1N4746AP/TR8

Overview

The Microchip Technology 1N4746AP/TR8 is a Zener voltage regulator diode designed for through-hole mounting in the DO-35-2 package. It provides a nominal Zener voltage of 18 V with a tight tolerance of ±5%. The device features a maximum power dissipation of 500 mW and operates within an extended temperature range from -65°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 50 nA, a Zener impedance of 20 Ohms at a test current of 14 mA, and a forward voltage of 1.2 V at 200 mA.

Feature Summary

• Provides stable voltage regulation with a nominal 18 V output and ±5% tolerance
• Capable of operation across an extended industrial temperature range up to +175°C
• Features low reverse leakage current for efficient performance in high-resistance circuits

Applications

• Precision voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in sensitive electronic systems
• Clamping applications in signal conditioning paths

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number with official Microchip Technology documentation. Confirm that the specific suffix matches the required package and tape-and-reel specifications. Ensure compliance with relevant environmental standards prior to integration into final assemblies.

Selection Notes

Select this component when a precise 18 V regulation point is required with tight tolerance constraints. The DO-35-2 axial package suits through-hole PCB layouts. Consider the 500 mW power rating and thermal management requirements for the intended operating environment.

Part Context

This component belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. It utilizes the DO-35 glass passivated junction construction typical for this form factor. The device serves as a fundamental discrete semiconductor element for voltage control and protection tasks.

Replacement Considerations

Compatible substitutes include other manufacturers' 1N4746A variants in the DO-35 package. Verify that replacement parts match the 18 V nominal voltage, ±5% tolerance, and 500 mW power dissipation ratings to ensure circuit compatibility.