TL431ACDMR2G

Overview

The TL431ACDMR2G is a three-terminal programmable shunt regulator IC from onsemi, housed in an 8-MSOP package. It operates as a low temperature coefficient zener reference, programmable from the internal Vref of 2.495 V up to 36 V using two external resistors. The device supports a cathode current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. It features a voltage reference tolerance of ±1% and a full-range temperature coefficient of 50 ppm/°C. The component is rated for operation within an ambient temperature range of 0°C to +70°C.

Feature Summary

• Programmable output voltage capability extending from the internal reference level up to 36 V via external resistor networks.
• Temperature compensated design ensuring stable performance across the full rated operating temperature range.
• Low dynamic output impedance characteristic providing high regulation precision under varying load conditions.

Applications

• Feedback control loops driving optocouplers in switching power supplies
• Digital voltmeter reference circuits
• Op amp circuitry requiring stable biasing
• Constant current sources and sinks

Procurement Notes

Verify that the specific part number matches the required package suffix and tolerance grade. Confirm the operating temperature range aligns with system requirements, as other variants exist for wider ranges. Check for automotive qualification prefixes if AEC-Q100 compliance is necessary for the target application environment.

Selection Notes

Select this component when a precise, adjustable shunt reference is needed within the commercial temperature range. Ensure the external resistor values allow the desired output voltage while maintaining the cathode current within the 1.0 mA to 100 mA operational window. Consider stability boundary conditions regarding load capacitance if used in feedback configurations.

Part Context

This device belongs to the TL431 family of programmable precision references manufactured by onsemi. It serves as a monolithic replacement for traditional Zener diodes in applications requiring higher accuracy and lower temperature drift. The Micro8 package offers a compact surface-mount solution suitable for space-constrained designs.

Replacement Considerations

TL431ACDR2G