1N6342US

Overview

The Microchip Technology 1N6342US is a 56V Zener voltage regulator diode housed in a B-SQ MELF glass package. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5W at an end cap temperature of 150°C. The device features a nominal Zener voltage of 56V with a standard tolerance of ±5%, tested at 2.2mA. It exhibits a maximum dynamic impedance of 100 ohms at the test current and 1,200 ohms at 250µA. The unit supports a maximum surge current of 2.5A for an 8.3ms square wave.

Feature Summary

• Hermetically sealed voidless hard glass construction with tungsten slugs
• Internal metallurgical bonds ensuring high reliability
• Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020
• Inherently radiation hard

Applications

• High-reliability military applications where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Surface mount equivalents for JEDEC registered axial-leaded series

Procurement Notes

Verify the specific reliability level required (JAN, JANTX, JANTXV, or JANS) as these levels are available per MIL-PRF-19500/533. Confirm RoHS compliance status, noting that compliant versions are available on commercial grade only. Ensure the ordering suffix matches the desired voltage tolerance and termination finish specifications.

Selection Notes

Select this component for surface mount designs requiring robust, hermetically sealed Zener regulators. The 1N6342US provides a 56V breakdown suitable for mid-range voltage clamping. Consider thermal resistance values when designing PCB layouts, as junction-to-ambient resistance is 240°C/W under defined conditions. Verify compatibility with existing axial-leaded footprints if transitioning from DO-35 packages.

Part Context

This part belongs to the 1N6309US through 1N6355DUS series of 0.5W Zener voltage regulators. The series offers selections from 2.4V to 200V with standard 5% tolerances and tighter 1% and 2% options. It serves as the surface mount equivalent to the industry-recognized 1N6309 through 1N6355 axial-leaded series.

Replacement Considerations

Direct replacements include other parts within the 1N6309US–1N6355US series or their axial-leaded counterparts (DO-35). Verify that substitute components match the required reliability level and voltage tolerance specifications.