SG1845J-DESC

Overview

The SG1845J-DESC is a high-reliability, current-mode PWM switching controller manufactured by Microchip Technology. Designed for isolated switching regulators, it supports both step-up and step-down topologies with an integrated transistor driver and synchronous rectification capabilities. The device operates within a supply voltage range of 7.6V to 30V and features a maximum switching frequency of 500kHz. It is housed in a 14-pin ceramic DIP package (CDIP) or a 10-pin flatpack variant, ensuring robust performance across extreme temperatures from -55°C to 125°C.

Feature Summary

• Supports boost and buck topologies with isolated output configurations
• Integrates a transistor driver and synchronous rectification for improved efficiency
• High-reliability construction suitable for military and aerospace applications

Applications

• Isolated switching power supplies
• Solar inverters
• Military-grade DC-DC converters

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm package type and temperature grade. Ensure the ordering part number matches the required isolation and reliability standards. Confirm availability through authorized channels as this component may be subject to special order requirements.

Selection Notes

Select this component when designing high-reliability isolated power systems requiring current-mode control. Consider the 14-pin CDIP package for through-hole mounting or the 10-pin DFP for compact layouts. Verify that the input voltage range and thermal specifications align with the target application environment.

Part Context

This part belongs to Microchip's high-reliability switching controller series, often associated with MIL-STD-883 compliance. It serves as a specialized solution for ruggedized electronics where standard commercial components do not meet durability or performance criteria.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided data.