1T378A
Variable Capacitance Diode
Description
M-235
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 (C25/C28) is improved to
support guard band.
Features
• Super miniature package
Absolute Maximum Ratings (Ta=25 °C)
• Low series resistance 0.85 Ω Max. (f=470 MHz)
• Reverse voltage
• Operating temperature Topr
• Storage temperature
VR
34
V
• Large capacitance ratio 12.5
Typ. (C2/C25)
Min. (C25/C28)
–20 to +75
°C
1.03
Tstg –65 to +150 °C
• Small leakage current 10 nA Max. (VR=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)
Item
Reverse current
Reverse voltage
Symbol
IR
Conditions
Min.
Typ.
12.5
Max.
10
Unit
nA
V
VR=28 V
VR
IR=1 µA
34
C2
VR=2 V, f=1 MHz
VR=25 V, f=1 MHz
33.0
2.57
12.0
1.03
39.0
3.00
pF
pF
Diode capacitance
Capacitance ratio
C25
C2/C25
C25/C28
rs
Series resistance
CD=14 pF, f=470 MHz
VR=2 to 25 V, f=1 MHz
0.85
2
Ω
Capacitance deviation in a
matching group
∆C
%
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.
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E97108A82-TE
