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Semtech Corporation SC431LI5SK-2TRT
- Part No.:
- SC431LI5SK-2TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SC431LI5SK-2TRT.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
SC431LI5SK-2TRT 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 tightly regulated 27.5–28V clamping voltage across full temperature (−40°C to +125°C) and current range. It is deployed in USB Type-C PD input protection and load switch front-end surge suppression.
For engineers reviewing the SC431LI5SK-2TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability under temperature and surge stress, low dynamic resistance (20 mΩ), junction capacitance (175 pF at 22V), and DFN 1.6×1.6mm 6-lead layout compatibility with high-density USB PD and industrial power interfaces.
Technical Context
The SC431LI5SK-2TRT 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-across 24A to 40A peak pulse current and −40°C to +125°C due to decreasing RDS(on) under surge.
It operates with reverse stand-off voltage (VRWM) of 22V, breakdown voltage (VBR) of 25–27.9V, and ultra-low dynamic resistance (20 mΩ), enabling robust protection for 20–22V bus systems such as USB PD 3.0 and industrial 24V inputs without thermal derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22 V - matches nominal USB PD 3.0 VBUS and industrial 24V rail tolerances. |
| Clamping Voltage | 27.5–28 V at 40A (8/20μs) - stays below 30V damage threshold of common PD controllers and load switches. |
| Peak Pulse Current | 40 A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment. |
| ESD Withstand | ±30 kV contact & air (IEC 61000-4-2) - exceeds USB IF and IEC 61000-4-2 Class 4 requirements. |
| Junction Capacitance | 175 pF at 22 V, 1 MHz - compatible with DC/low-speed power line protection; not for high-speed data lanes. |
| Dynamic Resistance | 20 mΩ - ensures minimal voltage rise under surge, critical for maintaining clamping stability. |
| Operating Temperature | −40°C to +125°C - supports extended-range industrial and automotive under-hood applications. |
Pinout & Package
SC431LI5SK-2TRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6 mm × 1.6 mm × 0.55 mm with 6 leads and UL 94V-0 molding compound. All pins must be soldered for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 2, 3 | GND | Common ground return path; all three must be connected to minimize parasitic inductance during 40A transients. |
| Pins 4, 5, 6 | IN | Protected line input (e.g., VBUS or load switch input); parallel connection ensures current sharing and thermal balance. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5 V across 24–40A and −40°C to +125°C - eliminates thermal derating design margins. |
| Surge-rated FET protection | Replaces traditional TVS diodes with active shunt switching - avoids junction heating and voltage drift under repeated surges. |
| Low dynamic resistance | 20 mΩ enables <1 V IR drop at 40A - preserves system-level voltage integrity during surge events. |
| High EFT immunity | ±4 kV per IEC 61000-4-4 (5/50 ns, 100 kHz/5 kHz) - protects against repetitive fast transients in motor drives and PLCs. |
| Space-efficient packaging | 1.6 × 1.6 mm footprint saves >60% board area vs. SO-8 or SOT-23 TVS solutions - ideal for compact USB-C ports. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB-C receptacles supporting up to 20V/5A PD 3.0 operation against lightning-induced surges and connector hot-plug ESD. IC Role / Device Role / Timing Role: Primary front-end EOS suppressor placed between connector and PD controller/load switch, clamping transients before they reach sensitive silicon. Use Value: Maintains 27.5–28V clamping across temperature and current - prevents overvoltage damage to USB PD controllers rated for ≤30V absolute max. |
Use Scenario: Front-end protection of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways exposed to 24V rail surges. IC Role / Device Role / Timing Role: Shunt-based transient diverter that activates within nanoseconds to divert 40A surges away from the load switch's internal FET. Use Value: Keeps clamping voltage below the 30V drain-source breakdown of typical 30V load switches - avoids catastrophic failure during IEC 61000-4-5 testing. |
| Notebook/Tablet VBUS Line Protection | Industrial Equipment 24V Input Protection |
|
Use Scenario: Securing main power input rails in thin-client notebooks and tablets where space constraints limit use of larger TVS arrays. IC Role / Device Role / Timing Role: Single-component 22V-rated suppressor replacing multi-diode TVS stacks - simplifies BOM and layout. Use Value: 175 pF capacitance and 1.6 mm² footprint enable integration near USB-C connectors without signal integrity impact or PCB real estate penalty. |
Use Scenario: Surge protection for 24V auxiliary power inputs in programmable logic controllers (PLCs), HMIs, and factory automation sensors. IC Role / Device Role / Timing Role: Robust EOS guard for unregulated 24V inputs subject to long-line inductive switching and nearby lightning coupling. Use Value: Rated for −40°C to +125°C operation and ±1 kV (1.2/50 μs) surge - meets EN 61000-4-5 Level 3 for industrial environments. |
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 1.6×1.6mm package, identical marking code T22 - direct Semtech second-source variant. | No functional difference; used interchangeably in USB-C and industrial designs per Semtech documentation. | Select when requiring Semtech-certified tape-and-reel logistics or alternate date-code traceability. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.3A - higher clamping, no temperature stability, fixed RDYN ≈ 1.2 Ω. | Limited to lower-energy transients; unsuitable for 40A surges or high-temp industrial use due to VC drift. | Consider only for cost-sensitive, non-critical 22V lines where clamping voltage margin >8V is acceptable. |
Compared with TDS2211P.C and SMAJ22A, SC431LI5SK-2TRT offers identical performance to TDS2211P.C but differs from SMAJ22A in clamping stability, surge rating, and temperature behavior - making it the sole choice for USB PD 3.0 and industrial 24V systems demanding consistent 28V clamping under worst-case conditions.
