1N4746A-TP

Overview

The MCC 1N4746A-TP is a silicon planar Zener diode housed in a hermetic DO-41 glass package. It provides an 18 V nominal Zener voltage with a ±5% tolerance, tested at 14 mA. The device supports a maximum power dissipation of 1 W and exhibits a dynamic impedance of 20 Ohms at the test current. Maximum reverse leakage current is specified as 5 µA at 13.7 V. Operating temperatures range from -65°C to +200°C.

Feature Summary

• Hermetic glass construction for environmental stability
• Silicon planar technology for consistent performance
• High thermal resistance capability up to 200°C

Applications

• DC power supply voltage regulation
• Overvoltage protection circuits
• Reference voltage generation

Procurement Notes

Verify authenticity by purchasing directly from Micro Commercial Components or authorized distributors. Counterfeit parts are prevalent; unauthorized sources lack traceability and warranty coverage. Confirm RoHS compliance status via official documentation before integration.

Selection Notes

Select this component for through-hole applications requiring stable 18 V regulation. Ensure circuit design accommodates the 1 W power rating and derating requirements above 100°C. Verify that the 20 Ohm dynamic impedance meets signal integrity needs.

Part Context

This part belongs to the 1N47xx series of general-purpose Zener diodes manufactured by Micro Commercial Components. The series covers voltages from 3.3 V to 75 V. The 'TP' suffix indicates tape and reel packaging availability.

Replacement Considerations

Cross-reference with other manufacturers offering 1N4746 equivalents in DO-41 packages. Verify matching electrical parameters including 18 V tolerance, 1 W rating, and temperature coefficients before substitution.