TL431ACDR2G

Overview

The TL431ACDR2G is a three-terminal programmable shunt regulator diode from onsemi, operating within the TL431A series. It functions as a low temperature coefficient Zener reference programmable from Vref to 36 V using two external resistors. The device features a typical voltage reference tolerance of ±1% and an equivalent full-range temperature coefficient of 50 ppm/°C. It supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. Designed for surface mount applications, it utilizes an SOIC-8 package (D Suffix) and operates over an ambient temperature range of 0 °C to +70 °C.

Feature Summary

• Programmable output voltage capability up to 36 V via external resistor divider
• Temperature compensated operation across the full rated ambient temperature range
• Low dynamic output impedance ensuring stable regulation under varying load conditions
• Pb-Free construction compliant with RoHS standards

Applications

• Digital voltmeters requiring precise reference voltages
• Power supply feedback control circuits driving optocouplers
• Op amp circuitry serving as stable voltage references
• Constant current sources and sinks
• Voltage monitor circuits with defined trip points

Procurement Notes

Verify the specific suffix 'ACDR2G' confirms the ±1% tolerance grade, SOIC-8 package, and 0°C to +70°C operating range. Confirm RoHS compliance status matches project requirements. Ensure the ordering code aligns with the Tape & Reel shipping format specified in the manufacturer's documentation. Cross-reference the device marking code for authenticity.

Selection Notes

Select this component when a precision shunt regulator is needed for standard industrial temperature ranges. The ±1% initial accuracy suits applications demanding tighter tolerances than standard Zener diodes. Consider the SOIC-8 footprint for PCB space constraints. Evaluate stability boundary conditions if significant load capacitance is present in the design.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. It serves as a direct replacement for traditional Zener diodes in many analog and digital applications. The family includes variants with different temperature grades and automotive qualifications, such as the NCV prefix series.

Replacement Considerations

TL431CDR2G offers ±2.2% tolerance. TL431BCDR2G provides ±0.4% tolerance. NCV431AIDR2G extends the operating range to -40°C to +85°C with AEC-Q100 qualification.