1N6343US

Overview

The Microchip Technology 1N6343US is a military-qualified Zener voltage regulator featuring a B-SQ MELF surface mount package. It provides a nominal Zener voltage of 62 V 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 0.5 W at an end cap temperature of 150 °C. Key electrical parameters include a maximum reverse current of 80 µA at 150 °C, a dynamic impedance of 125 ohms at the test current, and a surge current rating of 1,300 mA.

Feature Summary

• Hermetically sealed voidless glass construction utilizing internal metallurgical bonds for high reliability.
• Surface mount equivalent of the JEDEC registered 1N6309 through 1N6355 series.
• Inherently radiation hard and non-sensitive to electrostatic discharge per MIL-STD-750 method 1020.

Applications

• High-reliability applications where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Military and aerospace electronic systems

Procurement Notes

Verify that the specific order matches the required reliability level (JAN, JANTX, JANTXV, or JANS) as commercial versions differ in qualification. Confirm RoHS compliance status if environmental regulations apply, noting that compliant finishes are available on commercial grades only. Ensure the procurement documentation references the correct part nomenclature suffixes for voltage tolerance and packaging specifications.

Selection Notes

Select this component when a robust surface mount Zener diode is required for critical circuits. The 1N6343US offers a 62 V breakdown suitable for mid-range regulation tasks. Consider the thermal resistance characteristics and derating curves for PCB layout planning. Verify that the application environment does not exceed the specified maximum junction temperature limits during operation.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of voidless hermetically sealed glass Zener diodes. The series covers a wide voltage selection from 2.4 to 200 volts with various tolerance options. These regulators are designed for industries requiring extreme durability and consistent performance under harsh conditions.

Replacement Considerations

Direct replacements must match the 1N6343US electrical ratings and B-SQ MELF package dimensions. Equivalent parts should maintain the same voltage tolerance and hermetic sealing standards to ensure compatibility with existing MIL-PRF-19500/533 qualified designs.