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U1897 SERIES
N-Channel JFET
~wrSini
liconix
corporatec
The U1897 Series is a mUlti-purpose n-channel JFET
designed to economically enhance circuit
performance. These devices are especially well
suited for analog switching applications but function
efficiently as high-gain amplifiers, particularly at
high-frequency. Our low-cost TO-92 packaging
offers affordable performance with flexibility for
designers, as these devices can be ordered with a
variety of lead forms or tape and reel for automated
insertion. (See Section 8.)
For additional design information please consult the
typical performance curves NCB which are located
in Section 7.
Vas (OFF) rds(ON) IO(OFF)
PART
NUMBER
MAX
(V)
MAX
(n)
MAX
(pA)
U1897
-10 30 200
U1898
-7 50 200
U1899
-5 80 200
tON
MAX
(ns)
25
35
60
TO-92
BOTTOM VIEW
SIMILAR PRODUCTS
• TO-18, See 2N4091 Series
• SOT-23, See SST4091 Series
• Duals, See 2N5564Series
• Chips, Order U189XCHP
1 DRAIN
2 SOURCE
3 GATE
ABSOLUTE MAXIMUM RATINGS (TA = 25°C unless otherwise noted)
PARAMETERS/TEST CONDITIONS
SYMBOL
LIMIT
UNITS
Gate-Drain Voltage
Gate-Source Voltage
Gate Current
Power Dissipation
Power Derating
Operating Junction Temperature
Storage Temperature
Lead Temperature
(1/16" from case for 10 seconds)
Vao
Vas
IG
Po
TJ
Tstg
TL
-40
-40
10
360
3.27
-55 to 135
-55 to 150
300
V
mA
mW
mW/oC
°C
4-174

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~Siliconix
~ incorporated
U1897 SERIES
ELECTRICAL CHARACTERISTICS 1
U1897
LIMITS
U1898
U1899
PARAMETER
SYMBOL
TEST CONDITIONS
TVP2 MIN MAX MIN MAX MIN MAX UNIT
STATIC
Gate-Source
Breakdown Voltage
Gate-Source
Cutoff Voltage
Saturation Drain
Current 3
V(BR)GSS
VGS(OFF)
loss
Gate Reverse Current IGSS
Gate Operating
Current
IG
Drain Cutoff Current 10(OFF)
Drain-Source
On-Voltage
Drain-Source
On-Resistance
Gate-Source
Forward Voltage
VOS(ON)
rOS(ON)
VGS(F)
IG =-ljJ.A.Vos=OV
Vos = 20 V. 10 = 1 nA
-55 -40
-40 -40
V
-5 -10 -2 -7 -1 -5
Vos = 20 V. VGS = 0 V
30 15 6 mA
VGS = -20 V
Vos = 0 V
TA = 65°C
VOG=15V.10 = 10 mA
-5
-0.2
-5
-400
-400
-400 pA
nA
VGS = -6 V 5
200 pA
Vos = 20 V
VGS = -6 V
5
200
VGS = -12 V 5
200
VGS = -6 V 0.2
10
Vos = 20 V
TA = 65°C
VGS = -6 V 0.2
VGS = -12 V 0.2
10
10
nA
10 = 2.5 mA 0.15
0.2
VGS = 0 V
10 = 4 mA 0.15
0.2 V
10 = 6.6 mA 0.15
0.2
VGS = 0 V. 10 = 1 mA
30 50 60 .0.
I G = 1 mAo V DS = 0 V
0.7
V
DYNAMIC
Common-Source
Forward
Transconductance
Common-Source
Output Conductance
gfs
gos
VOG=20V.10=lmA
f = 1 kHz
6
25
mS
jJ.S
Drain-Source
On-Resistance
rds(ON)
VGS = 0 V. 10 = 0 mA
f = 1 kHz
30 50 60 .0.
Common-Source
Input Capacitance
Clss
14 16 16 16
Common-Source
Reverse Transfer
Caoacltance
Crss
V DS = 20 V. VGS = 0 V
f = 1 MHz
3
pF
3.5 3.5 3.5
Equivalent Input
Noise Voltage
en VOG = 10 V. 10 = 10 mA
3
f = 1 kHz
~VHZ
SWITCHING
td(ON)
Voo = 3 V. VGS(ON) = 0 V
2
15
15
20
Turn-on Time
tr
PIN 10(oN) VGS(OFF) RL
2
10 20
40
U1697 6.6 mA -12 V 430.0.
ns
Turn-off Time
t OFF U1696
4mA -6 V 700.0. 19
40
60
60
U1699 2.5 mA -6 V 1100.0.
NOTES: 1. T A = 25 ° C unless otherwise noted.
2. For design aid only. not subject to production testing.
3. Pulse test; PW =300jJ.s. duty cycle S3%.
4-175