TL431CDG

Overview

The TL431CDG is a three-terminal programmable shunt regulator diode from onsemi, housed in an SOIC-8 package. It operates as a low temperature coefficient zener reference, programmable from Vref to 36 V using two external resistors. The device supports a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It features a reference input voltage tolerance of ±2.2% and an equivalent full-range temperature coefficient of 50 ppm/°C. The component functions effectively as a positive or negative voltage reference and is designed for operation within an ambient temperature range of 0 °C to +70 °C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor network
• Temperature compensated for stable operation across the rated ambient temperature range
• Low dynamic output impedance ensuring precise regulation under varying load conditions

Applications

• Digital voltmeters
• Power supplies
• Op amp circuitry

Procurement Notes

Verify the specific suffix 'CDG' corresponds to the SOIC-8 package and the 0 °C to +70 °C industrial temperature grade. Confirm that the ±2.2% tolerance aligns with system requirements, as other variants offer tighter precision. Ensure the ordering code matches the required shipping configuration, such as rail or tape and reel quantities, before finalizing procurement.

Selection Notes

Select this component when a standard voltage reference is insufficient and a programmable threshold is required. The SOIC-8 package suits surface-mount designs needing compact footprints. Consider the ±2.2% tolerance and 0 °C to +70 °C operating range against application constraints. For automotive environments requiring AEC-Q100 qualification, alternative prefixes like NCV are necessary.

Part Context

This part belongs to the TL431A, B series of programmable precision references manufactured by onsemi. These monolithic ICs serve as direct replacements for traditional zener diodes in various analog circuits. The family includes variants with different tolerances and temperature grades, offering flexibility for diverse power management and feedback control applications.

Replacement Considerations

Direct substitutes include TL431ACDR2G (SOIC-8, 1.0% tolerance) and TL431BCDG (SOIC-8, 0.4% tolerance). For wider temperature ranges, consider TL431AIDG (-40 °C to 85 °C). Automotive applications require NCV431AIDR2G or SCV431AIDMR2G variants.