1N5256B

Single Zener Diodes Overview

The Fairchild Semiconductor 1N5256B is a single-terminal Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 30 V with a tolerance of ±5%. The device dissipates up to 500 mW of power and operates within a temperature range of -65 °C to +200 °C junction temperature. Packaged in the DO-35 axial leaded format, it utilizes a hermetically sealed glass construction. Key electrical characteristics include a test current of 4.2 mA, a maximum reverse leakage current of 100 nA, and a Zener impedance of 49 Ohms at the specified test conditions.

Single Zener Diodes Feature Summary

• Hermetically sealed glass construction ensures environmental stability
• High thermal stability with extended operating temperature range
• Low noise performance suitable for sensitive circuits

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify manufacturer authenticity as multiple vendors produce this standard part number. Confirm package type matches design requirements, as surface mount equivalents exist. Check RoHS compliance status if required by specific project regulations. Ensure storage conditions maintain the integrity of the glass encapsulation and solderable terminals.

Single Zener Diodes Selection Notes

Select this component when a through-hole axial package is mandatory for mechanical retention or existing board layout constraints. Compare against MMSZ5256B for surface mount alternatives if space optimization is needed. Verify that the 49 Ohm impedance meets circuit sensitivity requirements compared to lower impedance options.

Single Zener Diodes Part Context

This component belongs to the 1N52xx series of 500 mW Zener diodes manufactured by Fairchild Semiconductor. The series offers various voltage ratings from low to high values, all sharing similar power dissipation and package characteristics. It serves as a legacy through-hole solution often replaced by SMD variants in modern designs.

Single Zener Diodes Replacement Considerations

MMSZ5256B (SOD-123 Surface Mount)

Single Zener Diodes FAQ

What is the maximum junction temperature for the 1N5256B?

The maximum junction temperature is +200 °C.

Does the 1N5256B use a plastic or glass package?

It uses a hermetically sealed glass DO-35 package.