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Semtech Corporation SC431CSK-1TRT
- Part No.:
- SC431CSK-1TRT
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431CSK-1TRT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,681
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Product details
Overview
SC431CSK-1TRT 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 stable 27.5–28V clamping across temperature (−40°C to +125°C) and current (24–40A), enabling robust USB PD and load switch input protection.
For engineers reviewing the SC431CSK-1TRT datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage stability under surge, low dynamic resistance (20mΩ), junction capacitance (175pF @ 22V), DFN 1.6×1.6mm package constraints, and compatibility with industrial, USB Type-C, and IoT bus protection layouts.
Technical Context
The SC431CSK-1TRT uses a surge-rated FET as its primary protection element, activated by a precision trigger circuit when transient voltage exceeds breakdown. Unlike conventional TVS diodes, its clamping voltage remains nearly constant due to decreasing RDS(on) under increasing current - not fixed RDYN-based rise.
It operates across −40°C to +125°C ambient, with reverse stand-off voltage (VRWM) of 22V, breakdown voltage (VBR) of 25–27.9V, and guaranteed clamping at 27.5–28V for 24A and 40A pulses (1.2/50μs + 8/20μs combination waveform, RS = 2Ω). Its 175pF capacitance at 22V supports moderate-speed data/power line use without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | 22V VRWM - defines maximum continuous operating voltage before clamping activation. |
| Clamping Voltage | 27.5–28V at 40A (8/20μs + 1.2/50μs combo wave) - ensures protected ICs (e.g., USB PD controllers) remain below damage threshold. |
| Peak Pulse Current | 40A (8/20μs) - meets IEC 61000-4-5 Level 4 surge immunity for industrial equipment and USB PD inputs. |
| ESD Withstand | ±30kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD requirements without external staging. |
| Dynamic Resistance | 20mΩ (measured 1–40A, 8/20μs) - enables flat clamping response and minimizes voltage overshoot during fast transients. |
| Junction Capacitance | 175pF @ 22V, 1MHz - compatible with USB PD VBUS and load switch inputs where <500pF is acceptable. |
Pinout & Package
SC431CSK-1TRT is housed in a Pb-free, RoHS-compliant DFN package measuring 1.6mm × 1.6mm × 0.55mm with 6 leads and UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | GND | Common ground return path for surge current; all three must be connected to maximize current handling and minimize parasitic inductance. |
| 4, 5, 6 | IN | Protected line input (e.g., VBUS or power rail); parallel connection of all three pins reduces trace inductance and improves surge sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant clamping voltage | 27.5–28V across full 24–40A surge range and −40°C to +125°C - eliminates thermal derating uncertainty vs. TVS diodes. |
| FET-based shunt architecture | Surge-rated MOSFET + precision trigger circuit - achieves sub-0.1Ω effective RDS(on), enabling low-voltage clamping independent of current magnitude. |
| Low dynamic resistance | 20mΩ - minimizes IR drop during surge, preserving clamping accuracy and reducing localized heating. |
| High EFT immunity | ±4kV per IEC 61000-4-4 (5/50ns, 5kHz & 100kHz) - protects against repetitive burst noise in industrial control and metering environments. |
Applications
| USB Type-C Power Delivery Protection | Industrial Load Switch Input Protection |
|---|---|
|
Use Scenario: Protecting VBUS lines in USB Type-C receptacles supporting up to 20V/5A PD profiles against lightning surges and connector ESD. IC Role / Device Role / Timing Role: Primary EOS suppressor placed directly at the connector, shunting transients before they reach the PD controller or load switch. Use Value: Maintains 28V clamping at 40A and 125°C - stays 10V below typical 38V PD controller absolute max rating, eliminating thermal margin risk. |
Use Scenario: Safeguarding enable and input rails of high-side load switches (e.g., HS2950P) in remote meters, robotics, and factory automation systems. IC Role / Device Role / Timing Role: Front-end transient guard that prevents gate oxide damage and overvoltage latch-up in integrated FET load switches. Use Value: Clamps within 28V while delivering 40A surge current - keeps switch drain-source voltage below breakdown limits during 1kV/42Ω IEC 61000-4-5 events. |
| IoT Edge Device Power Bus Protection | Storage Device DC Power Input Protection |
|
Use Scenario: Securing 12–22V DC input rails of battery-backed smart sensors and gateway modules exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Single-component, space-efficient alternative to stacked TVS+MOV solutions on compact PCBs with limited layer count. Use Value: 1.6×1.6mm DFN footprint saves >60% board area vs. SO-8 TVS; 175pF capacitance avoids signal distortion on shared power/data rails. |
Use Scenario: Hardening SATA or NVMe SSD power inputs against hot-plug transients, ESD during handling, and conducted surges from host backplanes. IC Role / Device Role / Timing Role: Standalone clamping device on +3.3V/+12V/+20V supply lines upstream of PMICs and storage controllers. Use Value: ±30kV ESD rating and 4kV EFT immunity meet enterprise SSD qualification standards (JEDEC JESD22-A114, IEC 61000-4-2/4); RoHS/REACH compliance supports global deployment. |
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 (T22), and same tape-and-reel packaging (3,000 pcs/reel). | No functional difference; TDS2211P.C is the official Semtech orderable part number corresponding to SC431CSK-1TRT. | Select TDS2211P.C when sourcing directly from Semtech or authorized distributors requiring exact manufacturer PN alignment. |
| uClamp2411ZA.TCT | 24V VRWM, lower 24A IPP rating, higher 33V clamping (at 24A), 12pF capacitance - optimized for CC/SBU lines, not VBUS. | Designed for low-capacitance, low-voltage signaling lines (e.g., USB CC, SBU), not 22V power rails; unsuitable for 40A surge duty. | Use uClamp2411ZA.TCT only for auxiliary signal protection; SC431CSK-1TRT remains required for main power rail clamping. |
Compared with TDS2211P.C (identical spec twin) and uClamp2411ZA.TCT (low-capacitance signal variant), SC431CSK-1TRT uniquely balances 40A surge capacity, 22V working voltage, and 28V clamping in a 1.6mm² footprint - making it the sole suitable choice for high-current, high-voltage bus protection where both energy handling and voltage margin are critical.
