1N4728A-T50A

Overview

The onsemi 1N4728A-T50A is a silicon Zener voltage regulator diode designed for through-hole mounting in the DO-41 glass axial leaded package. It provides a nominal Zener voltage of 3.3 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W at an ambient temperature of 25°C, with a derating factor of 6.67 mW/°C above this threshold. Key electrical characteristics include a maximum reverse leakage current of 100 µA and a Zener impedance of 400 Ω. The component operates within a junction temperature range of -65°C to +200°C.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• Oxide passivated die for enhanced stability
• Metallurgically bonded internal structure

Applications

• Voltage regulation circuits
• Clipping and clamping applications
• Reference voltage sources

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4728A part number is utilized by multiple semiconductor vendors including Vishay, Nexperia, and Motorola/NXP. Confirm that the T50A suffix corresponds to the Ammo Pack packaging format required for your assembly process. Ensure the selected unit meets the specific thermal and electrical tolerances defined in the official datasheet for your operating environment.

Selection Notes

Select this component for applications requiring a stable 3.3 V reference with high power handling capabilities relative to smaller signal diodes. The DO-41 package facilitates manual insertion or standard through-hole automated assembly. Consider the 400 Ω dynamic impedance when designing for low-noise precision requirements, as higher impedance may impact regulation accuracy under varying load conditions.

Part Context

This component belongs to the widely recognized 1N47xx series of one-watt Zener diodes. The 'A' suffix typically denotes a tighter 5% voltage tolerance compared to the standard 10% tolerance found in the base 1N4728 model. The series covers a broad voltage range from 3.3 V to 100 V, making it a standard choice for general-purpose power supply regulation and protection circuits across various industrial electronics.

Replacement Considerations

Cross-reference with Vishay 1N4728A, Nexperia 1N4728A, and Motorola 1N4728A. Verify package compatibility (DO-41) and electrical parameters such as Zener voltage tolerance and power dissipation ratings before substitution.