1N4708

Overview

The Microchip Technology 1N4708 is a silicon unidirectional Zener voltage regulator diode designed for through-hole mounting in DO-35 or DO-204AA (DO-7) axial packages. It features a nominal Zener voltage of 22 V with a tolerance of ±5% and a maximum power dissipation of 500 mW. The device operates within a junction temperature range of -65°C to +175°C, ensuring reliability in demanding environments. Key electrical characteristics include a maximum reverse leakage current of 10 nA at 16.7 V and a forward voltage drop of 1.1 V at 200 mA.

Feature Summary

• Provides stable voltage regulation using a 22 V Zener reference with standard 5% tolerance.
• Engineered for high thermal stability with an extended operating temperature range up to 175°C.
• Utilizes low-leakage silicon construction to minimize standby power consumption.

Applications

• Voltage reference circuits requiring precise 22 V stabilization.
• Overvoltage protection stages in sensitive electronic systems.
• Clamping applications in signal processing paths.

Procurement Notes

Verify the specific package variant, as the 1N4708 designation appears across different manufacturers including Vishay and CDI-Diode with slight packaging distinctions like DO-35 versus DO-204AA. Confirm RoHS compliance status if required by your assembly process, as historical data indicates non-compliant options exist. Ensure the supplier provides official datasheets matching the exact suffix and manufacturer to guarantee parameter consistency.

Selection Notes

Select this component when a robust, through-hole Zener diode is needed for 22 V regulation. Consider the 500 mW power rating against expected circuit dissipation. Evaluate the ±5% tolerance against circuit precision requirements. Compare the axial leaded form factor against available surface-mount alternatives if board space is constrained.

Part Context

This part belongs to the widely recognized 1N47xx series of Zener diodes, a legacy standard maintained by multiple semiconductor vendors. Microchip Technology produces this component alongside other discrete semiconductors, focusing on industrial-grade reliability. The series offers a broad spectrum of voltage values, making it a common choice for general-purpose voltage regulation tasks.

Replacement Considerations

Equivalent parts from other manufacturers include the Vishay 1N4708 and CDI-Diode 1N4708. Verify that substitute components match the 22 V nominal voltage, 500 mW power rating, and axial package dimensions to ensure mechanical and electrical compatibility without circuit redesign.