Can a piezo buzzer generate damaging voltages?

On 11/10/17 13:37, Clifford Heath wrote:
> On 11/10/17 20:08, o pere o wrote:
>> On 10/10/17 02:15, John Speth wrote:
>>> My team is being asked to find out why a circuit is failing for no 
>>> obvious reason.  The circuit has a piezo buzzer (CEP2242 from CUI, 
>>> Inc).   The buzzer is driven by a MCU driven FET that completes a 
>>> circuit like this: high side power 3.3V -> buzzer -> FET -> ground 
>>> (BSS123LT1 FET on the low side).
>>>
>>> Does anybody have any experience with the possibility of a piezo 
>>> buzzer generating damaging voltage spikes when dropped?  We have no 
>>> protection diodes on this part of the circuit.
>>>
>>> At this stage, we have no information of exactly what's failing.  We 
>>> do have evidence that some failed units have been dropped.  I'm 
>>> following through on a hypothetical failure path which we need to 
>>> either consider further or discard.
>>>
>>> Thanks - JJS
>>>
>>
>> As John points out in his response
> 
> Who?

Sorry, should have been Clifford :)

Pere