1N2845RB

Overview

The 1N2845RB is a high-power Zener diode manufactured by Microchip Technology, designed for robust voltage regulation applications. It features a nominal Zener voltage of 180V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 50W and operates with a test current of 68mA. It exhibits a maximum dynamic impedance of 90 Ohms. Housed in a hermetically sealed TO-204AD (TO-3) through-hole package, it supports unidirectional operation and is RoHS compliant.

Feature Summary

• Hermetically sealed construction for enhanced reliability
• High power handling capability up to 50W
• Precision voltage regulation with 5% tolerance

Applications

• Industrial voltage regulation systems
• High-power protection circuits
• Military and aerospace electronic assemblies

Procurement Notes

Verify the specific manufacturer designation, as Central Semiconductor also produces this part number. Confirm RoHS compliance status, as some variants may differ. Ensure the TO-204AD package matches your thermal management requirements. Check for leaded vs. lead-free terminal finishes depending on assembly constraints.

Selection Notes

Select this component when high power dissipation and precise voltage reference are required in a ruggedized package. The TO-3 housing facilitates effective heat sinking for continuous 50W operation. Consider the 180V rating against system peak voltages to ensure adequate margin. Verify thermal resistance capabilities for the intended enclosure environment.

Part Context

This component belongs to the standard Zener diode family utilized in critical infrastructure and defense electronics. Microchip Technology sources these devices to meet stringent military-grade specifications. The TO-3 package remains a standard form factor for high-power discrete semiconductors requiring direct mounting to chassis heatsinks.

Replacement Considerations

The 1N2845B is a non-RoHS variant of the same electrical specification. Cross-reference with other manufacturers' 1N2845 equivalents if supply chain diversification is needed. Ensure substitute parts maintain the TO-204AD footprint and hermetic sealing requirements for compatible applications.