1N4702

Overview

The Microchip Technology 1N4702 is a silicon unidirectional Zener voltage regulator diode designed for through-hole mounting. It features a DO-35 (DO-204AH) axial lead package with hermetically sealed glass construction. The device provides a nominal Zener voltage of 15 V and supports a maximum DC power dissipation of 500 mW at +50°C. It operates within an extended temperature range from -65°C to +175°C, ensuring stability in demanding environments.

Feature Summary

• Hermetically sealed glass construction protects the junction against common environmental conditions.
• Double slug type metallurgically bonded construction ensures high reliability and structural integrity.
• Extended operating temperature range suitable for harsh industrial applications.

Applications

• Voltage regulation in precision electronic circuits
• Temperature compensated reference diodes
• Overvoltage protection in sensitive semiconductor devices

Procurement Notes

Verify the specific manufacturer suffix or revision code on the component marking, as variations exist between Microchip, ON Semiconductor, and other legacy producers. Confirm RoHS compliance status if required by your assembly process, noting that some hermetic variants may not be compliant. Ensure the procurement source provides valid traceability documentation for aerospace or military specifications if applicable.

Selection Notes

Select this component when a stable 15 V reference is needed in a compact axial package. The 500 mW rating allows for moderate current handling without excessive heat sinking. Consider the tight tolerance requirements of your circuit design, as standard commercial versions typically offer ±5% accuracy compared to tighter grades available in specialized series.

Part Context

This part belongs to the widely recognized 1N47xx series of Zener diodes, which are industry-standard components for low-power voltage regulation. The 1N4702 specifically targets the 15 V segment of this family. Its DO-35 package is a legacy form factor still prevalent in through-hole designs, bridging older equipment maintenance with modern manufacturing where space permits.

Replacement Considerations

Equivalent parts include the 1N4742A and 1N5918B. Verify pinout compatibility and thermal derating curves before substitution. Different manufacturers may vary slightly in leakage current specifications despite sharing the same nominal voltage rating.