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Semtech Corporation SC431LCSK-.5TRT
- Part No.:
- SC431LCSK-.5TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431LCSK-.5TRT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,554
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Product details
Overview
SC431LCSK-.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 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 SC431LCSK-.5TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping stability across temperature and current, low dynamic resistance for minimal voltage overshoot, DFN-6 package integration with multi-pin parallel routing, and compatibility with 22V bus architectures requiring robust surge immunity per IEC 61000-4-5.
Technical Context
The SC431LCSK-.5TRT implements 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-from 24A to 40A and across –40°C to +125°C due to decreasing RDS(on) under surge conditions.
It operates with a 22V reverse stand-off voltage (VRWM) and 25–27.9V reverse breakdown (VBR), delivers 1120W peak pulse power, and exhibits only 175pF junction capacitance at 22V/1MHz-enabling use on high-speed power rails without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22V - Maximum continuous operating voltage before clamping initiates; matches USB PD 20V nominal + margin. |
| VC @ 40A | 27.5–28V - Clamping voltage during full-rated 40A surge (8/20μs + 1.2/50μs combo wave); stays flat across temperature. |
| IPP | 40A - Peak pulse current handling per IEC 61000-4-5; supports industrial ±1kV surge testing (RS = 42Ω). |
| RDYN | 20mΩ - Low dynamic resistance ensures minimal voltage rise under increasing surge current. |
| CJ | 175pF @ 22V/1MHz - Low capacitance avoids loading 22V power rails or interfering with adjacent high-speed signals. |
| ESD Rating | ±30kV contact & air - Full IEC 61000-4-2 Level 4 compliance; eliminates need for external ESD staging. |
| Operating Temp | –40°C to +125°C - Rated for automotive-grade ambient operation without derating clamping performance. |
Pinout & Package
SC431LCSK-.5TRT is housed in a Pb-free, RoHS-compliant DFN-6 package measuring 1.6mm × 1.6mm × 0.55mm with exposed thermal pad not required-energy dissipation occurs within the silicon FET structure. All six terminals are functional and must be connected in parallel for rated surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three pins must be connected to minimize inductance and maximize 40A capability. |
| 4, 5, 6 | IN | Parallel-connected input node tied to protected 22V bus (e.g., USB PD VBus); enables distributed current sharing and low-impedance shunt path. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-clamp architecture | Clamping voltage varies ≤0.5V from 24A to 40A and remains stable from –40°C to +125°C-unlike TVS diodes whose VC rises linearly with IPP and temperature. |
| Surge-rated FET core | Replaces pn-junction avalanche; achieves 20mΩ RDYN and 1120W peak power handling without thermal runaway or degradation. |
| Multi-pin parallel routing | Three-input / three-ground configuration reduces trace inductance and distributes surge current-critical for passing 40A IEC 61000-4-5 tests. |
| Low leakage & capacitance | 600nA max reverse leakage at 22V and 175pF capacitance ensure minimal standby power loss and no signal distortion on power rails. |
Applications
| USB Type-C Power Delivery Bus Protection | Industrial Load Switch Input Protection |
|---|---|
Use Scenario: Protecting the 20–22V VBus line in USB Type-C connectors supporting up to 100W PD, exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Transient diverting suppressor placed directly at the connector, clamping fast-rising transients before they reach the PD controller or e-fuse. Use Value: Maintains 27.5–28V clamping at full 40A surge and across temperature-prevents overvoltage damage to 24V-tolerant PD controllers where standard TVS would exceed safe thresholds. |
Use Scenario: Safeguarding the input of high-side load switches (e.g., HS2950P) in remote meters, robotics, and IoT gateways subjected to field-installed wiring surges. IC Role / Device Role / Timing Role: Primary front-end EOS protector on the VIN rail, absorbing energy before it stresses the load switch's internal MOSFET. Use Value: Limits clamping voltage to ≤28V-well below typical 30V+ absolute maximum ratings of industrial load switches-ensuring reliable operation without derating. |
| Notebook/Tablet Main Power Rail Protection | Storage Device 22V Backup Power Line Protection |
Use Scenario: Securing the main 19–22V system power rail in thin-client notebooks and tablets against ESD events during docking/undocking and AC adapter transients. IC Role / Device Role / Timing Role: Standalone transient suppressor mounted near the DC jack or battery connector, providing first-line defense for PMIC and system-on-chip inputs. Use Value: Delivers ±30kV ESD immunity and 40A surge capacity in a 1.6×1.6mm footprint-enabling compact, high-reliability power rail protection without board area penalty. |
Use Scenario: Protecting 22V backup power lines feeding NVMe SSDs or RAID controllers during hot-swap or power-loss recovery sequences. IC Role / Device Role / Timing Role: EOS guard on the auxiliary 22V supply path, preventing transient coupling into sensitive storage controller logic and flash memory interfaces. Use Value: 175pF capacitance avoids resonance or ringing on long PCB traces; stable clamping ensures consistent voltage margin during repeated surge events in enterprise storage enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDS2211P | Same die, identical electrical specs and package; SC431LCSK-.5TRT is Semtech's alternate marking for TDS2211P per official ordering documentation. | No functional difference; used interchangeably in BOMs and layout designs. | Select SC431LCSK-.5TRT when sourcing from Aetrix Electronics' inventory-same device, same performance, same qualification. |
| SMAJ22A | Standard unidirectional TVS diode; 22V VRWM, 35.5V VC @ 12.5A, 1000W PPPK; higher clamping, fixed RDYN, degrades with temperature. | Lower surge rating (12.5A vs. 40A); unsuitable for IEC 61000-4-5 ±1kV testing without derating or parallel devices. | Consider only for cost-sensitive, low-energy applications where clamping voltage margin >7V is acceptable and temperature stability is non-critical. |
Compared with TDS2211P (identical part) and SMAJ22A (conventional TVS), SC431LCSK-.5TRT delivers superior surge robustness and thermal stability-enabling single-device compliance with industrial surge standards while reducing design margin risk and eliminating thermal derating calculations.
