Datasheet

UNISONIC TECHNOLOGIES CO., LTD
K4059
Preliminary
N-CHANNEL JFET
FIELD EFFECT TRANSISTOR
SILICON N CHANNEL
JUNCTION TYPE

DESCRIPTION
The UTC K4059 is an N-channel JFET, it uses UTC’s advanced
technology to provide customers with low input capacitance and low
forward transfer admittance.

FEATURES
* Low forward transfer admittance
* Low input capacitance

EQUIVALENT CIRCUIT

ORDERING INFORMATION
Ordering Number
K4059G-x-AQ3-R
Note: Pin Assignment: S: Source
D: Drain

Package
SOT-723
Pin Assignment
1
2
3
S
D
G
Packing
Tape Reel
G: Gate
MARKING
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Copyright © 2014 Unisonic Technologies Co., Ltd
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QW-R228-001.b
K4059

Preliminary
N-CHANNEL JFET
ABSOLUTE MAXIMUM RATINGS ( TA=25C ,unless otherwise specified )
PARAMETER
SYMBOL
RATINGS
UNIT
Gate-Drain Voltage
VGDO
-20
V
Gate-Current
IG
10
mA
Drain Power Dissipation (TA=25°C)
PD
100
mW
Junction Temperature
TJ
125
°C
Storage Temperature Range
TSTG
-55~125
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS ( TA=25C ,unless otherwise specified )
PARAMETER
SYMBOL
Drain Current
IDSS
Drain Current
ID
Gate-Drain Voltage
Gate-Source Cut-Off Voltage
Forward Transfer Admittance
Input Capacitance
Voltage Gain
V(BR)GDO
VGS (OFF)
|Yfs|
CISS
GV
Delta Voltage Gain
∆GV(f)
Delta Voltage Gain
∆GV(V)
Noise Voltage
Total Harmonic Distortion
Time Output Stability

VN
THD
tOS
TEST CONDITIONS
K4059-A
VGS=0, VDS=2V
K4059-B
K4059-C
K4059-A
VDD=2V, RL=2.2kΩ,
K4059-B
Cg=5pF
K4059-C
IG=-10µA
VDS=2V, ID=1µA
VDS=2V, VGS=0V
VDS=2V, VGS=0, f=1MHz
K4059-A
VDD=2V,RL=2.2kΩ,
Cg=5pF, f=1kHz,
K4059-B
VIN=100mV
K4059-C
VDD=2V, RL=2.2kΩ, Cg=5pF,
f=1kHz~100Hz, VIN=100mV
VDD=2V~1.5V,RL=2.2kΩ, K4059-A
Cg=5pF, f=1kHz,
K4059-B
VIN=100mV
K4059-C
K4059-A
VDD=2V, RL=1kΩ,
Cg=10pF, GV=80dB,
K4059-B
A-Curve Filter
K4059-C
K4059-A
VDD=2V, RL=2.2kΩ,
Cg=5pF, f=1kHz,
K4059-B
VIN =50mV
K4059-C
VDD=2V, RL=2.2kΩ, Cg=5pF
MIN TYP MAX UNIT
140
240 µA
210
350 µA
320
500 µA
125
260 µA
190
370 µA
290
500 µA
-20
V
-0.1
-1.0
V
1.35 1.85
mS
4.0
pF
-1.2 +0.9
dB
-0.2 +1.4
dB
+0.5 +1.8
dB
0
-1
dB
-0.6
-0.8
-1.4
33
38
42
1.3
0.6
0.1
100
-1.1
-1.7
-3.2
75
80
90
dB
dB
dB
mV
mV
mV
%
%
%
ms
200
CLASSIFICATION OF IDSS
RANK
RANGE
A
140-240
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
B
210-350
C
320-500
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QW-R228-001.b
K4059
N-CHANNEL JFET
2.2kΩ
TEST CIRCUIT
5pF

Preliminary
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R228-001.b
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