Piezo buzzer driving range

[ricko_uk]

Hi,
I am using a piezo buzzer Part number PKLCS1212E4001-R1 and datasheet here: https://www.murata.com/products/productdata/8801054490654/SPEC-PKLCS1212E4001-R1.pdf

It says it is +/- 12Vpp so I always drove it within that range. But in a new design it would require driving with 24V pulsed DC to avoid having to modify the PCB. And I came across some online suggesting that might be ok. And Digikey (surely not to be prioritized over the datasheet specs) says 25V which I have no idea where they got that value (it is not mentioned in the datasheet): https://www.digikey.co.uk/en/products/detail/murata-electronics/PKLCS1212E4001-R1/1219314

Thinking about a piezo, the moment the phase is inverted it has a voltage across it twice the previous voltage, so I assume that is ok. But then again there might be other constraints I am not aware of?

Does anybody know?

If it cannot be driven with pulsed 24V DC then can I use a simple Zener diode to limit the voltage across it? If so how do I figure out the maximum current needed by the piezo so I can size the zener resistor? On the datasheet it does not show any impedance value.

Thank you

[Xena E]

It won't be an overvoltage problem, it may be a mechanical excursion issue though, if you need to, just drive one on soak test for as long as you feel necessary.

If you want to reduce the drive, a series resistor equal to the reactance of the piezo at the drive frequency could be used. That should give you your 12V

Regards,
X

[Zero999]

24V pulsed DC, is really 12V+/-12V peak. If you're really paranoid, you could put a capacitor in series and a high value resistor in parallel withe the piezo to get +/-12V peak, without the DC.

[ricko_uk]

Thank you both,

If you want to reduce the drive, a series resistor equal to the reactance of the piezo at the drive frequency could be used. That should give you your 12V

how do I find the reactance? There is no impedance, resistance, reactance or other value on the datasheet.

Thank you

[Xena E]

Find out or measure the capacitance value of the sounder.

Calculate the reactance at the drive frequency from that.

In the event you use Zero999 (better) suggestion, you could just put a (say) 100kΩ resistor across the sounder and empirically decide on a value for the capacitor, checking the voltage across the sounder on your scope, the value will probably equal that of the piezo, normally a few nanofarads upward, (I quickly skimmed the link you gave but didn't see a value).

[ricko_uk]

Thank you