surge energy within the silicon FET structure, not through conduction to the board. Layout focus should instead be on low-inductance connections: all GND pins (1–3) and IN pins (4–6) must be tied directly to solid ground and signal planes using multiple vias-no thermal relief needed.
Can SC431LI5SK.5TRT protect high-speed data lines like USB SS or PCIe?
No, SC431LI5SK.5TRT is not suitable for high-speed data lines. Its 175pF junction capacitance would severely degrade signal integrity on SuperSpeed (5+ Gbps) or PCIe lanes. It is designed exclusively for 22V power or low-frequency I/O lines. For data line protection, use low-capacitance devices such as RClamp3371ZC (<0.25pF) alongside SC431LI5SK.5TRT in hybrid protection schemes.
How does SC431LI5SK.5TRT differ from standard TVS diodes in clamping behavior?
Unlike standard TVS diodes-whose clamping voltage rises linearly with surge current (VC = VBR + IPP × RDYN)-the SC431LI5SK.5TRT uses a triggered FET to maintain flat clamping: 27.5–28V at both 24A and 40A. This eliminates design uncertainty caused by temperature- and current-dependent VC drift, making SC431LI5SK.5TRT more predictable in harsh industrial environments.
Is SC431LI5SK.5TRT compatible with lead-free reflow processes?
Yes, SC431LI5SK.5TRT is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020). Its DFN package uses lead-free terminal finish and UL 94V-0 molding compound. Peak reflow temperature must not exceed 260°C for ≤30 seconds. Follow Semtech's recommended land pattern and stencil design to ensure void-free solder joints on all six terminals.
SC431LI5SK.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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SC431LI5SK.5TRT FAQ
1.How can I place an order for SC431LI5SK.5TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LI5SK.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 SC431LI5SK.5TRT reliable?
The price and inventory of SC431LI5SK.5TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LI5SK.5TRT is usually 5 days.
3.What payment methods are accepted for SC431LI5SK.5TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LI5SK.5TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LI5SK.5TRT?
SC431LI5SK.5TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LI5SK.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 SC431LI5SK.5TRT?
For technical support, including SC431LI5SK.5TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LI5SK.5TRT requirements.
6.How does Aetrix verify that SC431LI5SK.5TRT is sourced from the original manufacturer or authorized distributors?
All SC431LI5SK.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 SC431LI5SK.5TRT meets industry standards.
7.What is the process for return or replacement of SC431LI5SK.5TRT?
All SC431LI5SK.5TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LI5SK.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 SC431LI5SK.5TRT part is unused and in its original packaging.
Return procedure for SC431LI5SK.5TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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