J108
N-CHANNEL JFET
Linear Systems replaces discontinued Siliconix J108
This n-channel JFET is optimised for low noise high
performance switching. The part is particularly suitable
for use in low noise audio amplifiers. The hermetically
sealed TO-18 package is well suited for hi-reliability and
harsh environment applications.
(See Packaging Information).
FEATURES
DIRECT REPLACEMENT FOR SILICONIX J108
LOW ON RESISTANCE
r
DS(on)
≤ 8Ω
FAST SWITCHING
t
(on)
≤ 4ns
ABSOLUTE MAXIMUM RATINGS @ 25°C (unless otherwise noted)
Maximum Temperatures
Storage Temperature
‐55°C to +150°C
J108 Benefits:
Operating Junction Temperature
‐55°C to +150°C
Low On Resistance
Maximum Power Dissipation
Low insertion loss
Continuous Power Dissipation
350mW
Low Noise
MAXIMUM CURRENT
J108 Applications:
Gate Current (Note 1)
50mA
Analog Switches
MAXIMUM VOLTAGES
Commutators
Gate to Drain Voltage
V
GDS
= ‐25V
Choppers
Gate to Source Voltage
V
GSS
= ‐25V
J108 ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTIC
MIN
TYP.
MAX
UNITS
CONDITIONS
BV
GSS
Gate to Source Breakdown Voltage
‐25
‐‐
‐‐
I
G
= 1µA, V
DS
= 0V
V
GS(off)
Gate to Source Cutoff Voltage
‐3
‐‐
‐10
V
DS
= 5V, I
D
= 1µA
V
V
GS(F)
Gate to Source Forward Voltage
‐‐
0.7
‐‐
I
G
= 1mA, V
DS
= 0V
I
DSS
Drain to Source Saturation Current (Note 2)
80
‐‐
‐‐
mA
V
DS
= 15V, V
GS
= 0V
I
GSS
Gate Reverse Current
‐‐
‐0.01
‐3
V
GS
= ‐15V, V
DS
= 0V
nA
I
G
Gate Operating Current
‐‐
‐0.01
‐‐
V
DG
= 10V, I
D
= 10mA
I
D(off)
Drain Cutoff Current
‐‐
0.02
3
V
DS
= 5V, V
GS
= ‐10V
r
DS(on)
Drain to Source On Resistance
‐‐
‐‐
8
Ω
V
GS
= 0V, V
DS
≤ 0.1V
J108 DYNAMIC ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTIC
MIN
TYP.
MAX
UNITS
CONDITIONS
g
fs
Forward Transconductance
‐‐
17
‐‐
mS
V
DS
= 5V, I
D
= 10mA , f = 1kHz
g
os
Output Conductance
‐‐
0.6
‐‐
r
DS(on)
Drain to Source On Resistance
‐‐
‐‐
8
Ω
V
GS
= 0V, I
D
= 0A, f = 1kHz
C
iss
Input Capacitance
‐‐
60
85
V
DS
= 0V, V
GS
= 0V, f = 1MHz
pF
C
rss
Reverse Transfer Capacitance
‐‐
11
15
V
DS
= 0V, V
GS
= ‐10V, f = 1MHz
e
n
Equivalent Noise Voltage
‐‐
3.5
‐‐
nV/√Hz
V
DS
= 5V, I
D
= 10mA , f = 1kHz
J108 SWITCHING CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTIC
UNITS
CONDITIONS
Click To Buy
Turn On Time
Turn On Rise Time
Turn Off Time
Turn Off Fall Time
3
1
4
18
ns
V
DD
= 1.5V
V
GS
(H) = 0V
See Switching Circuit
Available Packages:
J108 in TO-18
J108 in bare die.
Please contact Micross for full
package and die dimensions
TO-18 (Bottom View)
t
d(on)
t
r
t
d(off)
t
f
Note 1 ‐ Absolute maximum ratings are limiting values above which J108 serviceability may be impaired. Note 2 – Pulse test: PW≤ 300 µs, Duty Cycle ≤ 3%
J108 SWITCHING CIRCUIT PARAMETERS
‐12V
R
L
150Ω
I
D(on)
10mA
Micross Components Europe
V
GS(L)
SWITCHING TEST CIRCUIT
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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