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E94610B83-TE
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any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
Absolute Maximum Ratings (Ta=25 °C)
• Reverse voltage VR 34 V
• Operating temperature
Topr –20 to +75 °C
• Storage temperature
Tstg –65 to +150 °C
Description
The 1T397 is a variable capacitance diode
designed for the electronic tuning of wide band
CATV tuners, and it has a super miniature package.
Features
• Super miniature package
• Large capacitance ratio C2/C25=14.5 Min.
C1/C28=21.5 Min.
C25/C28=1.03 Min.
• Small series resistance rs=1.1 Ω Max.
• High reverse voltage VR=34 V
Structure
Silicon epitaxial planar-type diode
Variable Capacitance Diode
M-235
1T397
Electrical Characteristics (Ta=25 °C)
Item
Reverse current
Reverse voltage
Diode capacitance
Capacitance ratio
Series resistance
Capacitance deviation in a
matching group
Symbol
IR
VR
C2
C25
C2/C25
C1/C28
C25/C28
rs
∆C
Conditions
VR=28 V
IR=1 µA
VR=2 V, f=1 MHz
VR=25 V, f=1 MHz
CD=14 pF, f=470 MHz
VR=1 to 28 V
Min. Typ. Max. Unit
10 nA
34 V
42.9 51.0 pF
2.60 3.03 pF
14.5 15.5
21.5
1.03
1.1 Ω
2.0 %
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1T397
Diode capacitance vs. Reverse voltage temperature
Ta=25°C
100
10
1
C-Diode capacitance (pF)
VR - Reverse voltage temperature
1 10 50
V
F
Forward voltage (V)
0.90
0.80
0.70
0.60
–20 0 20 40 60 80
I
F=1mA
2 5 20
2
5
20
50
V
R
- Reverse voltage (V)
50
45
40
35
30
-20 0 20 40 60
I
R=10µA
Reverse current vs. Ambient temperature
Ta - Ambient temperature (°C)
IR Reverse current (nA)
VR=28V
1.000
0.100
0.010
0.001
–20 0 20 40 60
Ta - Ambient temperature (°C)
Reverse voltage vs. Ambient temperature
Ta - Ambient temperature (°C)
Forward voltage vs. Ambient temperature
80
80
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1T397
Diode capacitance vs. Ambient temperature
Diode capacitance
C (Ta)
C (25°C)
–20 0 20 40 60 80
1.03
1.02
1.01
1.00
0.99
0.98
V
R=1V
V
R=2V
V
R=7V
V
R=15V
V
R=25V
Reverse current vs. Reverse voltage
IR - Reverse current (nA)
0.100
0.010
0.001
0.0001
1 10 50
Ta=60°C
Ta=25°C
2 5 20
Ta=80°C
Thermal coeffcient of diode capacitance vs. Reverse voltage
VR - Reverse voltage (V)
Thermal coeffcient of diode capacitance (ppm/°C)
1000
100
50
1 102 5 20
200
500
Ta - Ambient temperature (°C)
V
R - Reverse voltage(V)
50
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Package Outline Unit : mm
AAA
M-235
AAA
1T397
∗1.25
2
1
+ 0.2
– 0.1
0.3
0.3
+ 0.1
– 0.05
∗0.9 ± 0.1
+ 0.1
– 0.05
2.5 ± 0.2
∗1.7 ± 0.1
NOTE: Dimension “∗” does not include mold protrusion.
0.2
0.11
+ 0.1
– 0.06
0 ± 0.05
0° to 10°
Marking
SONY CODE
EIAJ CODE
JEDEC CODE
M-235
CATHODE MARK
2
97
B
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PACKAGE WEIGHT
Notes
1) B:Lot No.(Year and Month of manufacture)
Year;Last one digit
Month;A,B,C(for Oct. to Dec.)
0.1g
1 to 9(for Jan.to Sept.)
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