1N4755A BK TIN/LEAD

Overview

The Central Semiconductor Corp 1N4755A BK TIN/LEAD is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 43 V with a tolerance of ±5%. The device dissipates up to 1 W of power and operates within a temperature range of -65 °C to +200 °C junction temperature. Key electrical characteristics include a maximum reverse leakage current of 5 µA at 32.7 V and a Zener impedance of 125 Ω. It utilizes a DO-41 axial through-hole package.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon Zener structure.
• Engineered for high thermal stability with an extended operating temperature range up to 200 °C.
• Constructed in a robust DO-41 glass axial leaded package suitable for through-hole mounting.

Applications

• Industrial voltage regulation circuits
• Commercial equipment power supplies
• Entertainment system protection
• Computer application logic levels

Procurement Notes

Verify the specific suffix 'BK' against the manufacturer's official documentation to confirm tin/lead plating availability and RoHS compliance status, as this variant may differ from standard lead-free versions. Ensure the requested quantity matches the manufacturer's standard packaging configuration. Confirm that the 125 Ω impedance value aligns with your circuit requirements rather than assuming generic family specifications.

Selection Notes

Select this component when a 43 V reference point is required in high-temperature environments. The DO-41 package facilitates easy manual or automated through-hole assembly. Verify that the 1 W power dissipation rating meets the thermal design constraints of the target enclosure. Consider the 125 Ω dynamic impedance impact on regulation accuracy under varying load conditions compared to lower impedance alternatives.

Part Context

This part belongs to the 1N47xx series of 1 Watt Zener diodes produced by Central Semiconductor. The series covers a wide voltage range from 3.3 V to 100 V with standard 5% tolerances. These devices are widely used in general-purpose electronics due to their reliability and standardized axial package form factor, serving as fundamental components for overvoltage protection and reference voltage generation.

Replacement Considerations

Direct parameter-equivalent substitutes include the 1N4755A from onsemi and Vishay General Semiconductor. Both manufacturers offer variants in the DO-41 package with matching 43 V and 1 W ratings. Verify pinout compatibility and ensure the replacement part supports the required 200 °C junction temperature if operating in extreme conditions.