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Semtech Corporation SC431LC5SK25TRT
- Part No.:
- SC431LC5SK25TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC431LC5SK25TRT.pdf
- Description:
- IC VREF SHUNT ADJ 0.25% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,177
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Product details
Overview
SC431LC5SK25TRT 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, and 20mΩ dynamic resistance. It protects USB PD, USB Type-C VBus, and load switch inputs in industrial and portable electronics.
For engineers reviewing the SC431LC5SK25TRT 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 for space-constrained interfaces, and compatibility with 22V operating bus architectures.
Technical Context
The SC431LC5SK25TRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit that senses overvoltage events and rapidly shunts transient current to ground. Unlike conventional TVS diodes, its clamping voltage remains nearly constant-27.5–28V-across 24A to 40A peak pulse currents and from –40°C to +125°C.
This behavior stems from the FET's decreasing RDS(on) under surge conditions, yielding ultra-low dynamic resistance (20mΩ) and minimal voltage rise with increasing current. The device operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and junction capacitance of 175pF at 22V/1MHz-optimized for high-speed bus protection without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC or RMS operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during worst-case surges. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 industrial surge immunity requirements for 22V systems. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds standard USB/Type-C ESD robustness requirements without degradation. |
| Dynamic Resistance | 20mΩ - enables flat clamping response; eliminates voltage rise with current, unlike TVS diodes whose VC = VBR + IPP×RDYN. |
| Junction Capacitance | 175pF at 22V/1MHz - low enough for VBus protection without distorting PD negotiation signaling or causing excessive insertion loss. |
Pinout & Package
SC431LC5SK25TRT 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 path for surge current; all three pins must be tied to solid ground plane via multiple vias to minimize inductance. |
| 4, 5, 6 | IN | Protected input node (e.g., USB PD VBus); all three pins connect in parallel to the same line to distribute current and reduce trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V across full 24–40A range and –40°C to +125°C-enables reliable margining for safety-critical 22V systems. |
| FET-based shunt topology | Replaces traditional PN-junction TVS with low-RDS(on) MOSFET, eliminating thermal runaway risk and enabling higher sustained surge handling. |
| Low dynamic resistance | 20mΩ measured between 1A–40A (8/20μs) - reduces voltage overshoot during fast-rising transients (e.g., ESD) better than TVS diodes. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive burst noise in industrial motor drives and PLC I/O modules. |
Applications
| USB Power Delivery Protection | USB Type-C VBus Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBus lines in USB PD 3.0/3.1 systems against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary high-energy shunt suppressor placed at connector entry point, upstream of PD controller and load switch. Use Value: Maintains 27.5–28V clamping across temperature-prevents false OVP trips and ensures PD negotiation integrity under real-world ambient conditions. |
Use Scenario: Securing the VBus rail in reversible USB Type-C receptacles where polarity-independent routing demands symmetric protection. IC Role / Device Role / Timing Role: Bidirectional EOS protector with identical IN/GND terminal grouping-no orientation dependency on PCB layout. Use Value: 1.6mm × 1.6mm footprint saves >60% board area vs. SO-8 TVS solutions while delivering superior clamping consistency. |
| Industrial Load Switch Input Protection | IoT Device Power Rail Protection |
|
Use Scenario: Shielding e-fuse or smart load switch inputs (e.g., HS2950P) in remote meters and factory automation nodes from 1kV/42Ω surges. IC Role / Device Role / Timing Role: Front-end transient limiter that clamps before internal FET gate oxide breakdown occurs. Use Value: Keeps clamping voltage below 28V-well under typical 30V+ FET drain-source breakdown-extending switch lifetime in harsh environments. |
Use Scenario: Hardening 22V-capable battery-backed IoT gateways and edge sensors against ESD during field servicing or lightning-induced coupling. IC Role / Device Role / Timing Role: Single-device solution for both ESD and surge, eliminating need for cascaded TVS + MOV networks. Use Value: ±30kV ESD rating and 40A surge capability enable single-BOM protection for global CE/FCC/IEC certification without derating. |
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. SC431LC5SK25TRT's unspecified reel count). | No functional difference; suitable for identical USB PD, Type-C, and industrial use cases. | Select TDS2211P.C when standard Semtech reel quantity and marking (T22 + date code) are required for production traceability. |
| SP1003-02HTG | TVS diode (not TDS architecture); 24V working voltage, 33.2V clamping at 40A, higher RDYN (~150mΩ), clamping rises with temperature and current. | Limited to lower-temperature or lower-current applications where 33.2V clamping margin is acceptable. | Choose SP1003-02HTG only if cost sensitivity outweighs clamping stability needs-and verify 33.2V does not exceed downstream IC absolute max ratings. |
Compared with TDS2211P.C, SC431LC5SK25TRT offers identical protection performance but may differ in reel configuration or date-code marking; compared with SP1003-02HTG, SC431LC5SK25TRT delivers significantly tighter clamping control, lower dynamic impedance, and stable operation across temperature-critical for 22V USB PD and industrial power rails.
