1N5251B

Single Zener Diodes Overview

The 1N5251B is a single silicon Zener diode manufactured by SMC Diode Solutions, designed for voltage regulation and reference applications. It features a nominal Zener voltage of 22 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 500 mW at ambient temperature. It utilizes a DO-35 axial through-hole package, suitable for standard PCB mounting. Key electrical characteristics include a maximum reverse leakage current of 100 nA and a dynamic impedance of 29 Ohms at the test current of 5.6 mA. The component operates within a junction temperature range of -55°C to +150°C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation using a single PN junction structure in a glass-encapsulated axial leaded package.
• Offers precise voltage tolerance of ±5% for accurate reference applications.
• Features low reverse leakage current to minimize standby power consumption.
• Designed for reliable operation across a wide industrial temperature range.

Single Zener Diodes Applications

• Voltage regulation in DC power supply circuits
• Voltage reference sources for analog signal processing
• Overvoltage protection for sensitive electronic components

Single Zener Diodes Procurement Notes

Verify the manufacturer designation on the component body, as the 1N5251B part number is utilized by multiple semiconductor producers including SMC Diode Solutions, Microchip, and Central Semiconductor. Confirm that the specific datasheet aligns with the required electrical parameters, particularly the dynamic impedance and leakage current specifications, which may vary between manufacturers despite sharing the same JEDEC case outline.

Single Zener Diodes Selection Notes

Select this component when a 22 V regulated voltage is required in a through-hole assembly environment. Ensure the circuit design accounts for the 500 mW power dissipation limit and the thermal derating requirements above 50°C. Verify that the ±5% voltage tolerance meets the system's accuracy constraints. Consider the 29 Ohm dynamic impedance if line regulation performance is critical for the application.

Single Zener Diodes Part Context

The 1N5251B belongs to the standard 1N52xx series of 0.5 W Zener diodes, a widely recognized industry family for general-purpose voltage regulation. This series typically spans from 2.4 V to 200 V, offering various tolerance options. The DO-35 package is a legacy form factor still prevalent in prototyping and industrial equipment requiring robust axial leads.

Single Zener Diodes Replacement Considerations

Cross-reference with other manufacturers' 1N5251B parts such as those from Microchip or Central Semiconductor. Ensure mechanical compatibility with the DO-35 footprint and verify that electrical parameters like Zener impedance and leakage current fall within acceptable limits for the specific circuit design.