What are the basics of a transistor Q1?

The humble transistor Q1 Emitter (E) Collector (C) Base (B) Transistor basics •Emitter to base junction is forward biased (normally) •Collector to base junction is reverse biased (normally) •Transistors are current operated devices, so KCL should be applied first: –I E = I C + I B Basics continued •Leakage current: I CBO (Emitter open)

What are the covered topics in the book transistors?

Covered topics are: Transistor uses, Transistor rules, Common emitter circuit, Small signal amplification, Field-effect transistors, JFET operating regions.

How many transistors are there in a PC?

■Darlington Transistors 6 8 10 15 10 15 12 17 5000 30 50 60 60 75 80 80 85 100 130 150 200 110 150 200 150 150 Part No. PC(W) VCEO(V) IC(A) hFE(min) fT(MHz) Package Remarks 2SC4495 2SC4883 2SC4883A 2SA1859 2SA1859A 50 150 180 –150 –180 ■Temperature compensation Transistors and Driver Transistors

How many transistors are in an IBS transistor?

25 20 20 3 2 –2 500 60 60 40 120 60 FM20 (TO220F) Temperature compensation Driver, Complement 2SA1859 Driver, Complement 2SA1859A Driver, Complement 2SC4883 Driver, Complement 2SC4883A 100 60 100 60 100 60 100 60 65 80 65 80 50 55 45 70 50 55 45 70 50 55 45 70 Transistor Selection Guide 4.

How is the IC of a saturated transistor determined?

When a transistor is saturated the collector current Ic is determined by the supply voltage and the external resistance in the collector circuit, not by the transistor’s current gain. As a result the ratio Ic/IBfor a saturated transistor is less than the current gain hFE.

What is the minimum current gain of a transistor?

One of the key characteristics of the transistor is the current gain. This number describes how much the emitter current changes for a given change in the base current. The current gain varies with the amount of current flowing in the collector. For the 2N3904, the minimum current gain at 0.1 mA collector current is 40.

Why do transistors have a maximum collector current?

The base current IBmust be limited to prevent the transistor being damaged and a resistor may be connected in series with the base. Transistors have a maximum collector current Ic rating. The current gain hFEcan vary widely, even for transistors of the same type! A transistor that is full on(with RCE= 0) is said to be ‘saturated’.