The eg BSS84 is an OK 'small signal' P Channel.
For not vastly more (below price only an example) you get 
something like the FDN338 which is very very substantially 
more capable.
The '84 is specd at Vgs = 2.5V but the 338 has far superior 
Rdson at this gate voltage.
If low price is the utter driver then the '84 may be OK.



        Russell


BSS84
$US0.05/3000
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=BSS84ZXTR-ND
50V, 130 mA SOT23
Nominal Vth < -2V.


FDN338
$US0.11/1000
20V, 1.6A
SSOT-3 (super SOT23)
0.5V Vds at Vgs=2.5Vat 2A.



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