1N5278B

Single Zener Diodes Overview

The Microchip Technology 1N5278B is a 0.5 W glass axial-lead Zener diode in the DO-35 package. It provides a nominal Zener voltage of 170 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 123 μA at 140 V. Its electrical characteristics include a test current of 0.74 mA, a maximum Zener impedance of 5500 Ω at 0.25 mA, and a voltage temperature coefficient of +0.110 %/°C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features hermetically sealed glass axial-lead construction for durability
• Inherently radiation hard per MicroNote 050
• Minimal capacitance suitable for high-frequency applications

Single Zener Diodes Applications

• Voltage reference circuits requiring high stability
• Overvoltage protection in sensitive electronic systems
• Clamping applications in signal processing paths

Single Zener Diodes Procurement Notes

Verify the specific suffix requirements against your design specifications before ordering. Confirm that the manufacturer's datasheet aligns with your thermal and electrical constraints. Ensure compatibility with existing assembly processes regarding lead-free or tin-lead finishes if applicable. Cross-reference part numbers carefully as prefixes may indicate different screening levels.

Single Zener Diodes Selection Notes

Select this component when a precise 170 V regulation point is required within a 0.5 W power budget. Consider the positive temperature coefficient for thermal compensation needs. Evaluate the high Zener impedance for impact on circuit loading. Verify that the DO-35 package dimensions fit the available PCB real estate.

Single Zener Diodes Part Context

This component belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators manufactured by Microsemi (now Microchip Technology). The series offers a wide selection of voltages from 2.4 V to 200 V in the standard DO-35 glass axial-lead package. These devices are widely used in general-purpose regulation and protection roles.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N5278B e3 for RoHS compliance. Surface mount equivalents are available in the MLL5278B MELF package. Military screening options exist with MQ, MX, MV, or MSP prefixes.