1N4559B

Single Zener Diodes Overview

The Microchip Technology 1N4559B is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.7V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 50W at case temperature, making it suitable for high-power regulation tasks. It utilizes a TO-204AD (TO-3) through-hole package with two leads and a tab for mounting. The component exhibits a typical dynamic impedance of 0.12 Ohms, ensuring stable voltage output under varying current conditions.

Single Zener Diodes Feature Summary

• High power dissipation capability of 50W for robust voltage regulation
• Precision Zener voltage tolerance of ±5% for accurate reference levels
• Low dynamic impedance characteristics for stable performance
• Durable TO-204AD (TO-3) through-hole package for secure mounting

Single Zener Diodes Applications

• High-power voltage regulation circuits
• Overvoltage protection systems
• Reference voltage sources in industrial equipment

Single Zener Diodes Procurement Notes

Verify the manufacturer source carefully, as the 1N4559B has been produced by multiple entities including Microchip, Microsemi, Motorola, and New Jersey Semi-Conductor. Ensure the datasheet matches the specific lot and generation required for your design. Confirm the package type is TO-204AD (TO-3) and check for any specific ordering suffixes that might indicate variations in testing or packaging. Cross-reference the part number with authorized distributors to avoid counterfeit components.

Single Zener Diodes Selection Notes

Select this component when a 4.7V regulated supply is needed with significant power handling requirements. The 50W rating allows for operation in environments where heat dissipation is managed via heatsinking. Consider the TO-3 package size constraints and thermal management needs. Compare against lower-power Zener diodes if space is limited, or higher-voltage variants if system requirements differ. Ensure the circuit can handle the potential fault currents associated with a 50W device.

Single Zener Diodes Part Context

The 1N4559B belongs to the family of standard 50W Zener diodes, historically significant in power electronics. Originally specified by various semiconductor manufacturers, it remains a common choice for legacy and new designs requiring robust voltage clamping. The part is often used in power supplies, battery chargers, and industrial control panels where reliability and power capacity are critical.

Single Zener Diodes Replacement Considerations

Equivalent parts include other 50W, 4.7V Zener diodes in TO-3 packages from manufacturers like Vishay or ON Semiconductor. Verify pinout compatibility and thermal resistance values before substitution. Some modern equivalents may offer improved thermal performance or tighter tolerances.