1N4746PE3/TR8

Overview

The Microchip Technology 1N4746PE3/TR8 is a silicon 1-watt Zener diode in the 1N4728AP-1N4764AP series. It provides voltage regulation with an 18V nominal Zener voltage and 5% tolerance. The device operates within a temperature range of -65°C to +150°C, featuring a maximum dynamic impedance of 20 Ohms at a test current of 14mA. Packaged in a DO-41 axial lead plastic case, it includes RoHS compliant annealed matte-tin plating and tape & reel packaging.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features flexible axial-lead mounting terminals for standard through-hole applications
• Constructed with void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020

Applications

• Voltage regulation circuits requiring 1W power dissipation
• Power supply reference voltage generation
• Overvoltage protection in electronic systems

Procurement Notes

Verify the specific manufacturer origin, as the part number may be sourced from Microsemi or Microchip Technology depending on corporate integration history. Confirm that the 'e3' suffix indicates RoHS compliance and the 'TR' suffix denotes tape and reel packaging. Ensure the component meets the required JEDEC registration standards and check for any military screening prefixes if high-reliability variants are needed.

Selection Notes

Select this component when a 18V Zener voltage with 5% tolerance is required in a plastic axial package. Consider the 1W power rating and thermal resistance characteristics for heat management. Verify compatibility with surface mount equivalents like SMAJ4746A if space constraints exist. Ensure the operating environment stays within the specified -65°C to +150°C temperature range.

Part Context

This part belongs to the popular 1N4728AP thru 1N4764AP series of 1.0 watt Zener diodes. The series offers extensive voltage selection from 3.3 to 100 volts. The plastic encapsulated version provides lower thermal resistance compared to glass-body options. These devices are moisture classified as Level 1, eliminating the need for dry pack storage.

Replacement Considerations

Surface mount equivalents such as SMAJ4746A and MLL4746A are available. Other manufacturers produce parameter-equivalent parts like the Central Semiconductor 1N4746A TR PBFREE.