LM4991LD/NOPB IC-4991 AMP AUDIO POWER 3W MONO AB 8LLP The LM4991LD/NOPB is a high-quality product offering IC-4991 AMP AUDIO POWER 3W MONO AB 8LLP. With a shrink ratio of N/A and -40°C~+85°C operating temperature, it provides reliability in various applications.