1N2835B

Overview

The Microchip Technology 1N2835B is a high-power silicon Zener diode designed for robust voltage regulation applications. It features a nominal Zener voltage of 75 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 50 W and operates within an extended temperature range from -65°C to +175°C. Packaged in the hermetically sealed TO-204AD (TO-3) through-hole format, it exhibits a maximum impedance of 9 Ohms and a forward voltage of 1.5 V at 10 A. This component belongs to the MIL-PRF-19500/114 qualified series, ensuring reliability in demanding environments.

Feature Summary

• Provides stable voltage regulation across a broad range using high-power 50W Zener technology.
• Features a hermetically sealed metal case construction suitable for harsh environmental conditions.
• Supports operation up to 50W with adequate mounting and heat sinking provisions.

Applications

• High-power voltage regulation circuits requiring military-grade reliability.
• Industrial equipment operating in extreme temperature environments.
• Aerospace and defense electronic systems utilizing JAN, JANTX, or JANTXV qualified components.

Procurement Notes

Verify that the specific order includes the required qualification level, as commercial versions lack the MIL-PRF-19500/114 certification. Confirm package integrity upon receipt, as the TO-204AD housing is critical for thermal management and hermetic sealing. Ensure compatibility with existing board layouts for the TO-3 form factor before finalizing procurement decisions.

Selection Notes

Select this component when a 75V regulation point is required with significant power handling capabilities. The wide operating temperature range makes it suitable for applications where standard commercial diodes would fail. Consider the physical size of the TO-3 package and the need for appropriate heatsinking to manage the 50W power dissipation effectively during design integration.

Part Context

The 1N2835B is part of the 1N2804B through 1N2846B series of 50 Watt Zener diodes manufactured by Microchip Technology. This family offers voltage regulation values ranging from 3.9 V to 200 V. The series is JEDEC registered and available in various qualification levels, including JAN, JANTX, and JANTXV, catering to diverse industrial and military specifications.

Replacement Considerations

Direct substitutes within the same series include other 1N28xxB variants with different Zener voltages but identical power and package specifications. Cross-referencing with equivalent MIL-spec parts from other manufacturers requires verification of pinout compatibility and thermal resistance characteristics.