1N2805B

Overview

The Microchip Technology 1N2805B is a high-power 50 W Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 7.5 V with a tolerance of ±10%. The device is housed in a TO-204AD (TO-3) through-hole package, suitable for robust industrial environments. Key electrical characteristics include a maximum dynamic impedance of 0.3 Ohms and a forward voltage of 1.5 V at 10 A. It operates within a temperature range of -65°C to 175°C and exhibits a reverse leakage current of 100 µA at 5 V.

Feature Summary

• Provides stable voltage regulation in high-power circuits up to 50 W
• Capable of operating in extreme temperatures ranging from -65°C to 175°C
• Features low dynamic impedance for effective noise suppression

Applications

• High-power voltage regulation circuits
• Industrial power supply protection
• Overvoltage protection systems

Procurement Notes

Verify the specific suffix 'B' indicates the required tolerance level, as variations exist within the series. Confirm RoHS compliance status, as commercial versions may differ from qualified levels. Ensure the TO-204AD package dimensions match the target PCB footprint. Cross-reference datasheet revisions to confirm thermal resistance values for heat sink selection.

Selection Notes

Select this component when a 7.5 V reference with high power dissipation capability is required. The TO-3 package allows for direct mounting to heatsinks, simplifying thermal management compared to smaller packages. Consider the ±10% tolerance if tighter regulation is not critical. Evaluate the 175°C junction temperature rating against the ambient environment requirements.

Part Context

The 1N2805B belongs to the 1N2804B–1N2846B series of 50 Watt Zener diodes manufactured by Microchip Technology. This series is JEDEC registered and provides a wide range of voltage values from 3.9 V to 200 V. The 'B' suffix typically denotes a specific tolerance grade within the product family, distinguishing it from other variants like the 1N2805A or 1N2805RB.

Replacement Considerations

• 1N2805A
• 1N2805RB