| 2SA1648-Z-E2 | NEC | PNP epitaxial type silicon transistor |
| 2SA1648-Z-T1 | NEC | PNP epitaxial type silicon transistor |
| 2SA1648-Z-T2 | NEC | PNP epitaxial type silicon transistor |
| 2SA1649 | NEC | High-speed switching |
| 2SA1649-Z | NEC | High-speed switching |
| 2SA1649-Z-E1 | NEC | High-speed switching |
| 2SA1649-Z-E2 | NEC | High-speed switching |
| 2SA1649-Z-T1 | NEC | High-speed switching |
| 2SA1649-Z-T2 | NEC | High-speed switching |
| 2SA1650 | NEC | PNP epitaxial type silicon transistor |
| 2SA1652 | NEC | PNP epitaxial type silicon transistor |
| 2SA1669 | Sanyo | High-Frequency Transistors |
| 2SA1674 | Panasonic | Small-signal device - Small-signal transistor - General-use Low-Frequency Amplifires |
| 2SA1682 | Sanyo | General-Purpose Transistors |
| 2SA1683 | Sanyo | General-Purpose Transistors |
| 2SA1685 | Sanyo | High-Speed Switching Transistors |
| 2SA1687 | Sanyo | General-Purpose Transistors |
| 2SA1688 | Sanyo | High-Frequency Transistors |
| 2SA1689 | Sanyo | General-Purpose Transistors |
| 2SA1699 | Sanyo | General-Purpose Transistors |