Variable Capacitance Diode
Description
The 1T404A 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
Low series resistance
0.75
Max. (f = 470MHz)
Large capacitance ratio
11.5 Typ.
(C
2
/C
25
)
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
E99805-PS
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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.
1T404A
M-290
Electrical Characteristics
(Ta = 25C)
Reverse voltage
Reverse current
Diode capacitance
Capacitance ratio
Series resistance
Capacitance deviation in a matching group
V
R
I
R
C
2
C
25
C
2
/C
25
C
25
/C
28
rs
C
I
R
= 1A
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
34.0
29.5
2.60
11.0
1.03
11.5
10.0
33.5
2.90
0.75
2.0
V
nA
pF
pF
%
Unit
Max.
Typ.
Min.
Conditions
Symbol
Item
2
1T404A
1
2
5
10
20
50
1
2
5
10
20
50
100
Diode capacitance vs. Reverse voltage
V
R
Reverse voltage [V]
C
D
i
o
d
e
c
a
p
a
c
i
t
a
n
c
e
[
p
F
]
Ta = 25C
100
1
10
100
Reverse current vs. Ambient temperature
20
0
20
40
60
80
Ta Ambient temperature [C]
I
R
R
e
v
e
r
s
e
c
u
r
r
e
n
t
[
p
A
]
V
R
= 28V
0.60
0.80
Forward voltage vs. Ambient temperature
20
0
20
40
60
80
Ta Ambient temperature [C]
V
F
F
o
r
w
a
r
d
v
o
l
t
a
g
e
[
V
]
I
F
= 1mA
0.70
0.50
Ta Ambient temperature [C]
40
50
Reverse voltage vs. Ambient temperature
20
0
20
40
60
80
V
R
R
e
v
e
r
s
e
v
o
l
t
a
g
e
[
V
]
45
35
I
R
= 10A
3
1T404A
1.01
1.03
Diode capacitance vs. Ambient temperature
20
0
20
40
60
80
Ta Ambient current [C]
C
(
T
a
)
/
C
(
2
5
C
)
D
i
o
d
e
c
a
p
a
c
i
t
a
n
c
e
V
R
= 1V
1.02
1.00
0.99
0.98
V
R
= 2V
V
R
= 7V
V
R
= 25V
V
R
= 15V
1
100
Reverse current vs. Reverse voltage
1
3
10
30
V
R
Reverse voltage [V]
I
R
R
e
v
e
r
s
e
c
u
r
r
e
n
t
[
p
A
]
10
0.1
Ta = 80C
Ta = 60C
Ta = 25C
1000
Temperature coefficient of diode capacitance
1
2
5
10
V
R
Reverse voltage [V]
T
e
m
p
e
r
a
t
u
r
e
c
o
e
f
f
i
c
i
e
n
t
[
p
p
m
/
C
]
50
20
50
500
200
100
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