1N6355/TR

Overview

The Microchip Technology 1N6355/TR is a military-qualified Zener voltage regulator diode from the 1N6309 through 1N6355 series. It features a nominal Zener voltage of 200 V with a standard tolerance of ±5%. The device operates at a maximum steady-state power dissipation of 0.5 W and includes a test current (IZT) of 0.65 mA. It utilizes a DO-35 axial leaded package with voidless hermetically sealed glass construction.

Feature Summary

• Hermetically sealed voidless hard glass package with tungsten slugs for robust construction
• Internal metallurgical bonds ensuring high reliability in critical applications
• Qualified per MIL-PRF-19500/533 for JAN, JANTX, JANTXV, and JANS levels
• Inherently radiation hard and non-sensitive to electrostatic discharge

Applications

• High-reliability aerospace systems where failure cannot be tolerated
• Military electronic circuits requiring strict environmental resilience
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened circuit designs

Procurement Notes

Verify the specific reliability level required, as the base part number covers multiple qualification grades including JAN, JANTX, JANTXV, and JANS. Confirm whether RoHS compliance is necessary, noting that compliant versions are available only on commercial grade products. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration before finalizing procurement.

Selection Notes

Select this component when a 200 V Zener reference is needed within a small DO-35 footprint. Consider the thermal resistance characteristics, which vary between 95.5 °C/W and 150 °C/W depending on the internal bond category. Evaluate the dynamic impedance and noise density specifications against circuit sensitivity requirements. Verify that the operating temperature range of -65°C to +175°C aligns with the system environment.

Part Context

This device belongs to the industry-standard JEDEC registered 1N6309 through 1N6355 series. It serves as the surface-mount equivalent to older axial packages but is offered here in the traditional DO-35 form factor. The series provides extensive voltage selections ranging from 2.4 V to 200 V, catering to diverse voltage regulation needs across various industrial and defense sectors.

Replacement Considerations

Direct replacements include other manufacturers' 1N6355 variants meeting MIL-PRF-19500/533 standards. Cross-reference electrical parameters such as dynamic impedance and reverse leakage current to ensure compatibility. Verify package dimensions and terminal finish compatibility during substitution.