1N5281B/TR

Single Zener Diodes Overview

The Microchip Technology 1N5281B/TR is a silicon Zener diode with a nominal voltage of 200V and a 5% tolerance. It operates in the DO-35 glass axial-lead package, rated for 0.48W steady-state power dissipation at 25°C ambient temperature. The device supports an operating temperature range from -65°C to +175°C. Electrical characteristics include a maximum reverse current of 1 µA at 144V and a maximum Zener impedance of 10 Ohms at a test current of 10 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction
• Inherently radiation hard per MicroNote 050
• Minimal capacitance across the voltage range
• ESD non-sensitive per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• Voltage regulation over broad operating currents
• Reference voltage generation in harsh environments
• Overvoltage protection circuits

Single Zener Diodes Procurement Notes

Verify that the part number includes the TR suffix to confirm tape and reel packaging compliance with EIA-296 standards. Ensure the B suffix is present to guarantee the specified 5% voltage tolerance. Confirm RoHS compliance by checking for the e3 designation if required by assembly specifications.

Single Zener Diodes Selection Notes

Select this component when high-voltage regulation up to 200V is required within a standard axial-lead footprint. The B suffix ensures tighter manufacturing tolerances compared to the A suffix variant. Consider the thermal resistance limits and derating curves for applications involving elevated ambient temperatures or restricted airflow conditions.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5-watt Zener Voltage Regulators manufactured by Microsemi Scottsdale Division. The series provides a wide selection of voltages from 2.4V to 200V in the DO-35 package. Surface mount equivalents are available in the MLL5221 to MLL5281B MELF style packages.

Single Zener Diodes Replacement Considerations

MLL5281B (DO-213AA MELF)

Single Zener Diodes FAQ

How is polarity indicated on the 1N5281B?

Polarity is indicated by a band on the cathode end. For Zener regulation, the banded end must be operated positive with respect to the opposite end.

What is the maximum forward voltage?

The maximum forward voltage is 1.5 volts at a forward current of 200 mA.