1N4985

Single Zener Diodes Overview

The Microchip Technology 1N4985 is a military-qualified, voidless hermetically sealed 5-watt glass Zener diode. It provides a nominal voltage of 130 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and features an internal metallurgical bond. Electrical characteristics include a maximum reverse leakage current of 2 µA at 69.2 V and a maximum Zener impedance of 190 Ohms at the test current of 10 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonding for high reliability
• Military qualification compliant with MIL-PRF-19500/356 standards
• Inherently radiation hard design suitable for harsh environments
• ESD nonsensitive per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability aerospace systems where failure cannot be tolerated
• Military electronic circuits requiring robust voltage regulation
• Radiation-hardened power supply designs

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military specification level (JAN, JANTX, etc.) as suffixes denote different quality grades. Confirm package type and lead finish specifications against the procurement requirements. Ensure the supplier provides traceability documentation consistent with MIL-PRF-19500/356 standards for this component series.

Single Zener Diodes Selection Notes

Select the 1N4985 when a stable 130 V reference is needed in extreme thermal conditions up to +175°C. Consider the 5 W power dissipation rating and derating curves for thermal management. This component is appropriate for applications requiring hermetic sealing and radiation hardness, distinguishing it from commercial-grade alternatives.

Single Zener Diodes Part Context

This component belongs to the 1N4954 through 1N4996 series of 5-watt Zener voltage regulators manufactured by Microsemi (now Microchip Technology). The series is characterized by its voidless hermetically sealed glass packages and broad voltage selection ranging from 3.3 V to 390 V. These devices are industry-recognized for use in critical applications demanding long-term stability and environmental resilience.

Single Zener Diodes Replacement Considerations

Public confirmed substitute part numbers: JAN1N4985, JANTX1N4985, JANTXV1N4985.