1N4917

Overview

The Microchip Technology 1N4917 is a temperature compensated Zener reference diode with a nominal voltage of 19.2 V and ±5% tolerance. It features low noise characteristics and metallurgically bonded construction within a DO-35 (DO-204AH) axial through-hole package. The device operates at a maximum power dissipation of 500 mW, with a test current of 26 mA and a maximum reverse leakage current of 1 µA. It supports an operating temperature range from -65 °C to +175 °C.

Feature Summary

• Temperature compensated design for stable voltage reference across wide thermal ranges
• Low noise performance suitable for precision analog circuits
• Metallurgically bonded double plug construction for enhanced reliability

Applications

• Precision voltage reference sources in measurement equipment
• Voltage regulation in sensitive analog signal processing circuits
• Overvoltage protection clamping in instrumentation systems

Procurement Notes

Verify the specific manufacturer source, as the 1N4917 designation has been produced by multiple entities including Microsemi and Microchip. Confirm that the received component matches the required DO-35 package and 19.2 V specification. Check datasheets for exact electrical limits regarding leakage and impedance to ensure compatibility with high-precision application requirements.

Selection Notes

Select this component when a stable, low-noise voltage reference is required over a wide temperature range. The 19.2 V nominal value and ±5% tolerance suit applications needing precise regulation without active feedback loops. Ensure the circuit can handle the 500 mW power dissipation and axial mounting constraints of the DO-35 package.

Part Context

The 1N4917 belongs to the family of temperature-compensated Zener diodes, distinct from standard Zener regulators. These devices utilize bandgap compensation techniques to minimize voltage drift with temperature changes. This makes them superior to standard Zener diodes for reference applications where stability is critical, such as in ADC/DAC references or precision power supplies.

Replacement Considerations

The 1N4917/TR is a variant of the same device offered by Microchip Technology. Verify package compatibility and electrical specifications before substituting with other manufacturers' equivalents, as tolerance and noise levels may vary.