JC501-Q silicon NPN transistor in a TO-92 package by Philips. Download Philips JC501-Q datasheet: This is the "Q" version sometimes mistakenly read as JC5010 (zero) or JC501O ( vowel O) as the markings on the genuine philips packaging are very unclear, only under magnification can the tail of the Q be seen. There is no "O" version produced by Philips' only "- P" (Hfe :135 to 270) , "- Q" (Hfe :200 to 400) and "- R" (Hfe : 300 to 600) Status: NOS (New Old Stock) Tested Components : YES RoHS: no