2N1991 и другие
| Компонент | Описание | Производитель | |
| 2N1990 | Diode TP-39 |
New Jersey Semi-Conductor Products, Inc. |
 |
| 2N1990 | SMALL SIGNAL TRANSISTORS |
Central Semiconductor Corp |
|
| 2N1990R | Diode TP-39 |
New Jersey Semi-Conductor Products, Inc. |
|
| 2N1990S | Diode TP-39 |
New Jersey Semi-Conductor Products, Inc. |
|
| 2N1991 | Bipolar PNP Device in a Hermetically sealed TO39 Metal Package |
Seme LAB |
|
| 2N1991 | Small Signal Transistors |
Central Semiconductor Corp |
|
| 2N1997 | alloy-junction germanium transistors |
List of Unclassifed Manufacturers |
|
| 2N1998 | alloy-junction germanium transistors |
List of Unclassifed Manufacturers |
|
| 2N1999 | alloy-junction germanium transistors |
List of Unclassifed Manufacturers |
|
| AA028N1-99 | 23-30 GHz Low Noise Amplifier |
Alpha Industries |
|