1N5226B

Single Zener Diodes Overview

The Fairchild Semiconductor 1N5226B is a unidirectional silicon Zener voltage regulator diode housed in a DO-35 glass axial leaded package. It provides a nominal Zener voltage of 3.3 V with a maximum power dissipation of 0.5 W (500 mW). The device features a tight voltage tolerance of ±5% and operates within an ambient temperature range from -65°C to +200°C. Key electrical characteristics include a maximum reverse leakage current of 25 µA, a Zener impedance of 28 Ohms at a test current of 20 mA, and a forward voltage of 1.1 V. The component is RoHS compliant and halogen-free.

Single Zener Diodes Feature Summary

• Glass passivated junction for high reliability
• Low Zener impedance for stable regulation
• High temperature soldering capability

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection
• Clipper and clamper circuits

Single Zener Diodes Procurement Notes

Verify the manufacturer origin carefully, as the 1N5226B designation is widely used by multiple vendors including Vishay, Microchip, and others. Confirm that the specific unit matches the DO-35 glass axial package and 3.3V specification. Ensure compliance requirements such as RoHS status align with project needs, as legacy versions may differ.

Single Zener Diodes Selection Notes

Select this component when a standard 3.3 V reference is required in a through-hole axial configuration. The DO-35 package offers robust mechanical stability for general-purpose applications. Consider the 5% tolerance and 28 Ohm impedance for precision requirements. Verify thermal derating curves if operating near the maximum power limit.

Single Zener Diodes Part Context

This part belongs to the standard 1N52xx series of 0.5 W Zener diodes, which covers a wide voltage range from 2.4 V to higher values. The 'B' suffix typically denotes a tighter 5% voltage tolerance compared to standard variants. The series is a long-standing industry standard for low-power voltage regulation.

Single Zener Diodes Replacement Considerations

Direct substitutes include Vishay 1N5226B, Microchip 1N5226B, and Semtech 1N5226B. Cross-referencing datasheets is essential to confirm identical pinout, voltage tolerance, and package dimensions.