1T378A
Variable Capacitance Diode
Description
The 1T378A is a variable capacitance diode
designed for electronic tuning of wide-band CATV
tuners, and the super miniature package allows the
tuner miniaturization.
High capacitance ratio (C
25
/C
28
) is improved to
support guard band.
Features
•
Super miniature package
•
Low series resistance 0.85
Ω
Max. (f=470 MHz)
•
Large capacitance ratio 12.5 Typ. (C
2
/C
25
)
1.03
•
Small leakage current
•
Capacitance deviation
Min. (C
25
/C
28
)
10 nA Max. (V
R
=28 V)
within 2 %
Absolute Maximum Ratings
(Ta=25 °C)
•
Reverse voltage
•
Operating temperature
•
Storage temperature
V
R
Topr
Tstg
34
–20 to +75
–65 to +150
V
°C
°C
M-235
Applications
Electronic tuning of VHF band and wide-band
CATV tuners
Structure
Silicon epitaxial planar type diode
Electrical Characteristics
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 µA
V
R
=2 V, f=1 MHz
V
R
=25 V, f=1 MHz
Min.
34
33.0
2.57
12.0
1.03
C
D
=14 pF, f=470 MHz
V
R
=2 to 25 V, f=1 MHz
0.85
2
Typ.
Max.
10
39.0
3.00
12.5
(Ta=25 °C)
Unit
nA
V
pF
pF
Ω
%
The continuous 20 pieces of
∆C
are guaranteed.
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—
E97108A82-TE
SONY [ SONY CORPORATION ]
