CDLL748

Single Zener Diodes Overview

The CDLL748 is a hermetically sealed silicon Zener diode manufactured by Microchip Technology. It features a nominal reference voltage of 3.9 V with a tolerance of 10%. The device is designed for unidirectional operation and dissipates up to 0.5 W of power. It utilizes a DO-213AA (MELF-2) glass package, specifically the LL34 form factor, which is metallurgically bonded and isolated. This component belongs to the MIL-PRF-19500/127 qualified series, ensuring reliability in demanding environments.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using metallurgically bonded glass encapsulation for environmental protection
• Qualified to MIL-PRF-19500/127 standards for high-reliability applications
• Capable of operating within an extended temperature range from -65°C to +175°C

Single Zener Diodes Applications

• Military aerospace systems requiring radiation-hardened or high-reliability components
• Spacecraft electronics subject to extreme thermal cycling
• Avionics circuits demanding strict hermetic sealing standards

Single Zener Diodes Procurement Notes

Verify that the specific order includes the E3 suffix or explicit qualification designation to confirm compliance with MIL-PRF-19500/127 requirements. Standard commercial variants may lack the necessary hermetic sealing or military-grade testing. Confirm the package type matches the required DO-213AA specification for your assembly process.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed Zener diode is mandatory for system integrity. The 3.9 V rating suits low-voltage reference needs. Ensure the PCB layout accommodates the MELF-2 footprint. Consider the 0.5 W dissipation limit during thermal design to prevent overheating in enclosed spaces.

Single Zener Diodes Part Context

This part is part of Microsemi/Microchip's line of high-reliability discrete semiconductors. It shares the same physical package and qualification class as other devices in the 1N746A through 1N759A series. These components are distinct from standard commercial diodes due to their rigorous manufacturing controls and sealed construction.

Single Zener Diodes Replacement Considerations

Direct substitutes include other MIL-PRF-19500/127 qualified Zener diodes with identical 3.9 V ratings and DO-213AA packages. Verify that any replacement maintains the hermetic seal requirement and operates within the specified -65°C to +175°C range.