1N5253B (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5253B is a silicon Zener diode housed in a hermetically sealed glass DO-35 (DO-204AH) axial-lead package. It provides a nominal Zener voltage of 25 V with a standard tolerance of ±5%. The device operates at a test current of 5.0 mA and dissipates up to 0.5 watts at 25°C. Maximum reverse current is specified at 600 μA, while the maximum Zener impedance is 35 Ω. The component exhibits a positive temperature coefficient of +0.089 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for environmental stability
• Standardized JEDEC registration ensuring broad compatibility
• Positive temperature coefficient suitable for stable regulation above 5V

Single Zener Diodes Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection for sensitive electronic components
• Clamping applications in signal processing paths

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required suffix configuration. Confirm compliance with RoHS standards if applicable by checking for the e3 designation. Ensure the procurement documentation specifies the correct tolerance level and screening requirements for the intended application environment.

Single Zener Diodes Selection Notes

Select this component when a precise 25 V regulation point is required within a low-power circuit. Consider the thermal resistance characteristics and derating curves for high-temperature environments. Evaluate the package size constraints against available board space for axial-leaded mounting.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. The series offers a wide selection of voltages from 2.4 to 200 volts. Variants are available with different tolerances and military screening prefixes.

Single Zener Diodes Replacement Considerations

Equivalent parts include the 1N5253B from other manufacturers such as Sensitron or Hitachi/Renesas. Verify pinout orientation and physical dimensions before substitution.

Single Zener Diodes FAQ

What is the polarity marking on the DO-35 package?

The cathode is indicated by a band on the glass body. For Zener regulation, the banded end must be connected to the positive potential relative to the opposite end.

How does the temperature coefficient affect operation?

The 1N5253B has a positive temperature coefficient of +0.089 %/°C, meaning the breakdown voltage increases slightly as temperature rises.