1N4728A_T50R

Overview

The onsemi 1N4728A_T50R is a hermetically sealed glass silicon Zener diode with a nominal voltage of 3.3 V and a tolerance of ±5%. It operates within a junction temperature range of -65°C to +200°C and features a DO-41 axial leaded package. The device provides a maximum power dissipation of 1.0 W at a lead temperature of 50°C or less, requiring a derating factor of 6.67 mW/°C above this threshold. Electrical characteristics include a test current of 76 mA, a maximum Zener impedance (ZZ) of 10 Ω, and a leakage current of 1 μA at 100 V.

Feature Summary

• Hermetically sealed glass construction for reliable operation in harsh environments
• High thermal stability with an operating temperature range extending up to +200°C
• Robust surge handling capability via high non-repetitive peak reverse current ratings

Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in measurement instrumentation

Procurement Notes

Verify the specific T50R suffix against official documentation to confirm reel packaging specifications and quantity per unit. Ensure compliance with RoHS directives if required by your application standards. Cross-reference the manufacturer's marking codes to authenticate the component origin and production date code prior to integration into critical systems.

Selection Notes

Select this component when a precise 3.3 V reference is needed with strict tolerance requirements. The DO-41 package facilitates through-hole mounting, suitable for general-purpose circuit boards. Evaluate the thermal derating curve to ensure the 1.0 W limit is not exceeded during continuous operation under varying ambient temperatures.

Part Context

This part belongs to the 1N4728A–1N4758A series of one-watt Zener diodes manufactured by onsemi. The series covers a wide voltage range from 3.3 V to 56 V, utilizing a consistent DO-41 glass case design. These diodes are engineered for applications demanding stable voltage regulation and high reliability across extreme temperature conditions.

Replacement Considerations

Compatible substitutes include the Motorola/NXP 1N4728A and Vishay 1N4728A, which share identical electrical parameters and DO-41 package dimensions. Verify pinout orientation and marking conventions before substitution.