1N5228B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5228B is a silicon Zener diode with a nominal voltage of 3.9 V and a standard tolerance of ±5%. It operates in the DO-35 (DO-204AH) glass axial-lead package, providing a maximum power dissipation of 0.5 watts at 25°C. The device features a test current of 20 mA and a maximum reverse current of 10 µA at 1.0 V. Its electrical characteristics include a maximum Zener impedance of 23 Ohms at 0.25 mA and a temperature coefficient of -0.060 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Inherently radiation hard design suitable for harsh environments
• Non-sensitive to electrostatic discharge per MIL-STD-750 Method 1020
• Minimal capacitance characteristics across operating ranges

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in electronic circuits
• Protection against voltage transients in sensitive components

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required JEDEC registration and tolerance suffix. Confirm compliance requirements such as RoHS status if applicable, noting that standard versions may differ from e3 suffix variants. Ensure the supplier provides documentation confirming the hermetic seal integrity and adherence to the specified thermal resistance parameters for your mounting configuration.

Single Zener Diodes Selection Notes

Select this component when a precise 3.9 V reference is needed within a standard axial-lead footprint. Consider the negative temperature coefficient for thermal stability analysis in your circuit design. Evaluate the 0.5 W power rating against expected load currents and ambient temperatures to ensure adequate derating margins are maintained during steady-state operation.

Single Zener Diodes Part Context

This device belongs to the popular 1N5221 through 1N5281B series of 0.5 watt Zener Voltage Regulators. The series offers a wide selection of voltages ranging from 2.4 to 200 volts. Variants are available with different tolerances and screening levels, including military specifications via prefix identifiers.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF style package. Other manufacturers producing JEDEC registered 1N5228B devices may serve as functional substitutes provided pinout and electrical limits align.