1N2845B

Overview

The Microchip Technology 1N2845B is a single silicon Zener diode designed for high-power voltage regulation applications. It features a nominal Zener voltage of 180V with a tolerance of ±5% and a maximum power dissipation rating of 50W. The device utilizes a TO-204AD (TO-3) through-hole package, where the case is electrically connected to the cathode terminal. It supports a maximum operating temperature of 175°C and exhibits a maximum dynamic impedance of 90 Ω.

Feature Summary

• High power handling capability with a 50W dissipation rating for robust voltage regulation
• Robust TO-3 through-hole construction with an electrically isolated case connection to the cathode
• Silicon unidirectional junction design ensuring stable performance under specified thermal conditions

Applications

• High-voltage power supply regulation circuits
• Overvoltage protection stages in industrial equipment
• Voltage reference components in precision measurement instrumentation

Procurement Notes

Verify manufacturer origin as production may be sourced from Microchip or legacy entities like Microsemi. Confirm RoHS compliance status, as historical data indicates non-compliance for some variants. Ensure the TO-3 package pinout matches the specific application board layout requirements before integration.

Selection Notes

Select this component when a high-voltage, high-power Zener solution is required in a through-hole format. The 180V breakdown voltage suits applications needing precise regulation above standard low-voltage ranges. Consider the TO-3 package size and mounting requirements for thermal management in the final enclosure design.

Part Context

This component belongs to the family of general-purpose silicon Zener diodes manufactured by Microchip Technology. It serves as a discrete semiconductor device within the broader category of power management and protection components, offering a reliable alternative to integrated solutions for high-energy clamping tasks.

Replacement Considerations

Cross-reference with other 1N2845B equivalents from different manufacturers such as Central Semiconductor. Verify that substitute parts maintain the identical 180V Zener voltage, 50W power rating, and TO-3 package dimensions to ensure mechanical and electrical compatibility.