--1--
E97109-TE
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Variable Capacitance Diode
M-290
1T405A
Absolute Maximum Ratings (Ta=25 C)
Reverse voltage
V
R
34
V
Operating temperature
Topr
20 to +75
C
Storage temperature
Tstg
65 to +150
C
Description
The 1T405A is a variable capacitance diode
designed for electronic tuning of wide-band CATV
tuners using a super-small-miniature flat package
(SSVC).
High capacitance ratio (C25/C28) is improved to
support guard band.
Features
Super-small-miniature flat package
Low series resistance
0.85
Max. (f=470 MHz)
Large capacitance ratio 12.5 Typ.
(C
2
/C
25
)
1.03 Min.
(C
25
/C
28
)
Small leakage current
10 nA Max. (V
R
=28 V)
Capacitance deviation
within 2 %
Applications
Electronic tuning of VHF band and wide-band
CATV tuners
Structure
Silicon epitaxial planar type diode
Electrical Characteristics
(Ta=25 C)
Unit
nA
V
pF
pF
%
Max.
10
38.96
2.96
0.85
2
Typ.
12.5
Min.
34
32.96
2.53
12.0
1.03
Item
Reverse current
Reverse voltage
Diode capacitance
Capacitance ratio
Series resistance
Capacitance
deviation in a
matching group
Symbol
I
R
V
R
C
2
C
25
C
2
/C
25
C
25
/C
28
rs
C
Conditions
V
R
=28 V
I
R
=1 A
V
R
=2 V, f=1 MHz
V
R
=25 V, f=1 MHz
C
D
=14 pF, f=470 MHz
V
R
=2 to 25 V, f=1 MHz
The continuous 20 pieces of
C are guaranteed.
--2--
1T405A
1
2
5
10
20
50
1
2
5
10
20
50
100
Diode capacitance vs. Reverse voltage
V
R
-Reverse voltage (V)
C-Diode capacitance (pF)
Reverse current vs. Ambient temperature
20
0
20
40
60
80
Ta-Ambient temperature (C)
I
R
-Reverse current (pA)
1
100
1000
100
10
Reverse current vs. Reverse voltage
I
R
-Reverse current (pA)
10.00
10000.00
1000.00
100.00
1
10
100
V
R
-Reverse voltage (V)
1.00
Ta=25C, f=1MHz
V
R
=28V
Ta=60C
Ta=25C
Ta=80C
--3--
1T405A
1000
Thermal coefficient of diode capacitance
1
10
V
R
-Reverse voltage (V)
Thermal coefficient (ppm/C)
10
100
100
0.99
1.00
1.01
1.02
1.03
1.04
Diode capacitance vs. Ambient temperature
C (Ta) / C (25C)-Diode capacitance
V
R
=1V
V
R
=2V
V
R
=25V
V
R
=15V
V
R
=7V
Forward voltage vs. Ambient temperature
V
F
-Forward voltage (V)
20
0
20
40
60
80
Ta-Ambient temperature (C)
0.80
0.70
0.60
0.50
Reverse voltage vs. Ambient temperature
V
R
-Reverse voltage (V)
20
0
20
40
60
80
Ta-Ambient temperature (C)
45
35
30
I
F
=1mA
I
R
=10A
20
0
20
40
60
80
Ta-Ambient temperature (C)
0.97
0.98
f=1MHz
f=1MHz
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