Datasheet

UNISONIC TECHNOLOGIES CO., LTD
K1109
N-CHANNEL JFET
N-CHANNEL JFET FOR
ELECTRET CONDENSER
MICROPHONE

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

Package
SOT-23
SOT-723
Pin Assignment
1
2
3
S
D
G
S
D
G
Packing
Tape Reel
Tape Reel
G: Gate
MARKING
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K1109

N-CHANNEL JFET
ABSOLUTE MAXIMUM RATINGS (unless otherwise specified )
PARAMETER
SYMBOL
RATINGS
UNIT
Drain-Source Voltage
VDSX
20
V
Gate-Drain Voltage
VGDO
-20
V
Drain Current
ID
10
mA
Gate Current
IG
10
mA
Power Dissipation
PD
80
mW
Junction Temperature
TJ
+125
°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=1.0A
VDS=5.0V, VGS=0, f=1kHz
VDS=5.0V, VGS=0, f=1.0MHz
MIN
40
-0.1
600
TYP
MAX UNIT
600
μA
-1.0
V
1600
μS
7.0
8.0
pF
1.8
3.0
μV
CLASSIFICATION OF IDSS
RANK
RANGE
J32
40-70
J33
60-110
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
J34
90-180
J35
150-300
J36
200-450
J37
300-600
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QW-R206-009.O
K1109

N-CHANNEL JFET
TEST CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
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K1109
N-CHANNEL JFET
TYPICAL CHARACTERISTICS
Drian Current vs Drain Source Voltage(J35)
600
0.15V
Drain Current,ID(uA)
500
0.10V
400
0.05V
300
VGS=0V
200
-0.05V
-0.10V
-0.15V
100
0
2
0
4
6
8
10
Drain Source Voltage,VDS(V)
Power Dissipatio vs Ambient Temperature
Allowable power dissipation,PC(mW)

100
75
50
25
0
0
25
50
75
100
125
Ambient Temperature, TA ( )
|YFS| - IDSS
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
350
200
150
250
300
Zero-Gate Voltage Drain Current,IDSS-uA
100
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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