1N6354US

Overview

The Microchip Technology 1N6354US is a military-qualified Zener voltage regulator diode housed in a B-SQ MELF package. It provides a nominal Zener voltage of 180V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and features a steady-state power dissipation rating 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 50 ohms at the test current of 0.68mA, and a surge current capability of 137A for an 8.3ms square wave.

Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability.
• Qualified per MIL-PRF-19500/533 standards for critical applications.
• Inherently radiation hard and non-sensitive to electrostatic discharge (ESD).
• Surface mount equivalent of the JEDEC registered 1N6309 through 1N6355 series.

Applications

• High-reliability aerospace systems requiring failure-intolerant components.
• Military-grade voltage regulation circuits.
• Radiation-hardened electronic environments.

Procurement Notes

Verify the specific reliability level required, as JAN, JANTX, JANTXV, and JANS variants exist within this part family. Confirm RoHS compliance status if applicable, noting that compliant versions are available only on commercial grades. Ensure the ordering suffix matches the desired voltage tolerance and packaging configuration before finalizing procurement.

Selection Notes

Select the 1N6354US when a precise 180V regulation point is needed in a surface-mount form factor. Consider the thermal resistance values (RθJEC) for derating calculations based on the specific end-cap attachment method. Verify that the operating current remains within the specified limits to maintain stable voltage regulation across the full temperature range.

Part Context

This component belongs to the 1N6309US through 1N6355DUS series of 0.5-watt Zener diodes. The series offers a wide selection of voltages from 2.4V to 200V. The US designation indicates the B-SQ MELF surface mount package, while axial-leaded DO-35 options are available under different nomenclature.

Replacement Considerations

Direct substitutes include other manufacturers' equivalents meeting MIL-PRF-19500/533 specifications for the 1N6354 voltage class. Cross-reference must verify identical package dimensions, hermetic sealing requirements, and metallurgical bond categories.