LM285Z

Overview

The LM285Z is an adjustable micropower shunt voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It operates within a temperature range of -40°C to +85°C and utilizes a TO-92 through-hole package. The device provides an output voltage range from 1.24 V to 5.3 V with an initial accuracy of 2% and a temperature coefficient of 150 PPM/°C. Maximum shunt current is rated at 20 mA, while minimum operating current is 10 µA.

Feature Summary

• Adjustable output voltage capability via external resistor network
• Micropower operation suitable for battery-powered applications
• Shunt regulation topology for stable reference performance

Applications

• Precision analog-to-digital converter references
• Battery monitoring circuits
• Comparator threshold setting

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the specific suffix matches the required tolerance and package variant. Confirm RoHS compliance status for the specific production batch. Check for any obsolescence notices or lifecycle changes associated with legacy National Semiconductor part numbers before finalizing procurement plans.

Selection Notes

Select this component when an adjustable low-cost voltage reference is required in a TO-92 package. Consider the 150 PPM/°C temperature coefficient for thermal stability requirements. Evaluate the 20 mA maximum shunt current against load demands. Compare against fixed-reference alternatives if precise voltage levels are needed without external components.

Part Context

The LM285 series belongs to the family of two-terminal zener-based voltage references. It serves as an adjustable counterpart to fixed-voltage variants like the LM285-2.5. The Z suffix typically denotes the plastic TO-92 package style common in through-hole designs. This component falls under power management integrated circuits specifically categorized as voltage references.

Replacement Considerations

LM285BXZ/NOPB: Verified equivalent from Texas Instruments with identical electrical characteristics and TO-92 packaging.