LM4040BIM-8.2

Overview

The LM4040BIM-8.2 is a micropower shunt voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 8.2 V with an initial accuracy of ±0.2% at 25°C. The device operates within an industrial temperature range of -40°C to +125°C and features a maximum temperature coefficient of 70 ppm/°C. It is housed in a compact SOT-23-3 surface-mount package and supports a maximum shunt current of 15 mA.

Feature Summary

• Provides stable fixed output voltage across the industrial temperature range
• Ultra-low operating current suitable for power-constrained designs
• High precision with ±0.2% initial accuracy at 25°C
• Compact SOT-23-3 package designed for space-saving applications

Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring precise voltage references
• Handheld meters and test equipment
• Industrial process control loops

Procurement Notes

Verify the manufacturer status as National Semiconductor was acquired by Texas Instruments; confirm if the specific suffix indicates lead-free or RoHS compliance. Ensure the 8.2V output variant is available from authorized distributors, as it may be less common than standard voltages like 2.5V or 5.0V. Check for obsolescence notices or recommended alternates on official TI channels before finalizing procurement plans.

Selection Notes

Select this component when a fixed 8.2V reference is required in a small SOT-23 package. The ±0.2% accuracy class (B) offers higher precision than the standard C grade. Consider the 70 ppm/°C temperature coefficient for applications with moderate thermal variations. Ensure the supply voltage exceeds 8.2V plus the minimum dropout voltage to maintain regulation within the specified 15 mA shunt current limit.

Part Context

This part belongs to the LM4040 family of micropower shunt voltage references. The 'B' suffix denotes the ±0.2% accuracy grade, while 'M' indicates the SOT-23-3 package. The '8.2' specifies the nominal output voltage. This series is designed for low-power applications where size and stability are critical, serving as a benchmark for precision references in portable electronics.

Replacement Considerations

Check for direct equivalents such as the LM4040CIM3-8.2/NOPB for lower accuracy requirements or other manufacturers offering 8.2V shunt references in SOT-23 packages. Verify pinout compatibility and thermal performance characteristics before substitution.