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Semtech Corporation SC431LC5SK-1TRT
- Part No.:
- SC431LC5SK-1TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC431LC5SK-1TRT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,047
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Product details
Overview
SC431LC5SK-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 - deployed in USB PD, USB Type-C, and industrial load switch input protection.
For engineers reviewing the SC431LC5SK-1TRT 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 constraints, and compatibility with 22V bus systems requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The SC431LC5SK-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 across 24–40A and −40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with reverse stand-off voltage of 22V, breakdown voltage of 25–27.9V, and forward voltage of 0.5V, enabling reliable protection of 22V power rails without false triggering during normal operation while maintaining sub-28V clamping under worst-case surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V - defines maximum continuous DC operating voltage on protected line without leakage or conduction. |
| Clamping Voltage | 27.5–28V at 24–40A (1.2/50μs + 8/20μs combo wave, RS = 2Ω) - ensures downstream ICs (e.g., USB PD controllers) remain below damage threshold during surge events. |
| 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) - provides robust system-level ESD protection without external shielding or layout mitigation. |
| Dynamic Resistance | 20mΩ - enables flat clamping response and minimizes voltage rise across current range, unlike TVS diodes with fixed RDYN. |
| Junction Capacitance | 175pF at 22V, 1MHz - suitable for DC power rail and low-speed signal line protection; not intended for >100MHz data paths. |
Pinout & Package
SC431LC5SK-1TRT 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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return for surge current; all three must be connected to minimize inductance and maximize 40A capability. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS, load switch input); parallel connection ensures uniform current sharing and optimal surge handling. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A surge range and −40°C to +125°C - eliminates derating concerns common with TVS diodes. |
| Surge-rated FET architecture | Replaces PN-junction TVS with active shunt switch, reducing clamping dependency on junction area and temperature drift. |
| Low dynamic resistance | 20mΩ enables <1V voltage rise from 1A to 40A, delivering superior energy diversion vs. standard TVS (RDYN typically >1Ω). |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 100kHz/5kHz) - protects against repetitive fast transients in industrial control environments. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting 20–22V VBUS lines in USB-C receptacles supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary EOS suppressor placed at connector entry point, clamping transients before reaching PD controller and load switch. Use Value: Maintains ≤28V clamping at 40A and 125°C - prevents overvoltage damage to sensitive PD controllers where standard TVS would exceed 38V at same conditions. |
Use Scenario: Safeguarding input terminals of industrial-grade load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways subject to field surges. IC Role / Device Role / Timing Role: Front-end transient shunt that diverts surge energy away from the load switch's internal FET drain-source path. Use Value: Limits voltage across load switch input to <28V during 1.2/50μs surges - avoids gate oxide stress and drain-source avalanche failure in high-side FETs. |
| Storage Device Power Rail Protection | Notebook/Tablet 22V System Bus Protection |
|
Use Scenario: Securing 22V auxiliary rails in NVMe SSD enclosures and enterprise storage backplanes exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standalone EOS protector on main power input, replacing multi-stage TVS+MLV solutions. Use Value: Single-device 40A surge handling and ±30kV ESD rating reduce BOM count and PCB area versus discrete TVS arrays. |
Use Scenario: Protecting 22V system rails in thin-and-light notebooks and tablets where space and thermal constraints limit traditional protection options. IC Role / Device Role / Timing Role: Compact DFN-6 suppressor mounted adjacent to power connector, minimizing trace inductance for fast ESD response. Use Value: 1.6mm × 1.6mm footprint saves >60% board area vs. SOT-23 TVS solutions while delivering higher surge rating and stable clamping. |
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 (T22), same tape/reel packaging (3,000 pcs/reel). | No functional difference; TDS2211P.C is the official Semtech orderable part number corresponding to SC431LC5SK-1TRT. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors using standard part nomenclature. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A (8/20μs), 3.5Ω RDYN - clamping rises linearly with current and temperature. | Suitable only for lower-energy surges (<15A) or ambient-temperature-limited designs; cannot match SC431LC5SK-1TRT's flat 28V clamping at 40A/125°C. | Choose SMAJ22A only if cost sensitivity outweighs performance requirements and surge levels are confirmed <15A. |
Compared with TDS2211P.C (identical device) and SMAJ22A (conventional TVS), SC431LC5SK-1TRT delivers stable 28V clamping at full 40A and high temperature - enabling smaller, more reliable protection in space-constrained 22V systems where TVS alternatives require derating or multi-device stacking.
