TOP243YN datasheet & pinout | circuit diagram

POWER INTEGRATIONS TOP243YN electronic component

TOP243YN Pinout Equivalent

TOP243YN offline switching power supply chip, its main principle is to control the current of the pin to adjust the duty cycle of the internal power MOSFET, so as to achieve the control of the output voltage. It is mainly used in AC-DC converters for low-power applications such as household appliances and small electronic devices.

Note: The direct from designation 5 to designation 7 is due to the fact that it is a multifunction pin (M) in other packages, but it is not available in TOP243YN (TO-220-7C).

TOP243YN Same Type Replacement Model Table

Picture	Model	Manufacturers	Withstand Voltage Value	Switching Frequency Range	Maximum Duty Cycle	Rated Power	Encapsulation
	TOP243YN	Power Integrations	700V	66kHz~132kHz	66.5%	45W	TO-220-7C
	ICE3BR2565JF	Infineon Technologies AG	650V	67kHz	75%	106W	TO-220-6
	LNK302DG	Power Integrations	700V	66kHz~132kHz	66.5%	45W	SOIC-8
	TNY278PN	Power Integrations	700V	66kHz~132kHz	66.5%	45W	DIP-7
	VIPER12A	STMicroelectronics	800V	66kHz~132kHz	66.5%	45W	SO-8
	IRIS4013K	International Rectifier	600V	100kHz ~ 1 MHz	90%	50W~100W	TO-220-5

The best replacement model for TOP243YN is LNK302DG, which has the same switching frequency range (66kHz~132kHz), the same withstand voltage value (700V) as TOP243YN, and the packaging form (SOIC-8) is compatible with TOP243YN’s TO-220-7C packaging during installation

When using ICE3BR2565JF as a substitute, it should be noted that its withstand voltage value is 650V, which is lower than the 700V of TOP243YN. It is necessary to ensure that the voltage in the actual circuit is not higher than 650V. Its switching frequency is fixed at 67kHz, which is different from the variable frequency range of TOP243YN, which may cause changes in the dynamic response and efficiency of the circuit.

TNY278PN, VIPER12A, and TOP243YN have the same withstand voltage and switching frequency range, and the maximum duty cycle is the same, but their packaging is different, which may result in installation failure.

IRIS4013K is not a particularly good substitute in terms of numerical and packaging analysis. Prioritize choosing others when there are better alternatives available.