1N4985US

Single Zener Diodes Overview

The Microchip Technology 1N4985US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 130 V and a test current of 10 mA. It features a maximum dynamic impedance of 190 Ohms at the test point and 2 Ohms at a knee current of 1 mA. The device supports a maximum continuous current of 36.6 mA and a surge current of 0.8 A for an 8.3 ms square wave pulse. It dissipates up to 5 Watts at an end cap temperature of 140°C, with a thermal resistance of 7°C/W from junction to end cap.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass package with internal metallurgical bonds
• Military qualified to MIL-PRF-19500/356 standards
• Inherently radiation hard construction
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Radiation-hardened circuit protection

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required military qualification level (JAN, JANTX, or JANTXV) as specified in the datasheet. Confirm the specific tolerance requirements against the standard 5% baseline. Ensure the procurement documentation explicitly references MIL-PRF-19500/356 compliance for acceptance testing criteria.

Single Zener Diodes Selection Notes

Select this component when a robust surface mount solution is required for high-power regulation. The 5 Watt rating allows for significant power handling in a compact E-package form factor. Consider the operating temperature range of -65°C to +175°C for extreme environment compatibility.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of industry-recognized 5 Watt Zener regulators. These devices are designed for applications where reliability is critical. The series offers a wide selection of voltages from 3.3 to 390 volts within the same physical package footprint.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents such as the 1N4985 are available by removing the US suffix. Other variants within the 1N4954US through 1N4996US series share identical mechanical dimensions but differ in electrical characteristics.