IRU431ALCS

Overview

The IRU431ALCS is a three-terminal adjustable shunt regulator and precision voltage reference housed in an 8-pin plastic SOIC package. It features a 0.5% initial accuracy for the internal voltage reference, which operates at 1.24V. The device supports an adjustable output voltage range from 1.24V to 6V using external resistors. It requires a minimum cathode current of 80μA to regulate and remains unconditionally stable with only a 1μF capacitor connected between the cathode and anode pins.

Feature Summary

• Provides a precise 1.24V internal voltage reference with 0.5% initial accuracy
• Enables adjustable output voltage setting via external resistor divider network
• Maintains unconditional stability with a minimal 1μF cathode-to-anode capacitor
• Operates with low quiescent current requirements suitable for battery applications

Applications

• Precision Voltage Reference
• Linear Regulator Controller
• Secondary Side Controller for Low Voltage Power Supply Applications

Procurement Notes

Verify that the component matches the specific IRU431AL variant requiring 0.5% reference accuracy rather than the standard IRU431L. Confirm the package designation corresponds to the 8-pin plastic SOIC format indicated by the suffix. Ensure the operating temperature range aligns with the specified 0°C to 70°C commercial grade limits for your application environment.

Selection Notes

Select this component when a high-accuracy voltage reference is required alongside shunt regulation capabilities. The 0.5% tolerance makes it suitable for applications demanding tight voltage control. Consider the 8-pin SOIC package if higher power dissipation capability compared to SOT-23 packages is necessary for thermal management in the design.

Part Context

This device belongs to the IRU431L family of low-voltage adjustable precision shunt regulators. It serves as a cost-effective alternative to traditional Zener diodes, offering superior dynamic impedance and temperature stability. The part is designed to function effectively as both a standalone voltage reference and an active element in feedback loops for linear regulators.

Replacement Considerations

Pin-to-pin compatible with TLV431.