LM385M3-1.2

Overview

The LM385M3X-1.2 is a micropower shunt voltage reference diode manufactured by Texas Instruments, housed in a compact SOT-23 surface-mount package with three pins. It provides a nominal output voltage of 1.235V with an initial accuracy of ±2%. The device operates within a temperature range of 0°C to +70°C and features a maximum temperature coefficient of 150ppm/°C. It supports a maximum cathode current of 20mA and requires a minimum operating current of 10μA. The component exhibits a noise level of 60µVrms and measures 2.90 x 1.30mm with a height of 1.12mm.

Feature Summary

• Provides stable 1.235V reference voltage using bipolar bandgap technology
• Operates efficiently within a wide dynamic current range from 10μA to 20mA
• Designed for low power consumption suitable for battery-powered applications

Applications

• Battery-operated portable instruments
• General-purpose analog circuits requiring precise voltage references
• Microprocessor system supervisory circuits

Procurement Notes

Verify the specific suffix 'M3X' against official Texas Instruments documentation to confirm the exact tape-and-reel packaging configuration and pinout orientation. Ensure the selected variant matches the required commercial temperature range and accuracy class for your design specifications before finalizing procurement orders.

Selection Notes

Select this component when a fixed 1.2V reference is needed in a small SOT-23 footprint. It serves as a direct replacement for legacy LM385-1.2 devices in space-constrained designs. Consider the ±2% tolerance and 150ppm/°C drift characteristics against stricter precision requirements that might necessitate higher-grade variants like the LM385B series.

Part Context

This part belongs to the LM385 family of micropower voltage references, which includes adjustable and fixed versions at 1.2V and 2.5V. The M3X designation indicates a specific surface-mount package variant optimized for automated assembly processes, maintaining compatibility with the standard electrical performance of the broader LM385 series.

Replacement Considerations

LM385M-1.2/NOPB is a documented equivalent offering similar electrical characteristics in an SOIC-8 package.