MMBV109LT1

Series:	--
Packaging:	Cut Tape (CT)
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	32pF @ 3V, 1MHz
Capacitance Ratio:	6.5
Capacitance Ratio Condition:	C3/C25
Voltage - Peak Reverse (Max):	30V
Diode Type:	Single
Q @ Vr, F:	200 @ 3V, 50MHz
Operating Temperature:	125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3 (TO-236)
Base Part Number:	MMBV109

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Introduction

Variable capacitance diodes, commonly referred to as varicaps or varactors, are diodes used to control the charging or discharging of a capacitor by varying the amount of charge that enters or leaves the capacitor. The MMBV109LT1 is a popularly used varactor diode, typically used in TV/video tuning applications.

MMBV109LT1 Application Field & Working Principle

The MMBV109LT1 is configured for variable capacitance applications, making it a perfect fit for, but not limited to, impedance-matching networks, filters, oscillators, tuned circuits, and tuning of AM and FM receivers. The diode is equipped with an integrated guard-ring structure and a high reliability glass passivation technology to make it suitable for use in outdoor conditions and provide excellent mechanical parameters. The working principle of the MMBV109LT1 is based on reverse bias capacitance-voltage (C-V) variation. Essentially, when a reverse bias voltage is applied to the diode, the reverse electric field generated by the applied voltage alters the resistivity of the junction region and affects the total capacitance. The amount of capacitance changes will then depend on the applied voltage and it can be used to adjust the capacitance in various applications.

Performance Parameters

The MMBV109LT1 operates from -55°C to +125°C and features a low series resistance at 70 mΩ maximum. The device also features a reverse bias leakage current of 200 nA (maximum at 25°C) and a maximum forward bias reverse current of 500 µA. Its nominal capacitance at 1MHz, 5V is 65 pF, while its dynamic capacitance range is between 5-125 pF (maximum). The MMBV109LT1 is also equipped with a variety of features such as hermetic ceramic, long-term reliability and low lead inductance.

Conclusion

The MMBV109LT1 provides an efficient and reliable solution for variable capacitance applications. Its dynamic capacitance range, low series resistance, hermetic ceramic, long-term reliability and low lead inductance make it suitable for use in various applications. In TV/video tuning applications, the MMBV109LT1 performs exceptionally well and provides a reliable way to adjust the capacitance needed.

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