| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LM4918 |  646Kb/17P | Stereo Audio Amp with AGC Control |
| LM4918LQ |  646Kb/17P | Stereo Audio Amp with AGC Control |
 National Semiconductor ... | LM4910 |  828Kb/22P | Output Capacitor-less Stereo 35mW Headphone Amplifier |
 National Semiconductor ... | LM49100 |  2Mb/24P | Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier |
| LM49100 |  2Mb/26P | Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier |
 National Semiconductor ... | LM49100_0709 |  2Mb/26P | Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier |
 National Semiconductor ... | LM49101 |  839Kb/30P | Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch |
 National Semiconductor ... | LM49101TM |  839Kb/30P | Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch |
 National Semiconductor ... | LM49101TMX |  839Kb/30P | Mono Class AB Audio Subsystem with a True Ground Headphone Amplifier and Earpiece Switch |