BB804,215

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	46.5pF @ 2V, 1MHz
Capacitance Ratio:	1.75
Capacitance Ratio Condition:	C2/C8
Voltage - Peak Reverse (Max):	18V
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:	BB804

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Introduction

Diodes - Variable Capacitance (Varicaps, Varactors) are special purpose semiconductor diodes which are designed to have a variable capacitance over a certain range of voltages. This phenomenon is used in a variety of electronic applications, such as in voltage-controlled oscillators and in tuning circuits. Varicaps can be used in many applications where a variable capacitance is advantageous, such as frequency tuning of oscillators, bandPass filters, phase shift networks and more. This article will explain the application field and working principle of the BB804,215 Varicap diode.

Application Field

The BB804,215 Varicap diode is a high break-down voltage, surface mount varicap diode, designed for use in a variety of applications such as radio frequency items, microwave equipment and portable communications equipment. It offers high performance, small package size and good stability. The typical Capacitance range of the BB804,215 is 0.3 to 3.0 pF for a reverse voltage of 10V to 45V. The capacitance is highly linearly variable with reverse voltage.

Typical Applications

The BB804,215 Varicap diode can be used in a variety of applications. Examples are:

• Voltage controlled oscillators (VCO)
• Local oscillators
• Antenna tuning
• Bandpass filters
• Frequency synthesis
• Phase shift networks
• Other circuit designs requiring capacitance and frequency variations

Working Principle

The working principle of the BB804,215 Varicap diode is based on the phenomenon of space charge effect. When a reverse bias voltage is applied to the diode, a depletion layer is formed at the junction which separates the N-type and P-type semiconductors. This depletion layer acts like a dielectric, which changes its capacitance depending on the reverse bias voltage. As the reverse bias voltage increases, the depletion layer size increases, thus increasing the capacitance of the diode. Inversely, as the reverse bias voltage is reduced, the depletion layer size decreases, thus reducing the capacitance of the diode. The capacitance of the BB804,215 Varicap diode is highly linear over a wide range of voltages.

Conclusion

The BB804,215 Varicap diode is a special purpose semiconductor diode which is designed to have a variable capacitance over a certain range of voltages. It is commonly used in a variety of electronic applications, such as in voltage-controlled oscillators and in tuning circuits. The BB804,215 Varicap diode offers excellent performance in terms of small package size, high performance, good stability and highly linear capacitance. The working principle of the BB804,215 Varicap diode is based on the phenomenon of space charge effect.

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