| Manufacturer | Part Number | Description |
|---|---|---|
Motorola Semiconductor (now NXP Semiconductors)
| MV1638 | Silicon Tuning Diodes |
| Knox Semiconductor | MV1638 | ABRUPT VARACTOR DIODES |
| Crystalonics | MV1638 | Voltage Variable Capacitance Diode |
Aeroflex
| MV1638 | Silicon Abrupt Varactors |
