TS921 is a single-channel audio amplifier from ST, featuring high output current, low noise, low distortion, suitable for low voltage or battery-powered audio systems.
The TS921 rail‑to‑rail operational amplifier is optimized for 3 V and 5 V operation and can operate from 2.7 V to 12 V. It delivers high output current (80 mA) suitable for low‑impedance loads such as headphone drivers, piezoelectric speakers, and line drivers. The device offers low noise (9 nV/√Hz), low distortion, and robust ESD protection, making it ideal for battery‑operated audio and instrumentation applications.
The datasheet provides detailed electrical characteristics, absolute maximum ratings, and package mechanical data for DIP8, SO‑8, and TSSOP8 variants. It also includes macromodels for simulation, along with ordering information and revision history.
| Output current | 80 mA (able to drive 32 Ω loads) |
|---|---|
| Supply voltage range | 2.7 V to 12 V |
| Slew rate | 0.7 – 1.3 V/µs |
| Noise density | 9 nV/√Hz |
| Common‑mode rejection ratio | 60 – 80 dB |
The TS921 can source up to 80 mA, which is sufficient to drive 32 Ω loads.
The device operates from 2.7 V up to 12 V.