The UM3842S8S, manufactured by Union Semiconductor, is a robust off-line PWM controller optimized for current-mode operation. This device operates at a fixed 500 kHz switching frequency, enabling the design of compact and efficient power supplies. Housed in a PDIP8 package, the UM3842S8S offers ease of integration into existing and new designs. It is suitable for a wide range of applications, including AC-DC adapters, battery chargers, and standby power supplies. Supreme Components International is an authorised distributor of Union Semiconductor, ensuring you receive genuine and high-quality components. This PWM controller provides excellent performance and reliability for your power management needs.