SONY 1T408

1T408
Variable Capacitance Diode
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).
M-290
Features
• Super-small-miniature flat package
• Small series resistance 0.75Ω Max. (f = 470MHz)
• Large capacitance ratio 11.7 Typ. (C2/C25)
18.0 Typ. (C1/C28)
• Small leakage current
10nA Max. (VR = 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 = 25°C)
• Reverse voltage
VR
34
• Operating temperature Topr
–20 to +75
• Storage temperature
Tstg
–65 to +150
V
°C
°C
Electrical Characteristics
Item
Reverse current
Diode capacitance
Capacitance ratio
(Ta = 25°C)
Symbol
Conditions
Min.
Typ.
Max.
Unit
10
nA
IR
VR = 28V
C2
VR = 2V, f = 1MHz
29.46
35.46
pF
C25
VR = 25V, f = 1MHz
2.49
2.89
pF
C2/C25
11.0
C25/C28
1.03
11.7
Series resistance
rs
CD = 14pF, f = 470MHz
0.75
Ω
Capacitance deviation
in a matching group
∆C
VR = 2 to 25V, f = 1MHz
2
%
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.
–1–
E97522-PS
1T408
Example of Representative Characteristics
Diode capacitance vs. Reverse voltage
Reverse current vs. Ambient temperature
100
VR = 28V
Ta = 25°C
100
20
IR – Reverse current [pA]
C – Diode capacitance [pF]
50
10
5
2
10
1
1
2
5
10
20
VR – Reverse voltage [V]
50
1
–20
Forward voltage vs. Ambient temperature
50
IF = 1mA
VR – Reverse voltage [V]
VF – Forward voltage [V]
80
Reverse voltage vs. Ambient temperature
0.80
0.70
0.60
0.50
–20
0
20
40
60
Ta – Ambient temperature [°C]
0
20
40
60
Ta – Ambient temperature [°C]
IR = 10µA
45
40
35
–20
80
–2–
0
20
40
60
Ta – Ambient temperature [°C]
80
1T408
Diode capacitance vs. Ambient temperature
1.03
C [Ta] / C [25°C] – Diode capacitance
VR = 1V
VR = 2V
1.02
VR = 7V
1.01
VR = 15V
VR = 25V
1.00
0.99
0.98
–20
0
20
40
60
Ta – Ambient temperature [°C]
80
Reverse current vs. Reverse voltage
Temperature coefficient of diode capacitance
1000
1000
Temperature coefficient [ppm/°C]
Ta = 80°C
IR – Reverse current [pA]
Ta = 60°C
100
Ta = 25°C
500
200
100
50
1
10
1
1
3
10
VR – Reverse voltage [V]
50
–3–
2
5
10
VR – Reverse voltage [V]
20
50
1T408
Package Outline
Unit: mm
0.2 M
A
M-290
0.2 ± 0.05
10° MAX
1.7 ± 0.1
1.3 ± 0.1
A
0.8 ± 0.1
c
b
10° MAX
0.7 ± 0.1
BASE METAL WITH PLATING
c
0.11 ± 0.005
+ 0.05
0.11 –
0.01
b
0.3 ± 0.025
0.05
0.3 –+ 0.02
PACKAGE MATERIAL
EPOXY RESIN
LEAD TREATMENT
SOLDER PLATING
EIAJ CODE
LEAD MATERIAL
COPPER
JEDEC CODE
PACKAGE WEIGHT
0.002g
SONY CODE
M-290
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