BFR31LT1 datasheet(2/4 Pages) ONSEMI

Part #	BFR31LT1

Description	JFET Amplifiers(N-Channel)

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Manufacturer	ONSEMI [ON Semiconductor]

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BFR30LT1, BFR31LT1

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ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)

Characteristic

Symbol

Min

Max

Unit

OFF CHARACTERISTICS

Gate Reverse Current

(VGS = 10 Vdc, VDS = 0)

IGSS

−

0.2

nAdc

Gate Source Cutoff Voltage

(ID = 0.5 nAdc, VDS = 10 Vdc)

BFR30

BFR31

VGS(OFF)

−

5.0

2.5

Vdc

Gate Source Voltage

(ID = 1.0 mAdc, VDS = 10 Vdc)

BFR30

BFR31

(ID = 50 mAdc, VDS = 10 Vdc)

BFR30

BFR31

VGS

− 0.7

−

− 3.0

− 1.3

− 4.0

− 2.0

Vdc

ON CHARACTERISTICS

Zero − Gate −Voltage Drain Current

(VDS = 10 Vdc, VGS = 0)

BFR30

BFR31

IDSS

4.0

1.0

10

5.0

mAdc

SMALL−SIGNAL CHARACTERISTICS

Forward Transconductance

(ID = 1.0 mAdc, VDS = 10 Vdc, f = 1.0 kHz)

BFR30

BFR31

(ID = 200 mAdc, VDS = 10 Vdc, f = 1.0 kHz)

BFR30

BFR31

yfs

1.0

1.5

0.5

0.75

4.0

4.5

−

mmhos

Output Admittance

(ID = 1.0 mAdc, VDS = 10 Vdc, f = 1.0 kHz)

BFR30

(ID = 200 mAdc, VDS = 10 Vdc)

BFR31

yos

40

20

25

15

mmhos

Input Capacitance

(ID = 1.0 mAdc, VDS = 10 Vdc, f = 1.0 MHz)

(ID = 200 mAdc, VDS = 10 Vdc, f = 1.0 MHz)

Ciss

−

5.0

4.0

pF

Reverse Transfer Capacitance

(ID = 1.0 mAdc, VDS = 10 Vdc, f = 1.0 MHz)

(ID = 200 mAdc, VDS = 10 Vdc, f = 1.0 MHz)

Crss

−

1.5

pF

TYPICAL CHARACTERISTICS

f, FREQUENCY (kHz)

Figure 1. Noise Figure versus Frequency

RS, SOURCE RESISTANCE (Megohms)

Figure 2. Noise Figure versus Source

Resistance

14

0.01

4

3

2

0

12

1

0.1

1.0

10

100

5

10

8

6

4

2

0

0.001

0.01

0.1

1.0

10

VDS = 15 V

VGS = 0

RS = 1 MW

VDS = 15 V

VGS = 0

f = 1 kHz

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