LM285Z-1.2#PBF

Overview

The LM285Z-1.2#PBF is a micropower shunt voltage reference diode manufactured by Analog Devices Inc., operating within a temperature range of -40°C to +85°C. It provides a nominal reverse breakdown voltage of 1.235V with a guaranteed initial tolerance of ±1%. The device functions effectively in a current range from 10µA to 20mA, featuring a maximum dynamic impedance of 1Ω and low noise characteristics. Packaged in a 3-lead plastic TO-92 (Z package), it offers excellent long-term stability and low power consumption suitable for precision applications.

Feature Summary

• Guaranteed 1% initial voltage tolerance at 25°C
• Micropower operation with minimum current as low as 10µA
• Low dynamic impedance of 1Ω maximum
• Excellent long-term stability over time and temperature

Applications

• Portable meter references
• Battery operated systems
• Current loop instrumentation
• Portable test instruments

Procurement Notes

Verify the specific manufacturer designation on the datasheet, as the LM285 series was originally developed by Linear Technology Corporation before its acquisition by Analog Devices Inc. Confirm that the Z package corresponds to the 3-lead plastic TO-92 form factor required for your design. Ensure the component meets the specified -40°C to +85°C operating temperature range for your application environment.

Selection Notes

Select this component when a stable 1.235V reference is needed with tight initial accuracy requirements. It is suitable for designs requiring low quiescent current operation down to 10µA. Consider the TO-92 package constraints if space is limited. Verify thermal dissipation capabilities within the specified operating temperature range for your specific circuit layout.

Part Context

This part belongs to the LM185/LM285/LM385 family of micropower voltage reference diodes. The 'LM285' designation indicates an industrial temperature grade (-40°C to +85°C), distinguishing it from the military-grade LM185 and commercial-grade LM385 variants. The 'Z' suffix specifies the 3-lead plastic TO-92 package style.

Replacement Considerations

The LM385Z-1.2 serves as a lower-cost alternative with a commercial temperature range (0°C to 70°C). For wider temperature ranges, the LM185Z-1.2 covers -55°C to 125°C. The LT1004-1.2 offers higher initial accuracy but may have different power characteristics.

FAQ

What is the minimum operating current for the LM285Z-1.2?

The device is designed to operate with currents as low as 10µA while maintaining guaranteed specifications.

What is the typical noise performance of this reference?

The wideband noise is typically 60µVrms measured between 10Hz and 10kHz at a reverse current of 100µA.