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AM3352 ZCE decoupling capacitor query

Other Parts Discussed in Thread: AM3352

Hi All,

My customer is working on AM3352, they have the following pertaining to decoupling:

1)      As per the datasheet, ceramic capacitor types are proposed   (i.e., X5R, X7R etc). Hopefully class 2 ceramic capacitor is enough for decoupling requirement.- please confirm this point. - would X5R or X7R ceramic capacitors work? X7R capacitors are hard to get, it would preferable to get data on X5R capacitors.

2)      Propose part no. of manufacturers for 10nF and 10uF capacitors ( preferably Murata, AVX, Wurth, Yageo, Vishay). can we propose any manufacturers for the customer?

Looking forward to a response.

anatya

  • Hi,

    Component selection is the designer's responsibility. We cannot recommend third-party products. They should choose their components based on their design requirements.
  • TI provides a typical capacitance value recommendation for power supply decoupling capacitors. The product designer must understand operating conditions when selecting decoupling capacitors and insure their actual value under these operating conditions provide the recommended capacitance. The actual capacitance value can also vary from one manufacture to another for similar rated capacitors. Therefore, it is important to review the respective data sheet of each capacitor manufacture being considered to fully understand the effect of operating condition on actual capacitance value.

    The effectiveness of decoupling capacitors is also very dependent on the PCB layout. Excess parasitic inductance of decoupling capacitor connections to the power distribution network (PDN) can significantly reduce the effectiveness of a decoupling capacitors as the frequency of power supply transients increase.  The PCB designer must understand best engineering practices when placing decoupling capacitors and connecting them to the PDN.

    Regards,
    Paul

  • X5R capacitors are fine for most designs. However, please be aware of the following topics:

    X5R/X7R capacitors have a derating of capacitance at high voltages. So if you want to block a 5V voltage with a 6.3V capacitor, the capacitance may be only 50% of the rated capacitance. If in doubt, use a bigger capacitor.

    If your design should be working at very low or high temperatures, check the function of capacitance over temperature, and stay away from Y5V capacitors.

    All of your mentioned manufacturers make capacitors of good quality.