1N4687 (DO35)

Overview

The Microsemi Corporation 1N4687 is a silicon Zener diode housed in a DO-35 glass axial-lead package. It provides a nominal reference voltage of 4.3 V with a maximum power dissipation of 0.5 W. The device operates unidirectionally and features an isolated case connection. Standard tolerance is typically 5%, though tighter options exist within the series.

Feature Summary

• Provides stable voltage regulation over a broad operating current range
• Features internal metallurgical bond construction for enhanced reliability
• Utilizes hermetically sealed glass body packaging

Applications

• Precision voltage reference circuits
• Low noise signal conditioning
• Temperature-compensated bias networks

Procurement Notes

Verify the specific suffix (e.g., -1, D) to confirm metallurgical bonding and screening level. Confirm RoHS compliance status as standard commercial versions may differ from military equivalents. Ensure the DO-35 package matches the target footprint requirements.

Selection Notes

Select based on required voltage tolerance and test current conditions. The 1N4687 series supports low test currents around 50 µA for tight tolerances. Verify if the internal metallurgical bond option is necessary for the application environment.

Part Context

This component belongs to the JEDEC registered 1N4678 through 1N4717 series of 0.5 watt Zener voltage regulators. These devices are designed for applications requiring stable reference voltages with minimal temperature drift.

Replacement Considerations

Equivalent surface mount packages include MLL4687 or 1N4687UR. Axial lead alternatives include 1N4687D or 1N4687A depending on the required tolerance and screening specifications.