1N5519UR-1/TR

Overview

The Microchip Technology 1N5519UR-1/TR is a low voltage avalanche Zener diode with a nominal breakdown voltage of 3.6 V at a test current of 20 mA. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 0.5 W. The device features a DO-213AA MELF surface mount package with a metallurgical bond option, offering high reliability and radiation hardness.

Feature Summary

• Hermetically sealed glass MELF package with internal metallurgical bond
• Qualified per MIL-PRF-19500/437 for JAN, JANTX, and JANTXV levels
• Inherently radiation hard and non-sensitive to ESD
• Minimal capacitance suitable for sensitive signal applications

Applications

• Voltage regulation in harsh environments
• Reference voltage sources in aerospace systems
• Protection circuits requiring radiation tolerance
• Precision instrumentation operating over wide temperature ranges

Procurement Notes

Verify the specific military qualification level (JAN, JANTX, or JANTXV) required for your application, as performance parameters vary by grade. Confirm RoHS compliance status if environmental regulations apply, noting that RoHS versions are available only on commercial grades. Ensure the tape and reel packaging matches your automated assembly equipment specifications before ordering.

Selection Notes

Select this component when a hermetically sealed surface mount Zener diode with proven radiation hardness is necessary. The 1N5519UR-1 provides a stable 3.6 V reference with tight tolerance options. Consider the thermal resistance characteristics and derating curves for high-temperature operation scenarios to ensure reliable long-term performance in demanding electronic designs.

Part Context

This part belongs to the 1N5518BUR-1 through 1N5546BUR-1 series of low voltage avalanche Zener diodes manufactured by Microchip Technology. These devices are designed to replace traditional axial-leaded equivalents in modern surface mount assemblies while maintaining the high reliability standards required for military and aerospace electronics applications.

Replacement Considerations

Direct replacements include other qualified parts from the same series such as 1N5518UR-1 or 1N5520UR-1 depending on the required voltage tolerance. Verify that any substitute maintains the same DO-213AA MELF footprint and meets the specific MIL-PRF-19500/437 qualification level needed for your system.

FAQ

What does the 'UR-1' suffix indicate?

The 'UR' indicates a surface mount MELF package, and the '-1' denotes an internal metallurgical bond construction.

Is this device radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi’s MicroNote 050.

How is polarity identified on the package?

Polarity is indicated by a cathode band; the banded end should be positive with respect to the opposite end for Zener regulation.