1N4728A-T

Overview

The Vishay General Semiconductor - Diodes Division 1N4728A-T is a silicon Zener diode designed for voltage regulation applications. It features 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 and operates within a temperature range of -65 °C to +175 °C. Packaged in the DO-41 axial through-hole format, it utilizes a glass passivated junction construction. Key electrical characteristics include a maximum reverse leakage current of 100 µA at 25.1 V and a Zener impedance of 10 Ω measured at a test current of 76 mA.

Feature Summary

• Hermetically sealed glass package providing environmental protection
• Oxide passivated die for enhanced reliability
• Metallurgically bonded construction for thermal stability

Applications

• Voltage reference circuits
• Overvoltage protection
• Clamping applications

Procurement Notes

Verify the specific suffix against the manufacturer's official documentation to confirm packaging type and compliance status. Ensure the component matches the required DO-41 form factor and 1 W power rating for your design. Cross-reference the datasheet revision date to validate parameter accuracy before integration into production systems.

Selection Notes

Select this component when a stable 3.3 V reference is required in high-temperature environments up to 175 °C. The DO-41 through-hole package facilitates manual assembly or standard PCB mounting. Consider the 10 Ω impedance value for dynamic load regulation requirements and ensure the circuit can handle the 1 W power dissipation under worst-case conditions.

Part Context

This part belongs to the 1N47xxA series of one-watt silicon Zener diodes manufactured by Vishay. The series covers a wide voltage range from 3.3 V to 100 V. These devices are characterized by their robust glass passivation and metallurgical bonding, making them suitable for demanding industrial and commercial applications requiring reliable voltage regulation.

Replacement Considerations

Compatible substitutes include the 1N4728A from onsemi and Motorola/NXP, which share identical electrical specifications and DO-41 packaging. Verify that any replacement maintains the same 3.3 V nominal voltage, 1 W power rating, and ±5% tolerance to ensure circuit compatibility.