LM431ACM3/NOPB

Voltage Reference Overview

The LM431ACM3/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 ±2%. The device supports a maximum shunt current of 100 mA with a temperature coefficient of 97 ppm/°C. Designed for surface-mount installation, it utilizes a SOT-23-3 package. The component functions reliably across an operating temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides adjustable reference voltage functionality via external resistor network
• Delivers high stability with low temperature coefficient characteristics
• Supports wide input voltage operation up to 37 V

Voltage Reference Applications

• Precision voltage regulation in power supply circuits
• Programmable linear regulators
• Voltage monitoring and protection systems

Voltage Reference Procurement Notes

Verify the specific suffix 'A' indicates the ±2% accuracy grade distinct from other variants. Confirm the 'CM3' designation corresponds to the SOT-23-3 surface-mount package configuration. Ensure the 'NOPB' suffix confirms lead-free and RoHS compliance status as per manufacturer specifications before finalizing procurement orders.

Voltage Reference Selection Notes

Select this component when a compact surface-mount solution is required for adjustable shunt regulation. The ±2% accuracy suits general-purpose applications where tighter tolerances are unnecessary. Consider the 100 mA current capability for load requirements and verify the SOT-23-3 footprint compatibility with existing PCB layouts during the design phase.

Voltage Reference Part Context

This part belongs to the LM431 family of adjustable shunt regulators, widely used for voltage referencing. It serves as a cost-effective alternative to fixed Zener diodes by allowing precise voltage setting through external resistors. The device integrates a bandgap reference and error amplifier to maintain stable output under varying load conditions.

Voltage Reference Replacement Considerations

Direct substitutes include LM431AIM3X/NOPB and LM431CIM3/NOPB, which offer different accuracy grades. Verify package compatibility and electrical parameter alignment when transitioning between these variants to ensure circuit performance consistency.