1N4557B

Single Zener Diodes Overview

The Microchip Technology 1N4557B is a high-power Zener diode rated for 50 watts of power dissipation. It provides voltage regulation with a nominal Zener voltage of 27 volts and a tolerance of ±5%. The device features a maximum Zener impedance of 0.8 ohms and operates within a temperature range of -65°C to +175°C. Packaged in the TO-204AD (TO-3) through-hole format, it is designed for robust industrial applications requiring stable voltage reference or protection.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation across a wide operating temperature range
• High power handling capability suitable for demanding circuit environments
• Robust axial leaded construction for secure mechanical mounting

Single Zener Diodes Applications

• Industrial power supply voltage regulation
• Overvoltage protection circuits
• Voltage reference standards

Single Zener Diodes Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches required PCB footprint. Ensure thermal management design accommodates the 50W power rating. Check for specific military qualification requirements if applicable to the target application environment.

Single Zener Diodes Selection Notes

Select this component when high power dissipation and precise voltage regulation are required. Consider the TO-204AD package size for available board space. Evaluate thermal resistance requirements for the specific mounting configuration. Compare impedance characteristics against other series members to ensure compatibility with circuit sensitivity.

Single Zener Diodes Part Context

This part belongs to the 1N4557B-1N4564RB series of 50-watt Zener diodes manufactured by Microchip Technology. These devices are JEDEC registered and offer a broad range of voltage values from 3.9V to 200V. The series is known for reliability in harsh environments and is often used in critical infrastructure and aerospace applications.

Single Zener Diodes Replacement Considerations

Compatible substitutes include other 50W Zener diodes with matching voltage and package specifications. Verify that alternative parts meet the same impedance and leakage current requirements. Ensure thermal performance characteristics are equivalent to maintain system reliability.