1N4745UR/TR

Overview

The Microchip Technology 1N4745UR/TR is a surface mount glass Zener diode with a nominal voltage of 16 V and a standard tolerance of ±5%. It operates within a power dissipation range up to 1.0 W at 25°C, featuring a maximum dynamic impedance of 16 Ohms at a test current of 15.5 mA. The device supports an operating temperature range from -65°C to +175°C and utilizes the DO-213AB MELF package.

Feature Summary

• Hermetically sealed glass MELF package for high reliability
• Surface mount design suitable for high density mounting
• Inherently radiation hard per MicroNote 050

Applications

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

Procurement Notes

Verify the specific manufacturer origin as the part number appears under both Microchip and Microsemi branding in public records. Confirm that the TR suffix correctly denotes tape and reel packaging. Ensure compliance requirements match the intended application environment before finalizing procurement orders.

Selection Notes

Select this component when a surface mount equivalent to the axial 1N4745A is required. The DO-213AB package provides a leadless option ideal for automated assembly processes. Consider the thermal resistance characteristics if the application involves significant steady-state power dissipation on FR4 PCBs.

Part Context

This device belongs to the 1N4728UR through 1N4764AUR series of 1-watt surface mount Zener diodes. It serves as the surface mount counterpart to the JEDEC registered 1N4728A through 1N4764A axial series, maintaining electrical equivalence while adapting to the DO-213AB outline.

Replacement Considerations

The 1N4745A is the direct axial-leaded equivalent. For surface mount replacements, verify compatibility with other manufacturers' DO-213AB packages offering identical 16 V Zener voltage and 1 W power rating.