BB199,115 Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	13.8pF @ 2V, 1MHz
Capacitance Ratio:	2.8
Capacitance Ratio Condition:	C0.5/C2
Voltage - Peak Reverse (Max):	20V
Diode Type:	Single
Q @ Vr, F:	--
Operating Temperature:	-65°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SC-79, SOD-523
Supplier Device Package:	SOD-523
Base Part Number:	BB199

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The BB199,115 is a form of variable capacitance (varicaps, varactors), a type of diode. This diode is like a reverse biased diode, in that the voltage applied to the diode creates a current flowing between the anode and the cathode, but unlike other diodes, the current does not remain constant as the voltage is increased. Instead, the current varies with applied voltage, thereby changing the capacitance of the diode, and affording the BB199,115 its variable capacitance properties.Varicaps are often employed in circuits to provide variable capacitance versus frequency tuning. Due to their variable capacitance, they are able to adjust their capacitance values to precisely match the frequency that the circuit should operate at. This can be used to tune a wide range of wireless or telecom devices such as AM radios, TV sets, and even cell phones, although higher performance varicaps are often employed in these devices. The working principle behind varicaps is based on the fact that the capacitance of a diode increases as the reverse voltage (Vr) is increased. The amount of capacitance change depends on the specific characteristics of the diode and the amount of reverse bias. For the BB199,115 the specified capacitance range at the reverse voltage of 8V DC is from 1.6pF to 9.2 pF. To understand why varicaps work, one first needs to understand what capacitance is. In a nutshell, capacitance is the ability of a circuit element to store and release electrical energy. Stated another way, any time two conducting elements are placed near each other, an electric field is created, and this field is able to store and release energy. The amount of energy stored is a function of the amount of charge on the elements, which can be changed by altering the amount of bias on the device or changing the ambient conditions. At the heart of it, the BB199,115 is simply a reverse biased diode, with the anode connected to a supply voltage, while the cathode is connected to the circuit element to be tuned. As the voltage on the anode is increased, more current flows through the diode, creating a larger reverse bias and increasing the capacitance of the diode. As the capacitance increases, the frequency of the circuit increases, allowing for the desired tuning. The beauty of the BB199,115 is that it offers a good range of capacitance versus voltage. With a voltage range of 0V to 8V DC, this diode can provide a wide range of capacitance values (1.6pF to 9.2 pF) while still providing good linearity. This allows it to be very useful in accurately tuning circuits to the correct frequency. In conclusion, the BB199,115 is a form of variable capacitance diode, and is often used in circuits to provide frequency tuning or to provide variable capacitance with changing reverse bias. By changing the amount of reverse bias and hence the amount of current flowing between the anode and the cathode, the capacitance of the diode can be changed to provide the desired frequency tuning. This varicap offers good linearity and can offer a large range of capacitance values at moderate voltage levels, making it especially useful for frequency tuning applications.

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