LM4040C25FTA

Overview

The LM4040C25FTA is a precision micropower shunt voltage reference manufactured by Diodes Incorporated. It provides a fixed output voltage of 2.5V with an initial tolerance of ±0.5% at +25°C. The device operates within a wide current range from 60µA to 15mA and maintains stability over an extended temperature range of -40°C to +125°C. It features a maximum temperature coefficient of 100 ppm/°C and low noise characteristics, typically 35µVRMS in the 10Hz to 10kHz bandwidth. Packaged in a compact SOT-23-3 surface-mount format, it is designed for space-constrained applications.

Feature Summary

• Provides stable 2.5V reference voltage with ±0.5% initial accuracy
• Operates efficiently across a wide current range from 60µA to 15mA
• Maintains performance over an extended industrial temperature range
• Designed for high stability with capacitive loads without external components

Applications

• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Data acquisition systems

Procurement Notes

Verify that the component matches the specific C-grade tolerance requirement of ±0.5%. Confirm the SOT-23-3 package type aligns with PCB layout constraints. Ensure the operating environment stays within the specified -40°C to +125°C range. Check datasheet notes regarding pin connections, specifically that Pin 3 must be left floating or connected to Pin 2. Validate compliance with RoHS and lead-free standards if required by the assembly process.

Selection Notes

Select this part when a fixed 2.5V reference is needed with moderate precision. The C-grade offers a balance between cost and accuracy compared to B-grade options. Consider the low operating current for battery life extension. Verify that the thermal management capabilities of the SOT-23 package are sufficient for the expected power dissipation in the target application.

Part Context

This component belongs to the LM4040 family of bandgap circuits designed for precision voltage referencing. The 'C' suffix indicates the ±0.5% tolerance grade, while '25' specifies the 2.5V output. The 'FTA' suffix denotes the SOT-23 package and tape-and-reel packaging format. It serves as a micro-power alternative to larger reference packages.

Replacement Considerations

LM4040B25FTA (offers tighter ±0.2% tolerance)

FAQ

How should Pin 3 be handled in the SOT-23 package?

Pin 3 must be left floating or connected directly to Pin 2 due to the internal die attachment structure.

What is the typical noise performance of this device?

The typical noise voltage is 35µVRMS measured within the 10Hz to 10kHz frequency range.