SG1845J

Overview

The SG1845J is a high-reliability current-mode PWM switching controller designed for isolated flyback regulators. It operates within a frequency range of 100 Hz to 500 kHz and supports a maximum output current of 1 A. The device features a ceramic flatpack (CDFP-10) package with 10 terminals. It functions with input voltages between 12 V and 25 V, typically at 15 V. Operating temperatures span from -55°C to +125°C, ensuring robust performance in demanding environments.

Feature Summary

• Current-mode pulse width modulation control for precise regulation
• High-reliability construction suitable for critical applications
• Flyback topology support for isolated switching regulators

Applications

• Off-line power supplies
• AC to DC switching converters
• DC to DC single output power supplies

Procurement Notes

Verify the specific suffix against official Microchip documentation to confirm package type and reliability grade. Confirm that the ordering part number matches the required ceramic flatpack configuration. Check for any specific military or aerospace qualification requirements if applicable to the target system.

Selection Notes

Select this component for designs requiring current-mode control in isolated flyback topologies. Ensure the operating frequency falls within the 100 Hz to 500 kHz range. Verify thermal management capabilities for the -55°C to +125°C operational window. Confirm compatibility with the 12 V to 25 V input voltage range.

Part Context

The SG1845J belongs to the SG1845 family of current-mode PWM controllers manufactured by Microchip Technology. These devices are engineered for high-reliability applications, often serving as core components in industrial and aerospace power systems where stable isolated regulation is critical.

Replacement Considerations

Consult official Microchip substitution guides for verified alternatives. Generic equivalents may not match the specific reliability standards or ceramic packaging characteristics.