1N2805RB

Overview

The 1N2805RB is a high-power Zener diode manufactured by Microchip Technology, designed for robust voltage regulation applications. It features a nominal Zener voltage of 7.5 V with a maximum power dissipation rating of 50 W. The device utilizes silicon as the semiconductor material and is housed in a TO-204AD (TO-3) package, which supports through-hole mounting. It operates within an extended temperature range from -65 °C to +175 °C. Key electrical characteristics include a maximum dynamic impedance of 0.3 Ω and a reverse leakage current of 100 µA at 5 V. The component is unidirectional and hermetically sealed.

Feature Summary

• Provides stable voltage regulation across a broad range of voltages up to 50 W with adequate heat sinking.
• Features low thermal resistance enabling operation at high power levels.
• Constructed with silicon elements for reliable performance in demanding environments.
• Hermetically sealed construction ensures durability and protection against environmental factors.

Applications

• High-power voltage regulation circuits
• Industrial equipment requiring robust overvoltage protection
• Military and aerospace systems utilizing qualified components
• Power supplies needing stable reference voltages

Procurement Notes

Verify the specific suffix RB indicates the correct tolerance or qualification level required for your design, as variations exist within the 1N2805 series. Confirm RoHS compliance status if restricted substances are prohibited in your manufacturing process. Ensure the TO-3 package dimensions match your PCB footprint or chassis mounting constraints. Check for military qualifications like JAN or JANTXV if operating in harsh environments. Validate that the supplier provides genuine Microchip Technology products to avoid counterfeit risks.

Selection Notes

Select this component when a 7.5 V regulation point is needed with significant power handling capabilities. The TO-3 package is suitable for applications where large heat sinks can be attached directly to the case. Consider the 0.3 Ω dynamic impedance for stability requirements. Compare with other 1N2805 variants if different tolerances or packaging options are preferred. Ensure the system can dissipate the full 50 W heat load under worst-case conditions.

Part Context

This part belongs to the 1N2805 series of 50 Watt Zener diodes offered by Microchip Technology. The series covers a wide voltage range from 3.9 V to 200 V. These diodes are often used in critical infrastructure and defense applications due to their high power density and reliability. The TO-204AD package is a standard industry form factor for high-power discrete semiconductors.

Replacement Considerations

The 1N2805B is listed as a parameter-equivalent alternative. Verify that the B variant meets all electrical and mechanical specifications before substitution. Ensure any replacement maintains the same TO-3 package and pinout configuration.