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FEATURES
LOWDRIFT|∆VGS1‐2/∆T|=5µV/°Cmax.
LOWLEAKAGEIG=20pATYP.
LOWNOISEen=10nV/√HzTYP.
ABSOLUTEMAXIMUMRATINGS
@25°C(unlessotherwisenoted)
MaximumTemperatures
StorageTemperature‐65°Cto+200°C
OperatingJunctionTemperature+150°C
MaximumVoltageandCurrentforEachTransistor–Note1
‐VGSSGateVoltagetoDrainorSource60V
‐VDSODraintoSourceVoltage60V
‐IG
(
f
)
GateForwardCurrent50mA
MaximumPowerDissipation
DeviceDissipation@FreeAir–Total400mW@25°C
MATCHINGCHARACTERISTICS@25°CUNLESSOTHERWISENOTED
SYMBOLCHARACTERISTICSVALUEUNITSCONDITIONS
|VGS1‐2/T|max.DRIFTVS.
TEMPERATURE
50µV/°CVDG=20V,ID=200µA
TA=‐55°Cto+125°C
|VGS1‐2|max.OFFSETVOLTAGE15mVVDG=20V,ID=200µA
ELECTRICALCHARACTERISTICS@25°C(unlessotherwisenoted)
SYMBOLCHARACTERISTICSMIN.TYP.MAX.UNITSCONDITIONS
BVGSSBreakdownVoltage60 ‐‐ ‐‐ VVDS=0ID=1µA
BVGGOGate‐To‐GateBreakdown60 ‐‐ ‐‐ V IG=1nAID=0IS=0
YfSS
TRANSCONDUCTANCE
FullConduction
1000
2000
3000
µmho
VDG=20VVGS=0Vf=1kHz
YfSTypicalOperation5007001000µmho VDG=20VID=200µA
|YFS1‐2/YFS|Mismatch ‐‐ 0.63%
IDSS
DRAINCURRENT
FullConduction
0.5
2
5
mA
VDG=20VVGS=0V
|IDSS1‐2/IDSS|MismatchatFullConduction ‐‐ 15%
VGS(off)orV
p
GATEVOLTAGE
Pinchoffvoltage
1
2
4.5
V
VDS=20VID=1nA
VGS(on)OperatingRange0.5 ‐‐ 4V VDS=20VID=200µA
‐IG
GATECURRENT
Operating
‐‐
20
50
pA
VDG=20VID=200µA
‐IGHighTemperature ‐‐ ‐‐ 50nATA=+125°C
‐IGReducedVDG ‐‐ 5 ‐‐ pAVDG=10VID=200µA
‐IGSSAtFullConduction ‐‐ ‐‐ 100pAVDG=20VVDS=0
YOSS
OUTPUTCONDUCTANCE
FullConduction
‐‐
‐‐
5
µmho
VDG=20VVGS=0V
YOSOperating ‐‐ 0.11µmhoVDG=20VID=200µA
|YOS1‐2|Differential ‐‐ 0.010.1µmho
CMR
COMMONMODEREJECTION
‐20log|VGS1‐2/VDS|
‐‐
100
‐‐
dB
∆VDS=10to20VID=200µA
CMR‐20log|VGS1‐2/VDS|‐‐ 75 ‐‐ dB∆VDS=5to10VID=200µA
NF
NOISE
Figure
‐‐
‐‐
0.5
dB
VDS=20VVGS=0VRG=10MΩ
f=100HzNBW=6Hz
enVoltage ‐‐ ‐‐ 15nV/√HzVDS=20VID=200µAf=10HzNBW=1Hz
CISS
CAPACITANCE
Input
‐‐
‐‐
6
pF
VDS=20VVGS=0Vf=1MHz
CRSSReverseTransfer ‐‐ ‐‐ 2pF
CDDDrain‐to‐Drain ‐‐ 0.1 ‐‐ pFVDG=20VID=200µA
The 2N3956 is a Low Noise, Low Drift, Monolithic Dual N-Channel JFET
2N3956
MONOLITHIC DUAL
N-CHANNEL JFET
Note 1 – These ratings are limiting values above which the serviceability of any semiconductor may be impaired
2N3956 Applications:
Wideband Differential Amps
High Input Impedance Amplifiers
The 2N3956 family are matched JFET pairs for
differential amplifiers. The 2N3956 family of general
purpose JFETs is characterized for low and medium
frequency differential amplifiers requiring low offset
voltage, drift, noise and capacitance
The 2N3956 family also exhibits low capacitance - 6pF
max and a spot noise figure of -0.5dB max. The part
offers a superior tracking ability.
The hermetically sealed TO-71 and TO-78 packages
are well suited for high reliability and harsh environment
applications.
(See Packaging Information).
TO-71
/
TO-78 (Bottom View)
Available Packages:
2N3956 in TO-71 / TO-78
2N3956 available as bare die
Please contact Micross for full package and die dimensions
Micross Components Europe
Tel: +44 1603 788967
Email: chipcomponents@micross.com
Web: http://www.micross.com/distribution