TL431CSF

Overview

The TL431CSF is a programmable precision shunt regulator manufactured by TAEJIN Technology. It features an adjustable output voltage range from the reference voltage of 2.495V up to 40V, set via two external resistors. The device guarantees a 0.5% reference voltage tolerance and operates with a cathode current range of 0.5mA to 100mA. It exhibits a typical dynamic output impedance of 0.2Ω and an equivalent full-range temperature coefficient of 50PPM/°C. Designed for operation across a temperature range of -40°C to +125°C, it is supplied in a SOT-23-3L package.

Feature Summary

• Programmable output voltage capability extending up to 40V
• Guaranteed 0.5% reference voltage tolerance for high precision
• Low dynamic output impedance ensuring stable regulation
• Temperature compensated for reliable operation over the full rated operating temperature range

Applications

• Shunt Regulator
• Precision High-Current Series Regulator
• High-Current Shunt Regulator
• Crowbar Circuit
• PWM Converter With Reference

Procurement Notes

Verify that the specific part number TL431CSF corresponds to the SOT-23-3L surface-mount package configuration as defined in the manufacturer's ordering information. Confirm that the required tolerance level matches the 0.5% specification associated with this suffix. Ensure the procurement source provides documentation confirming the Tape & Reel supply format specified for this package type.

Selection Notes

Select the TL431CSF when a compact surface-mount solution is required for precision voltage referencing or regulation. This variant is suitable for applications demanding a 0.5% initial accuracy and operation within the extended industrial temperature range of -40°C to +125°C. It serves as a direct replacement for Zener diodes in circuits requiring sharp turn-on characteristics and low dynamic output impedance.

Part Context

The TL431 series represents a family of three-terminal adjustable shunt regulators known for thermal stability and precise voltage control. The TL431CSF specifically utilizes the SOT-23-3L package, offering a smaller footprint compared to through-hole options like TO-92. It maintains the core electrical performance of the series while adapting to surface-mount assembly requirements.

Replacement Considerations

Compatible substitutes include other manufacturers' TL431 variants in SOT-23-3L packages with matching 0.5% tolerance, such as those from Texas Instruments or STMicroelectronics. Verify pinout compatibility and ensure the alternative component meets the same -40°C to +125°C operating temperature range and 40V maximum cathode voltage rating.