LM1875T

Overview

The LM1875T is a single-channel Class-AB audio power amplifier manufactured by Texas Instruments. It delivers 20 W of output power into an 8 Ohm load with ±25 V supplies, exceeding 30 W with ±30 V and an 8 Ohm load. Key electrical parameters include a gain bandwidth product of 5.5 MHz, a slew rate of 8 V/µs, and a total harmonic distortion plus noise of 0.015% at 1 kHz and 20 W. The device operates on supply voltages ranging from 16 V to 60 V, features a maximum quiescent current of 70 mA, and has an input offset voltage of 15 mV. It utilizes a TO-220-5 through-hole package.

Feature Summary

• Integrated overload protection featuring internal current limiting and thermal shutdown mechanisms.
• High performance characteristics including low distortion, high gain, and wide power bandwidth.
• Internal compensation ensures stability for closed-loop gains of 10 or greater.
• Designed for operation with minimal external components.

Applications

• Consumer audio equipment
• Speaker amplification systems
• Signal processing circuits

Procurement Notes

Verify the specific suffix (e.g., NOPB) against the datasheet to confirm RoHS compliance status, as legacy versions may differ. Ensure the TO-220-5 package matches the target PCB footprint. Confirm that the operating temperature range meets the environmental requirements of the final assembly. Cross-reference the manufacturer part number with official TI documentation to avoid counterfeit components.

Selection Notes

Select this component for applications requiring high-power mono audio amplification with robust protection features. It is suitable for designs needing wide supply voltage flexibility and low distortion without complex external compensation networks. Consider the thermal management requirements associated with the TO-220 package when designing for high-output scenarios.

Part Context

The LM1875T belongs to the LM1875 series of audio power amplifiers. This family is characterized by its ability to deliver significant power with simple circuit topologies. The device represents a standard solution in consumer electronics for driving speakers efficiently while maintaining audio fidelity and protecting against operational faults.

Replacement Considerations

LM1875T/NOPB