1N6487US/TR

Overview

The Microchip Technology 1N6487US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 3.9V and a maximum dynamic impedance of 9 Ohms at the test current of 64mA. It features a hermetically sealed void-less glass package rated for 1.5W steady-state power dissipation at 25°C ambient temperature. The device operates within a junction and storage temperature range of -65°C to +175°C, utilizing internal metallurgical bonds for high-reliability performance.

Feature Summary

• Hermetically sealed void-less glass construction with tungsten slugs
• Internal Category III metallurgical bonds for enhanced robustness
• Triple-layer passivation for extreme environmental resistance
• Qualified per MIL-PRF-19500/406 military standards

Applications

• High-reliability aerospace systems requiring radiation hardness
• Military-grade voltage regulation circuits
• Critical infrastructure electronics where failure is not tolerated
• Harsh environment power supply stabilization

Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate qualification standards but do not alter the electrical function. Confirm RoHS compliance status, noting that compliant versions are available only in commercial grades. Ensure ordering suffixes match the exact tolerance and packaging specifications defined in the official datasheet nomenclature.

Selection Notes

Select this component when a 3.9V reference is needed in a surface mount form factor with strict hermetic sealing requirements. The 1N6487US series offers tighter tolerances compared to standard JEDEC equivalents. Consider the thermal impedance characteristics for pulsed applications and ensure the operating current remains within the specified continuous and surge limits to maintain stability across the full temperature range.

Part Context

This part belongs to the 1N6485US through 1N6491US series, which provides low-voltage Zener options ranging from 3.3V to 5.6V. These devices share the same A-package MELF surface mount footprint and mechanical dimensions as the higher voltage 1N4460US through 1N4496US series, allowing for design flexibility while maintaining consistent physical integration parameters.

Replacement Considerations

Direct replacements include other qualified levels of the 1N6487US series such as JAN1N6487US, JANTX1N6487US, or JANTXV1N6487US. Commercial grade equivalents like 1N6487US without military suffixes may be used if hermetic sealing is not required. Verify that any substitute maintains the same 3.9V nominal voltage and 1.5W power rating.