1N5249B

Single Zener Diodes Overview

The Microchip Technology 1N5249B is a 0.5-watt glass axial-lead Zener diode housed in a DO-35 (DO-204AH) package. It provides a nominal Zener voltage of 19 V with a ±5% tolerance, indicated by the 'B' suffix. 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. Key electrical parameters include a test current of 6.6 mA, a maximum Zener impedance of 13.3 Ohms at 0.25 mA, and a forward voltage of 1.5 V maximum at 200 mA.

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 characteristics suitable for high-frequency applications
• Inherently radiation hard per MicroNote 050

Single Zener Diodes Applications

• Voltage regulation circuits requiring precise 19 V reference
• Protection against overvoltage transients in sensitive electronics
• Clamping applications in signal processing paths

Single Zener Diodes Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status if required by specific environmental regulations. Ensure proper handling procedures are followed during storage and installation to maintain device integrity and performance specifications.

Single Zener Diodes Selection Notes

Select this component when a 19 V Zener voltage with tight ±5% tolerance is required. Consider the DO-35 package for through-hole mounting constraints. Evaluate thermal derating requirements based on ambient temperature conditions exceeding 25°C to ensure reliable operation within the specified power dissipation limits.

Single Zener Diodes Part Context

This part belongs to the 1N5221 through 1N5281B series of 0.5 W Zener diodes. The series offers a wide selection of voltages from 2.4 V to 200 V. The 'B' suffix specifically denotes a standard 5% voltage tolerance, distinguishing it from A (10%), C (2%), and D (1%) variants within the same family.

Single Zener Diodes Replacement Considerations

Direct substitutes include Central Semiconductor Corp 1N5249B TR PBFREE. Similar alternatives from Microchip Technology include 1N5249A and 1N5539B. Verify pinout compatibility and electrical parameter alignment before implementation.

Single Zener Diodes FAQ

What does the 'B' suffix indicate for the 1N5249B?

The 'B' suffix indicates a standard voltage tolerance of plus or minus 5%.

Is the 1N5249B radiation resistant?

Yes, the device is inherently radiation hard per MicroNote 050.