TOP243YN datasheet & pinout | circuit diagram

Find the TOP243YN Reference Manual for comprehensive details on pinout, circuit diagrams, and transistor equivalents. This guide is essential for understanding the TOP243YN's functionality, making it easier to integrate into your projects. Explore buying options and equivalents to optimize your design.

Brands: Power Integrations

Download: TOP243YN Datasheet PDF

Price: inquiry

In Stock: 2,247

Output Isolation: Isolated

Topology: Flyback

Fault Protection: Current Limiting, Over Temperature, Over Voltage

Package: TO-220-7C

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POWER INTEGRATIONS TOP243YN electronic component

TOP243YN Pinout Equivalent

top243yn pinout equivalent 1 e1743394363694
top243yn pinout equivalent 2
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.

Pin	Pin Name	Description
1	Control (C)	The transistor end of the optocoupler, which receives a feedback signal.
2	Line Voltage Detection (L)	Connect the large resistance to the high-voltage DC input, and the input voltage detection and protection function.
3	External Flow Limit (X)	Connect a resistor to ground to limit the maximum current.
4	Source (S)	Connect the negative pole of the power supply and control the reference point of the circuit.
5	Frequency (F)	Ground or C-pin, fast and slow mode switching.
7	Drain (D)	It is connected to the positive pole of the power supply to provide the start-up bias current.

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

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.