1N5278BUR-1

Single Zener Diodes Overview

The Microchip Technology 1N5278BUR-1 is a metallurgically bonded glass surface mount Zener diode with a nominal voltage of 170 V and a power dissipation rating of 0.5 W. It features a hermetically sealed DO-213AA package, a maximum reverse leakage current of 5500 µA at 161.5 V, and a dynamic impedance of 1900 Ohms at the test current of 0.74 mA. The device operates within a junction temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed metallurgically bonded glass surface mount package
• Inherently radiation hard per Microsemi “MicroNote 050”
• Non-sensitive to ESD (MIL-STD-750 method 1020)
• Minimal capacitance

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• High-reliability aerospace and defense circuits requiring radiation hardness
• Surface mount equivalents for JEDEC registered axial-leaded series

Single Zener Diodes Procurement Notes

Verify the specific suffix letters on the part number to confirm the exact voltage tolerance required for the application. Confirm whether RoHS compliance is necessary, as commercial grade versions are available in compliant configurations while standard versions may not be. Ensure that the selected screening level meets the project's reliability requirements before finalizing procurement.

Single Zener Diodes Selection Notes

Select this component when a surface mount equivalent to the 1N5278B axial series is needed. Consider the high dynamic impedance and leakage current typical of higher voltage Zener diodes. Verify that the thermal resistance and derating curves support the expected ambient temperatures and power dissipation levels in the target design environment.

Single Zener Diodes Part Context

This device belongs to the 1N5221BUR-1 through 1N5281BUR-1 series, which provides surface mount equivalents to the popular JEDEC registered 1N5221 to 1N5281 series. These regulators cover a voltage range from 2.4 to 200 volts in a metallurgically bonded configuration. The series offers various voltage tolerances and optional up-screening in reference to MIL-PRF-19500.

Single Zener Diodes Replacement Considerations

The 1N5278B is the direct axial-leaded equivalent. Other series members like 1N5277BUR-1 or 1N5279BUR-1 offer different voltage ratings within the same package.