BB689H7903XTMA1

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	2.9pF @ 28V, 1MHz
Capacitance Ratio:	23.2
Capacitance Ratio Condition:	C1/C28
Voltage - Peak Reverse (Max):	30V
Diode Type:	Single
Q @ Vr, F:	--
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SC-80
Supplier Device Package:	PG-SCD80-2
Base Part Number:	BB689

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Variable Capacitance (Varicaps, Varactors) are diodes that vary their capacitance based on a reverse bias or an external electric field. The BB689H7903XTMA1 is a p-type Varicap diode with an adjustable capacitance range of 2-44 pF (picofarads). This device is commonly used in a variety of applications that require precise capacitance control such as tuners, resonators, and receptors.The design and working principle of the BB689H7903XTMA1 involves a p-type diode layer sandwiched between two metal plates. When biased with direct current in the reverse direction, the applied electric field causes a varying resistance across the junction of the diode. This results in a variation of the device’s capacitance, also known as voltage-dependent capacitance. In other words, this means that when a reverse bias voltage is applied to the BB689H7903XTMA1, its capacitance is changed.Variable Capacitance can be used in a variety of circuits and applications. The most common use for the BB689H7903XTMA1 is its application in tuners. This type of tuner is typically a bandpass filter that is used to select and amplify a specific frequency. The BB689H7903XTMA1 is used to tune the filter by varying its capacitance; the capacitance is then adjusted to tune the filter so that it selects and amplifies the desired frequency.The BB689H7903XTMA1 is also commonly used in applications that require precise capacitance control such as cell phone receivers, spectrum analyzers, and crystal oscillators. Cell phone reception requires precise capacitance for reliable performance, and the BB689H7903XTMA1 ensures that the capacitance is accurate and steady. Spectrum analyzers require an accurate capacitance setting to measure the strength of certain signals while crystal oscillator circuits need precise capacitance values to produce a stable output frequency.The BB689H7903XTMA1 can also be used in harmonic oscillators to generate and amplify high-frequency signals. This type of oscillator typically uses a diode and a capacitor to oscillate at a particular frequency. By employing the BB689H7903XTMA1, the capacitance and frequency can be precisely controlled; this is necessary for accurate signal generation and amplification.Lastly, the BB689H7903XTMA1 is also used in resonators and receptors. A resonator circuit is typically used to filter unwanted noise from a signal, and the BB689H7903XTMA1 can be used to adjust the capacitance of the circuit. This ensures that the resonator is optimized for noise filtering. Similarly, the BB689H7903XTMA1 can be used in receptors to tune the variable capacitance for optimal sensitivity.In conclusion, the BB689H7903XTMA1 is a p-type Varicap diode with an adjustable capacitance range. Variable Capacitance diodes like this one are used in many different types of applications, such as tuners, cell phone receivers, spectrum analyzers, crystal oscillators, harmonic oscillators, resonators, and receptors. This device has proven to be extremely reliable and accurate in capacitance control, making it a popular choice for these applications.

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