NCV431AIDR2

Overview

The NCV431AIDR2 is a three-terminal programmable shunt regulator diode from onsemi, designed for precision voltage reference applications. It operates within a cathode-to-anode voltage range of Vref to 36 V and supports a continuous sink current from 1.0 mA to 100 mA. The device features an internal 2.5 V reference with a typical initial accuracy of 1% at 25°C and a temperature coefficient of 50 ppm/°C. Packaged in SOIC-8 (D suffix), it is qualified under AEC-Q100 standards for automotive use, ensuring reliability across an operating temperature range of -40°C to +125°C.

Feature Summary

• Programmable output voltage adjustable from the internal reference level up to 36 V using external resistors
• Automotive-grade qualification compliant with AEC-Q100 standards for enhanced reliability
• Low dynamic output impedance typically 0.22 ohms for stable regulation
• Temperature compensated operation across the full industrial and automotive range

Applications

• Feedback control circuits driving optocouplers in power supplies
• Digital voltmeters requiring stable reference voltages
• Op amp circuitry needing precise biasing or scaling
• Voltage monitor systems with defined trip points

Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape/reel specifications for automated assembly processes. Confirm that the component meets the AEC-Q100 qualification requirements if the target application involves automotive electronics. Ensure the selected variant aligns with the necessary operating temperature range and tolerance levels specified by the design constraints.

Selection Notes

Select this component when a precision shunt regulator with automotive qualification is required. The NCV prefix indicates site and change control suitable for high-reliability environments. Consider the thermal resistance characteristics of the SOIC-8 package when designing for high-power dissipation scenarios. Verify stability boundary conditions regarding load capacitance and cathode current to ensure loop stability in feedback configurations.

Part Context

This part belongs to the TL431 family of programmable precision references manufactured by onsemi. The NCV prefix specifically denotes devices intended for automotive and other applications requiring strict site and change control protocols. It serves as a direct replacement for standard zener diodes in many precision applications, offering superior temperature compensation and lower dynamic impedance compared to discrete solutions.

Replacement Considerations

• TL431AIDR2G

FAQ

What is the maximum cathode-to-anode voltage rating?

The maximum cathode-to-anode voltage rating is 37 V.

Does this device require external components for basic operation?

Yes, two external resistors are required to program the output voltage from the internal reference level up to 36 V.