1N4556B

Single Zener Diodes Overview

The Microchip Technology 1N4556B is a high-power 50 W Zener diode with a nominal voltage of 7.5 V and a ±5% tolerance. It operates within a junction temperature range of -65°C to +175°C and features a maximum DC power dissipation of 50 watts at a case temperature below 75°C. The device utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud, providing a thermal resistance of 2.0°C/W maximum from junction to base.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond for reliability
• Standard polarity configuration connects the anode directly to the metal case
• Inherently radiation hard and non-sensitive to electrostatic discharge
• Capable of regulating voltage across a broad operating current and temperature range

Single Zener Diodes Applications

• High power voltage regulation in industrial environments
• Power supply reference circuits requiring robust thermal performance
• Military and aerospace systems utilizing MIL-PRF-19500/358 qualified variants

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required tolerance level, as the 'B' suffix denotes a ±5% voltage tolerance. Confirm whether standard or reverse polarity is needed, noting that reverse polarity requires an 'R' suffix. Ensure the procurement documentation aligns with the manufacturer's latest datasheet specifications regarding mechanical dimensions and mounting hardware requirements.

Single Zener Diodes Selection Notes

Select this component when applications demand high power handling capabilities up to 50 watts. The DO-5 package facilitates direct mounting to heat sinks via the hexagonal stud. Consider the thermal derating curve for operation above 75°C case temperature. Verify compatibility with existing circuit designs regarding the specific 7.5 V breakdown voltage and impedance characteristics.

Single Zener Diodes Part Context

This part belongs to the 1N4549B through 1N4556B series of 50 Watt Zener diodes manufactured by Microsemi, now part of Microchip Technology. These devices are JEDEC registered and designed for rugged applications. The series covers a wide voltage range from 3.9 V to 200 V, offering versatile options for high-power voltage regulation needs in demanding electronic systems.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N3350B, which shares the same electrical characteristics and package type within the same product family.