SL4520B и другие
| Компонент | Описание | Производитель | |
| NSL-4520 | TO-5 Photocells Hermetic Package |
Silonex Inc. |
 |
| SCL4520B | CMOS DUAL UP COUNTERS |
List of Unclassifed Manufacturers |
|
| SL4520B | Dual Up-Counter |
System Logic Semiconductor |
|
| SL4520BD | Dual Up-Counter |
System Logic Semiconductor |
|
| SL4520BN | Dual Up-Counter |
System Logic Semiconductor |
|