Siemens BB 644 User Manual and Instruction Booklet
Summary
High-performance BB 644 Silicon Variable Capacitance Diode designed specifically for VHF TV-tuner applications. This manual provides comprehensive technical data, including detailed electrical characteristics, capacitance ratios, and low series resistance/inductance figures. It is crucial reading for electronics engineers and designers requiring precise tunable components, especially those needing reliable "in-line" matched assemblies in a compact SMD package.
Page 1 Text Content
BB 644
Silicon Variable Capacitance Diode Preliminary data • For VHF TV-tuners • High capacitance ratio • Low series inductance • Low series resistance • Extremely small plastic SMD package • Excellent uniformity and matching due to "in-line" matching assembly procedure
Type Marking Ordering Code Pin Configuration Package BB 644 yellow 4 Q62702-B0905 group matched 1 = C 2 = A SOD-323 BB 644 yellow 4 Q62702-B0907 unmatched
Maximum Ratings Parameter Value Symbol Unit Diode reverse voltage V30VR
Peak reverse voltage (R ≥ 5kΩ) 35VRM IF 20Forward current m A
Operating temperature range -55 ...+150 °C Storage temperature Tstg -55 ...+150
Semiconductor Group Jul-09-19981 Semiconductor Group 1998-11-01
Page Summary Contents For Siemens BB 644 User Manual and Instruction Booklet
Manual Details
| Brand | Siemens |
|---|---|
| Pages | 3 |
| File Size | 43.58 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What is the operating temperature range for the BB 644 diode?
The specified operating temperature range is from -55°C to +150°C.
What advantage does the 'in-line' matching assembly procedure offer?
It provides excellent uniformity and matching for the variable capacitance diodes.
How is the electrical capacitance of this diode characterized?
Diode capacitance changes based on both voltage (V) and frequency (f), provided in a specific formula or graph.
What package format does this component use?
It is housed in an extremely small plastic SMD package, with common options including SOD-323.