| Manufacturer | Part # | Datasheet | Description |
 Burr-Brown (TI) | OPA251 |  217Kb/12P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
 National Semiconductor ... | OPA251 |  1,005Kb/21P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
 Burr-Brown (TI) | OPA251PA |  268Kb/10P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
| OPA251PA |  217Kb/12P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
 National Semiconductor ... | OPA251PA |  1,005Kb/21P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
 National Semiconductor ... | OPA251PAG4 |  1,005Kb/21P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
 Burr-Brown (TI) | OPA251UA |  268Kb/10P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
| OPA251UA |  217Kb/12P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |
 National Semiconductor ... | OPA251UA |  1,005Kb/21P | Single-Supply, MicroPOWER OPERATIONAL AMPLIFIERS |