LM1875 Datasheet – 20W Audio Power Amplifier

What is LM1875?

This IC is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications.

Part Number: LM1875

Function: 20W Audio Power Amplifier

Package: TO-220 Type

Manufacturer: National Semiconductor was acquired by Texas Instruments (TI) on September 23, 2011.


LM1875 audio power amplifier

Description :

The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding
features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range.

One of the key advantages of the LM1875 is its high output power capability, which makes it suitable for driving large speakers and for use in high-power audio systems. Additionally, its low distortion and wide bandwidth result in high-quality sound reproduction. However, the IC requires a higher supply voltage than some other audio amplifier ICs, which may limit its use in low-voltage applications.


1. Deliver up to 20 watts of output power per channel.

2. Simple circuit design that requires only a few external components.

3. Built-in thermal shutdown feature to prevent damage to the IC and connected components.

4. Suitable for high-fidelity audio applications, stereo amplifiers, home theater systems, and active speakers.

5. Built-in thermal shutdown feature that helps to prevent damage to the IC and the connected components.

6. Low distortion, high slew rate, and wide bandwidth, resulting in high-quality sound reproduction.


LM1875 pinout datasheet

1. Up to 30 watts output power
2. AVO typically 90 dB
3. Low distortion: 0.015%, 1 kHz, 20 W
4. Wide power bandwidth: 70 kHz
5. Protection for AC and DC short circuits to ground
6. Thermal protection with parole circuit
7. High current capability: 4A
8. Wide supply range 16V-60V
9. Internal output protection diodes
10. 94 dB ripple rejection


1. High performance audio systems
2. Bridge amplifiers
3. Stereo phonographs
4. Servo amplifiers
5. Instrument systems



1. What is the difference with LM3875?

The LM3875 is a higher-power version of LM1875, capable of delivering up to 56 watts of output power per channel. LM3875 also has a wider supply voltage range of 20V to 84V DC.

LM1875 Datasheet

LM1875 pdf


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TDA2030A Datasheet PDF – HiFi Power Amplifier – ST

What is TDA2030A?

It is a monolithic integrated circuit (IC) amplifier that is commonly used in audio amplifier applications. This is a high-quality audio amplifier that is capable of delivering up to 18 watts of power into an 8-ohm load, making it suitable for use in a range of audio applications, including home stereo systems and PA systems.

The TDA2030A amplifier IC has a number of features that make it popular in the audio industry, including its high output power, low distortion, and wide frequency response. It also has a built-in thermal and overvoltage protection circuit, which helps to protect the amplifier from damage in case of overheating or voltage spikes.


Part Number: TDA2030A


Package: Pentawatt Vetical Type

Manufacturer: STMicroelectronics

Image and Pinouts:

TDA2030A datasheet



1. Output power 18 W at VS= ±16 V / 4 Ω with 0.5% distortion

2. High output current

3. Very low harmonic and crossover distortion

4. Short-circuit protection

5. Thermal shutdown

Application Circuits :


The TDA2030A is a monolithic IC in a Pentawatt package intended for use as a low-frequency class-AB amplifier. With VS max= 44 V it is particularly suited for more reliable applications without regulated supply and for 35 W driver circuits using low-cost complementary pairs.


This IC is a versatile and reliable audio amplifier IC that is widely used in the audio industry. Its high-quality sound, low distortion, and built-in protection features make it a popular choice for a wide range of audio applications.

TDA2030A Datasheet PDF Download

TDA2030A pdf

Other data sheets are available within the file: TDA2030, TDA2030AV