Description
The 1T408 is a variable capacitance diode designed
for electronic tuning of wide-band CATV tuners using
a super-small-miniature flat package (SSVC).
Features
Super-small-miniature flat package
Small series resistance
0.75
Max. (f = 470MHz)
Large capacitance ratio
11.7 Typ. (C
2
/C
25
)
18.0 Typ. (C
1
/C
28
)
Small leakage current
10nA Max. (V
R
= 28V)
Capacitance deviation in a matching group: within 2%
Applications
Electronic tuning of wide-band CATV tuners
Structure
Silicon epitaxial planar-type diode
Absolute Maximum Ratings (Ta = 25C)
Reverse voltage
V
R
34
V
Operating temperature
Topr
20 to +75
C
Storage temperature
Tstg
65 to +150
C
1
1T408
E97522-PS
Variable Capacitance Diode
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
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.
M-290
Item
Reverse current
Diode capacitance
Capacitance ratio
Series resistance
Capacitance deviation
in a matching group
I
R
C
2
C
25
C
2
/C
25
C
25
/C
28
rs
C
V
R
= 28V
V
R
= 2V, f = 1MHz
V
R
= 25V, f = 1MHz
C
D
= 14pF, f = 470MHz
V
R
= 2 to 25V, f = 1MHz
11.7
29.46
2.49
11.0
1.03
10
35.46
2.89
0.75
2
nA
pF
pF
%
Symbol
Conditions
Typ.
Min.
Max.
Unit
Electrical Characteristics
(Ta = 25C)
2
1T408
Diode capacitance vs. Reverse voltage
V
R
Reverse voltage [V]
C Diode capacitance [pF]
2
1
5
20
10
50
1
2
5
10
20
50
100
Ta = 25C
V
R
= 28V
Reverse current vs. Ambient temperature
Ta Ambient temperature [C]
I
R
Reverse current [pA]
20
1
0
20
40
60
80
10
100
Forward voltage vs. Ambient temperature
Ta Ambient temperature [C]
V
F
Forward voltage [V]
20
0.50
I
F
= 1mA
0
20
40
60
80
0.60
0.70
0.80
Reverse voltage vs. Ambient temperature
Ta Ambient temperature [C]
V
R
Reverse voltage [V]
20
35
I
R
= 10A
0
20
40
60
80
40
45
50
Example of Representative Characteristics
3
1T408
Diode capacitance vs. Ambient temperature
Ta Ambient temperature [C]
C [Ta] / C [25C] Diode capacitance
20
0.98
V
R
= 1V
0
20
40
60
80
0.99
1.01
1.03
1.00
1.02
V
R
= 2V
V
R
= 7V
V
R
= 15V
V
R
= 25V
Reverse current vs. Reverse voltage
V
R
Reverse voltage [V]
I
R
Reverse current [pA]
1
1
3
10
50
10
100
1000
Ta = 80C
Ta = 60C
Ta = 25C
Temperature coefficient of diode capacitance
V
R
Reverse voltage [V]
Temperature coefficient [ppm/C]
1
50
2
10
5
20
50
100
200
500
1000
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