TNY279PN datasheet & circuit diagram | pinout

TNY279PN Pinout Equivalent

TNY279PN is an off-line switching power supply IC that features innovative EcoSmart energy-saving technology, which can reduce losses and dissipate heat accurately.
Pin connections and their function sheets

Note: The DRAIN pins are connected to the transformer’s primary winding and need to withstand high voltages, so the PCB traces should be as short and wide as possible in the design. It is used to reduce losses and interference with other components.

TNY279PN table of replacement models of the same type

Picture	Model	Manufacturers	Withstand Voltage Value	Switching Frequency Range	Maximum Duty Cycle	Rated Power	Encapsulation
	TNY279PN	Power Integrations, Inc.	700 V	124 kHz 至 140 kHz	65%	18.5 watts	DIP-8C
	LNK624PG	Power Integrations, Inc.	725 V	93 kHz 至 106 kHz	54%	5.5 watts	PDIP-8C
	NCP1014AP10	Semiconductor Components Industries, LLC	700 V	100 kHz	62%	14 watts	PDIP-7
	VIPer12A	VIPer12A	730 V	54 kHz 至 66 kHz	<50%	13 watts	DIP-8
	UC3842	Fairchild Semiconductor Corporation	30 V	47 kHz 至 57 kHz	95%	Adjustable	DIP-8
	MC34063A	Semiconductor Components Industries, LLC	40 V	24 kHz 至 42 kHz	95%	15W	DIP-8

Note: The best replacement model for TNY279PN is LNK624PG, which has the same packaging and is produced by the same company. It should be noted that the switching frequency of LNK624PG is 93 kHz -106 kHz, the maximum duty cycle is 54%, and the rated power is 5.5 W, which differs from TNY279PN to some extent. Specific reference should be made to the actual circuit situation.

When replacing with NCP114AP10, although the withstand voltage is the same at 700 V, the switching frequency of 100 kHz, duty cycle of 62%, and packaging PDIP-7 are different, which will have a slight impact on the dynamic response and efficiency of the circuit.

VIPer12A has a higher withstand voltage of 730 V, but its switching frequency is between 54 kHz and 66 kHz, duty cycle is less than 50%, and power is 13 W, which needs to be considered in practical situations.

MC34063A and UC3842 have a much lower withstand voltage than TNY279PN, with a large difference in switching frequency between 47 kHz and 57 kHz. They can be replaced in low voltage scenarios, otherwise they may damage the components.