LM1875T/S7002160

Overview

The LM1875T/S7002160 is a monolithic Class-AB audio power amplifier manufactured by Texas Instruments. It delivers up to 30 watts of output power into 4Ω or 8Ω loads using ±25V to ±30V supplies. The device features extremely low distortion (0.015% at 1 kHz, 20W), a wide power bandwidth of 70 kHz, and an open-loop gain typically of 90 dB. It operates on supply voltages ranging from 16V to 60V with a maximum current capability of 4A. Integrated protection includes internal current limiting, thermal shutdown via a parole circuit, and AC/DC short-circuit protection.

Feature Summary

• Advanced circuit techniques achieve very low distortion levels even at high output power.
• Internal overload protection provides both current limiting and sophisticated thermal shutdown.
• Wide supply range accommodates various consumer audio power requirements.
• High current capability supports demanding speaker loads.

Applications

• High performance audio systems
• Bridge amplifier configurations
• Stereo phonographs
• Servo amplifiers
• Instrument systems

Procurement Notes

Verify the specific ordering suffix against the official TI Package Option Addendum to confirm the exact package variant and environmental compliance status. Ensure the selected component matches the required pinout and marking for your PCB layout. Confirm RoHS and lead finish specifications align with assembly processes.

Selection Notes

Select this amplifier for applications requiring high-quality audio reproduction with minimal external components. Ensure adequate heat sinking is provided, as the TO-220 package requires a thermal resistance low enough to prevent thermal shutdown during normal operation. Verify that the closed-loop gain is set to 10 or greater to maintain stability.

Part Context

This component belongs to the LM1875 family of audio power amplifiers. It is designed for consumer audio applications where low distortion and high reliability are critical. The device utilizes advanced bipolar processing technology to deliver high performance in a plastic power package suitable for through-hole mounting.

Replacement Considerations

LM1875T/NOPB

FAQ

What is the minimum stable closed-loop gain for the LM1875?

The LM1875 is internally compensated and stable when operated at a closed-loop gain of 10 or greater.

How does the thermal protection circuit function?

The device shuts down when the die temperature reaches 170°C and restarts when it drops to approximately 145°C. If the fault persists, subsequent shutdowns occur at 150°C to reduce thermal cycling stress.