download free bipolar junction transistor

Saturation – the transistor is “Fully-ON” operating as a switch and Ic = I(saturation).Active Region – the transistor operates as an amplifier and Ic = β*Ib.Then bipolar transistors have the ability to operate within three different regions: The transistor’s ability to change between these two states enables it to have two basic functions: “switching” (digital electronics) or “amplification” (analogue electronics).

Transistors are three terminal active devices made from different semiconductor materials that can act as either an insulator or a conductor by the application of a small signal voltage. The fusion of these two diodes produces a three layer, two junction, three terminal device forming the basis of a Bipolar Junction Transistor, or BJT for short. If we join together two individual signal diodes back-to-back, this will give us two PN-junctions connected together in series which would share a common Positve, (P) or Negative, (N) terminal. The bipolar transistor uses one more layer of semiconductor material to produce a device with properties and characteristics of an amplfier. If some data source only has data for the active region, this is probably good enough.Unlike semiconductor diodes which are made up from two pieces of semiconductor material to form one simple pn-junction. In other words, all of the non-linearities are important, and the behaviour in regions outside of as well as including the active region are also important. I am interested in writing some simulations involving BJTs which requires more information than can be obtained from the typical transistor equations. Some might become dependent on each other if a complete circuit is drawn including an impedance on the base and collector (or emitter) nodes.Īre there any example devices which have (presumably large) tables of data available for download for measurements of these parameters? I don't know if these are all independent - I believe they all are. Transistor temperature, which other variables such as the Collector-Emitter current, might have a second order effect from.Transistor HFE (beta) which is a function of temperature.

To explain further, for a simple BJT circuit we have the following variables. Is there anywhere I can download some current-voltage data for a bipolar junction transistor? (It doesn't matter that much which one.)

Download free bipolar junction transistor