1N5249A

Single Zener Diodes Overview

The Microchip Technology 1N5249A is a 0.5 W glass axial-lead Zener diode in the DO-35 package. It provides a nominal Zener voltage of 19 V with a ±10% tolerance (suffix A). The device operates within a temperature range of -65°C to +175°C and features a maximum reverse current of 100 µA at 14 V. Electrical characteristics include a test current of 6.6 mA, a maximum Zener impedance of 23 Ω at 0.25 mA, and a voltage temperature coefficient of +0.086 %/°C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Features hermetically sealed glass axial-lead construction for durability
• Offers minimal capacitance suitable for high-frequency applications
• Inherently radiation hard per MicroNote 050

Single Zener Diodes Applications

• Voltage reference circuits
• Overvoltage protection
• Power supply regulation

Single Zener Diodes Procurement Notes

Verify that the component matches the specific JEDEC registered type number and suffix requirements. Confirm the manufacturer origin, as this series was originally produced by Microsemi Scottsdale Division. Ensure the part meets RoHS compliance if required by checking for the e3 suffix designation on the ordering information.

Single Zener Diodes Selection Notes

Select this component when a 19 V Zener voltage with 10% tolerance is required in a standard DO-35 package. Consider the positive temperature coefficient for thermal stability needs. Evaluate the power derating curve for operation above 25°C ambient temperature to ensure safe dissipation limits are maintained.

Single Zener Diodes Part Context

This part belongs to the 1N5221 through 1N5281B series of 0.5 W Zener Voltage Regulators. The series offers a wide selection from 2.4 to 200 volts with various tolerance options identified by suffix letters. These devices are designed for general-purpose voltage regulation tasks requiring reliable performance in axial-lead configurations.

Single Zener Diodes Replacement Considerations

Direct substitutes include the 1N5249B for tighter 5% tolerance or the 1N5249 without suffix for standard tolerances. Other manufacturers may offer equivalent specifications, but verify pinout compatibility and thermal resistance values before implementation.