Availability
SC431LC5SK-1TRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and 22V storage device power rails requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SC431LC5SK-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 analog and mixed-signal ICs for precision sensing, protection, and connectivity.
The TDS family - including SC431LC5SK-1TRT - was engineered to replace conventional TVS diodes in high-reliability 22V power rail protection, emphasizing flat clamping, temperature stability, and compact DFN packaging for modern portable and industrial systems.
FAQ
What is the exact package type and dimensions of SC431LC5SK-1TRT?
SC431LC5SK-1TRT uses a 6-pin DFN package measuring 1.6mm × 1.6mm × 0.55mm with exposed copper pad. Pin 1 is marked by a laser dot; pins 1–3 are GND, pins 4–6 are IN. The land pattern follows Semtech's recommended layout with multiple vias to ground plane for low-inductance surge return.
Does SC431LC5SK-1TRT support bidirectional or unidirectional transient protection?
SC431LC5SK-1TRT is a unidirectional transient diverting suppressor optimized for positive-going surges on 22V DC rails. Its functional diagram shows a single shunt FET path from IN to GND; it does not clamp negative transients beyond its forward voltage (0.5V), making it unsuitable for AC or bipolar signal line protection.
How does SC431LC5SK-1TRT differ from standard TVS diodes in clamping behavior?
Unlike TVS diodes whose clamping voltage rises linearly with peak current (VC = VBR + IPP × RDYN), SC431LC5SK-1TRT maintains 27.5–28V clamping from 24A to 40A due to its active FET-based architecture and 20mΩ dynamic resistance - eliminating need for over-spec'ing IPP to meet voltage thresholds.
Can SC431LC5SK-1TRT be used on high-speed data lines like USB SuperSpeed or PCIe?
No. With 175pF junction capacitance at 22V, SC431LC5SK-1TRT is intended for DC power rails and low-speed signal lines only. For USB SS, DP/DM, or PCIe lanes, Semtech recommends low-capacitance devices like RClamp3371ZC (<0.25pF), not SC431LC5SK-1TRT.
What is the maximum operating temperature range for SC431LC5SK-1TRT?
SC431LC5SK-1TRT is rated for continuous operation from −40°C to +125°C ambient temperature. Its clamping voltage remains stable across this range - verified in datasheet Figure 3 - unlike TVS diodes whose VC increases significantly above 85°C.
SC431LC5SK-1TRT 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:
- ±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-23-5
SC431LC5SK-1TRT FAQ
1.How can I place an order for SC431LC5SK-1TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LC5SK-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 SC431LC5SK-1TRT reliable?
The price and inventory of SC431LC5SK-1TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LC5SK-1TRT is usually 5 days.
3.What payment methods are accepted for SC431LC5SK-1TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LC5SK-1TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LC5SK-1TRT?
SC431LC5SK-1TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LC5SK-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 SC431LC5SK-1TRT?
For technical support, including SC431LC5SK-1TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LC5SK-1TRT requirements.
6.How does Aetrix verify that SC431LC5SK-1TRT is sourced from the original manufacturer or authorized distributors?
All SC431LC5SK-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 SC431LC5SK-1TRT meets industry standards.
7.What is the process for return or replacement of SC431LC5SK-1TRT?
All SC431LC5SK-1TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LC5SK-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 SC431LC5SK-1TRT part is unused and in its original packaging.
Return procedure for SC431LC5SK-1TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431LC5SK-1TRT Tags
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