2N3956
MONOLITHIC DUAL
N-CHANNEL JFET
The 2N3956 is a Low Noise, Low Drift, Monolithic Dual N-Channel JFET
FEATURES
LOW DRIFT
LOW LEAKAGE
LOW NOISE
ABSOLUTE MAXIMUM RATINGS
@ 25°C (unless otherwise noted)
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
|∆ VGS1‐2 /∆T|= 5µV/°C max.
IG = 20pA TYP.
en = 10nV/√Hz TYP.
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.
Maximum Temperatures
Storage Temperature
‐65°C to +200°C
Operating Junction Temperature
Maximum Voltage and Current for Each Transistor – Note 1
+150°C
The hermetically sealed TO-71 and TO-78 packages
are well suited for high reliability and harsh environment
applications.
‐VGSS
‐VDSO
‐IG(f)
Gate Voltage to Drain or Source
Drain to Source Voltage
Gate Forward Current
60V
60V
50mA
(See Packaging Information).
Maximum Power Dissipation
Device Dissipation @ Free Air – Total
400mW @ 25°C
2N3956 Applications:
MATCHING CHARACTERISTICS @ 25°C UNLESS OTHERWISE NOTED
SYMBOL
| V GS1‐2 / T| max.
CHARACTERISTICS VALUE UNITS CONDITIONS
Wideband Differential Amps
High Input Impedance Amplifiers
DRIFT VS.
50
µV/°C
VDG=20V, ID=200µA
TA=‐55°C to +125°C
VDG=20V, ID=200µA
TEMPERATURE
| V GS1‐2 | max.
OFFSET VOLTAGE
15
mV
ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
BVGSS
BVGGO
CHARACTERISTICS
Breakdown Voltage
Gate‐To‐Gate Breakdown
TRANSCONDUCTANCE
Full Conduction
MIN.
60
60
TYP.
‐‐
‐‐
MAX.
‐‐
‐‐
UNITS
V
V
CONDITIONS
VDS = 0
I G= 1nA
ID=1µA
ID= 0
IS= 0
YfSS
YfS
|YFS1‐2 / Y FS|
1000
500
‐‐
2000
700
0.6
3000
1000
3
µmho
µmho
%
VDG= 20V
VDG= 20V
VGS= 0V f = 1kHz
ID= 200µA
Typical Operation
Mismatch
DRAIN CURRENT
Full Conduction
IDSS
|IDSS1‐2 / IDSS
0.5
‐‐
2
1
5
5
mA
%
VDG= 20V
VGS= 0V
|
Mismatch at Full Conduction
Click To Buy
GATE VOLTAGE
VGS(off) or Vp
VGS(on)
Pinchoff voltage
Operating Range
GATE CURRENT
Operating
1
0.5
2
‐‐
4.5
4
V
V
VDS= 20V
VDS=20V
ID= 1nA
ID=200µA
‐IG
‐IG
‐IG
‐‐
‐‐
‐‐
‐‐
20
‐‐
5
50
50
‐‐
pA
nA
pA
pA
VDG= 20V
TA= +125°C
ID= 200µA
High Temperature
Reduced VDG
VDG= 10V
VDG= 20V
ID= 200µA
VDS= 0
‐IGSS
At Full Conduction
OUTPUT CONDUCTANCE
Full Conduction
Operating
‐‐
100
YOSS
YOS
|YOS1‐2
‐‐
‐‐
‐‐
‐‐
0.1
0.01
5
1
0.1
µmho
µmho
µmho
VDG= 20V
VDG= 20V
VGS= 0V
ID= 200µA
|
Differential
COMMON MODE REJECTION
‐20 log | VGS1‐2/ VDS|
‐20 log | VGS1‐2/ VDS|
NOISE
CMR
CMR
‐‐
‐‐
100
75
‐‐
‐‐
dB
dB
∆VDS = 10 to 20V
∆VDS = 5 to 10V
VDS= 20V VGS= 0V
f= 100Hz NBW= 6Hz
VDS=20V ID=200µA f=10Hz NBW=1Hz
ID=200µA
ID=200µA
RG= 10MΩ
NF
en
Figure
Voltage
‐‐
‐‐
‐‐
‐‐
0.5
15
dB
nV/√Hz
CAPACITANCE
Input
Reverse Transfer
Drain‐to‐Drain
CISS
CRSS
CDD
‐‐
‐‐
‐‐
‐‐
‐‐
0.1
6
2
‐‐
pF
pF
pF
VDS= 20V
VGS= 0V
f= 1MHz
VDG= 20V
ID= 200µA
Note 1 – These ratings are limiting values above which the serviceability of any semiconductor may be impaired
TO-71 / TO-78 (Bottom View)
Micross Components Europe
Available Packages:
2N3956 in TO-71 / TO-78
2N3956 available as bare die
Please contact Micross for full package and die dimensions
Tel: +44 1603 788967
Email: chipcomponents@micross.com
Web: http://www.micross.com/distribution
Information furnished by Linear Integrated Systems and Micross Components is believed to be accurate and reliable. However, no responsibility is assumed for its use; nor for any infringement of patents or
other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Linear Integrated Systems.
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