Availability
SC431CSK-1TRT is available at Aetrix Electronics and suitable for USB Type-C PD interfaces, industrial load switch inputs, and IoT edge device power buses requiring stable component supply, long-term lifecycle support, and consistent surge performance across temperature extremes.
Supply support for SC431CSK-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 SC431CSK-1TRT belongs to Semtech's Transient Diverting Suppressor (TDS) product line, engineered to replace conventional TVS diodes in high-reliability 22V power rail protection where clamping stability across temperature and current is non-negotiable.
FAQ
What is the maximum continuous operating voltage for SC431CSK-1TRT?
The SC431CSK-1TRT has a reverse stand-off voltage (VRWM) of 22V, meaning it can continuously withstand up to 22V DC or RMS without entering clamping mode. This makes SC431CSK-1TRT ideal for protecting USB PD VBUS lines and other 22V-rated power rails where sustained voltage operation is required.
How does SC431CSK-1TRT achieve stable clamping voltage across temperature and current?
SC431CSK-1TRT uses a surge-rated FET activated by a precision trigger circuit instead of a conventional pn-junction TVS. As surge current increases, the FET's RDS(on) decreases, maintaining clamping near the trigger circuit's breakdown voltage. This architecture ensures SC431CSK-1TRT clamps at 27.5–28V from −40°C to +125°C and across 24–40A pulses.
Is SC431CSK-1TRT pin-compatible with standard TVS diodes in DFN packages?
No - SC431CSK-1TRT uses a 6-pin DFN layout with three parallel input pins (4–6) and three parallel ground pins (1–3), unlike typical 2-pin TVS devices. Its pinout requires dedicated PCB routing with multi-pin parallel traces; direct replacement of 2-pin TVS components is not possible without layout revision.
What is the junction capacitance of SC431CSK-1TRT, and how does it affect circuit design?
SC431CSK-1TRT exhibits 175pF junction capacitance at 22V and 1MHz. This value is appropriate for VBUS and power rail protection but too high for high-speed data lines (e.g., USB SS, PCIe). Designers should place SC431CSK-1TRT only on power or low-speed control lines and pair it with sub-0.3pF devices like RClamp3371ZC for data path protection.
Does SC431CSK-1TRT require a thermal pad or heatsink for 40A surge handling?
No - SC431CSK-1TRT dissipates surge energy primarily through its internal FET channel, not junction heating. The datasheet explicitly states no thermal pad is needed. Instead, designers must ensure low-inductance grounding via all three GND pins (1–3) and multiple vias to the ground plane to maintain clamping integrity during 40A transients.
SC431CSK-1TRT 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):
- 2.495V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 130 µA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 150 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SC431CSK-1TRT FAQ
1.How can I place an order for SC431CSK-1TRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431CSK-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 SC431CSK-1TRT reliable?
The price and inventory of SC431CSK-1TRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431CSK-1TRT is usually 5 days.
3.What payment methods are accepted for SC431CSK-1TRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431CSK-1TRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431CSK-1TRT?
SC431CSK-1TRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431CSK-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 SC431CSK-1TRT?
For technical support, including SC431CSK-1TRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431CSK-1TRT requirements.
6.How does Aetrix verify that SC431CSK-1TRT is sourced from the original manufacturer or authorized distributors?
All SC431CSK-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 SC431CSK-1TRT meets industry standards.
7.What is the process for return or replacement of SC431CSK-1TRT?
All SC431CSK-1TRT units undergo pre-shipment inspection (PSI). If there is an issue with SC431CSK-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 SC431CSK-1TRT part is unused and in its original packaging.
Return procedure for SC431CSK-1TRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC431CSK-1TRT Tags
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LM4040DIM3X-2.5/NOPB
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