1N4755A

Overview

The Fairchild Semiconductor 1N4755A is a silicon unidirectional Zener voltage regulator diode designed for through-hole mounting in the DO-41 axial leaded package. It provides a nominal Zener voltage of 36 V with a standard tolerance of 5%. The device supports a power dissipation of 1 W at an ambient temperature of 25°C, derating linearly above this threshold. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 70 Ω at a test current of 6 mA. The component operates within a temperature range of -65°C to +200°C.

Feature Summary

• Glass passivated die construction for enhanced stability
• Hermetically sealed compression bonded design
• Low inductance typical structure

Applications

• Voltage regulation circuits
• Reference voltage sources
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer origin, as the 1N4755A designation is utilized by multiple vendors including Fairchild, onsemi, Vishay, and Tak Cheong. Confirm that the received unit matches the required 36 V specification, as some distributors may list conflicting voltage ratings such as 43 V for the same part number. Ensure compliance with RoHS standards if applicable to the specific production batch.

Selection Notes

Select this component when a stable 36 V reference is required in a high-power dissipation environment. The DO-41 package allows for robust mechanical mounting via axial leads. Consider the 5% voltage tolerance and 70 Ω dynamic impedance for precision requirements. Verify thermal management capabilities, as the 1 W rating requires adequate heat sinking or airflow to maintain operation below the maximum junction temperature.

Part Context

This device belongs to the 1N47xxA series of one-watt Zener diodes. The 'A' suffix typically denotes a 5% voltage tolerance. The series covers a wide range of voltages from 3.3 V to 100 V, sharing common physical dimensions and thermal characteristics while differing in breakdown voltage specifications.

Replacement Considerations

Equivalent parts include the Vishay 1N4755A and onsemi 1N4755A. Cross-reference with other manufacturers using the JEDEC DO-41 form factor. Verify pinout polarity and package dimensions before substitution.