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TRS3232: capacitor selection of C1

Part Number: TRS3232

Hello,

We couldn't buy the capacitor which is written in datasheet due to capacitor shortage.

The use condition is below. We can't buy 0.047uF capacitor so we are wondering if 0.1uF can be used for alternative part of 0.047uF. The part number is GRM033R61A104KE84#.

Can TRS3232 work RS232C communication properly? How much does TRS3232 have a tolerance for the capacitor value?

It would be helpful to give us your advice if the 0.1uF is not allowed.

Best regards,

Toshihiro Watanabe

  • Watanabe-san,

    What matters is the ratio of the capacitors (C1/C3, C2/C4), which controls the charge pump output ripple to make it below the pin's abs max voltage. Please refer to this blog for the details. If you only use 0.1uF for C1, you could consider the cap value around 0.7uF for C3. You could use two 0.1uF for C2 and C4. Please let me know if it doesn't make sense to you.

    Regards,

    Hao