| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LM4924 |  425Kb/16P | 2 Cell Battery, 40mW Per Channel Output Capacitor-Less(OCL) Stereo Headphone Audio Amplifier |
 National Semiconductor ... | LM4924MM |  425Kb/16P | 2 Cell Battery, 40mW Per Channel Output Capacitor-Less(OCL) Stereo Headphone Audio Amplifier |
 National Semiconductor ... | LM4924SD |  425Kb/16P | 2 Cell Battery, 40mW Per Channel Output Capacitor-Less(OCL) Stereo Headphone Audio Amplifier |
 National Semiconductor ... | LM4920 |  1Mb/ 17P | Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier |
| LM49200 |  960Kb/ 26P | Stereo Class AB Audio Subsystem with a True Ground Headphone Amplifier |
 National Semiconductor ... | LM49200TL |  960Kb/ 26P | Stereo Class AB Audio Subsystem with a True Ground Headphone Amplifier |
 National Semiconductor ... | LM49200TLX |  960Kb/ 26P | Stereo Class AB Audio Subsystem with a True Ground Headphone Amplifier |
 National Semiconductor ... | LM4921 |  849Kb/ 18P | Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone Power Amplifiers and Volume Control |