SC431CS-1.TRT

Overview

The SC431CS-1.TRT is an adjustable shunt voltage reference manufactured by Semtech Corporation, housed in a SOT-23-3 surface-mount package. It functions as a three-terminal device where the output voltage is programmable via two external resistors, ranging from the internal reference threshold of 2.5V up to 30V. The component features a typical dynamic output impedance of 0.25Ω and operates within a current range of 130µA to 150mA. It includes a trimmed bandgap design with +0.5% accuracy and supports industrial temperature ranges.

Feature Summary

• Three-terminal adjustable shunt regulator architecture with sharp turn-on characteristics suitable for replacing Zener diodes
• Trimmed bandgap design ensuring thermal stability and high precision across operating conditions
• Low dynamic output impedance providing stable regulation performance under varying load conditions

Applications

• Linear regulators requiring precise voltage referencing
• Adjustable power supply circuits
• Switching power supplies utilizing shunt regulation
• Battery-operated computer systems needing low-power references
• Instrumentation and computer disk drive control circuits

Procurement Notes

Verify end-of-life status and availability through authorized distributors, as this component may be discontinued or subject to limited supply constraints. Confirm RoHS compliance and lead-free packaging specifications against current manufacturing data sheets before procurement. Ensure the SOT-23-3 package footprint matches your PCB design requirements. Validate that the 2.5V to 30V adjustment range meets your specific circuit voltage needs.

Selection Notes

Select this component when a low-cost, high-precision adjustable reference is needed in a compact SOT-23-3 package. It serves as a direct alternative to TL1431, TL431, LM431, and AS431 devices. Consider its 130µA minimum operating current for battery-powered applications. Ensure the external resistor network can support the desired output voltage up to 30V while maintaining the required accuracy tolerance.

Part Context

The SC431 series belongs to Semtech's portfolio of programmable precision references, designed for general-purpose voltage regulation tasks. This specific model utilizes a standard SOT-23-3 package, making it suitable for space-constrained designs. It is part of a broader family of shunt regulators that offer interchangeable functionality with industry-standard parts like the TL431, facilitating easy upgrades or replacements in existing designs without significant circuit modifications.

Replacement Considerations

This component is functionally compatible with TL1431, TL431, LM431, and AS431 shunt regulators. Verify pinout compatibility and package dimensions (SOT-23-3) when substituting. Ensure the replacement device supports the same 2.5V to 30V output range and similar dynamic impedance characteristics for equivalent performance.