BCW73LT1 datasheet(3/6 Pages) LRC

Part #	BCW73LT1

Description	General Purpose Transistors(NPN Silicon)

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Manufacturer	LRC [Leshan Radio Company]

Direct Link	http://www.lrc.cn/

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LESHAN RADIO COMPANY, LTD.

M14–3/6

Noise Figure is Defined as:

NF = 20 log

10 ( –––––––––––––––)

1/ 2

e

n = Noise Voltage of the Transistor referred to the input. (Figure 3)

I

n

= Noise Current of the Transistor referred to the input. (Figure 4)

K

= Boltzman’s Constant (1.38 x 10 –23 j/ °K)

T

= Temperature of the Source Resistance ( °K)

R

s = Source Resistance ( Ω )

e

n

2 +4KTR

S +I n

2 R

S

2

4KTR

S

TYPICAL NOISE CHARACTERISTICS

(V

CE = 5.0 Vdc, T A = 25°C)

f, FREQUENCY (Hz)

Figure 3. Noise Voltage

f, FREQUENCY (Hz)

Figure 4. Noise Current

I

C=1.0 mA

100

µA

300

µA

30

µA

10

µA

I

C=1.0mA

300

µA

100

µA

30

µA

BANDWIDTH = 1.0 Hz

NOISE FIGURE CONTOURS

(V

CE =

5.0 Vdc, T

A = 25°C)

20

10

7.0

5.0

3.0

2.0

10

20

50

100

200

500

1.0k

2.0k

5.0k

10 k

10

20

50

100

200

500

1.0k

2.0k

5.0k

10 k

100

50

20

10

5.0

2.0

1.0

0.5

0.2

0.1

500k

200k

100k

50k

20k

10k

5.0k

2.0k

1.0k

500

200

100

50

1.0M

500k

200k

100k

50k

20k

10k

5.0k

2.0k

1.0k

500

200

100

10

20

30

50

70

100

200

300

500 700 1.0K

10

20

30

50

70

100

200

300

500 700 1.0K

10

20

30

50

70

100

200

300

500 700 1.0K

2.0 dB

3.0 dB 4.0dB

6.0 dB

10 dB

2.0 dB

3.0 dB

5.0 dB

8.0 dB

1.0 dB

2.0 dB

3.0 dB

5.0 dB

8.0 dB

10 Hz to 15.7KHz

10

µA

1.0 dB

500k

200k

100k

50k

20k

10k

5.0k

2.0k

1.0k

500

200

100

50

BCW72LT1

I

C , COLLECTOR CURRENT (µA)

Figure 5. Narrow Band, 100 Hz

I

C , COLLECTOR CURRENT (µA)

Figure 7. Wideband

I

C , COLLECTOR CURRENT (µA)

Figure 6. Narrow Band, 1.0 kHz

~

BANDWIDTH = 1.0 Hz

R

S ~ 0

~

BANDWIDTH = 1.0 Hz

R

S

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