1N4742UR/TR

Overview

The Microchip Technology 1N4742UR/TR is a surface mountable 1.0-watt glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 12V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum dynamic impedance of 9 Ohms at a test current of 21 mA. It includes a tape and reel option for automated assembly.

Feature Summary

• Hermetically sealed glass MELF package suitable for high reliability applications
• Surface mount design ideal for high density mounting with low parasitic requirements
• Inherently radiation hard per MicroNote 050
• ESD nonsensitive operation

Applications

• Voltage regulation in high density electronic circuits
• High reliability applications requiring source control drawings
• Low parasitic requirement circuit designs

Procurement Notes

Verify the specific suffix configuration against official datasheets, as ordering codes determine tolerance levels and compliance status. Confirm that the TR suffix indicates tape and reel packaging. Ensure compatibility with MIL-PRF-19500 screening if required by the application's source control drawing.

Selection Notes

Select this component when a 12V Zener reference is needed in a surface mount form factor. The DO-213AB package offers a leadless solution compared to axial equivalents. Consider the ±5% tolerance standard; tighter tolerances require different suffixes. Verify thermal derating curves for steady-state power dissipation based on ambient or end-cap temperatures.

Part Context

This part belongs to the 1N4728AUR through 1N4764AUR series of 1.0-watt glass Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers Zener voltages from 3.3V to 100V. These devices are electrically equivalent to the JEDEC registered 1N4728A through 1N4764A series but utilize the DO-213AB surface mount outline instead of the DO-41 axial package.

Replacement Considerations

1N4742AUR/TR