1N4919

Overview

The Microchip Technology 1N4919 is a temperature-compensated Zener reference diode designed for precision voltage regulation applications. It features a nominal Zener voltage of 19.2 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 500 mW and exhibits a maximum dynamic impedance of 300 Ohms. It operates within an extended temperature range from -55°C to +100°C, ensuring stable performance in demanding environments.

Feature Summary

• Temperature compensated design for low noise and high stability
• Precision voltage reference capability with tight tolerance
• Robust construction suitable for industrial operating temperatures

Applications

• Precision voltage reference circuits
• Low noise power supply regulation
• Temperature compensated oscillator references

Procurement Notes

Verify the specific manufacturer source, as historical production has shifted between Microsemi and Microchip Technology. Confirm the package type matches the required footprint, typically DO-35 axial leaded. Ensure the datasheet version aligns with the intended application requirements regarding impedance and thermal characteristics before finalizing procurement.

Selection Notes

Select this component when a stable, low-noise voltage reference near 19V is required. The temperature compensation feature makes it superior to standard Zener diodes for applications where ambient temperature fluctuates significantly. Consider the 500 mW power rating to ensure adequate thermal headroom in the final circuit design.

Part Context

This component belongs to the family of low-noise, temperature-compensated Zener reference diodes. These devices are engineered to provide a highly stable reference voltage over a wide temperature range, distinguishing them from general-purpose Zener diodes used primarily for simple clamping or protection roles.

Replacement Considerations

Check for direct equivalents such as the 1N4916 through 1N4932A series variants if different voltage levels are acceptable. Verify pinout compatibility and package dimensions when substituting with components from other manufacturers to ensure mechanical fit.