2N4118A
N-CHANNEL JFET
Linear Systems replaces discontinued Siliconix 2N4118A
The 2N4118A is an Ultra-High Input Impedance N-Channel JFET
The 2N4118A provides ultra-high input impedance. The
device is specified with a 1-pA limit and typically
operates at 0.2 pA. The part is ideal for use as a high-
impedance sensitive front-end amplifier.
FEATURES
DIRECT
REPLACEMENT
FOR
SILICONIX
2N4118A
LOW
POWER
MINIMUM
CIRCUIT
LOADING
ABSOLUTE
MAXIMUM
RATINGS
@
25°C
(unless
otherwise
noted)
Maximum
Temperatures
Storage
Temperature
Operating
Junction
Temperature
Maximum
Power
Dissipation
Continuous
Power
Dissipation
MAXIMUM
CURRENT
Gate
Current
(Note
1)
MAXIMUM
VOLTAGES
Gate
to
Drain
or
Gate
to
Source
(Note
2)
I
DSS
<90
µA
I
GSS
<1
pA
2N4118A Benefits:
Insignificant Signal Loss / Error Voltage
with High-Impedance Source
Low Power Consumption (Battery)
Maximum Signal Output, Low Noise
High Sensitivity to Low-Level Signals
-‐65°C
to
+175°C
-‐55°C
to
+150°C
300mW
50mA
-‐40V
2N4118A Applications:
High-Impedance Transducer
Smoke Detector Input
Infrared Detector Amplifier
Precision Test Equipment
2N4118A
ELECTRICAL
CHARACTERISTICS
@
25°C
(unless
otherwise
noted)
SYMBOL
CHARACTERISTIC
MIN
TYP.
MAX
UNITS
CONDITIONS
BV
GSS
Gate
to
Source
Breakdown
Voltage
-‐40
-‐-‐
-‐-‐
V
I
G
=
-‐1µA,
V
DS
=
0V
V
GS(off)
Gate
to
Source
Cutoff
Voltage
-‐1
-‐-‐
-‐3
V
V
DS
=
10V,
I
D
=
1nA
I
DSS
Gate
to
Source
Saturation
Current
0.08
-‐-‐
0.24
mA
V
DS
=
10V,
V
GS
=
0V
I
GSS
Gate
Leakage
Current
-‐-‐
-‐-‐
-‐1
pA
V
GS
=
-‐20V,
V
DS
=
0V
-‐-‐
-‐-‐
-‐2.5
V
GS
=
-‐20V,
V
DS
=
0V,
150°C
g
fs
Forward
Transconductance(Note
3)
80
-‐-‐
250
µmho
V
DS
=
10V,
V
GS
=
0V,
f
=
1kHz
g
os
Output
Conductance
-‐-‐
-‐-‐
5
C
iss
Input
Capacitance
-‐-‐
-‐-‐
3
pF
V
DS
=
10V,
V
GS
=
0V,
f
=
1MHz
C
rss
Reverse
Transfer
Capacitance
-‐-‐
-‐-‐
1.5
1
.
Absolute
maximum
ratings
are
limiting
values
above
which
2N4118A
serviceability
may
be
impaired.
NOTES
2.
Due
to
symmetrical
geometry,
these
units
may
be
operated
with
source
and
drain
leads
interchanged
3.
This
parameter
is
measured
during
a
2ms
interval
100ms
after
power
is
applied.
(Not
a
JEDEC
condition.)
Micross Components Europe
Available Packages:
2N4118A in TO-72
2N4118A in bare die.
TO-72 (Bottom View)
Tel: +44 1603 788967
Email:
chipcomponents@micross.com
Web:
http://www.micross.com/distribution
Please contact Micross for full
package and die dimensions
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.
Micross Components Ltd, United Kingdom, Tel: +44 1603 788967, Fax: +44 1603788920, Email:
chipcomponents@micross.com
Web:
www.micross.com/distribution.aspx
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