1N4728A-TP

Overview

The MCC 1N4728A-TP is a silicon planar Zener diode housed in a hermetic DO-41 glass package. It provides a nominal Zener voltage of 3.3 V with a 5% tolerance, tested at 76 mA. The device dissipates up to 1.0 W at 50°C ambient temperature and features a maximum reverse leakage current of 100 µA at 1 V. Dynamic impedance is specified as 10 Ω at the test current and 400 Ω at knee current. Operating temperatures range from -65°C to +200°C.

Feature Summary

• Hermetically sealed glass construction for environmental stability
• Silicon planar technology for consistent electrical performance
• High thermal resistance capability supporting 1.0 W power dissipation

Applications

• Voltage regulation in low-voltage DC circuits
• Overvoltage protection for sensitive semiconductor components
• Reference voltage generation in analog signal processing

Procurement Notes

Verify authenticity through authorized distributors due to industry counterfeiting risks. Confirm RoHS compliance status via official documentation, noting specific exemptions may apply to lead content within the glass seal. Ensure ordering suffixes match required packaging formats such as tape-and-reel or ammo boxes.

Selection Notes

Select this component when a precise 3.3 V reference is required with tight 5% voltage tolerance. Evaluate thermal derating requirements if operating above 50°C ambient conditions. Consider the high dynamic impedance at low currents compared to higher voltage variants when designing for low-current applications.

Part Context

This part belongs to the standard 1N4728 series of 1-watt Zener diodes manufactured by Micro Commercial Components. The 'A' suffix indicates a 5% voltage tolerance, distinguishing it from standard (10%) or precision (2%) variants. The '-TP' suffix designates tape-and-reel packaging for automated assembly processes.

Replacement Considerations

Cross-reference with Vishay 1N4728A or onsemi 1N4728A for equivalent specifications. Verify that substitute parts maintain the same DO-41 footprint and hermetic sealing characteristics to ensure mechanical compatibility.