1N3009B

Overview

The 1N3009B is a hermetically sealed silicon Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 75V with a 5% tolerance and a maximum power dissipation of 50W. The device utilizes a DO-203AA (DO-4) glass axial leaded package designed for through-hole mounting. Key electrical characteristics include a maximum reverse leakage current of 10µA at the rated voltage and a maximum dynamic impedance of 1.8Ω. It operates within a temperature range of -65°C to +175°C, ensuring reliability in demanding environments.

Feature Summary

• Hermetically sealed construction using glass encapsulation for environmental protection
• High power handling capability suitable for robust voltage regulation applications
• Wide operating temperature range supporting extreme thermal conditions

Applications

• Military aerospace power supply regulation
• High-reliability industrial voltage reference circuits
• Harsh environment overvoltage protection systems

Procurement Notes

Verify the specific suffix designation against official Microchip documentation to confirm exact electrical tolerances and testing requirements. Ensure procurement channels provide traceability certificates required for qualified components. Confirm package integrity upon receipt to maintain hermetic seal standards mandated for this component class.

Selection Notes

Select this component when high power dissipation and strict environmental sealing are required. Compare dynamic impedance and leakage specifications against circuit requirements. Verify that the DO-4 package dimensions fit the target PCB layout. Consider thermal management strategies due to the significant power rating associated with this package style.

Part Context

This part belongs to the standard Zener diode family produced by Microchip Technology. It shares the DO-203AA physical form factor with other high-power variants in the series. The product line focuses on providing stable voltage references for critical systems where standard plastic packages are insufficient.

Replacement Considerations

Consult official cross-reference guides for equivalent parts from other manufacturers. Verify that any substitute matches the 50W power rating, 75V Zener voltage, and hermetic sealing requirements. Ensure the replacement maintains the same DO-203AA footprint and pin configuration.