This document describes the features of silicon variable capacitance diodes BB644 and BB664. These diodes are suitable for VHF TV tuners and have high capacitance ratio, low series inductance, low series resistance, and excellent uniformity and matching. The document also lists the maximum ratings and electrical characteristics of these diodes, such as reverse current, diode capacitance, and capacitance ratio.
The BB644 and BB664 series are silicon variable capacitance diodes designed for VHF TV tuners. They offer a high capacitance ratio, low series inductance and resistance, and excellent uniformity due to an in‑line matching assembly procedure.
The document provides maximum ratings, electrical characteristics, capacitance versus voltage curves, and temperature coefficients for the diodes, enabling designers to select appropriate parts for their applications.
| Reverse voltage (VR) | 30 V |
|---|---|
| Peak reverse voltage (Vem) | 35 V |
| Forward current (Ir) | 20 mA |
| Operating temperature range | -55 °C to 150 °C |
| Storage temperature range | -55 °C to 150 °C |
| Capacitance at 1 V, 1 MHz | 39 pF |
| Capacitance at 2 V, 1 MHz | 29.4 pF |
| Capacitance ratio (Cr/Ct) | 15 |
| Series resistance (Rs) | 0.75 Ω |
The diodes are rated for a reverse voltage of 30 V.
The forward current rating is 20 mA.
They operate from –55 °C up to 150 °C.