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UNISONIC TECHNOLOGIES CO., LTD
K1109
N-CHANNEL JFET FOR
ELECTRET CONDENSER
MICROPHONE
N-CHANNEL JFET
DESCRIPTION
The UTC K1109 is N-channel JFET for electrets condenser
microphone.
FEATURES
* High GM Implies Low Transfer loss
* Built-In Gate-Source Diode and Resistor Implies Fast Power on
Settling Time
ORDERING INFORMATION
Ordering Number
K1109G-x-AE3-R
K1109G-x-AQ3-R
Note: Pin Assignment: S: Source D: Drain
G: Gate
Package
SOT-23
SOT-723
Pin Assignment
123
SDG
SDG
Packing
Tape Reel
Tape Reel
MARKING
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Copyright © 2014 Unisonic Technologies Co., Ltd
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K1109
N-CHANNEL JFET
ABSOLUTE MAXIMUM RATINGS (unless otherwise specified )
PARAMETER
SYMBOL
RATINGS
UNIT
Drain-Source Voltage
Gate-Drain Voltage
VDSX
VGDO
20
-20
V
V
Drain Current
Gate Current
ID
IG
10 mA
10 mA
Power Dissipation
Junction Temperature
PD
TJ
80
+125
mW
°C
Storage Temperature
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 (TJ=25°C, unless otherwise specified)
PARAMETER
Drain Current
Gate Off Voltage
Forward Transfer Admittance
Input Capacitance
Noise Voltage
SYMBOL
IDSS
VGS(OFF)
lYFSl
CISS
NV
TEST CONDITIONS
VDS=2.0V, VGS=0
VDS=5.0V, ID=1.0A
VDS=5.0V, VGS=0, f=1kHz
VDS=5.0V, VGS=0, f=1.0MHz
MIN TYP MAX UNIT
40 600 μA
-0.1 -1.0 V
600 1600
μS
7.0 8.0 pF
1.8 3.0 μV
CLASSIFICATION OF IDSS
RANK
RANGE
J32
40-70
J33
60-110
J34
90-180
J35
150-300
J36
200-450
J37
300-600
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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K1109
TEST CIRCUIT
N-CHANNEL JFET
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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K1109
TYPICAL CHARACTERISTICS
Drian Current vs Drain Source Voltage(J35)
600
0.15V
500
0.10V
400
0.05V
300
200
100
0
0
VGS=0V
-0.05V
-0.10V
-0.15V
2 46 8
Drain Source Voltage,VDS(V)
10
|YFS| - IDSS
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
150 200
250 300 350
Zero-Gate Voltage Drain Current,IDSS-uA
N-CHANNEL JFET
Power Dissipatio vs Ambient Temperature
100
75
50
25
0
0
25 50 75 100
Ambient Temperature, TA ( )
125
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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