1N6349US/TR

Overview

The Microchip Technology 1N6349US/TR is a surface-mount Zener voltage regulator with a nominal breakdown voltage of 110 V and a maximum steady-state power dissipation of 0.5 W. It operates within a junction temperature range of -65 °C to +175 °C. The device features a dynamic impedance of 500 ohms at the test current of 1.1 mA, with a maximum reverse leakage current of 10 µA at 25 °C and 80 µA at 150 °C. It utilizes a voidless hermetically sealed glass B-SQ MELF package.

Feature Summary

• Hermetically sealed voidless hard glass construction with tungsten slugs for high-reliability environments.
• Internal metallurgical bonds designed to prevent failure in critical applications.
• Inherently radiation hard and non-sensitive to electrostatic discharge.
• Capable of regulating voltage across a broad operating current and temperature range.

Applications

• High-reliability military and aerospace circuits
• Voltage regulation in extreme temperature environments
• Radiation-hardened electronic systems

Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for your application, as these levels dictate qualification standards per MIL-PRF-19500/533. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from qualified levels. Ensure the tape and reel packaging aligns with standard EIA-481-B specifications for automated assembly processes.

Selection Notes

Select this component when a robust, hermetically sealed surface-mount Zener diode is needed for voltages up to 200 V. Consider the thermal resistance values (junction-to-end cap and junction-to-ambient) for proper heat dissipation design. Verify that the 5% standard tolerance meets circuit requirements, or specify tighter tolerances via part nomenclature if necessary.

Part Context

This device belongs to the 1N6309US through 1N6355DUS series of 0.5 W glass Zener diodes. It serves as the surface-mount equivalent to the JEDEC registered axial-leaded 1N6309 through 1N6355 series. The series offers extensive voltage selections from 2.4 V to 200 V, providing a standardized solution for replacing through-hole components in compact surface-mount designs.

Replacement Considerations

Direct replacements include other manufacturers' surface-mount Zener diodes rated for 110 V and 0.5 W in a MELF package. For military-grade equivalents, verify compatibility with MIL-PRF-19500/533 specifications. Axial-leaded 1N6349 devices can be used if board space permits, though mechanical mounting will differ.