LM385BZ-2.5RAG

Overview

The LM385BZ-2.5RAG is a micropower two-terminal bandgap voltage reference diode manufactured by onsemi, belonging to the LM385 series. It provides a fixed reference voltage of 2.5 V with an initial precision of ±1.5%. The device utilizes a shunt topology and is housed in an 8-pin SOIC surface-mount package. It operates within a temperature range of -40°C to 85°C, featuring a typical temperature coefficient of 80 ppm/°C. The component supports an output current up to 20 mA and maintains low dynamic impedance for stable regulation across varying supply conditions.

Feature Summary

• Micropower two-terminal bandgap design enabling operation over a wide current range from 20 µA to 20 mA
• Tight voltage tolerance achieved through on-chip trimming for high initial accuracy
• Low dynamic impedance ensures stable performance under varying load conditions
• Capacitive load tolerant architecture simplifies integration into analog circuits

Applications

• Portable instrumentation requiring extended battery life
• Battery-powered regulators and power management circuits
• General-purpose analog circuitry needing precise voltage references
• Current loop instruments and panel meters

Procurement Notes

Verify the specific suffix 'RA' against the official onsemi datasheet to confirm tape-and-reel packaging specifications and lot traceability requirements. Ensure the procurement documentation explicitly states the ±1.5% initial tolerance class corresponding to the 'B' designation. Cross-reference the SOIC-8 footprint dimensions with the manufacturer's mechanical drawing to guarantee compatibility with existing PCB layouts.

Selection Notes

Select this component when a fixed 2.5 V reference is required in a surface-mount form factor with tight initial accuracy. The LM385BZ variant offers superior precision compared to standard LM385 models. Consider the operating temperature range and maximum input voltage limits relative to the system supply. The wide dynamic current range allows flexibility in biasing resistor selection for various power consumption targets.

Part Context

This part belongs to the LMx85 family of micropower voltage reference diodes, which includes variants like LM285 and LM385. These devices are designed as drop-in replacements for older zener-based references, offering significantly lower noise and better temperature stability. The family is characterized by its simplicity, requiring only a single current-limiting resistor to function effectively in most applications.

Replacement Considerations

LM385BZ-2.5 (Standard Tape & Reel)

FAQ

What is the minimum operating current required for the LM385BZ-2.5RAG?

The device requires a minimum operating current of 20 µA to maintain proper regulation and voltage stability.

How does the LM385BZ handle capacitive loads?

The internal design provides special tolerance to capacitive loads, allowing it to drive capacitance without oscillation in most reference applications.