1N5226B/TR

Single Zener Diodes Overview

The Microchip Technology 1N5226B/TR is a unidirectional silicon Zener voltage regulator diode housed in a glass axial-lead DO-35 package. It provides a nominal Zener voltage of 3.3 V with a standard tolerance of ±5% (indicated by the B suffix). The device operates at a test current of 20 mA and dissipates up to 0.5 W at 25°C. Key electrical parameters include a maximum reverse leakage current of 25 µA, a Zener impedance of 28 Ω, and a forward voltage of 1.1 V. It features a negative temperature coefficient of -0.07 %/°C and functions within an operating temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features minimal capacitance for high-frequency applications
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection
• Clamping applications

Single Zener Diodes Procurement Notes

Verify that the ordering suffix 'TR' corresponds to tape and reel packaging as specified in the datasheet. Confirm RoHS compliance status via the 'e3' designation if applicable to your specific procurement batch. Ensure the component meets JEDEC registration standards for the 1N5221 through 1N5281B series before integration into production.

Single Zener Diodes Selection Notes

Select this component when a 3.3 V regulation point is required with ±5% tolerance. The DO-35 package suits through-hole mounting requirements. Consider the -0.07 %/°C temperature coefficient for thermal stability needs. Verify that the 0.5 W power dissipation rating aligns with the thermal design of the target circuit board.

Single Zener Diodes Part Context

This part belongs to the widely used 1N5221 through 1N5281B series of 0.5 W Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a voltage selection from 2.4 V to 200 V in standard DO-35 glass packages. The 1N5226B specifically targets low-voltage regulation applications requiring tight tolerance and reliable performance in harsh environments.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package. For military screening levels, prefixes such as MQ, MX, MV, or MSP can be added to variants with the '-1' suffix.

Single Zener Diodes FAQ

What does the 'TR' suffix indicate for this part number?

The 'TR' suffix indicates that the device is supplied in tape and reel packaging, conforming to EIA-296 standards.

How is the polarity identified on the 1N5226B?

The cathode is indicated by a band on the glass body. The diode must be operated with the banded end positive with respect to the opposite end for Zener regulation.