LM385BDRG4-1-2

Overview

The LM385BDRG4-1-2 is a micropower shunt voltage reference IC manufactured by Texas Instruments. It provides a fixed output voltage of 1.235 V with an initial accuracy tolerance of ±1%. The device operates within a temperature range of 0°C to +70°C and features a low temperature coefficient of 20 ppm/°C. It supports a maximum shunt current of 20 mA and draws a cathode current of 15 µA. The component is housed in an 8-SOIC package (0.154 inch width) and exhibits a noise level of 60 µVrms between 10 Hz and 10 kHz.

Feature Summary

• Provides a stable 1.235 V reference voltage suitable for precision applications
• Features high initial accuracy with ±1% tolerance
• Operates with low power consumption via 15 µA cathode current
• Designed for surface-mount integration in compact circuits

Applications

• Precision analog-to-digital converter (ADC) reference sources
• Data acquisition systems requiring stable voltage baselines
• Battery-powered instrumentation circuits
• Portable measurement devices

Procurement Notes

Verify the specific suffix 'RG4' indicates RoHS compliance and manufacturing origin details as per Texas Instruments documentation. Confirm the 8-SOIC package dimensions match your PCB footprint requirements. Check for end-of-life notices or product change notifications, as this part number has been marked as obsolete in some distributor records. Ensure the operating temperature range of 0°C to +70°C meets your environmental specifications.

Selection Notes

Select this component when a low-cost, fixed 1.235 V reference is required with moderate accuracy. It is appropriate for designs where space is limited due to the SOIC-8 package. Consider the 20 ppm/°C temperature coefficient for thermal stability needs. Compare against the LM385M/NOPB if adjustable voltage references are needed instead of a fixed output.

Part Context

This device belongs to the LM385 family of micropower shunt voltage references from Texas Instruments. It serves as a cost-effective alternative to higher-precision zener diodes. The LM385 series is widely used in industrial and consumer electronics for providing reliable reference voltages in signal conditioning chains.

Replacement Considerations

Publicly confirmed substitute part numbers include LM385BDE4-1-2 and LM385BD-1-2. Verify pinout compatibility and package dimensions before substitution.