LM385Z

Overview

The LM385Z is a micropower shunt voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It utilizes a bandgap design to provide stable voltage regulation across a wide operating current range from 10 µA to 20 mA. The device features low dynamic impedance and low noise, ensuring precise performance over time and temperature variations. Packaged in a standard TO-92 three-pin configuration, it offers initial accuracy options such as ±2% or ±1%. This component is designed for applications requiring extended battery life due to its minimal quiescent current consumption.

Feature Summary

• Bandgap voltage reference design providing stable regulation
• Wide operating current range supporting micropower applications
• Low dynamic impedance and low noise characteristics
• Precision voltage output with tight initial tolerance

Applications

• Portable instrumentation circuits
• Battery-powered measurement devices
• General-purpose analog circuit references
• Power management systems

Procurement Notes

Verify the specific manufacturer origin, as National Semiconductor assets are managed by Texas Instruments. Confirm the exact accuracy grade suffix (e.g., Z vs AZ) required for your precision needs. Ensure the TO-92 through-hole package matches your PCB layout. Check RoHS compliance status depending on the production batch and region. Validate that the operating temperature range meets your environmental specifications.

Selection Notes

Select this component when a fixed, low-cost voltage reference is needed for through-hole designs. Consider the maximum output current limit of 20 mA for load requirements. Evaluate the temperature coefficient if operation outside commercial ranges is necessary. Compare against adjustable alternatives like the LM385 if variable reference voltages are required. Ensure input voltage exceeds the reference voltage plus necessary headroom.

Part Context

The LM385 series represents a family of micropower voltage references known for reliability and low cost. The LM385Z specifically denotes the standard accuracy variant within this lineup. It serves as a fundamental building block for linear regulators and ADC reference inputs. The TO-92 package allows for easy prototyping and manual assembly. It remains a widely used solution for basic precision voltage generation tasks.

Replacement Considerations

LM385AZ-1.2: Offers tighter initial accuracy tolerance compared to the standard Z variant while maintaining the same package and nominal voltage.