1N4919A

Overview

The 1N4919A is a temperature-compensated Zener reference diode manufactured by Microchip Technology. It features a nominal Zener voltage of 19.2 V with a maximum impedance of 72 ohms at test currents ranging from 0.005 A to 300 mA. The device operates within a junction temperature range of +25°C to +100°C and dissipates up to 0.5 W. It utilizes the DO-35 axial leaded package, ensuring stable voltage regulation for precision applications requiring low noise performance.

Feature Summary

• Temperature compensated design for stable voltage regulation across operating ranges
• Low noise characteristics suitable for precision reference applications
• Axial leaded DO-35 package for through-hole mounting

Applications

• Precision voltage reference circuits
• Temperature compensated regulator designs
• Low noise analog signal conditioning

Procurement Notes

Verify the manufacturer origin, as the component was originally developed by Microsemi Corporation before its acquisition by Microchip Technology. Confirm that the specific order suffix matches the required tolerance and packaging specifications. Ensure compliance with current RoHS directives if applicable to the procurement region. Cross-reference datasheet revisions to confirm electrical parameter consistency.

Selection Notes

Select this component when a stable 19.2 V reference is required with minimal temperature drift. The low impedance characteristic supports higher current loads compared to standard Zener diodes. Consider the DO-35 package constraints for PCB layout. Evaluate thermal management requirements given the 0.5 W power dissipation limit in enclosed environments.

Part Context

This component belongs to the 1N4916 through 1N4932A series of temperature-compensated Zener reference diodes. These devices are engineered to provide superior voltage stability over temperature variations compared to conventional Zener diodes. The series is widely used in instrumentation and measurement equipment where reference accuracy is critical.

Replacement Considerations

Direct substitutes include other 19.2 V temperature-compensated Zener diodes in the DO-35 package from qualified manufacturers. Verify pinout compatibility and thermal resistance values. Ensure replacement parts meet the same impedance and noise specifications.