LM385M3X-2.5

Overview

The LM385M3X-2.5 is a micropower shunt voltage reference diode manufactured by Texas Instruments, providing a fixed nominal output of 2.5V with an initial accuracy tolerance of ±3%. It operates within a temperature range of 0°C to 70°C and features a temperature coefficient of 150ppm/°C. The device supports a maximum cathode current of 20mA and requires a minimum operating current of 20µA. Noise performance is specified at 120µVrms over the 10Hz to 10kHz frequency band. It is housed in a surface-mount SOT-23 package.

Feature Summary

• Provides stable micropower voltage reference functionality suitable for low-power applications
• Utilizes shunt topology for precise voltage regulation without external feedback loops
• Designed for surface-mount integration using compact SOT-23 packaging

Applications

• Portable battery-powered instrumentation circuits
• Data acquisition systems requiring stable reference voltages
• Microcontroller analog-to-digital converter (ADC) references

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as legacy variants may differ from current NOPB designations. Ensure proper ESD handling procedures during storage and assembly. Validate package marking against official datasheet specifications to prevent counterfeit substitution.

Selection Notes

Select this component when a fixed 2.5V reference is required in space-constrained designs. The SOT-23 form factor offers a smaller footprint compared to traditional SOIC or TO-92 packages. Consider the 150ppm/°C temperature coefficient for thermal stability requirements. Verify that the 20µA minimum current draw aligns with system power budget constraints.

Part Context

This part belongs to the LM385 family of micropower voltage reference diodes, which includes industrial (LM185), commercial (LM285), and extended temperature (LM385) grades. The 'M3' suffix indicates the specific SOT-23-3 package variant. The 'X' denotes tape-and-reel packaging configuration. This series serves as a cost-effective solution for general-purpose voltage referencing tasks.

Replacement Considerations

The LM385M3X-2.5/NOPB is the confirmed lead-free and RoHS-compliant replacement for this component. Both parts share identical electrical characteristics and pinout configurations. Verify that the NOPB designation meets environmental compliance requirements for the target application.