Can LM1875 directly replace TDA2030?

You can change it directly.

LM1875 and TDA2030(A) use the same TO220B packaging method, and the pin definitions are the same. In terms of parameters, the highest voltage LM1875 supports 60V, while IDA2030(A) is 44V. Judging from the chip parameters alone, directly replacing the LM1875 with the TDA2030 will indeed bring about an improvement in bass, mainly in terms of greater power under the same voltage conditions, and better bass strength and transient performance.

At the same time, LM1875 has better distortion control than TDA2030, which is an order of magnitude lower. LM1875 has a distortion value of 0.015 at 20W output, while TDA2030(A) has a typical distortion value of 0.5 at 18W.

Extended information:

lm1875 is a power amplifier integrated block developed by National Semiconductor Company of the United States. It has few peripheral circuits and complete functions during use. Overload protection function, it has a five-pin shape, one pin is the non-inverting signal input, the second pin is the inverting signal input, and the third pin is the negative power supply -Vee (single power supply grounded GND).

The input four pins of the five-pin power supply Vcc are signals, and the output LM1875 is used to make a power amplifier circuit. The LM1875 adopts a TO-220 package structure and is shaped like a medium-power tube. It is compact in size, has simple peripheral circuits, and has a large output power. . The integrated circuit is equipped with overload, overheating and inductive load reverse potential safety protection.