The UTC LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. It delivers 20W into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and +30V supplies, over 30W of power may be delivered.
The LM1875 is a monolithic audio power amplifier IC that delivers up to 30 W into 4 Ω or 8 Ω loads with low distortion and high gain. It includes internal current limiting and thermal shutdown for overload protection, and operates over a wide supply range of 16 V to 60 V.
Key specifications such as output power, THD, gain, and current capability are listed, along with typical application circuits, ordering information, and absolute maximum ratings. The document also provides characteristic curves for distortion, supply current, and thermal performance.
| Maximum Output Power | 30 W |
|---|---|
| Total Harmonic Distortion (20 W, 1 kHz) | 0.015 % |
| Voltage Gain (Avo) | 90 dB |
| Supply Voltage Range | 16 V‑60 V |
| Maximum Output Current | 4 A |
| Ripple Rejection | 94 dB |
| Power Bandwidth | 70 kHz |
| Supply Voltage (Vcc) Rating | 60 V |
The LM1875 can deliver up to 30 W into a 4 Ω or 8 Ω load.
The THD is 0.015 % at 1 kHz when delivering 20 W.
It operates from 16 V up to 60 V supply voltage.
The device has internal current limit, thermal shutdown, and protection for AC and DC short circuits to ground.