LM1875T/LF02

Overview

The LM1875T/LF02 is a monolithic Class-AB audio power amplifier manufactured by Texas Instruments. It delivers 20W of output power into an 8-ohm load with ±25V supplies, and exceeds 30W with ±30V supplies. Key electrical parameters include a gain bandwidth product of 5.5 MHz, a slew rate of 8 V/μs, and a typical open-loop gain of 90 dB. The device operates on supply voltages ranging from 16V to 60V, draws 70 mA of quiescent current, and features low total harmonic distortion plus noise of 0.015% at 1 kHz and 20W. It utilizes a TO-220-5 through-hole package.

Feature Summary

• Integrated overload protection featuring internal current limiting and thermal shutdown circuitry.
• High performance characterized by very low distortion and high-quality audio reproduction.
• Internal frequency compensation ensures stability for gains of 10 or greater.

Applications

• Consumer audio equipment
• Signal processing systems
• Speaker amplification

Procurement Notes

Verify the specific suffix LF02 against official Texas Instruments documentation to confirm exact manufacturing lot details and compliance status. Confirm that the component matches the standard LM1875 specifications regarding pinout and thermal characteristics before integration into designs.

Selection Notes

Select this component for applications requiring robust single-channel audio amplification with minimal external components. Ensure the design accommodates the TO-220-5 package dimensions and provides adequate heat sinking for the expected power dissipation levels under the chosen supply voltage conditions.

Part Context

This part belongs to the LM1875 series of audio power amplifiers. It is designed as a direct replacement for legacy National Semiconductor units, maintaining the same functional capabilities while adhering to modern manufacturing standards. The series is recognized for its reliability in consumer electronics.

Replacement Considerations

The LM1875T/NOPB is a verified lead-free alternative within the same family. Verify pin compatibility and thermal requirements when substituting between different suffix variants.