1N5245B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5245B is a silicon unidirectional Zener voltage regulator diode housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 15 V with a standard tolerance of ±5% for the B suffix. The device dissipates up to 0.5 watts at 25°C and operates within a temperature range of -65°C to +175°C. Key electrical parameters include a maximum reverse current of 10 μA, a Zener impedance of 16 Ohms at IZK = 0.25 mA, and a positive voltage temperature coefficient of +0.082 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction
• Regulates voltage across broad operating currents and temperatures
• Inherently radiation hard per MicroNote 050
• Minimal capacitance characteristics

Single Zener Diodes Applications

• Voltage regulation circuits
• Reference voltage generation
• Protection against overvoltage transients

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix to confirm compliance requirements. The 'e3' suffix indicates RoHS compliant devices with matte-tin plating. Prefixes such as MQ, MX, MV, or MSP denote military screening levels under MIL-PRF-19500. Confirm lead length specifications during soldering to maintain thermal ratings.

Single Zener Diodes Selection Notes

Select this component for applications requiring stable voltage reference in harsh environments due to its radiation hardness and wide temperature range. Ensure the power dissipation does not exceed 0.5 watts without applying derating curves based on ambient temperature. Verify that the required voltage tolerance aligns with the standard B suffix availability.

Single Zener Diodes Part Context

This part belongs to the popular 1N5221 through 1N5281B series of 0.5-watt Zener Voltage Regulators. The series offers a selection from 2.4 to 200 volts with various tolerance options identified by suffix letters. These components are JEDEC registered and widely used in general-purpose electronic designs requiring reliable voltage clamping.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF style package. Other manufacturers may offer generic DO-35 Zener diodes with similar 15V ratings, but verify exact impedance and leakage specifications for critical circuit performance.

Single Zener Diodes FAQ

What is the voltage temperature coefficient for the 1N5245B?

The voltage temperature coefficient is +0.082 %/°C.

How is polarity indicated on the device?

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