BB207,235

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	26.3pF @ 8V, 1MHz
Capacitance Ratio:	3.3
Capacitance Ratio Condition:	C1/C7.5
Voltage - Peak Reverse (Max):	15V
Diode Type:	1 Pair Common Cathode
Q @ Vr, F:	--
Operating Temperature:	-55°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	TO-236AB (SOT23)
Base Part Number:	BB207

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Introduction

Variable capacitance diodes, also known as varactors or Varicaps, are a type of semiconductor device used to store electrical energy. Basically, these are PN junction diodes which are operated in reverse bias configuration. A voltage applied across the terminals of these diodes changes the width of the depletion layer and thus, affects their capacitance. As a result, such diodes have an adjustable capacitance that can be used in different applications. The most popular type of variable capacitance diode is BB207,235.

BB207,235 Application Field and Working Principle

BB207,235 is a general purpose variable capacitance diode. It has low cost, low impedance, and high current capacity, making it suitable for use in a variety of applications. One of its primary applications is in analog circuits and voltage tuning. It is used in radio receivers, frequency synthesizers, oscillators, and other radio frequency (RF) circuits.BB207,235 is a silicon junction diode with a junction area of 0.1mm2. Its reverse bias capacitance typically ranges from 40 to 400pF (depending on the applied reverse bias voltage). This diode has a low equivalent series resistance of 0.5Ω which allows it to operate at high frequency, up to 900MHz.When the reverse bias voltage is increased, the width of the depletion layer increases and the capacitance decreases accordingly. Thus, the value of the capacitance can be easily adjusted simply by increasing or decreasing the reverse bias voltage.

Advantages

The main advantage of BB207,235 is its low cost and high current capacity. It also has an adjustable capacitance that ranges from 40 to 400pF, making it well suited for use in various applications. Its equivalent series resistance is also low which allows it to operate at high frequencies.The physical structure of this diode is also quite small, making it suitable for use in compact devices. Furthermore, its total capacitance variations are predictable and it is resistant to shock and vibration.

Disadvantages

The main drawback of BB207,235 is that the capacitance is affected by temperature, humidity, and radiation. It also requires a minimum reverse bias voltage to produce the desired capacitance.

Conclusion

BB207,235 is a general purpose variable capacitance diode widely used in analog and RF circuits. It has a low cost, low impedance, and high current capacity, which makes it suitable for use in a variety of applications. Its small physical size and adjustable capacitance make it an attractive choice for many electronics projects. The diode does have some drawbacks, such as a dependence on temperature, humidity, and radiation. Despite these issues, this device remains a popular choice for many RF circuits.

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