LM431CIM3/NOPB

Voltage Reference Overview

The LM431CIM3/NOPB is an adjustable precision Zener shunt regulator manufactured by Texas Instruments. It operates within a voltage range of 2.495 V to 37 V and features an initial accuracy of 0.5%. The device supports a maximum shunt current of 100 mA with a temperature coefficient of 97 ppm/°C. Designed for surface mount applications, it utilizes a SOT-23-3 package. The component functions reliably across a minimum operating temperature of -40°C and a maximum operating temperature of +85°C.

Voltage Reference Feature Summary

• Adjustable reference output capability via external resistor network
• High accuracy performance with 0.5% initial tolerance
• Robust thermal stability defined by specified temperature coefficient

Voltage Reference Applications

• Precision voltage regulation in power supply circuits
• Reference voltage generation for analog-to-digital converters
• Comparator replacement in switching control loops

Voltage Reference Procurement Notes

Verify the specific suffix configuration against official Texas Instruments documentation to ensure compatibility with required packaging and environmental specifications. Confirm that the SOT-23-3 footprint matches the target PCB design constraints. Cross-reference the datasheet revision history to validate electrical parameters against the intended application requirements before finalizing procurement decisions.

Voltage Reference Selection Notes

Select this component when an adjustable shunt regulator is required in a compact surface-mount form factor. The 0.5% accuracy and wide input voltage range make it suitable for general-purpose precision applications. Ensure the thermal management strategy accommodates the specified operating temperature range and power dissipation limits inherent to the SOT-23-3 package.

Voltage Reference Part Context

This part belongs to the LM431 series of adjustable precision Zener diodes from Texas Instruments. It serves as a drop-in replacement for standard Zener diodes in many circuit designs while offering superior voltage adjustability and stability. The NOPB suffix indicates lead-free construction compliant with RoHS directives.

Voltage Reference Replacement Considerations

Direct substitutes include LM431AIM3X/NOPB and LM431BIM3/NOPB, which offer tighter initial accuracy tolerances. Verify pinout compatibility and thermal characteristics when transitioning between different accuracy grades within the same family.