1N6355

Overview

The Microchip Technology 1N6355 is a military-qualified Zener voltage regulator with a nominal breakdown voltage of 200 V and a maximum power dissipation of 0.5 W. It features a standard 5% voltage tolerance, a maximum reverse leakage current of 80 µA at 25 °C, and a dynamic impedance of 1,800 ohms. The device operates within a junction temperature range of -65 °C to +175 °C and utilizes a hermetically sealed glass package.

Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high-reliability environments.
• Qualified per MIL-PRF-19500/533 standards across JAN, JANTX, JANTXV, and JANS reliability levels.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD) per MIL-STD-750 method 1020.

Applications

• High-reliability aerospace and defense systems where failure cannot be tolerated.
• Voltage regulation circuits requiring broad operating current and temperature stability.
• Harsh environment electronics utilizing the robust DO-35 axial-lead package.

Procurement Notes

Verify that the specific ordering suffix matches the required reliability level (JAN, JANTX, JANTXV, or JANS) and voltage tolerance. Confirm compliance requirements, noting that RoHS compliant versions are available only on commercial grade parts. Ensure the procurement specification aligns with the hermetically sealed glass package and metallurgical bond category defined in the datasheet.

Selection Notes

Select this component when a 200 V Zener reference is needed in a ruggedized, leaded package. Consider the thermal resistance values for derating calculations based on lead temperature or ambient conditions. Evaluate the 1,800 ohm dynamic impedance against circuit sensitivity requirements. Verify that the 0.5 W power rating accommodates the expected operating current without exceeding thermal limits.

Part Context

This part belongs to the 1N6309 through 1N6355 series of industry-recognized 0.5 watt Zener regulators. The series provides selections from 2.4 to 200 volts with various tolerance options. While primarily offered in the DO-35 axial-lead package, surface-mount equivalents are available in the SQ MELF configuration for different mounting requirements.

Replacement Considerations

Direct replacements must match the 200 V nominal voltage, 0.5 W power rating, and MIL-PRF-19500/533 qualification. Verify package compatibility between DO-35 and alternative form factors if transitioning to surface mount variants like the 1N6355US.