1N4685

Overview

The Microchip Technology 1N4685 is a 3.6 V Zener voltage regulator diode housed in a hermetically sealed glass DO-7 (DO-204AA) axial-lead package. It operates within a temperature range of -65°C to +175°C and dissipates up to 500 mW at lead temperatures below 25°C. The device features a standard ±5% voltage tolerance, a maximum reverse leakage current of 7.5 µA, and a forward voltage of 1.1 V maximum at 200 mA.

Feature Summary

• Hermetically sealed glass construction with internal metallurgical bonding
• Inherently radiation hard design
• ESD nonsensitive per MIL-STD-750 Method 1020

Applications

• Voltage regulation over broad operating current and temperature ranges
• Military and aerospace screening applications requiring JAN, JANTX, JANTXV, or JANS options
• General purpose low-power voltage reference circuits

Procurement Notes

Verify the specific manufacturer origin, as the component is historically associated with Microsemi and currently listed under Microchip Technology. Confirm that the ordering suffix matches the required tolerance level, as standard parts carry no suffix while tighter tolerances require specific letters. Ensure the package type aligns with the DO-7 specification for through-hole mounting.

Selection Notes

Select this component for applications requiring a stable 3.6 V reference in harsh environments due to its wide operating temperature range and radiation hardness. Consider the tight thermal resistance specifications when designing on FR4 PCBs. Verify if military screening prefixes are necessary for the target deployment environment.

Part Context

This part belongs to the 1N4678 through 1N4717 series of 0.5 W Zener Voltage Regulators. The series provides a selection of voltages from 1.8 V to 43 V in standard 5% tolerances. These devices utilize a glass axial-leaded DO-7 package and are JEDEC registered.

Replacement Considerations

Equivalent DO-35 glass body axial-leaded versions are available within the same product family. Surface mount equivalents exist in the DO-213AA package outline by adding UR or UR-1 suffixes to the part number.