Difference between Max and typical values of parameters

[fala]

maxim dg202 edaboard

Hello, In DG202 which is an analog switch there is a parameter named "source off-leakage current". typical value of this parameter in datasheet is 10pA at certain conditions(25C,V+=15V, V-= -15V, Vs=14V, Vd = -14V, Vin=0.8V), but Max value of the same parameter under exactly same conditions has been mentioned 5nA(500 times of typical value). In datasheet it has been stressed that "Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing". I need a leakage current of less than 100pA under same conditions for my design. Can I use this part? Why there is so much difference between typical and max values? If typical values are not reliable why they have been mentioned in datasheet? how much reliable typical values are? what exactly "DESIGN AID ONLY" means?

Complete datasheet link is :
**broken link removed**
Thanks alot.

 

[RFCMOS]

Hi,

I would recommend to not use this switch....
To have such huge gap between the typical and max spec on a parameter avoids any yield loss.
Moreover, it can avoid sometimes to perform test on production lines if the different characterisation (PVT) have shown that the parameter is centered on the typ spec.

Design aid, I assume, means design target.
For more details, please contact maxim.

 

[fala]

Thanks RFCMOS, I did contact maxim but after 1 day they have not responded but I'm still waiting. So do you mean that a designer should always consider max value of errors especially for precision devices like lab instruments? then the phrase "FOR DESIGN AID ONLY" that attributed to typical value of "source off leakage current" seems bizzare, at least!