1N4743UR-1/TR

Overview

The Microchip Technology 1N4743UR-1/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 13 V with a standard tolerance of +/- 5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse current of 5 µA at 7.6 V. Electrical characteristics include a test current of 19 mA, a dynamic impedance of 10 Ohms at IZT, and a maximum regulator current of 0.25 A at 50°C ambient.

Feature Summary

• Hermetically sealed glass construction for high reliability applications
• Surface mount design ideal for high density mounting requirements
• Inherently radiation hard per MicroNote 050
• Compatible with source control drawings (SCD)

Applications

• Voltage regulation in high density electronic circuits
• High reliability systems requiring hermetic sealing
• Radiation-hardened circuit designs

Procurement Notes

Verify that the ordering suffix matches the required tape and reel configuration, as the TR suffix indicates specific packaging standards. Confirm RoHS compliance status if environmental regulations apply, noting that e3 suffixes denote compliant variants. Ensure the component meets the specific source control drawing requirements if used in regulated environments. Cross-reference the manufacturer's datasheet for the most current electrical specifications and mechanical dimensions before finalizing procurement.

Selection Notes

Select this component when a 1.0 W power dissipation rating and DO-213AB surface mount footprint are required. The 13 V nominal voltage with 5% tolerance suits general regulation tasks. Consider the wide operating temperature range and radiation hardness for demanding environments. Verify thermal resistance limits against the PCB layout to ensure steady-state power ratings are maintained under expected ambient conditions.

Part Context

This part belongs to the 1N4728UR through 1N4764AUR series of surface mount Zener diodes. These devices are electrically equivalent to the JEDEC registered 1N4728A through 1N4764A axial leaded series but utilize the DO-213AB outline. The series covers Zener voltages from 3.3 V to 100 V, offering flexibility for various voltage regulation needs in compact form factors.

Replacement Considerations

The 1N4743A is the direct axial leaded equivalent. Surface mount alternatives include the MLL4743A designation. Verify pinout polarity and package dimensions when substituting with other manufacturers' parts.