Availability
SC431LC5SK25TRT is available at Aetrix Electronics and suitable for USB Power Delivery systems, USB Type-C interface designs, and industrial load switch protection requiring stable component supply, long-term lifecycle assurance, and compliance with IEC 61000-4-2/4-4/4-5 standards.
Supply support for SC431LC5SK25TRT 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 SC431LC5SK25TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line-engineered to replace conventional TVS diodes in high-reliability 22V power rail and interface protection applications where clamping stability and surge robustness are critical.
FAQ
What is the maximum continuous operating voltage for SC431LC5SK25TRT?
The SC431LC5SK25TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can safely block up to 22V DC or RMS voltage continuously without significant leakage or conduction. This makes SC431LC5SK25TRT ideal for protecting 20V USB PD VBus lines and other 22V-rated power rails where sustained voltage margin is essential.
How does SC431LC5SK25TRT 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 SC431LC5SK25TRT uses a triggered FET architecture that maintains near-constant clamping (27.5–28V) from 24A to 40A and across –40°C to +125°C. This eliminates design uncertainty caused by temperature- and current-dependent voltage overshoot in TVS devices.
Can SC431LC5SK25TRT be used for bidirectional signal line protection?
No-SC431LC5SK25TRT is unidirectional and designed exclusively for power rail or single-ended I/O protection (e.g., VBus, load switch input). Its pinout (IN pins 4–6, GND pins 1–3) and internal architecture do not support symmetrical AC or data-line protection. For bidirectional signal lines like USB DP/DM, low-capacitance TVS devices such as RClamp3371ZC are recommended instead of SC431LC5SK25TRT.
What is the recommended PCB layout for optimal surge performance of SC431LC5SK25TRT?
Place SC431LC5SK25TRT as close as possible to the protected connector. Connect all three IN pins (4, 5, 6) together with a short, wide trace to the protected line, and tie all three GND pins (1, 2, 3) directly to a solid ground plane using ≥4 thermal vias. Avoid stubs or splits-this minimizes parasitic inductance and ensures full 40A surge current sharing across terminals, as validated in Semtech's layout guidelines.
Is SC431LC5SK25TRT compliant with RoHS and halogen-free standards?
Yes-SC431LC5SK25TRT is Pb-free, halogen-free, and fully compliant with RoHS and WEEE directives. Its molding compound meets UL 94V-0 flammability rating, and lead finish is lead-free. These compliance attributes are confirmed in the official Semtech TDS2211P datasheet (Rev 2.5), which applies identically to SC431LC5SK25TRT as a variant of the same device family.
SC431LC5SK25TRT 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:
- ±0.25%
- 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
SC431LC5SK25TRT FAQ
1.How can I place an order for SC431LC5SK25TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LC5SK25TRT 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 SC431LC5SK25TRT reliable?
The price and inventory of SC431LC5SK25TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LC5SK25TRT is usually 5 days.
3.What payment methods are accepted for SC431LC5SK25TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LC5SK25TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LC5SK25TRT?
SC431LC5SK25TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LC5SK25TRT 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 SC431LC5SK25TRT?
For technical support, including SC431LC5SK25TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LC5SK25TRT requirements.
6.How does Aetrix verify that SC431LC5SK25TRT is sourced from the original manufacturer or authorized distributors?
All SC431LC5SK25TRT 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 SC431LC5SK25TRT meets industry standards.
7.What is the process for return or replacement of SC431LC5SK25TRT?
All SC431LC5SK25TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LC5SK25TRT, 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 SC431LC5SK25TRT part is unused and in its original packaging.
Return procedure for SC431LC5SK25TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431LC5SK25TRT Tags
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