LM431ACM3X/NOPB

Voltage Reference Overview

The LM431ACM3X/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 with a maximum input voltage of 37 V. The device features an initial accuracy of 2% and a temperature coefficient of 97 ppm/°C. It supports a maximum shunt current of 100 mA and functions across a temperature range from -40°C to +85°C. The component is housed in a surface-mount SOT-23-3 package.

Voltage Reference Feature Summary

• Provides adjustable precision voltage reference functionality via a two-terminal shunt regulation architecture.
• Delivers stable reference performance with specified initial accuracy and low temperature drift characteristics.

Voltage Reference Applications

• Precision voltage references in power supply circuits
• Programmable linear regulators
• Battery-operated equipment requiring accurate monitoring

Voltage Reference Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free and RoHS compliance status as per the manufacturer's latest documentation. Confirm the 'X' suffix indicates tape-and-reel packaging for the SOT-23-3 form factor. Ensure the 'A' grade designation matches the required 2% initial accuracy specification for the target application design.

Voltage Reference Selection Notes

Select this component when a surface-mount adjustable shunt regulator is required with 2% initial accuracy. The SOT-23-3 package suits space-constrained designs. Verify that the 100 mA maximum shunt current meets the load requirements. Consider the 97 ppm/°C temperature coefficient if thermal stability is critical for the reference voltage.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable precision Zener shunt regulators from Texas Instruments. It serves as a drop-in replacement for legacy National Semiconductor versions, maintaining functional compatibility while adhering to modern environmental standards indicated by the NOPB suffix.

Voltage Reference Replacement Considerations

LM431ACM3X (Non-NOPB version may differ in environmental compliance). LM431ACM/NOPB (SOIC-8 package variant). LM431AIM3X/NOPB (1% accuracy variant).