LM4040CIM3-4.1

Overview

The LM4040CIM3-4.1 is a micropower shunt voltage reference manufactured by Texas Instruments, formerly National Semiconductor. It provides a fixed reference voltage of 4.1 V with an initial accuracy of ±0.5%. The device operates within a temperature range of -40°C to +85°C and features a maximum temperature coefficient of 100 ppm/°C. It utilizes a SOT-23 surface-mount package with three pins. Key electrical parameters include a maximum cathode current of 15 mA, a minimum operating voltage of 4.1 V, and a maximum input voltage of 5 V. The unit weight is approximately 8 mg.

Feature Summary

• Provides stable reference voltage over the industrial temperature range
• Ultra-low operating current suitable for power-restricted designs
• High precision at 25°C with ±0.5% initial accuracy
• Stable operation when used with capacitive loads

Applications

• Portable instrumentation
• Battery-powered systems
• Data acquisition systems
• Process control loops

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific suffix matches the required tolerance and temperature grade. Confirm package type and lead finish compatibility with assembly processes. Check for RoHS compliance status if environmental regulations apply to the end product.

Selection Notes

Select this component when a fixed 4.1 V reference is required in space-constrained applications. The SOT-23 package offers a compact footprint compared to larger through-hole options. Consider the 100 ppm/°C temperature coefficient for environments with significant thermal variations. Ensure the supply voltage exceeds the minimum operating threshold while staying within the maximum input limit.

Part Context

This part belongs to the LM4040 series of micropower shunt voltage references. The series includes various output voltages and accuracy grades, such as 0.1%, 0.2%, and 1% variants. The LM4040 family is designed for applications requiring high stability and low power consumption. The CIM3 suffix indicates the commercial temperature range and SOT-23 package configuration.

Replacement Considerations

LM4040CIM3-4.1/NOPB is a direct equivalent with updated manufacturing codes. LM4040BIM3-4.1 offers higher precision (0.2%) but may have different thermal characteristics. LM4040DIM3-4.1 provides 1% accuracy for cost-sensitive applications. Verify pinout compatibility before substituting with other shunt reference devices.