BB844 is a silicon variable capacitance diode that is produced by Texas Instruments. It is suitable for FM radio tuners and has an extended frequency range of 77MHz to 108MHz. The diode has a high tuning ratio, low voltage supply, monolithic chip (common cathode), and good C-V linearity.
The BB844 is a silicon variable capacitance diode designed for FM radio tuners covering 77 MHz to 108 MHz. It is intended for back‑to‑back diode configurations, offering a high tuning ratio at low supply voltage, a monolithic common‑cathode package, good C‑V linearity and a high figure of merit.
The datasheet lists the diode's maximum ratings, DC and AC electrical characteristics, capacitance values at various reverse bias voltages, capacitance ratios, series resistance, and temperature coefficients, enabling designers to evaluate its suitability for automotive and consumer radio applications. This manual is written in Japanese.
| Diode reverse voltage (Vs) | 18 V |
|---|---|
| Peak reverse voltage (VRM) | 20 V |
| Capacitance ratio (CTo/CTs) | 3.2 |
The diode reverse voltage is 18 V.