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Semtech Corporation SC431LCSK-1TRT.P2
- Part No.:
- SC431LCSK-1TRT.P2
- Manufacturer:
- Semtech Corporation
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SC431LCSK-1TRT.P2.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,494
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Product details
Overview
SC431LCSK-1TRT.P2 from Semtech is a three-terminal adjustable shunt regulator with 0.25% initial reference voltage tolerance, 1.24 V to 20 V programmable output range via two external resistors, and 0.05 Ω typical dynamic output impedance. It operates from 100 µA to 100 mA cathode current and replaces Zener diodes in precision voltage reference and feedback applications.
For engineers reviewing the SC431LCSK-1TRT.P2 datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23-3 package, thermal stability over –40°C to +125°C, low dynamic impedance, and compatibility with TLV431A upgrade paths in switching power supply feedback loops.
Technical Context
The SC431LCSK-1TRT.P2 implements a trimmed bandgap reference core with active output circuitry enabling sharp turn-on characteristics and stable regulation down to 1.24 V. Its cathode current range (100 µA–100 mA) and low 0.05 Ω dynamic impedance support high-accuracy feedback in isolated DC-DC converters.
It features ±0.25% reference voltage tolerance at 25°C, temperature coefficient of ≤20 ppm/°C over –40°C to +125°C, and off-state cathode leakage <0.5 µA at 6 V. The device is specified for industrial temperature range and RoHS-compliant lead-free packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.240 V ±0.25% at 25°C - sets minimum programmable output and defines accuracy baseline for feedback loop design. |
| Cathode Current Range | 100 µA to 100 mA - supports operation across light-load standby and full-load regulation without external biasing. |
| Dynamic Output Impedance | 0.05 Ω typical - minimizes output voltage deviation under transient load changes in closed-loop systems. |
| Temperature Range | –40°C to +125°C ambient - enables use in industrial and automotive under-hood environments without derating. |
| Package | SOT-23-3 - surface-mount footprint compatible with standard pick-and-place and reflow processes; 2.9 mm × 1.3 mm body size. |
| Reference Voltage TC | ≤20 ppm/°C - ensures <±10 mV drift over full temperature range, critical for stable feedback in precision supplies. |
| Off-State Cathode Leakage | 0.5 µA max at VZ = 6 V - reduces quiescent power loss in battery-operated systems during shutdown. |
Pinout & Package
SOT-23-3 package: 2.9 mm × 1.3 mm × 1.0 mm body, gull-wing leads, RoHS-compliant lead-free finish. Thermal resistance θJA = 365°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Output terminal / regulated voltage node | Connects to feedback divider top node; sinks current to maintain VREF across R1–R2 network. |
| Anode (A) | Ground reference / return path | Low-impedance return for cathode current; must be tied to system ground with minimal trace inductance. |
| Reference (REF) | Feedback input / precision reference sense | High-impedance node sensing voltage divider midpoint; determines regulated output via VOUT = VREF(1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output from 1.24 V to 20 V | Enables single BOM part to support multiple output rails using only two external resistors-reduces inventory and design complexity. |
| 0.25% initial VREF tolerance | Eliminates need for post-production trimming in most applications, improving yield and reducing calibration cost. |
| 0.05 Ω dynamic output impedance | Provides tight regulation during fast load transients, essential for maintaining stability in flyback and forward converter feedback paths. |
| Industrial temperature range (–40°C to +125°C) | Validates performance across extended environmental conditions without thermal derating-critical for motor control and industrial PLC designs. |
| Lead-free, RoHS/WEEE compliant | Meets global environmental compliance requirements and supports automated assembly with standard Pb-free reflow profiles. |
Applications
| Switching Power Supply Feedback | Battery-Operated Instrumentation |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for AC/DC adapters and industrial power supplies. IC Role / Device Role / Timing Role: Precision shunt reference providing error signal to optocoupler input, closing the regulation loop. Use Value: 0.25% VREF tolerance and 0.05 Ω impedance ensure ±1% output accuracy across line/load/temperature without secondary-side controller IC. |
Use Scenario: Low-power analog front-end reference in handheld multimeters and portable data loggers. IC Role / Device Role / Timing Role: Stable 1.24 V reference for ADC biasing and sensor excitation circuits. Use Value: 100 µA minimum operating current enables operation from coin-cell batteries for >1 year; low leakage preserves battery life during sleep mode. |
| Computer Disk Drive Power | Industrial Motor Control Feedback |
Use Scenario: Regulated 3.3 V or 5 V rail generation for spindle and actuator driver ICs in HDDs and SSD controllers. IC Role / Device Role / Timing Role: Shunt regulator in linear post-regulator stage, stabilizing switching converter outputs. Use Value: Sharp turn-on characteristic prevents oscillation during startup transients; SOT-23-3 footprint saves board space in dense drive electronics. |
Use Scenario: Isolated gate driver bias supply and current-sense amplifier reference in 3-phase inverter modules. IC Role / Device Role / Timing Role: High-stability reference for analog signal conditioning in harsh EMI environments. Use Value: ≤20 ppm/°C TC and –40°C to +125°C operation ensure consistent gain and offset calibration across motor thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 0.5% VREF tolerance, 1.24 V to 18 V range, 0.2 Ω dynamic impedance, SOT-23-5 package | Higher tolerance and impedance reduce closed-loop accuracy; requires 5-pin layout vs. 3-pin simplicity of SC431LCSK-1TRT.P2 | Select when legacy TI-based designs require drop-in replacement with minimal schematic change but accept relaxed regulation specs. |
| AS431ASTZTR-G1 | 1.0% VREF tolerance, 1.24 V to 20 V range, 0.1 Ω dynamic impedance, SOT-23-3 package | Lower accuracy and higher impedance limit use in high-precision feedback; same footprint enables PCB reuse. | Choose for cost-sensitive industrial applications where ±2% output tolerance is acceptable and SOT-23-3 compatibility is mandatory. |
Compared with TLV431ACDBVR and AS431ASTZTR-G1, SC431LCSK-1TRT.P2 delivers superior initial accuracy and lower dynamic impedance in the same compact SOT-23-3 package-making it optimal for high-performance isolated power supplies requiring minimal component count and maximum regulation fidelity.
