U425
HIGH INPUT IMPEDANCE
MONOLITHIC DUAL
N-CHANNEL JFET
Linear Systems replaces discontinued Siliconix U425
The U425 is a high input impedance Monolithic Dual N-Channel JFET
The U425 monolithic dual n-channel JFET is designed
to provide very high input impedance for differential
amplification and impedance matching. Among its
many unique features, this series offers operating gate
current specified at -500 fA. The U425 is a direct
replacement for discontinued Siliconix U425.
The hermetically sealed TO-71 & TO-78 packages are
well suited for military applications. The 8 Pin P-DIP
and 8 Pin SOIC provide ease of manufacturing, and the
symmetrical pinout prevents improper orientation.
(See Packaging Information).
FEATURES
HIGH INPUT IMPEDANCE
HIGH GAIN
LOW POWER OPERATION
ABSOLUTE MAXIMUM RATINGS
@ 25°C (unless otherwise noted)
I
G
= 0.25pA MAX
gfs = 120µmho MIN
V
GS(OFF)
= 2V MAX
U425 Applications:
Ultra Low Input Current Differential Amps
High-Speed Comparators
Impedance Converters
Maximum Temperatures
Storage Temperature
‐65°C to +150°C
Operating Junction Temperature
+150°C
Maximum Voltage and Current for Each Transistor – Note 1
‐V
GSS
Gate Voltage to Drain or Source
40V
‐V
DSO
Drain to Source Voltage
40V
‐I
G(f)
Gate Forward Current
10mA
Maximum Power Dissipation
Device Dissipation @ Free Air – Total 400mW @ +125°C
MATCHING CHARACTERISTICS @ 25°C UNLESS OTHERWISE NOTED
SYMBOL
CHARACTERISTICS VALUE UNITS CONDITIONS
|∆V
GS1‐2
/∆T|max.
DRIFT VS.
25
µV/°C V
DG
=10V, I
D
=30µA
TEMPERATURE
T
A
=‐55°C to +125°C
| V
GS1‐2
| max.
OFFSET VOLTAGE
15
mV
V
DG
=10V, I
D
=30µA
TYP.
60
‐‐
‐‐
200
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
0.1
90
90
‐‐
20
10
‐‐
‐‐
MAX.
‐‐
‐‐
1500
350
1000
2.0
1.8
.25
250
1.0
1.0
10
3.0
‐‐
‐‐
1
70
‐‐
3.0
1.5
UNITS
V
V
µmho
µmho
µA
V
V
pA
pA
pA
nA
µmho
µmho
dB
dB
dB
nV/√Hz
pF
pF
CONDITIONS
V
DS
= 0 I
G
=1nA
I
G
= 1µA I
D
= 0 I
S
= 0
V
DS
= 10V V
GS
= 0V f = 1kHz
V
DG
= 10V I
D
= 30µA f = 1kHz
V
DS
= 10V V
GS
= 0V
V
DS
= 10V I
D
= 1nA
V
DG
= 10V I
D
= 30µA
V
DG
= 10V I
D
= 30µA
T
A
= +125°C
V
DS
= 0V V
GS
= 20V
T
A
= +125°C
V
DS
= 10V V
GS
= 0V
V
DG
= 10V I
D
= 30µA
∆V
DS
= 10 to 20V I
D
= 30µA
∆V
DS
= 5 to 10V I
D
= 30µA
V
DG
= 10V I
D
= 30µA R
G
= 10MΩ
f = 10Hz
V
DG
= 10V I
D
= 30µA f = 10Hz
V
DG
= 10V I
D
= 30µA f = 1KHz
V
DS
= 10V V
GS
= 0 f = 1MHz
P-DIP / SOIC (Top View)
ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTICS
MIN.
BV
GSS
Breakdown Voltage
40
BV
GGO
Gate‐To‐Gate Breakdown
40
TRANSCONDUCTANCE
Y
fSS
Full Conduction
300
Y
fS
Typical Operation
120
DRAIN CURRENT
I
DSS
Full Conduction
60
GATE VOLTAGE
V
GS(off)
Pinchoff voltage
‐‐
V
GS
Operating Range
‐‐
GATE CURRENT
I
G
max.
Operating
‐‐
‐I
G
max.
High Temperature
‐‐
I
GSS
max.
At Full Conduction
‐‐
‐I
GSS
max.
High Temperature
‐‐
OUTPUT CONDUCTANCE
Y
OSS
Full Conduction
‐‐
Y
OS
Operating
‐‐
COMMON MODE REJECTION
CMR
‐20 log | ∆V
GS1‐2
/ ∆V
DS
|
‐‐
‐20 log | ∆V
GS1‐2
/ ∆V
DS
|
‐‐
NOISE
NF
Figure
‐‐
e
n
Voltage
‐‐
‐‐
CAPACITANCE
C
ISS
Input
‐‐
C
RSS
Reverse Transfer
‐‐
Click To Buy
Note 1 – These ratings are limiting values above which the serviceability of any semiconductor may be impaired
TO-71 / TO-78 (Top View)
Available Packages:
U425 in TO-71 & TO-78
U425 in PDIP & SOIC
U425 available as bare die
Please contact
Micross
for full package and die dimensions
Email:
chipcomponents@micross.com
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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