NCP431AIDR2G

Overview

The NCP431AIDR2G is a three-terminal programmable shunt regulator diode from onsemi, operating within a cathode-to-anode voltage range of Vref to 36 V. It features a typical reference input voltage tolerance of ±1% at 25°C and an equivalent full-range temperature coefficient of 50 ppm/°C. The device supports a continuous cathode current range of 40 µA to 100 mA with a typical dynamic impedance of 0.22 Ω. Designed for industrial applications, it operates over an ambient temperature range of -40°C to +85°C and is housed in a lead-free SOIC-8 package.

Feature Summary

• Programmable output voltage adjustable from the internal reference up to 36 V using external resistors
• Low minimum operating current enabling efficient secondary regulation in switching power supplies
• Temperature compensated operation across the full rated industrial temperature range
• Lead-free construction compliant with environmental standards

Applications

• Voltage adapters
• Switching power supply feedback loops
• Precision voltage references
• Battery chargers
• Instrumentation circuits

Procurement Notes

Verify the specific suffix 'I' confirms the -40°C to +85°C industrial temperature rating. Confirm the 'DR2G' designation corresponds to the SOIC-8 surface mount package and tape & reel shipping format. Ensure the component is sourced as a Pb-Free device consistent with the ordering information provided in the datasheet.

Selection Notes

Select this component when an industrial-grade temperature range is required alongside low standby current consumption. The NCP431A variant provides a standard 1% initial accuracy suitable for general precision applications. Consider the SOIC-8 package for automated surface mount assembly processes where space efficiency is prioritized.

Part Context

This part belongs to the NCP431/NCP432 series of programmable precision references manufactured by onsemi. It serves as a monolithic IC voltage reference that replaces traditional Zener diodes in various analog and digital circuits. The series includes variants with different accuracy grades and temperature ranges to suit diverse design requirements.

Replacement Considerations

NCP431ACDR2G

FAQ

What is the minimum cathode current required for stable regulation?

The minimum cathode current for regulation is typically 40 µA at 25°C, ensuring stable operation even at very low bias currents.

How does the NCP431A differ from the NCP431B in terms of accuracy?

The NCP431A has a typical reference voltage tolerance of ±1%, whereas the NCP431B offers a tighter typical tolerance of ±0.5%.