According to the reference information provided, the PN8126F is a power management chip. In the event that an identical replacement cannot be found, a chip with similar characteristics and functions can be considered for substitution.
According to the information, the PN8126R can replace the PN8126F, and the power can reach 9W. Note, however, that the two chips may differ in some features, so you need to make sure they are compatible in your application scenario when substituting. Evaluate the actual requirements and performance parameters of the chip.
Power chip PN8126F is a high-performance DC-DC buck converter chip, its main features include high efficiency, low voltage difference, wide input voltage range, etc. If you need to replace a chip, you are advised to use a chip with similar performance parameters, such as the common LM2675, LM2677, and LM2679. During the replacement selection, it is necessary to pay attention to the input voltage range, output voltage range, maximum output current and other parameters of the chip to ensure that the replaced chip can meet the application requirements.
It can be replaced by a similar model, just say that it is the same as the current parameter.