Availability
SC431LCSK-.5TRT is available at Aetrix Electronics and suitable for USB Type-C power delivery systems, industrial load switch inputs, and notebook 22V power rail protection requiring stable component supply, full IEC 61000-4-2/4-5 compliance, and high-reliability surge immunity.
Supply support for SC431LCSK-.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 connectivity solutions.
The TDS family-including SC431LCSK-.5TRT-is engineered specifically for high-energy EOS protection in 12–36V power and interface rails, replacing legacy TVS diodes with FET-based clamping for stable, temperature-invariant surge suppression.
FAQ
What is the exact relationship between SC431LCSK-.5TRT and TDS2211P?
SC431LCSK-.5TRT is Semtech's alternate orderable part number for the TDS2211P device. Both share identical die, electrical specifications, package dimensions (DFN-6, 1.6×1.6×0.55mm), marking code "T22", and qualification data per Rev 2.5 datasheet. No functional or parametric differences exist between SC431LCSK-.5TRT and TDS2211P.
Does SC431LCSK-.5TRT require a thermal pad or heatsink on the PCB?
No. SC431LCSK-.5TRT dissipates surge energy within its integrated FET structure-not via junction heating-and does not require an exposed thermal pad or heatsink. The datasheet explicitly states "no thermal pad is needed," and the DFN-6 package uses standard solder land patterns without thermal vias or copper pour requirements.
Can SC431LCSK-.5TRT protect bidirectional data lines like USB DP/DM?
No. SC431LCSK-.5TRT is designed exclusively for unidirectional 22V power or I/O line protection (e.g., VBus, load switch input). Its pinout and internal architecture do not support bidirectional signal clamping. For DP/DM lines, Semtech recommends low-capacitance TVS devices such as RClamp3371ZC, which are specified for high-speed differential data paths.
What is the maximum recommended trace length between SC431LCSK-.5TRT and the protected connector?
Semtech recommends placing SC431LCSK-.5TRT as close as possible to the connector-ideally within 5mm-to minimize parasitic inductance. Longer traces increase voltage overshoot during fast ESD events (e.g., 15kV contact discharge), potentially exceeding the 28V clamping limit. Layout guidelines specify direct, short, wide traces connecting all IN and GND pins in parallel.
Is SC431LCSK-.5TRT compliant with automotive AEC-Q200 or AEC-Q101 standards?
No. SC431LCSK-.5TRT is qualified for industrial temperature range (–40°C to +125°C) and meets IEC 61000-4-2/4-4/4-5, but it is not AEC-Q200 or AEC-Q101 certified. For automotive applications requiring AEC qualification, Semtech offers separate AEC-Q200-qualified TDS variants-SC431LCSK-.5TRT is intended for industrial, computing, and consumer power rail protection only.
SC431LCSK-.5TRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
SC431LCSK-.5TRT FAQ
1.How can I place an order for SC431LCSK-.5TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LCSK-.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 SC431LCSK-.5TRT reliable?
The price and inventory of SC431LCSK-.5TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LCSK-.5TRT is usually 5 days.
3.What payment methods are accepted for SC431LCSK-.5TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LCSK-.5TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LCSK-.5TRT?
SC431LCSK-.5TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LCSK-.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 SC431LCSK-.5TRT?
For technical support, including SC431LCSK-.5TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LCSK-.5TRT requirements.
6.How does Aetrix verify that SC431LCSK-.5TRT is sourced from the original manufacturer or authorized distributors?
All SC431LCSK-.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 SC431LCSK-.5TRT meets industry standards.
7.What is the process for return or replacement of SC431LCSK-.5TRT?
All SC431LCSK-.5TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431LCSK-.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 SC431LCSK-.5TRT part is unused and in its original packaging.
Return procedure for SC431LCSK-.5TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431LCSK-.5TRT Tags
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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