1N3049B-1/TR

Overview

The Microchip Technology 1N3049B-1/TR is a surface mount glass Zener diode with a nominal voltage of 160 V and a power dissipation rating of 1.5 W at 25°C. It operates within a temperature range of -65°C to +175°C and features a DO-213AB (MELF) package. The device exhibits a maximum reverse leakage current of 0.5 µA, a test current of 1.6 mA, and a maximum Zener impedance of 1100 Ω.

Feature Summary

• Hermetically sealed double-slug glass construction for high-reliability applications
• Metallurgically enhanced internal contact design providing lower thermal resistance
• Leadless surface mount package suitable for high-density mounting
• Inherently radiation hard

Applications

• High-density circuit board mounting
• High-reliability electronic systems
• Voltage regulation over broad operating currents and temperatures

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm screening levels and RoHS compliance status. Confirm that the TR suffix indicates tape and reel packaging per EIA-481-1-A standards. Ensure compatibility with recommended footprints for FR4 PC boards to maintain specified thermal resistance values during assembly.

Selection Notes

Select this component when a 1.5 W surface mount Zener diode is required for high-density designs. Consider its hermetic glass construction and radiation hardness for demanding environments. Verify that the 160 V nominal voltage and 1100 Ω impedance meet the specific circuit requirements compared to axial lead equivalents.

Part Context

This part belongs to the 1N3016BUR-1 through 1N3051BUR-1 series of surface mountable Zener diodes. It serves as a surface mount equivalent to the JEDEC registered 1N3016 through 1N3051 devices but utilizes the DO-213AB outline instead of the DO-13 package. The series offers higher power ratings and improved reliability characteristics.

Replacement Considerations

Equivalent axial lead parts include the 1N3049B. Surface mount alternatives in the MLL3049B series may be considered if package variations are acceptable.