Switching Controllers – Mouser Canada

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NCP1239 Switching Controllers

onsemi NCP1239 Switching Controllers are fixed-frequency current-mode controllers featuring a high-voltage start-up current source to provide a quick and lossless power-on sequence. This function greatly simplifies the design of the auxiliary supply and the V_CC capacitor. These NCP1239 controllers feature a timer-based fault detection circuitry that ensures a quasi-flat overload detection, independent of the input voltage. Typical applications include AC-DC converters for TVs, set-top boxes, and printers offline adapters for notebooks and netbooks.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (CAD) Filter the results in the table by unit price based on your quantity.	Qty.	Topology	Number of Outputs	Switching Frequency	Duty Cycle - Max	Output Voltage	Output Current	Minimum Operating Temperature	Maximum Operating Temperature	Mounting Style	Package / Case	Packaging
Switching Controllers NCP1239E 100KHZ NCP1239ED100R2G onsemi 1: $1.34 2,132In Stock	Mfr. Part # NCP1239ED100R2G Mouser Part # 863-NCP1239ED100R2G	onsemi	Switching Controllers NCP1239E 100KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,132In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 View Reel $0.598 $0.707 $0.678 $0.638 $0.598 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	100 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239E 65KHZ NCP1239ED65R2G onsemi 1: $1.34 2,500In Stock	Mfr. Part # NCP1239ED65R2G Mouser Part # 863-NCP1239ED65R2G	onsemi	Switching Controllers NCP1239E 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,500In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 Reel $0.595 View $0.707 $0.678 $0.638 $0.588 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239D 65KHZ NCP1239DD65R2G onsemi 1: $1.34 2,433In Stock	Mfr. Part # NCP1239DD65R2G Mouser Part # 863-NCP1239DD65R2G	onsemi	Switching Controllers NCP1239D 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,433In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 Reel $0.608 View $0.707 $0.678 $0.638 $0.592 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239G 100KHZ NCP1239GD100R2G onsemi 1: $1.34 2,278In Stock NRND	Mfr. Part # NCP1239GD100R2G Mouser Part # 863-NCP1239GD100R2G NRND	onsemi	Switching Controllers NCP1239G 100KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,278In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 View Reel $0.608 $0.707 $0.678 $0.621 $0.608 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	100 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239J 65KHZ NCP1239JD65R2G onsemi 1: $1.32 2,820In Stock NRND	Mfr. Part # NCP1239JD65R2G Mouser Part # 863-NCP1239JD65R2G NRND	onsemi	Switching Controllers NCP1239J 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,820In Stock	Cut Tape $1.32 $0.949 $0.855 $0.753 View Reel $0.592 $0.703 $0.674 $0.635 $0.592 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239F 65KHZ NCP1239FD65R2G onsemi 1: $1.34 2,495In Stock	Mfr. Part # NCP1239FD65R2G Mouser Part # 863-NCP1239FD65R2G	onsemi	Switching Controllers NCP1239F 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,495In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 View Reel $0.608 $0.707 $0.678 $0.638 $0.608 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239L 100KHZ NCP1239LD100R2G onsemi 1: $1.34 2,500In Stock	Mfr. Part # NCP1239LD100R2G Mouser Part # 863-NCP1239LD100R2G	onsemi	Switching Controllers NCP1239L 100KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,500In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 Reel $0.608 View $0.707 $0.678 $0.655 $0.592	Min.: 1 Mult.: 1 : 2,500	Flyback		100 kHz	84 %		500 mA		+ 150 C	SMD/SMT	SOIC-7	Reel, Cut Tape
Switching Controllers NCP1239C 65KHZ NCP1239CD65R2G onsemi 1: $1.34 2,106In Stock NRND	Mfr. Part # NCP1239CD65R2G Mouser Part # 863-NCP1239CD65R2G NRND	onsemi	Switching Controllers NCP1239C 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,106In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 View Reel $0.602 $0.707 $0.678 $0.655 $0.602 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239K, 65KHZ NCP1239KD65R2G onsemi 1: $1.17 2,505In Stock NRND	Mfr. Part # NCP1239KD65R2G Mouser Part # 863-NCP1239KD65R2G NRND	onsemi	Switching Controllers NCP1239K, 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,505In Stock	Cut Tape $1.17 $0.88 $0.812 $0.736 View Reel $0.612 $0.70 $0.678 $0.661 $0.612 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239A 65KHZ NCP1239AD65R2G onsemi 1: $1.37 158In Stock 12,500Expected 2026-09-22	Mfr. Part # NCP1239AD65R2G Mouser Part # 863-NCP1239AD65R2G	onsemi	Switching Controllers NCP1239A 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	158In Stock 12,500Expected 2026-09-22	Cut Tape $1.37 $0.968 $0.871 $0.762 View Reel $0.589 $0.717 $0.685 $0.658 $0.589 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239B 100KHZ NCP1239BD100R2G onsemi 1: $1.34 1,560In Stock	Mfr. Part # NCP1239BD100R2G Mouser Part # 863-NCP1239BD100R2G	onsemi	Switching Controllers NCP1239B 100KHZ Learn More about onsemi ncp1239 controllers	Datasheet	1,560In Stock	Cut Tape $1.34 $0.955 $0.861 $0.757 View Reel $0.608 $0.707 $0.678 $0.655 $0.608 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	100 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239B 65KHZ NCP1239BD65R2G onsemi 1: $1.41 2,701In Stock	Mfr. Part # NCP1239BD65R2G Mouser Part # 863-NCP1239BD65R2G	onsemi	Switching Controllers NCP1239B 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,701In Stock	Cut Tape $1.41 $0.999 $0.899 $0.788 View Reel $0.632 $0.734 $0.703 $0.677 $0.632 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239I 65KHZ NCP1239ID65R2G onsemi 1: $1.31 2,430In Stock	Mfr. Part # NCP1239ID65R2G Mouser Part # 863-NCP1239ID65R2G	onsemi	Switching Controllers NCP1239I 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	2,430In Stock	Cut Tape $1.31 $0.942 $0.85 $0.746 View Reel $0.589 $0.697 $0.681 $0.66 $0.589 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel
Switching Controllers NCP1239H 65KHZ NCP1239HD65R2G onsemi 2,500: $0.647 12,500Factory Stock Available NRND	Mfr. Part # NCP1239HD65R2G Mouser Part # 863-NCP1239HD65R2G NRND	onsemi	Switching Controllers NCP1239H 65KHZ Learn More about onsemi ncp1239 controllers	Datasheet	12,500Factory Stock Available More Info Available	Reel $0.647	Min.: 2,500 Mult.: 2,500 : 2,500	Flyback	1 Output	65 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel
Switching Controllers NCP1239A 100KHZ NCP1239AD100R2G onsemi 1: $1.41 Non-Stocked Lead-Time 53 Weeks End of Life	Mfr. Part # NCP1239AD100R2G Mouser Part # 863-NCP1239AD100R2G End of Life	onsemi	Switching Controllers NCP1239A 100KHZ Learn More about onsemi ncp1239 controllers	Datasheet	Non-Stocked Lead-Time 53 Weeks	Cut Tape $1.41 $0.989 $0.887 $0.775 View Reel $0.586 $0.757 $0.629 $0.586 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Flyback	1 Output	100 kHz	84 %	13.5 V	500 mA	- 40 C	+ 125 C	SMD/SMT	SOIC-7	Reel, Cut Tape, MouseReel

NCP1239 Switching Controllers

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