1N5261B

Single Zener Diodes Overview

The Microchip Technology 1N5261B is a silicon unidirectional Zener diode housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 47 V with a maximum power dissipation of 0.5 W at 25°C and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C, featuring a maximum reverse current of 100 µA at 36 V, a maximum Zener impedance of 105 Ω, and a positive voltage temperature coefficient of +0.095 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Regulates voltage across a broad operating current and temperature range
• Inherently radiation hard per MicroNote 050
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation circuits
• Voltage reference applications
• Protection against overvoltage conditions

Single Zener Diodes Procurement Notes

Verify the specific manufacturer origin, as this part number was originally JEDEC registered by Microsemi and is now produced by Microchip Technology. Confirm RoHS compliance status, as non-compliant versions exist alongside RoHS compliant variants identified by an 'e3' suffix. Ensure the required tolerance matches the B suffix designation before procurement.

Single Zener Diodes Selection Notes

Select this component when a stable 47 V reference is required in a through-hole design. The DO-35 package offers flexible mounting terminals suitable for general-purpose PCB layouts. Consider the positive temperature coefficient for thermal stability requirements and verify that the 0.5 W power rating accommodates the expected load current without exceeding derating limits.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. The series covers a wide selection of voltages from 2.4 V to 200 V. The 'B' suffix specifically denotes a standard voltage tolerance of plus or minus 5%, distinguishing it from other tolerance options like A (10%), C (2%), or D (1%).

Single Zener Diodes Replacement Considerations

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