| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LM131 |  280Kb/16P | Precision Voltage-to-Frequency Converters |
 National Semiconductor ... | LM13121 |  209Kb/8P | 3-Terminal Negative Regulators |
| LM13121Z-12 |  210Kb/8P | 3-Terminal Negative Regulators |
| LM13121Z-12 |  209Kb/8P | 3-Terminal Negative Regulators |
| LM13121Z-15 |  210Kb/8P | 3-Terminal Negative Regulators |
| LM13121Z-15 |  209Kb/8P | 3-Terminal Negative Regulators |
| LM13121Z-5.0 |  210Kb/8P | 3-Terminal Negative Regulators |
| LM13121Z-5.0 |  209Kb/8P | 3-Terminal Negative Regulators |
| LM131A |  280Kb/16P | Precision Voltage-to-Frequency Converters |
| LM131AH/883 |  280Kb/16P | Precision Voltage-to-Frequency Converters |
| LM131H/883 |  280Kb/16P | Precision Voltage-to-Frequency Converters |