BB149A is a planar technology variable capacitance diode from Philips Semiconductors with excellent linearity and matching performance. It is suitable for use in UHF television tuners and voltage-controlled oscillators (VCO).
The document describes the BB149A as a discrete semiconductor device designed for electronic tuning in UHF television tuners and voltage controlled oscillators (VCO). It features excellent linearity with matching to within 2% when used in sequences of 15 diodes, low series resistance, and is housed in a very small plastic SMD package (SOD323).
The datasheet details limiting values such as a continuous reverse voltage of up to 30V and operating junction temperatures from -55°C to +125°C. It also includes electrical characteristics for capacitance ratios, series resistance, and reverse current at various frequencies and temperatures.
| Continuous reverse voltage | - 30 V |
|---|---|
| Peak reverse voltage | - 35 V |
| Continuous forward current | - 20 mA |
| Storage temperature | -55 +150 °C |
| Operating junction temperature | -55 +125 °C |
| Diode series resistance (typical) | 0.75 Ω |
The capacitance matching is excellent, with a ratio of 2% when measured in a sequence of 15 diodes.
At 1 MHz with 1 V reverse voltage, the capacitance ranges from 18.22 pF to 21.26 pF.