1N4709

Overview

The Microchip Technology 1N4709 is a 500 mW axial-leaded Zener voltage regulator diode housed in a hermetically sealed glass DO-7 (DO-204AA) package. It provides a nominal Zener voltage of 24 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features an internal metallurgical bond. Key electrical parameters include a maximum reverse leakage current of 0.01 µA at the rated voltage, a test current of 50 µA, and a maximum DC Zener current of 19.8 mA.

Feature Summary

• Hermetically sealed glass construction with internal metallurgical bonding for durability
• Capable of regulating voltage across a broad operating current and temperature range
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

• Voltage regulation in military and aerospace circuits
• Reference voltage sources requiring high stability
• Power supply protection against over-voltage conditions

Procurement Notes

Verify the manufacturer origin, as this component is produced by multiple vendors including Microsemi and Microchip Technology. Confirm that the specific part number matches the required JEDEC registration and package style. Ensure compliance with any specific screening requirements such as MIL-PRF-19500 if applicable to your design.

Selection Notes

Select this component when a 24 V reference is needed in a through-hole axial configuration. Consider the 500 mW power dissipation limit and the thermal resistance characteristics for proper heat management. Verify that the low leakage current and tight voltage tolerance meet the precision requirements of the target application.

Part Context

This component belongs to the 1N4678 through 1N4717 series of 0.5 W Zener regulators. These devices are widely used in general-purpose electronics and specialized industrial applications where reliable voltage clamping is essential. The series offers a comprehensive selection of voltages from 1.8 V to 43 V.

Replacement Considerations

Equivalent parts include other manufacturers' 1N4709 variants meeting the same JEDEC specifications. Cross-referencing should focus on matching the 24 V nominal voltage, 500 mW power rating, and DO-7 package dimensions.