1N5249A (DO-35)

Single Zener Diodes Overview

The Microsemi Corporation 1N5249A 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 19V with a standard tolerance of plus or minus 10%, indicated by the 'A' suffix. The device dissipates up to 0.5 watts at ambient temperatures below 50°C and operates within a temperature range of -65°C to +175°C. Electrical characteristics include a maximum reverse current of 6.6 μA at 10V and a Zener impedance of 13.3 Ohms at a test current of 6.6 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed glass axial-lead construction for reliable operation
• Voltage regulation maintained across broad operating current and temperature ranges
• Minimal capacitance suitable for high-frequency applications
• Inherently radiation hard per MicroNote 050

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify that the ordering prefix matches the required screening level, as military variants require specific prefixes like MQ, MX, MV, or MSP combined with the '-1' suffix. Confirm RoHS compliance status by checking for the 'e3' suffix if lead-free soldering is mandated. Ensure the base part number corresponds to the 19V specification and the 'A' suffix denotes the 10% tolerance requirement.

Single Zener Diodes Selection Notes

Select this component when a 19V breakdown voltage with 10% tolerance is required in an axial-lead package. Consider the 0.5W power dissipation limit and derating curves for thermal management. Evaluate the low capacitance characteristic against circuit frequency requirements. Verify that the operating temperature range of -65°C to +175°C meets environmental specifications.

Single Zener Diodes Part Context

This device belongs to the 1N5221 through 1N5281B series of 0.5-watt Zener voltage regulators manufactured by Microsemi's Scottsdale Division. The series offers a wide selection of voltages from 2.4 to 200 volts. Standard JEDEC registration applies to the base numbers, while tighter tolerances are available via C or D suffixes. Military screening levels are accessible through specific prefix additions.

Single Zener Diodes Replacement Considerations

Surface mount equivalents are available in the MLL5221 to MLL5281B series using the DO-213AA MELF package. Glass body axial-leaded DO-7 equivalents are also offered as alternatives. Cross-referencing requires matching the Zener voltage, power dissipation, and package style constraints.