AUK Corp catalog First Page, datasheet, datasheet search, data sheet, datasheets, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs, semiconductors This datasheet is subject to change without notice. THE PRODUCT DESCRIBED HERE IN AND THIS DATASHEET ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com ... 2N3904 fT 250 300 − − MHz Output Capacitance (VCB = 5.0 Vdc, IE = 0, f = 1.0 MHz) Cobo − 4.0 pF Input Capacitance (VEB = 0.5 Vdc, IC = 0, f = 1.0 MHz) Cibo − 8.0 pF Input Impedance (IC = 1.0 mAdc, VCE = 10 Vdc, f = 1.0 kHz) 2N3903 2N3904 hie 1.0 1.0 8.0 10 k Voltage Feedback Ratio (IC = 1.0 mAdc, VCE = 10 Vdc, f = 1.0 kHz) 2N3903 2N3904 hre 0.1 0.5 5.0 8.0 X 10−4 Micro Commercial Components 2N3904 datasheet.. If it's not shown correctly, Click here to open the file on a separate window Find where to buy So far, I've tried C1815, and 2N3904 (PDF datasheets linked). 2N3904 works as expected. However, with the C1815, the Collector -> Emitter connection is always open, regardless of how the Base is connected (or not). I've tried multiple samples from the bag of C1815; same behavior: the LED is always on.