The BB909A and BB909B are variable capacitance diodes fabricated in planar technology and encapsulated in hermetically sealed leaded glass SOD68 (DO-34) packages. These diodes have excellent linearity, match accuracy of 2.5% and low series resistance.
The BB909A and BB909B are VHF variable capacitance diodes offered by Philips Semiconductors. They are hermetically sealed, leaded‑glass devices in an SOD68 (DO‑34) package and are intended for electronic tuning in VHF television tuners and VCO applications.
Key specifications include a maximum reverse voltage of 30 V, forward current rating of 20 mA, and operating junction temperature from –55 °C to +100 °C. Capacitance values range from about 31 pF at 1 V bias to 2.6–3 pF at 28 V, with a capacitance‑ratio tolerance of 12‑15 and matching tolerance of 2.5 %. The datasheet also provides graphical data for capacitance, reverse current, and temperature coefficients.
| Maximum reverse voltage | 30 V |
|---|---|
| Maximum forward current | 20 mA |
| Operating junction temperature range | -55 °C to +100 °C |
| Capacitance (BB909A) at 1 V, 1 MHz | 31 pF |
| Capacitance (BB909A) at 3 V, 1 MHz | 23 pF |
| Capacitance (BB909A) at 28 V, 1 MHz | 2.6–3 pF |
| Capacitance (BB909B) at 1 V, 1 MHz | 33.5 pF |
| Capacitance ratio | 12–15 |
| Capacitance matching tolerance | 2.5 % |
The diodes are rated for a maximum reverse voltage of 30 V.
They can handle a continuous forward current of up to 20 mA.
Both diodes are supplied in a hermetically sealed SOD68 (DO‑34) leaded‑glass package.
BB909A has about 31 pF, while BB909B has about 33.5 pF under those conditions.