| 305521 | BCY33 | Silicon p-n-p low power transistor | Mullard |
| 305522 | BCY33 | Silicon P-N-P Transistor | Mullard |
| 305523 | BCY33 | Silicon PNP Transistor | VALVO |
| 305524 | BCY34 | Low frequency transistor | mble |
| 305525 | BCY34 | Low frequency transistor | mble |
| 305526 | BCY34 | Silicon p-n-p low power transistor | Mullard |
| 305527 | BCY34 | Silicon P-N-P Transistor | Mullard |
| 305528 | BCY34 | Silicon PNP Transistor | VALVO |
| 305529 | BCY38 | Low frequency transistor | mble |
| 305530 | BCY38 | Low frequency transistor | mble |
| 305531 | BCY38 | Silicon p-n-p low power transistor | Mullard |
| 305532 | BCY38 | Silicon P-N-P Junction Transistor | Mullard |
| 305533 | BCY38 | Silicon P-N-P Junction Transistor | Mullard |
| 305534 | BCY39 | Low frequency transistor | mble |
| 305535 | BCY39 | Low frequency transistor | mble |
| 305536 | BCY39 | Silicon p-n-p low power transistor | Mullard |
| 305537 | BCY39 | Silicon P-N-P Junction Transistor | Mullard |
| 305538 | BCY39 | Silicon P-N-P Junction Transistor | Mullard |
| 305539 | BCY39A | SMALL SIGNAL PNP TRANSISTORS IN TO-5 | SemeLAB |
|
| 305540 | BCY40 | Low frequency transistor | mble |
| 305541 | BCY40 | Low frequency transistor | mble |
| 305542 | BCY40 | Silicon p-n-p low power transistor | Mullard |
| 305543 | BCY40 | Silicon P-N-P Junction Transistor | Mullard |
| 305544 | BCY40 | Silicon P-N-P Junction Transistor | Mullard |
| 305545 | BCY42 | General purpose NPN transistor | FERRANTI |
| 305546 | BCY43 | General purpose NPN transistor | FERRANTI |
| 305547 | BCY54 | Low frequency transistor | mble |
| 305548 | BCY54 | Low frequency transistor | mble |
| 305549 | BCY54 | Silicon p-n-p low power transistor | Mullard |
| 305550 | BCY54 | Silicon P-N-P Junction Transistor | Mullard |
| 305551 | BCY54 | Silicon P-N-P Junction Transistor | Mullard |
| 305552 | BCY55 | Field effect transistor, dual transistors | mble |
| 305553 | BCY55 | Silicon planar n-p-n differential amplifier | Mullard |
| 305554 | BCY55 | Silicon NPN Dual Transistor | Mullard |
| 305555 | BCY56 | Low frequency transistor | mble |
| 305556 | BCY56 | Low frequency transistor | mble |
| 305557 | BCY57 | Low frequency transistor | mble |
| 305558 | BCY57 | Low frequency transistor | mble |
| 305559 | BCY57 | Bipolar NPN Device in a Hermetically sealed TO18 Metal Package | SemeLAB |
| 305560 | BCY58 | Low Noise NPN Transistor | FERRANTI |
