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The 2SC2545/6/7 transistors are NPN small-signal transitors which offer a useful combination of low-noise, wide bandwidth, high gain, and good linearity. The 2SA1083/4/5 transistors are their PNP complimentary pairs. As a result, these transistors are an excellent choice for building audio frequency amplifiers as they can provide very good performance. They are especially useful in audio pre-amplifers and as voltage amplifier stages in audio power amps as they can work with emitter-collector voltages up to 100V and above. They are normally sold in the TO-92 plastic package.

When used with medium impedance signal sources (1 to 10 kOhms) they can provide noise figures well below 0.5dB across the audio band with around 1mA collector current.

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NPN Transistors - 2SC2545 / 6 / 7

	2SC2545	2SC2546	2SC2547	units
Vce	60	90	120	V
Ic	100	100	100	mA
Pc	400	400	400	mW
hfe	250 - 1200	250 - 1200	250 - 800	min - max
fT	90	90	90	MHz
Cb	3	3	3	pF
en	0.5	0.5	0.5	nV / Hz1/2

PNP Transistors - 2SA1083 / 4 / 5

	2SA1083	2SA1084	2SA1085	units
Vce	60	90	120	V
Ic	100	100	100	mA
Pc	400	400	400	mW
hfe	250 800	250 - 800	250 - 800	min - max
fT	90	90	90	MHz
Cb	3.5	3.5	3.5	pF
en	0.5	0.5	0.5	nV / Hz1/2

The above ratings are typical figures at 25 Celsius. The voltages and currents are absolute maximum values. The other figures are typical for a collector current of a few millimamps.

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Content and pages maintained by: Jim Lesurf (jcgl@st-and.ac.uk)
using HTMLEdit2 on a StrongARM powered RISCOS machine.
University of St. Andrews, St Andrews, Fife KY16 9SS, Scotland.

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