LS4391
Single N-Channel JFET switch
Linear Systems replaces discontinued Siliconix 2N4391
FEATURES
The LS4391 features many of the superior
DIRECT REPLACEMENT FOR SILICONIX 2N4391
LOW ON RESISTANCE
characteristics of JFETs which make it a good choice
for demanding analog switching applications and for
specialized amplifier circuits.
rDS(on) ≤ 30Ω
ID(off) = 5pA
t(ON) ≤= 15ns
LOW GATE OPERATING CURRENT
FAST SWITCHING
LS4391 Benefits:
ABSOLUTE MAXIMUM RATINGS1 @ 25°C (unless otherwise noted)
Low Error Voltage
Maximum Temperatures
Storage Temperature
Operating Junction Temperature
Maximum Power Dissipation
Continuous Power Dissipation
MAXIMUM CURRENT
Gate Current (Note 1)
MAXIMUM VOLTAGES
Gate to Drain Voltage / Gate to Source Voltage
High-Speed Analog Circuit Performance
Negligible “Off-Error,” Excellent Accuracy
Good Frequency Response, Low Glitches
Eliminates Additional Buffering
‐65°C to +200°C
‐55°C to +200°C
1800mW
IG = 50mA
‐40V
LS4391 Applications:
Analog Switches
Choppers, Sample-and-Hold
Normally “On” Switches, Current Limiters
LS4391 ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
BVGSS
VGS(off)
VGS(F)
VDS(on)
VDS(on)
VDS(on)
IDSS
CHARACTERISTIC
Gate to Source Breakdown Voltage
Gate to Source Cutoff Voltage
Gate to Source Forward Voltage
Drain to Source On Voltage
Drain to Source On Voltage
Drain to Source On Voltage
Drain to Source Saturation Current2
Gate Reverse Current
MIN
‐40
‐4
‐‐
‐‐
‐‐
‐‐
50
‐‐
‐‐
‐‐
TYP.
‐‐
‐‐
0.7
0.25
0.3
0.35
‐‐
MAX
‐‐
‐10
1
‐‐
‐‐
0.4
150
‐100
‐‐
UNITS
V
CONDITIONS
IG = ‐1µA, VDS = 0V
VDS = 20V, ID = 1nA
IG = 1mA, VDS = 0V
VGS = 0V, ID = 3mA
VGS = 0V, ID = 6mA
VGS = 0V, ID = 12mA
VDS = 20V, VGS = 0V
VGS = ‐20V, VDS = 0V
VDG = 15V, ID = 10mA
mA
pA
IGSS
IG
‐5
‐5
5
Gate Operating Current
‐‐
VDS = 20V, VGS = ‐5V
ID(off)
Drain Cutoff Current
‐‐
‐‐
‐‐
5
5
‐‐
‐‐
100
30
VDS = 20V, VGS = ‐7V
VDS = 20V, VGS = ‐12V
VGS = 0V, ID = 1mA
rDS(on)
Drain to Source On Resistance
Ω
LS4391 DYNAMIC ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
CHARACTERISTIC
TYP
MIN
MAX
UNITS
CONDITIONS
Click To Buy
gfs
Forward Transconductance
6
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
‐‐
mS
µS
Ω
VDS = 20V, ID = 1mA, f = 1kHz
VDS = 20V, ID = 1mA, f = 1kHz
VGS = 0V, ID = 0A, f = 1kHz
gos
Output Conductance
25
‐‐
‐‐
rds(on)
Ciss
Drain to Source On Resistance
Input Capacitance
30
14
‐‐
12
3.3
3.2
2.8
3
VDS = 20V, VGS = 0V, f = 1MHz
VDS = 0V, VGS = ‐5V, f = 1MHz
VDS = 0V, VGS = ‐7V, f = 1MHz
VDS = 0V, VGS = ‐12V, f = 1MHz
VDS = 10V, ID = 10mA, f = 1kHz
Crss
pF
Reverse Transfer Capacitance
Crss
‐‐
Crss
3.5
en
Equivalent Input Noise Voltage
‐‐
nV/√Hz
LS4391 SWITCHING ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)
SYMBOL
td(on)
tr
CHARACTERISTIC
TYP
2
MIN
‐‐
MAX
15
5
UNITS
CONDITIONS
Turn On Time
2
‐‐
ns
VDD = 10V, VGS(H) = 0V
td(off)
tf
6
‐‐
20
15
Turn Off Time
13
‐‐
Notes: 1. Absolute ratings are limiting values above which serviceability may be impaired
2. Pulse test: PW ≤ 300µs, Duty Cycle ≤ 3%
LS4391 SWITCHING CIRCUIT PARAMETERS
SWITCHING CIRCUIT
VGS(L)
RL
‐12V
800Ω
12mA
TO-18 (Bottom View)
Micross Components Europe
ID(on)
Available Packages:
Tel: +44 1603 788967
Email: chipcomponents@micross.com
Web: http://www.micross.com/distribution
LS4391 in TO-18
LS4391 in bare die.
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.
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