1N5247A (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5247A (DO-35) is a silicon Zener diode with a nominal voltage of 17 V and a tolerance of ±10%. It operates in the DO-35 glass axial-lead package, dissipating up to 0.5 W at 25°C. The device features a maximum reverse current of 600 μA at 12 V and a zener impedance of 12 Ω at 0.25 mA. It withstands operating temperatures from -65°C to +175°C and has a positive temperature coefficient of +0.084 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Capable of regulating voltage across a broad operating current range
• Inherently radiation hard per MicroNote 050
• Minimal capacitance characteristics suitable for high-frequency applications

Single Zener Diodes Applications

• Voltage regulation in power supply circuits
• Overvoltage protection for sensitive electronic components
• Reference voltage generation in measurement equipment

Single Zener Diodes Procurement Notes

Verify that the part number includes the correct suffix 'A' to confirm the 10% voltage tolerance specification. Ensure the package designation matches the required DO-35 form factor for your circuit board layout. Confirm RoHS compliance status if environmental regulations apply to your manufacturing process. Check for any prefix identifiers if military screening levels are required for your specific application environment.

Single Zener Diodes Selection Notes

Select this component when a stable 17 V reference is needed within a standard axial-lead footprint. Consider the ±10% tolerance if tighter precision is not critical. Evaluate the thermal derating requirements if the ambient temperature exceeds 25°C or if continuous full-power dissipation is necessary. Compare against other series members if different voltage levels or tighter tolerances like the B suffix are more appropriate.

Single Zener Diodes Part Context

This device belongs to the popular 1N5221 through 1N5281B series of 0.5 watt Zener Voltage Regulators produced by Microsemi's Scottsdale Division. The series provides a wide selection of voltages ranging from 2.4 to 200 volts. These components are JEDEC registered and widely used in general-purpose electronics requiring reliable voltage clamping or regulation.

Single Zener Diodes Replacement Considerations

Equivalent parts include the MSP1N5247A-1 for hermetic sealing options or the 1N5247DB for non-hermetic variants. Verify pinout compatibility and ensure the replacement meets the same 0.5 W power dissipation rating and DO-35 package dimensions.

Single Zener Diodes FAQ

What is the temperature coefficient for the 1N5247A?

The maximum zener voltage temperature coefficient is +0.084 %/°C.

How is polarity indicated on the DO-35 package?

Polarity is indicated by a band on the glass body; the banded end represents the cathode.