1N5254B

Single Zener Diodes Overview

The Microchip Technology 1N5254B is a 0.5-watt glass axial-lead Zener voltage regulator housed in a DO-35 package. It provides a nominal Zener voltage of 27 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse current of 100 µA at 21 V. Electrical characteristics include a test current of 4.6 mA, a maximum Zener impedance of 41 Ohms, and a voltage temperature coefficient of +0.090 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for environmental stability
• Regulates voltage across a broad operating current and temperature range
• Minimal capacitance characteristics suitable for high-frequency applications
• Inherently radiation hard per MicroNote 050

Single Zener Diodes Applications

• Voltage regulation in electronic circuits
• Reference voltage sources
• Overvoltage protection

Single Zener Diodes Procurement Notes

Verify the specific suffix 'B' indicates the required ±5% tolerance during procurement. Confirm that the component meets RoHS compliance requirements if applicable by checking for the 'e3' suffix. Ensure the ordering documentation specifies the JEDEC registered type number for accurate electrical parameter validation against datasheet specifications.

Single Zener Diodes Selection Notes

Select this component when a precise 27 V reference with tight ±5% tolerance is required. Consider the DO-35 package dimensions for through-hole mounting constraints. Evaluate the thermal resistance of 250 °C/W and power derating curves to ensure operation remains within the 0.5 W dissipation limit under expected ambient conditions.

Single Zener Diodes Part Context

This part belongs to the 1N5221 through 1N5281B series of 0.5-watt Zener diodes. The series offers a wide selection of voltages from 2.4 V to 200 V. Variations in the part number suffix denote different tolerance levels, such as 'A' for ±10% or 'B' for ±5%, allowing designers to choose components based on circuit precision requirements.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package. These variants provide similar electrical performance in a compact form factor while maintaining compatibility with the original series specifications.

Single Zener Diodes FAQ

What is the maximum Zener impedance for the 1N5254B?

The maximum Zener impedance (ZZT) for the 1N5254B is 41 Ohms, measured at the specified test current.

How does the 'B' suffix affect the component's specifications?

The 'B' suffix identifies the device as having a standard voltage tolerance of ±5%, compared to the ±10% tolerance associated with the 'A' suffix.