Jd992a datasheet 2n3904

It is a little more powerful than the 2n3904. Most likely the current gain is less, and and maybe also the maximal voltages. Depending on your application that may be OK, which is quite likely if it is not too demanding. The correct thing would for you to check the numbers in the data sheet.

NXP Semiconductors Product data sheet NPN medium frequency transistor BF370 DATA SHEET STATUS Notes 1. Please consult the most recently issued document before initiating or completing a design. 2. The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices.

NXP Semiconductors Product data sheet NPN medium frequency transistor BF370 DATA SHEET STATUS Notes 1. Please consult the most recently issued document before initiating or completing a design. 2. The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. Schematic of very Simple preamplifiers using 2N3904. In electronics, a common emitter amplifier is used as a voltage amplifier. In this circuit the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common.

At 20mA, that's about 120 Ohms. The current gain depends on the collector current, but figure on 50. With a base current of 20mA, that's a collector current of way more than the 2N3904 can handle, so 20mA will saturate it thoroughly. You can probably get by with a lower base current. Look at a 2N3904 datasheet for gain at different collector ... 2N3904 Datasheet (PDF) 1.1. 2n3904g.pdf Size:398K _upd SEMICONDUCTOR 2N3904 TECHNICAL DATA FEATURE NPN silicon epitaxial planar transistor for switching and TO-92 Amplifier applications As complementary type, the PNP transistor 2N3906 is Recommended 1. EMITTER 2. BASE 3. 2N2907A Small Signal Switching Transistor PNP Silicon Features • MIL−PRF−19500/291 Qualified • Available as JAN, JANTX, and JANTXV MAXIMUM RATINGS Rating Symbol Value Unit Collector−Emitter Voltage VCEO −60 Vdc Collector−Base Voltage VCBO −60 Vdc Emitter−Base Voltage VEBO −5.0 Vdc Collector Current − Continuous IC −600 mAdc