1N4556A

Single Zener Diodes Overview

The Microchip Technology 1N4556A is a high-power 50 W Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 7.5 V with a tolerance of ±10%. The device operates within a junction and storage temperature range of -65°C to +175°C. Key electrical characteristics include a maximum dynamic impedance (Zzt) of 0.24 Ohms at the test current (Izt) of 1,650 mA, and a maximum reverse current (Ir) of 10 µA at 3.0 V. The component utilizes a DO-5 (DO-203AB) package with an 11/16 inch hexagonal stud.

Single Zener Diodes Feature Summary

• Hermetically sealed welded construction with internal solder bond design
• Inherently radiation hard and non-sensitive to electrostatic discharge
• Standard polarity configuration connects the anode directly to the case

Single Zener Diodes Applications

• Voltage regulation in power supplies requiring broad operating current ranges
• High-power circuit protection utilizing adequate mounting and heat sinking
• Military and aerospace systems requiring MIL-PRF-19500/358 qualified components

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required tolerance suffix, as 'A' denotes ±10% while 'B' indicates ±5%. Confirm polarity requirements, noting that standard units have the anode connected to the case, whereas reverse polarity requires an 'R' suffix. Ensure procurement specifications account for the hermetically sealed metal and glass construction suitable for harsh environments.

Single Zener Diodes Selection Notes

Select this component when applications demand high power dissipation capabilities up to 50 watts with low thermal resistance. The DO-5 package facilitates direct mounting to heatsinks via the hexagonal stud. Consider the wide operating temperature range and radiation hardness for specialized industrial or defense environments where standard commercial packages may fail.

Single Zener Diodes Part Context

This component belongs to the 1N4549 through 1N4556 series of 50 Watt Zener diodes manufactured by Microchip Technology's Scottsdale Division. These devices are JEDEC registered equivalents to the 1N3305 through 1N3350B series. The series provides a broad selection of voltages ranging from 3.9 V to 200 V, catering to various high-power voltage regulation needs.

Single Zener Diodes Replacement Considerations

Direct replacements include the 1N3306B, which shares identical electrical characteristics and physical form factor. Other compatible parts within the same series offering similar performance profiles are the 1N4555B and 1N3306.