CMR04F391JOAM

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Mica and PTFE capacitors are notable for their ability to provide exceptional high frequency performance. The CMR04F391JOAM is a CMIC capacitor manufactured by Murata Manufacturing that falls into this category, and is ideal for use in telecom and other high frequency applications. Its features and working principle can be summarized as follows.

Features of CMR04F391JOAM

The Murata CMR04F391JOAM is a CMIC (SMT mica capacitor) rated at 4.7µF 50V DC. Its miniature EIA 0201 (0.6 x 0.3mm) metric size allows better performance in smaller form factor designs. The capacitor also has a very low ESR (0.2R max) and ESL (0.2nH max), making it ideal for use in channel RF applications that require stable voltage and current delivery. The capacitor’s temperature rating is -55 to +125°C, making it suitable for harsh environments.

The CMR04F391JOAM has a flat impedance response from 1 to 4GHz with very low variation in impedance magnitude throughout the frequency range. This helps reduce performance variations in the circuit and improve system reliability.

Working Principle of CMR04F391JOAM

The CMR04F391JOAM capacitor is constructed of an inner multi-layer mica dielectric filled with PTFE and a metal foil external electrode. The combination of the mica and PTFE dielectrics provides low capacitance and low temperature coefficient of capacitance (20~30ppm/degC). The dielectric constant of the mica allows it to achieve very low capacitance values compared to other materials.

The metal foil external electrode helps reduce the parasitic components of the capacitor like equivalent series resistance (ESR) and equivalent series inductance (ESL). The low ESR further enhances the quality of the capacitor by decreasing the DCripple voltage on unloaded lines.

The CMR04F391JOAM is also RoHS compliant, providing environmental and safety benefits to circuit designers.

Applications of CMR04F391JOAM

The Murata CMR04F391JOAM capacitor is well-suited for use in telecom and other high frequency applications. Its small size makes it ideal for use in small form factor designs, and its low ESR and ESL help reduce parasitic effect and improve the circuit’s performance. The capacitor’s RoHS compliance ensures its safety in different working environments.

The CMR04F391JOAM can also be used in high speed power conditioning circuits such as switched mode power supplies and power inverters. Its thin dielectric and low temperature coefficient of capacitance provide excellent performance in high frequency applications. The capacitor is also used in communications and networking applications for DC-DC conversion.

Finally, the CMR04F391JOAM is a great choice for any RF design project, as its low impedance and flat frequency response make it ideal for integrated circuits and filters. The capacitor’s small size also helps reduce board space requirements.

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