Sony 1T397 Datasheet
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E94610B83-TE
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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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