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 amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown. The UTC LM1875 design utilizes advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range.
The LM1875 is a monolithic audio power amplifier IC offering low distortion and high‑quality performance for consumer audio applications. It delivers up to 20 W into a 4 Ω or 8 Ω load on ±25 V supplies and can reach 30 W with an 8 Ω load on +30 V supplies, while requiring minimal external components.
The datasheet lists key features such as a 90 dB gain, 0.015 % THD at 1 kHz (20 W), wide supply range (16 V‑60 V), internal current‑limit and thermal‑shutdown protection, and high current capability (4 A). It also includes absolute maximum ratings, electrical characteristics, typical application circuits, and ordering information.
| Maximum Output Power | Up to 30 W |
|---|---|
| Total Harmonic Distortion (THD) | 0.015 % at 1 kHz, 20 W |
| Open‑Loop Gain | 90 dB |
| Supply Voltage Range | 16 V – 60 V |
| Maximum Output Current | 4 A |
| Ripple Rejection | 94 dB |
| Power Bandwidth | 70 kHz |
| Maximum Supply Voltage (Absolute Rating) | 60 V |
The LM1875 can deliver up to 30 W when used with an 8 Ω load and +30 V supplies.
The device achieves a THD of 0.015 % at 1 kHz with a 20 W output.
It operates over a wide supply range from 16 V to 60 V.