2N3904 MMBT390 4. MMPQ390 4 PZT3904. NPN General Purpose Amplifier. This device is designed as a general purpose amplif ier and switch. The useful dynamic range extends to 100 mA as a swi tch and to. 100 MHz as an amplifier. Sourced from Process 23.
The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications.    It is designed for low current and power , medium voltage , and can operate at moderately high speeds. 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.
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 ... 2N2222 datasheet, 2N2222 pdf, 2N2222 data sheet, datasheet, data sheet, pdf Data sheet status Objective speciﬁcation This data sheet contains target or goal speciﬁcations for product development. Preliminary speciﬁcation This data sheet contains preliminary data; supplementary data may be published later. 2N3904S Datasheet, 2N3904S PDF, 2N3904S Data sheet, 2N3904S manual, 2N3904S pdf, 2N3904S, datenblatt, Electronics 2N3904S, alldatasheet, free, datasheet, Datasheets ... Sep 26, 2015 · Calculating the 2 Resistors for a 2N3904 with an IR LED, at 100mA ... On the datasheet V CE(sat) (Collector-Emitter saturation voltage) is listed as 0.2V. That's a ...
2N3904, 2N3904 Datasheet, 2N3904 NPN General Purpose Transistor Datasheet, buy 2N3904 Transistor 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. Is a 2n3906 an suitable substitute for a S8050? What about 2n3904 for a S3550? ... ohh one more thing Iooked at the KMZ52's datasheet and the pcb, I think the current ... NPN General Purpose Amplifier This device is designed as a general purpose amplifier and switch. The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier. Absolute Maximum Ratings* T A = 25°C unless otherwise noted