BB837 / BB857 is a silicon tuning diode from DNH Electronics. It features high capacitance ratio, low series resistance, excellent uniformity and matching, and is suitable for satellite indoor units.
The BB837 and BB857 are silicon tuning diodes designed for SAT‑indoor units, offering high capacitance ratio, low series resistance, and excellent uniformity due to an in‑line matching assembly procedure. They are supplied in SOD323 (BB837) and SCD80 (BB857) packages.
The document provides maximum ratings, DC and AC electrical characteristics, diode capacitance versus voltage, and normalized capacitance curves. Key parameters such as reverse voltage, forward current, temperature range, and series resistance are listed for design reference.
| Reverse voltage (Ve) | 30 V |
|---|---|
| Peak reverse voltage (Vem) | 35 V |
| Forward current (If) | 20 mA |
| Operating temperature range | -55 °C to 150 °C |
| Storage temperature range | -55 °C to 150 °C |
| Package (BB837) | SOD323 |
| Package (BB857) | SCD80 |
| Series resistance (Rs) | 1.5 Ω |
| Capacitance ratio (Cr4/Cro5) at Vp=30 V | 10.2 |
The maximum reverse voltage is 30 V.
They are rated for a forward current of 20 mA.
The diodes operate from –55 °C up to 150 °C.
BB837 is supplied in an SOD323 package, while BB857 uses an SCD80 package.