| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LPC661 |  311Kb/13P | Low Power CMOS Operational Amplifier |
 National Semiconductor ... | LPC661AIM |  311Kb/13P | Low Power CMOS Operational Amplifier |
 National Semiconductor ... | LPC661AIN |  311Kb/13P | Low Power CMOS Operational Amplifier |
 National Semiconductor ... | LPC661AMN |  311Kb/13P | Low Power CMOS Operational Amplifier |
 National Semiconductor ... | LPC661IM |  311Kb/13P | Low Power CMOS Operational Amplifier |
 National Semiconductor ... | LPC661IN |  311Kb/13P | Low Power CMOS Operational Amplifier |
| LPC661 |  363Kb/17P | Low Power CMOS Operational Amplifier |