The Siemens BB 640 is a silicon variable capacitance diode intended for use in Hyperband TV/VTR tuners. The sheet provides ordering information, pin configuration, and package details for the SOD‑323 form factor.
Key electrical characteristics are listed, including reverse voltage, forward current, temperature ranges, and capacitance values at various bias conditions. Thermal resistance and series parasitics are also specified for design reference.
| Maximum reverse voltage (Vr) | 30 V |
|---|---|
| Maximum forward current (Ir) | 20 mA |
| Operating temperature range | -55 °C … +150 °C |
| Junction‑ambient thermal resistance (Rja) | < 450 K/W |
| Series resistance (rs) | 1.15 Ω |
| Series inductance (Ls) | 2 nH |
| Capacitance ratio (cn) | 19.5 – 25 |
| Capacitance matching tolerance | ±2.5 % |
The maximum reverse voltage is 30 V.
It can handle a forward current of up to 20 mA.
The device operates from –55 °C to +150 °C.