1N4746CE3/TR13

Overview

The Microchip Technology 1N4746CE3/TR13 is a silicon 1-watt Zener diode in the 1N4728AP to 1N4764AP series. It provides voltage regulation at a nominal Zener voltage of 18 V with a tight tolerance of ±2%, indicated by the 'C' suffix. The device operates within a temperature range of -65°C to +150°C and features a plastic DO-41 (DO-204AL) axial-lead package. Electrical characteristics include a maximum dynamic impedance of 20 Ohms at a test current of 14 mA, a maximum reverse current of 5 µA at 13.7 V, and a steady-state power dissipation of 1.0 watts.

Feature Summary

• Regulates voltage over a broad operating current and temperature range
• Provides flexible axial-lead mounting terminals for through-hole applications
• Features void-free transfer molded thermosetting epoxy body meeting UL94V-0 standards

Applications

• Voltage regulation circuits requiring precise tolerance
• Power supply reference voltage generation
• Over-voltage protection in electronic systems

Procurement Notes

Verify that the ordering suffix includes both 'e3' for RoHS compliance and 'TR' for tape and reel packaging. Confirm the 'C' suffix is present to ensure the required ±2% voltage tolerance. Check manufacturer documentation for specific military screening prefixes if higher reliability levels are needed. Ensure the component meets moisture classification Level 1 requirements without dry pack constraints.

Selection Notes

Select this component when a 1-watt power rating and an 18 V regulation point are required. The ±2% tolerance makes it suitable for precision applications compared to standard 5% or 10% variants. Choose the TR suffix for automated surface mount or axial insertion assembly processes. Consider the thermal resistance of 45 °C/W junction-to-lead for heat dissipation planning in enclosed environments.

Part Context

This part belongs to the JEDEC registered 1N4728A through 1N4764A series of 1-watt Zener diodes. The series offers an extensive voltage selection from 3.3 to 100 volts. The 'P' suffix denotes plastic construction, which provides lower thermal resistance compared to glass-body options. The 'e3' suffix indicates RoHS compliant annealed matte-Tin plating on the terminals.

Replacement Considerations

Public confirmed substitute part numbers: 1N4746A, 1N4746AP, 1N4746B.