LM1875T/LB02

Overview

The LM1875T/LB02 is a monolithic Class-AB audio power amplifier in a TO-220-5 package. It delivers up to 30W into an 8Ω load with ±30V supplies and 20W at ±25V. Key electrical parameters include a typical open-loop gain of 90 dB, a gain-bandwidth product of 5.5 MHz, and a maximum slew rate of 8 V/μs. The device operates on supply voltages from 16V to 60V, features a quiescent current of 70 mA, and includes internal output protection diodes.

Feature Summary

• Provides high-quality performance with extremely low distortion levels even at high output power.
• Features sophisticated thermal protection that shuts down the device at 170°C and resumes operation at lower temperatures to reduce thermal cycling stress.
• Includes internal current limiting and short-circuit protection for AC and DC conditions.
• Designed for stability at closed-loop gains of 10 or greater with minimal external components.

Applications

• High Performance Audio Systems
• Bridge Amplifiers
• Stereo Phonographs
• Servo Amplifiers
• Instrument Systems

Procurement Notes

Verify the specific suffix LB02 against the official Package Option Addendum, as standard listings typically utilize LF or NOPB designations. Confirm RoHS compliance status and lead finish specifications directly from the manufacturer's documentation prior to ordering. Ensure the procurement channel provides valid traceability data for this active production component.

Selection Notes

Select this component for applications requiring high current capability and wide supply voltage ranges. Ensure the printed circuit board layout separates low-level input grounds from high-current output paths to prevent oscillation. Verify that the heat sink selection maintains junction temperatures below the thermal shutdown threshold during continuous operation.

Part Context

This part belongs to the LM1875 series of audio power amplifiers manufactured by Texas Instruments. The series is characterized by its robust construction and ability to drive reactive loads effectively. The LM1875T/LB02 variant utilizes the TO-220 physical package format, which facilitates direct mounting to chassis or heatsinks for efficient thermal management.

Replacement Considerations

LM1875T/NOPB

FAQ

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

The amplifier is internally compensated and designed to be stable when operated at a closed-loop gain of 10 or greater.

How does the thermal protection mechanism function?

The device shuts down when the die temperature reaches 170°C and restarts when it drops to approximately 145°C, preventing long-term thermal stress.