NCP1239AD100R2G

AC DC Converters, Offline Switchers Overview

The NCP1239AD100R2G is an offline switch designed for flyback topology applications. It operates at a fixed switching frequency of 100 kHz with a maximum duty cycle of 80%. The device features a startup voltage of 12 V and accepts a supply voltage range of 8.8 V to 35 V. It is housed in a 7-SOIC package (8-SOIC body, 3.90 mm width) suitable for surface mount installation. The component supports isolated outputs and includes comprehensive fault protection mechanisms such as current limiting, overloading, over-temperature, and over-voltage protection. It functions within a junction temperature range of -40°C to 125°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrated current-mode control for stable operation in flyback converters
• Comprehensive fault protection including current limit, overload, thermal shutdown, and overvoltage lockout
• Fixed frequency operation optimized for EMI reduction and transformer design simplicity
• High reliability with extended industrial temperature rating capabilities

AC DC Converters, Offline Switchers Applications

• Offline AC/DC power supplies
• Flyback converter designs
• Adapter and charger circuits
• Low standby power applications

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix AD100R2G against official onsemi documentation to confirm the 100 kHz frequency variant and tape-and-reel packaging configuration. Confirm RoHS compliance status and lead-free characteristics prior to integration. Check for any recent Product Change Notifications regarding manufacturing site or material composition updates. Ensure the 7-SOIC footprint matches the PCB layout requirements. Validate that the component meets all relevant safety standards for the target application region.

AC DC Converters, Offline Switchers Selection Notes

Select this component when a fixed-frequency solution is required for flyback topologies. It is suitable for designs needing integrated protection without external discrete components. Consider the 100 kHz frequency for balancing efficiency and size. Verify input voltage ranges align with the 8.8 V to 35 V Vcc specification. Evaluate thermal management needs given the 125°C junction temperature limit. Compare against other NCP1239 variants if different frequencies or pinouts are needed.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1239 family of high-performance PWM controllers from onsemi. The family offers various frequency options and pin configurations tailored for different power levels. The NCP1239 series is known for low standby power consumption and robust protection features. It serves as a core component in modern offline power supply designs requiring high efficiency and reliability.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1239LD100R2G: Same 100 kHz frequency but may have different internal switch characteristics or pinout variations; verify datasheet compatibility. NCP1239HD65R2G: Different 65 kHz frequency; not a direct functional substitute unless frequency change is acceptable.