LM4040C50QDBZT

Overview

The LM4040C50QDBZT is a precision micropower shunt voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 5V with an initial accuracy tolerance of ±0.5%. The device operates within an extended temperature range from -40°C to +125°C and features a maximum average temperature coefficient of 100ppm/°C. It requires a minimum cathode current of 45μA (typical) and supports a maximum continuous cathode current of 15mA. The component is housed in a space-saving SOT-23-3 surface-mount package.

Feature Summary

• Provides stable reference voltage without requiring external output capacitors due to stability with all capacitive loads
• Maintains low dynamic impedance and low noise characteristics across wide operating currents and temperatures
• Utilizes fuse and Zener-zap reverse breakdown voltage trim during wafer sort for tight output tolerances

Applications

• Data-Acquisition Systems
• Energy Infrastructure
• Analog Input Modules
• Field Transmitters
• Precision Audio

Procurement Notes

Verify the specific suffix 'Q' indicates the extended temperature range (-40°C to 125°C) and 'DBZ' denotes the SOT-23-3 package. Confirm the 'C' grade corresponds to the required 0.5% initial accuracy and 100ppm/°C temperature coefficient specifications. Ensure compatibility with the intended PCB footprint for the three-pin SOT-23 form factor before finalizing procurement orders.

Selection Notes

Select this component when a 5V reference is needed in high-temperature environments up to 125°C. The C-grade offers a balance of cost and performance with 0.5% accuracy. Consider the SOT-23-3 package for space-constrained designs. Verify that the application current stays within the 45μA to 15mA operating range to ensure optimal regulation and noise performance.

Part Context

This part belongs to the LM4040 series of micropower shunt voltage references. The series includes various grades (A, B, C, D) offering different accuracy levels and temperature coefficients. The 'Q' suffix specifically designates the extended industrial temperature variant, distinguishing it from the standard 'I' grade which operates up to 85°C. All variants share similar electrical characteristics but differ in thermal endurance and tolerance specifications.

Replacement Considerations

LM4040C50IDBZT: Identical electrical specifications but limited to the industrial temperature range (-40°C to 85°C).

FAQ

Does the LM4040C50QDBZT require an output capacitor for stability?

No, the device is stable with all capacitive loads and does not require an external output capacitor for operation.

What is the difference between the Q and I suffixes in this part number?

The 'Q' suffix indicates the device is characterized for an extended temperature range of -40°C to 125°C, whereas the 'I' suffix indicates an industrial range of -40°C to 85°C.