1N5226B

Single Zener Diodes Overview

The 1N5226B is a unidirectional silicon Zener voltage regulator diode manufactured by SMC Diode Solutions. It features a nominal Zener voltage of 3.3 V with a maximum power dissipation of 0.5 W (500 mW). The device utilizes a DO-35 glass axial leaded package and operates within a junction temperature range of -55°C to +175°C. Key electrical characteristics include a maximum reverse leakage current of 25 µA, a Zener impedance of 28 Ω at a test current of 20 mA, and a forward voltage drop of 1.1 V. The component exhibits a negative voltage temperature coefficient of -0.07 %/°C and maintains a 5% voltage tolerance.

Single Zener Diodes Feature Summary

• Utilizes a glass passivated junction structure for enhanced stability and reliability under high-temperature conditions.
• Provides precise voltage regulation through low dynamic Zener impedance characteristics.
• Features isolated case construction suitable for direct circuit mounting without grounding constraints.

Single Zener Diodes Applications

• Voltage reference circuits requiring stable low-voltage biasing.
• Overvoltage protection stages in signal conditioning paths.
• Clamping applications in DC power supply outputs.

Single Zener Diodes Procurement Notes

Verify the manufacturer designation on the component marking or datasheet, as the 1N5226B is a standardized JEDEC part number produced by multiple vendors including Vishay, Microchip, and Motorola. Confirm that the specific batch from SMC Diode Solutions matches the required RoHS compliance status and package variant (DO-35) for your assembly process. Ensure the thermal management design accommodates the 0.5 W power rating at the intended operating ambient temperature.

Single Zener Diodes Selection Notes

Select this component when a standard 3.3 V reference is needed in an axial through-hole configuration. The DO-35 package offers a balance between power handling and board space efficiency compared to larger packages. Consider the negative temperature coefficient when designing circuits sensitive to thermal drift, as the voltage will decrease slightly as temperature rises above room temperature.

Single Zener Diodes Part Context

This device belongs to the 1N52xx series of Zener diodes, which are widely used for general-purpose voltage regulation. The 1N5226B specifically targets the lower end of the Zener voltage spectrum where avalanche breakdown mechanisms dominate, resulting in the observed negative temperature coefficient behavior typical for voltages below approximately 5 V.

Single Zener Diodes Replacement Considerations

Direct functional substitutes include the 1N5226B/TAP and 1N5226B/D8 variants from Vishay Semiconductors, which share identical electrical specifications and DO-35 packaging. Other manufacturers such as Microchip Technology and NXP also produce equivalent parts under the same JEDEC designation.