onsemi LM385BZ-1.2

Summary of LM385BZ-1.2 Voltage Reference IC from onsemi

The LM385BZ-1.2 voltage reference IC from onsemi is a precision, two-terminal shunt voltage reference, specifically designed for applications demanding stable and accurate reference voltages in analog systems. Utilizing an integrated bandgap circuit, the LM385BZ-1.2 delivers a fixed 1.235 V output with an initial tolerance of ±1%. Packaged in the widely used TO-92 (TO-226) configuration, it addresses market needs for cost-effective, reliable voltage references that require minimal operating current, making it especially suitable for portable and battery-powered instrumentation.

Main Electrical Specifications and Performance Features of LM385BZ-1.2

The LM385BZ-1.2 is characterized by a micropower profile, operating efficiently within a current range of 10 µA to 20 mA. Its low dynamic impedance (typically 1.0 Ω) ensures stable operation even as load conditions or supply voltages fluctuate. A key feature is its low-noise performance, minimizing interference in sensitive analog circuits. The device offers tight voltage tolerances through precision on-chip trimming, maintaining accuracy across its operational range. The LM385BZ-1.2 is available in several tolerance grades, with the 1% variant providing enhanced confidence for use in demanding applications such as precision comparators, ADC references, and control loops.

Engineers can refer to typical performance curves that illustrate the LM385BZ-1.2’s reverse and forward characteristics, temperature drift, noise voltage, and response time. The demonstrated stability over both time and temperature means design teams can rely on consistent output without frequent recalibration or compensation, even in dynamic environments.

LM385BZ-1.2 Packaging Details and Mechanical Dimensions

The LM385BZ-1.2 is supplied in a TO-92 (TO-226) plastic package, providing convenience for hand and automated assembly in prototyping and scale manufacturing. The package is rated for up to 1 watt of power dissipation, suitable for low-power voltage reference functions. onsemi’s adherence to industry mechanical standards ensures dimensional consistency and straightforward integration into existing layouts.

For surface-mount applications, the LM385 series is also available in SOIC-8 NB packages, broadening mounting options for dense-board designs. When reviewing the mechanical drawings, engineers should account for lead width tolerances, mold flash, and proper footprint alignment during PCB design to guarantee optimum solder joint reliability.

LM385BZ-1.2 Operating Parameters and Environmental Specifications

The LM385BZ-1.2 is specified for operation over the 0°C to +70°C temperature range, positioning it for use in commercial environments. Maximum ratings must be observed to avoid device degradation or premature failure. onsemi details minimum and maximum ambient temperature constraints to assure reliable performance and guide thermal management strategies.

The LM385BZ-1.2 is produced as a Pb-free, RoHS-compliant device, supporting environmentally conscious production and deployment requirements. This compliance eases integration into new products and supports certification processes for global markets.

Use Cases and Design Recommendations for LM385BZ-1.2

Due to its extremely low operating current and stable voltage output, the LM385BZ-1.2 is ideal for use in portable instrumentation, micropower regulators, low-drift sensor circuits, and precision analog subsystems. Its robust regulation in supply-varying scenarios means designers can employ it in circuit architectures where battery voltage fluctuates, yet a stable reference is critical.

Key engineering considerations include selecting an operational tolerance grade matching the required system accuracy and confirming dynamic impedance aligns with load step response requirements. The TO-92 package permits easy integration in through-hole designs, while its surface-mount equivalent can streamline modern compact PCB layouts. For battery-powered equipment, the LM385BZ-1.2’s micropower nature helps maximize battery life, offering direct benefit in handheld medical, industrial, and consumer devices.

Alternative and Substitute Devices for LM385BZ-1.2

When evaluating drop-in equivalents or seeking alternatives for lifecycle management, engineers may consider other models within the LM285/LM385 series from onsemi, such as LM385B-1.2 for similar electrical characteristics but different packaging or tolerance grades. Additionally, the higher-voltage LM385BZ-2.5 offers a 2.500 V output option for reference requirements above 1.235 V.

Selection of a suitable alternative requires matching the reference voltage, tolerance grade, package style, and operating current range to the needs of the end application. The LM285 series, rated for wider temperature ranges, becomes pertinent for industrial or extended temperature deployments. Careful examination of electrical and mechanical data sheets should guide component substitution to maintain system reliability and accuracy.

Conclusion

The LM385BZ-1.2 voltage reference IC by onsemi serves as a dependable solution for engineers needing precise, low-power voltage references in analog electronic systems. Its combination of tight output stability, low current consumption, industry-standard packaging, and environmental compliance positions it as a standout choice for both new and legacy designs. By comparing key features against possible equivalents and verifying compatibility with specific application requirements, engineers and procurement professionals can confidently integrate the LM385BZ-1.2 into precision analog designs.