Availability
SC431LCSK-1TRT.P2 is available at Aetrix Electronics and suitable for switching power supply feedback, battery-operated instrumentation, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SC431LCSK-1TRT.P2 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 semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, protection, and signal integrity.
The SC431L family was designed for precision voltage reference and feedback applications in isolated DC-DC converters, offering upgrade paths from legacy TLV431A while delivering tighter tolerance and lower impedance in compact packages.
FAQ
What is the minimum cathode current required for stable regulation in SC431LCSK-1TRT.P2?
The SC431LCSK-1TRT.P2 requires a minimum cathode current of 100 µA to maintain regulation across its full temperature range. Below this threshold, reference voltage accuracy degrades and turn-on behavior becomes unpredictable. Designers must ensure resistor divider values guarantee ≥100 µA at the lowest expected input voltage and highest temperature per datasheet Equation 2.
Can SC431LCSK-1TRT.P2 replace a Zener diode directly in existing circuits?
Yes, SC431LCSK-1TRT.P2 can directly replace Zener diodes in most shunt regulator configurations. Its sharp turn-on characteristic, low dynamic impedance (0.05 Ω), and adjustable output via two resistors provide superior regulation accuracy and thermal stability compared to discrete Zeners. No PCB layout changes are needed when substituting into SOT-23-3 footprints.
What is the maximum output voltage achievable with SC431LCSK-1TRT.P2?
The SC431LCSK-1TRT.P2 supports an output voltage range from 1.24 V up to 20 V, set by external resistors R1 and R2 using the formula VOUT = VREF(1 + R1/R2). The absolute maximum cathode-to-anode voltage is 20 V per Absolute Maximum Ratings, so VOUT must not exceed this limit regardless of resistor selection.
How does SC431LCSK-1TRT.P2 handle capacitive loading on its cathode node?
The SC431LCSK-1TRT.P2 exhibits instability with 10 nF to 1 µF capacitance directly across cathode and anode at light loads (<3 mA). For stable operation, use either no cathode capacitor (relying on load-side decoupling) or ≥10 µF. If the device is placed adjacent to the load, the local decoupling cap must be ≤1 nF or ≥10 µF to avoid oscillation during startup transients.
Is SC431LCSK-1TRT.P2 RoHS compliant and lead-free?
Yes, SC431LCSK-1TRT.P2 is fully RoHS and WEEE compliant with lead-free terminations. The "T" suffix in the part number confirms lead-free packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for standard reflow processing without special handling.
SC431LCSK-1TRT.P2 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:
- ±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-23-3
SC431LCSK-1TRT.P2 FAQ
1.How can I place an order for SC431LCSK-1TRT.P2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC431LCSK-1TRT.P2 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-1TRT.P2 reliable?
The price and inventory of SC431LCSK-1TRT.P2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC431LCSK-1TRT.P2 is usually 5 days.
3.What payment methods are accepted for SC431LCSK-1TRT.P2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC431LCSK-1TRT.P2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC431LCSK-1TRT.P2?
SC431LCSK-1TRT.P2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC431LCSK-1TRT.P2 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-1TRT.P2?
For technical support, including SC431LCSK-1TRT.P2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC431LCSK-1TRT.P2 requirements.
6.How does Aetrix verify that SC431LCSK-1TRT.P2 is sourced from the original manufacturer or authorized distributors?
All SC431LCSK-1TRT.P2 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-1TRT.P2 meets industry standards.
7.What is the process for return or replacement of SC431LCSK-1TRT.P2?
All SC431LCSK-1TRT.P2 units undergo pre-shipment inspection (PSI). If there is an issue with SC431LCSK-1TRT.P2, 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-1TRT.P2 part is unused and in its original packaging.
Return procedure for SC431LCSK-1TRT.P2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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