J309 datasheet(2/5 Pages) ONSEMI

Part #	J309

Description	JFET VHF/UHF Amplifiers N-Channel - Depletion

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J309, J310

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

Characteristic

Symbol

Min

Typ

Max

Unit

OFF CHARACTERISTICS

Gate −Source Breakdown Voltage

(IG = −1.0 mAdc, VDS = 0)

V(BR)GSS

−25

−

Vdc

Gate Reverse Current

(VGS = −15 Vdc, VDS = 0, TA = 25°C)

(VGS = −15 Vdc, VDS = 0, TA = +125°C)

IGSS

−

−1.0

nAdc

mAdc

Gate Source Cutoff Voltage

(VDS = 10 Vdc, ID = 1.0 nAdc)

J309

J310

VGS(off)

−1.0

−2.0

−

−4.0

−6.5

Vdc

ON CHARACTERISTICS

Zero −Gate −Voltage Drain Current(1)

(VDS = 10 Vdc, VGS = 0)

J309

J310

IDSS

12

24

−

30

60

mAdc

Gate−Source Forward Voltage

(VDS = 0, IG = 1.0 mAdc)

VGS(f)

−

1.0

Vdc

SMALL− SIGNAL CHARACTERISTICS

Common−Source Input Conductance

(VDS = 10 Vdc, ID = 10 mAdc, f = 100 MHz)

J309

J310

Re(yis)

−

0.7

0.5

−

mmhos

Common−Source Output Conductance

(VDS = 10 Vdc, ID = 10 mAdc, f = 100 MHz)

Re(yos)

−

0.25

−

mmhos

Common−Gate Power Gain

(VDS = 10 Vdc, ID = 10 mAdc, f = 100 MHz)

Gpg

−

16

−

dB

Common−Source Forward Transconductance

(VDS = 10 Vdc, ID = 10 mAdc, f = 100 MHz)

Re(yfs)

−

12

−

mmhos

Common−Gate Input Conductance

(VDS = 10 Vdc, ID = 10 mAdc, f = 100 MHz)

Re(yig)

−

12

−

mmhos

Common−Source Forward Transconductance

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

J309

J310

gfs

10000

8000

−

20000

18000

mmhos

Common−Source Output Conductance

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

gos

−

250

mmhos

Common−Gate Forward Transconductance

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

J309

J310

gfg

−

13000

12000

−

mmhos

Common−Gate Output Conductance

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

J309

J310

gog

−

100

150

−

mmhos

Gate−Drain Capacitance

(VDS = 0, VGS = −10 Vdc, f = 1.0 MHz)

Cgd

−

1.8

2.5

pF

Gate−Source Capacitance

(VDS = 0, VGS = −10 Vdc, f = 1.0 MHz)

Cgs

−

4.3

5.0

pF

FUNCTIONAL CHARACTERISTICS

Equivalent Short−Circuit Input Noise Voltage

(VDS = 10 Vdc, ID = 10 mAdc, f = 100 Hz)

en

−

10

−

nV

Hz

1. Pulse Test: Pulse Width

v 300 ms, Duty Cycle v 3.0%.

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