1N6487US

Overview

The Microchip Technology 1N6487US is a surface mount Zener voltage regulator qualified to MIL-PRF-19500/406. It features a hermetically sealed void-less glass package with an internal metallurgical bond. The device provides a nominal Zener voltage of 3.9V at a test current of 64mA, with a maximum dynamic impedance of 9 Ohms and a maximum reverse current of 35µA. Rated for 1.5W steady-state power dissipation, it operates within a junction temperature range of -65°C to +175°C.

Feature Summary

• Hermetically sealed void-less glass construction with internal metallurgical bonds
• Military qualification per MIL-PRF-19500/406 standards
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Voltage regulation in extreme temperature environments

Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate the manufacturing lot testing and screening procedures. Confirm RoHS compliance status if environmental regulations apply, noting that commercial versions may differ from military grades. Ensure ordering suffixes match the exact tolerance and packaging specifications defined in the official datasheet.

Selection Notes

Select this component when a surface mount equivalent of axial lead Zener diodes is needed for high-reliability circuits. The 1N6487US offers a 3.9V regulation point suitable for low-voltage reference applications. Consider the thermal impedance characteristics and derating curves for high-power dissipation scenarios. Verify that the SQ-MELF package dimensions fit the available PCB real estate.

Part Context

This part belongs to the 1N6485US through 1N6491US series of surface mount Zener diodes. These devices serve as industry-recognized replacements for traditional axial-lead regulators, offering robust performance in compact form factors. The series covers voltages from 3.3V to 5.6V, providing options for various low-voltage regulation needs in military and industrial sectors.

Replacement Considerations

Direct substitutes include other parts within the 1N6485US–1N6491US series or commercial equivalents like the 1N4487US, provided they meet the specific MIL-PRF-19500/406 qualification requirements.