Nevertheless, a 2n and many other power transistors. The 2n3904 is an npn transistor that can only switch onethird the current of the 2n2222 but has otherwise similar characteristics. Unit small signal current gain at vce 10 v, ic 1 ma, f 1. Complete technical details can be found at the 2n3904 datasheet given at the end of this page. In my book, beta min is 100 and beta max is 300 at ic 10 ma. The 2n3904 is common generalpurpose lowpower npn transistor used amplifying or switching applications.
Compare ac beta and dc beta list and define the h parameters r parameters the r parameters that are commonly used for bjts are given in table 61. Onsemi general purpose transistorsnpn silicon,alldatasheet, datasheet, datasheet search site for electronic. The type was registered by motorola semiconductor in the mid1960s, together with. This device is designed as a general purpose amplifier. Common emitter amplifier with 2n3904 electronics forums. Vce, the voltage that falls across the collectoremitter junction of a bipolar junction transistor, is a crucial voltage to dc analysis of a transistor circuit. The 2n3904 is a common npn bipolar junction transistor used for general purpose lowpower. However, if it is not given, it can be calculated if the currents, ib the base current. It is designed for low current and power, medium voltage, and can operate at moderately high speeds. It is designed for low current and power, medium voltage. When figuring out dc current gain, the beta value is part of the formula. Current bias beta dependence unfortunately, beta is very poorly controlled and may easily vary from 50 to 200. The 2n3904 exhibits its forward gain beta peak at a lower. The characteristic curves for a transistor provide a powerful tool in the design and analysis of transistor circuits.
Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. The 2n3904 is a common npn bipolar junction transistor used for generalpurpose lowpower amplifying or switching applications. Npn general purpose amplifier, 2n3904 datasheet, 2n3904 circuit, 2n3904 data sheet. Kst900 2 2n3904 absolute maximum ratings ta25 c characteristic symbol ratings unit collectorbase voltage vcbo 60 v collectoremitter voltage vceo 40 v emitterbase voltage vebo 6v collector current ic 200 ma collector dissipation pc 625 mw junction temperature tj 150 c storage temperature range tstg55150 c. The minimum beta for a 2n3904 transistor at 1ma and with a vce of 1. Beta is the ratio of emitter current to base current. However, the beta, smbus interface remote diodeconnected transistor no beta compensation figure 3. Free packages are available maximum ratings rating symbol value unit collector.
Fairchild, alldatasheet, datasheet, datasheet search site for electronic. This graph from the 2n3904 datasheet shows a typical saturation voltage around 50 mv between 1 ma and 10 ma collector current. Basic operation of npn left and pnp right bipolar junction transistors. Npn switching transistor 2n3904 features low current max. Even the defining parameter the current gain or h fe is not particularly constant and depends on i b. This stage is called saturation region and the typical voltage allowed across the collectoremitter vce or collectorbase vcb could be 40v. In case youre curious about which to use, or which one is better or superior than the other, in this article, we compare. A 2n3904 transistors beta max value is 150 and min value is 100. A typical transistor such as the 2n3904 has a beta of about 100 to 300.
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