BB 641 is a high performance silicon variable capacitance diode, suitable for VHF hyperband TV/TR tuners. The device features high capacitance ratio and low series resistance, enabling excellent tuning performance. The operating voltage range of BB 641 is 30 V and the operating current is 20 mA. The maximum reverse voltage is 35 V and the storage temperature range is -55°C to +150°C.
The Siemens BB 641 is a silicon variable capacitance diode intended for VHF hyperband TV/TR tuners, offering a high capacitance ratio and low series resistance.
The datasheet lists maximum ratings such as 30 V reverse voltage, 20 mA forward current, and an operating temperature range of –55 °C to +150 °C. Electrical characteristics include a typical capacitance of 69 pF at 1 V/1 MHz and a SOD‑323 package measuring roughly 0.97 mm × 1.26 mm.
| Reverse voltage (Va) | 30 V |
|---|---|
| Reverse voltage (Vom, R > 5 kΩ) | 35 V |
| Forward current (Ir) | 20 mA |
| Operating temperature range | -55 °C to +150 °C |
| Storage temperature range | -55 °C to +150 °C |
| Thermal resistance (junction‑ambient, Risa) | < 450 K/W |
| Diode capacitance at 1 V, 1 MHz (typ) | 69 pF |
| Diode capacitance at 28 V, 1 MHz (typ) | 2.88 pF |
| Series resistance at 30 pF, 100 MHz (typ) | 1.55 Ω |
| Series inductance | 1.8 nH |
| Package type | SOD‑323 |
| Package dimensions (L × W) | 0.9732 mm × 1.25597 mm |
The BB 641 diode is rated for a reverse voltage of 30 V (35 V when the series resistance exceeds 5 kΩ).
At 1 V and 1 MHz, the typical capacitance is 69 pF.
The diode operates from –55 °C up to +150 °C.