JAN1N978BUR-1

Single Zener Diodes Overview

The JAN1N978BUR-1 is a silicon MELF Zener diode with a nominal voltage of 51 V and a test current of 2.5 mA. It operates within a temperature range of -65°C to +175°C and features a maximum steady-state power dissipation of 0.5 W at an end cap temperature of +125°C. The device exhibits a maximum dynamic impedance of 125 Ohms, a maximum reverse leakage current of 0.5 µA at 39 V, and a maximum temperature coefficient of +0.096 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass case package with internal metallurgical bond
• Qualified per MIL-PRF-19500/117 for military reliability levels
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• High density surface mount mounting applications
• General circuit protection in harsh environments

Single Zener Diodes Procurement Notes

Verify the specific part number against official Microchip documentation to confirm the exact qualification level and tolerance suffix. Ensure that the ordering information matches the required military grade specifications and RoHS compliance status before procurement.

Single Zener Diodes Selection Notes

Select this component when a 51 V reference is required in a surface mount MELF package. Consider the thermal resistance values and derating curves for high-temperature environments. Verify compatibility with the target PCB material regarding the axial coefficient of expansion.

Single Zener Diodes Part Context

This component belongs to the 1N957BUR-1 through 1N992BUR-1 series of 0.5 watt Zener voltage regulators. The series provides a wide selection of voltages from 6.8 to 200 volts in standard DO-213AA (MELF) packages.

Single Zener Diodes Replacement Considerations

JAN1N978BUR-1

Single Zener Diodes FAQ

What is the polarity marking on the device?

The cathode end is identified by a band.

How is the Zener voltage measured?

It is measured after the test current has been applied for 20 ± 5 seconds, with mounting clips maintained at 25 ± 8/-2 °C.