Availability
SC431LI5SK-2TRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and notebook/tablet VBUS protection requiring stable component supply, full-temperature-range reliability, and high-surge resilience.
Supply support for SC431LI5SK-2TRT 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.
SC431LI5SK-2TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 20–24V power rail protection where clamping stability and surge endurance are critical.
FAQ
What is the maximum clamping voltage of SC431LI5SK-2TRT at 40A surge current?
The SC431LI5SK-2TRT clamps at 27.5–28 V under 40A peak pulse current (8/20μs waveform, 2Ω source impedance), as specified in its electrical characteristics table. This value remains stable across −40°C to +125°C operating temperature, distinguishing it from conventional TVS devices whose clamping rises with current and temperature. The SC431LI5SK-2TRT achieves this via a low-RDS(on) FET shunt architecture.
Does SC431LI5SK-2TRT support bidirectional ESD protection?
Yes, SC431LI5SK-2TRT provides symmetrical ±30kV ESD protection per IEC 61000-4-2 (contact and air discharge), confirmed by its absolute maximum ratings and test methodology. Its internal FET-trigger architecture enables equal clamping response for positive and negative transients on the IN-to-GND path, making it suitable for DC power lines like USB PD VBUS where polarity is fixed but surge direction is unpredictable.
Can SC431LI5SK-2TRT be used on high-speed data lines such as USB SuperSpeed differential pairs?
No, SC431LI5SK-2TRT is not suitable for USB SuperSpeed (SS), DisplayPort, or other high-speed data lanes. Its 175 pF junction capacitance at 22V would severely degrade signal integrity on >1 Gbps links. It is specifically designed for DC or low-frequency power and control lines - e.g., VBUS, CC, SBU, or load switch enable inputs - where capacitance is non-critical. For SS lines, Semtech recommends RClamp3371ZC (<0.25 pF).
What is the recommended PCB layout for optimal surge performance of SC431LI5SK-2TRT?
Place SC431LI5SK-2TRT as close as possible to the protected connector (e.g., USB-C receptacle). Connect all three IN pins (4,5,6) via a single short, wide trace to the protected line, and tie all three GND pins (1,2,3) directly to a solid ground plane using multiple vias. Avoid thermal relief on GND pads. This minimizes parasitic inductance and ensures full 40A current sharing across parallel paths - essential for achieving rated surge performance per Semtech's layout guidelines.
Is SC431LI5SK-2TRT compliant with RoHS and halogen-free standards?
Yes, SC431LI5SK-2TRT 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. This compliance is documented in the mechanical characteristics section of the official Semtech TDS2211P datasheet, which applies identically to SC431LI5SK-2TRT as a functionally and physically equivalent variant.
SC431LI5SK-2TRT 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:
- ±2%
- 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-2TRT FAQ
1.How can I place an order for SC431LI5SK-2TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LI5SK-2TRT 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-2TRT reliable?
The price and inventory of SC431LI5SK-2TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LI5SK-2TRT is usually 5 days.
3.What payment methods are accepted for SC431LI5SK-2TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LI5SK-2TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LI5SK-2TRT?
SC431LI5SK-2TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LI5SK-2TRT 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-2TRT?
For technical support, including SC431LI5SK-2TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LI5SK-2TRT requirements.
6.How does Aetrix verify that SC431LI5SK-2TRT is sourced from the original manufacturer or authorized distributors?
All SC431LI5SK-2TRT 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-2TRT meets industry standards.
7.What is the process for return or replacement of SC431LI5SK-2TRT?
All SC431LI5SK-2TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LI5SK-2TRT, 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-2TRT part is unused and in its original packaging.
Return procedure for SC431LI5SK-2TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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