1N6345US

Overview

The Microchip Technology 1N6345US is a military-qualified Zener voltage regulator featuring a voidless hermetically sealed glass MELF package. It provides a nominal Zener voltage of 75V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and supports a steady-state power dissipation of 0.5W at an end cap temperature of 150°C. Electrical characteristics include a maximum reverse current of 80µA at 25°C, a dynamic impedance of 180 ohms at the test current of 1.7mA, and a surge current rating of 56A.

Feature Summary

• Hermetically sealed voidless hard glass construction with tungsten slugs for high-reliability environments.
• Internal metallurgical bonds ensuring robustness against failure in critical applications.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Available in multiple reliability levels including JAN, JANTX, JANTXV, and JANS.

Applications

• High-reliability aerospace systems where component failure is not tolerated.
• Military-grade electronic circuits requiring strict environmental sealing.
• Voltage regulation in harsh operating conditions involving extreme temperatures or radiation.

Procurement Notes

Verify the specific reliability level required, as the base part number covers JAN through JANS grades. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military specifications. Ensure the ordering suffix matches the desired voltage tolerance and packaging format. Consult official documentation for derating curves and thermal resistance values relevant to your specific PCB layout and ambient conditions.

Selection Notes

Select this component when a surface-mount equivalent to the axial-leaded 1N63xx series is needed without compromising hermetic sealing. The 1N6345US offers a 75V breakdown suitable for mid-range voltage regulation tasks. Consider the thermal resistance parameters for heat dissipation planning. Verify that the 0.5W power rating aligns with the expected load current and ambient temperature constraints of the target application design.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of Zener diodes manufactured by Microchip Technology. The series is designed as the surface-mount MELF counterpart to the JEDEC registered axial-leaded 1N6309 through 1N6355 components. All parts in this family share identical mechanical construction standards and are qualified under MIL-PRF-19500/533.

Replacement Considerations

Direct replacements must match the 75V Zener voltage and MELF package dimensions. Equivalent axial-leaded parts include the 1N6345. Verify that any substitute maintains the required hermetic seal and metallurgical bond category for the intended reliability level.