1N4757A

Overview

The Fairchild Semiconductor 1N4757A is a silicon unidirectional voltage regulator diode housed in the DO-41 axial through-hole package. It provides a nominal Zener voltage of 51 V with a tolerance of ±5%. The device supports a maximum power dissipation of 1 W and operates within a junction temperature range from -65 °C to +200 °C. Key electrical characteristics include a maximum reverse leakage current of 5 µA at 22.8 V and a dynamic impedance of 40 Ohms.

Feature Summary

• Provides stable voltage regulation for stabilizing and clipping circuits
• Features low reverse leakage current for efficient operation
• Constructed with silicon planar technology for reliability

Applications

• Voltage stabilization in electronic circuits
• Waveform clipping applications
• General-purpose voltage reference

Procurement Notes

Verify the specific manufacturer source, as Vishay Semiconductors also produces this part number. Confirm that the component matches the Fairchild Semiconductor origin if required by design specifications. Ensure the package type is DO-41 and the tolerance is ±5% before integration into production workflows.

Selection Notes

Select this component when a 51 V regulation point is required in a through-hole assembly. The 1 W power rating suits moderate current applications. Verify compatibility with operating temperatures up to 200 °C. Consider the 40 Ohm dynamic impedance for noise-sensitive designs requiring stable voltage clamping.

Part Context

This component belongs to the standard 1N47xx series of Zener diodes, widely used for basic voltage regulation. The 'A' suffix denotes a tighter ±5% voltage tolerance compared to the standard ±10% variant. It serves as a fundamental discrete semiconductor element for protecting sensitive components from overvoltage conditions.

Replacement Considerations

Equivalent parts include Vishay 1N4757A and Taiwan Semiconductor 1N4757AHR1G. Verify that replacement units maintain the same 51 V nominal voltage, 1 W power rating, and DO-41 package dimensions to ensure mechanical and electrical compatibility.