Page 1
—1—
E97108A82-TE
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.
Absolute Maximum Ratings (Ta=25 °C)
• Reverse voltage VR 34 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
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 (C25/C28) 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. (C2/C25)
1.03 Min. (C25/C28)
• 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
Variable Capacitance Diode
M-235
1T378A
Electrical Characteristics (Ta=25 °C)
Item
Reverse current
Reverse voltage
Diode capacitance
Capacitance ratio
Series resistance
Capacitance deviation in a
matching group
Symbol
IR
VR
C2
C25
C2/C25
C25/C28
rs
∆C
Conditions
VR=28 V
IR=1 µA
VR=2 V, f=1 MHz
VR=25 V, f=1 MHz
CD=14 pF, f=470 MHz
VR=2 to 25 V, f=1 MHz
Min. Typ. Max. Unit
10 nA
34 V
33.0 39.0 pF
2.57 3.00 pF
12.0 12.5
1.03
0.85 Ω
2%
The continuous 20 pieces of ∆C are guaranteed.
Page 2
—2—
1T378A
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)
1.00
1000.00
100.00
10.00
1 10 100
V
R-Reverse voltage (V)
0.10
Ta=25°C, f=1MHz VR=28V
Ta=25°C
Ta=60°C
Ta=80°C
Page 3
—3—
1T378A
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 (25°C)-Diode capacitance
VR=1V
V
R=2V
V
R=25V
VR=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
40
35
30
IF=1mA IR=10µA
–20 0 20 40 60 80
Ta-Ambient temperature (°C)
0.97
0.98
f=1MHz
f=1MHz
Page 4
Package Outline Unit : mm
AAA
M-235
AAA
1T378A
∗1.25
2
1
+ 0.2
– 0.1
0.3
0.3
+ 0.1
– 0.05
∗0.9 ± 0.1
+ 0.1
– 0.05
2.5 ± 0.2
∗1.7 ± 0.1
NOTE: Dimension “∗” does not include mold protrusion.
0.2
0.11
+ 0.1
– 0.06
0 ± 0.05
0° to 10°
Marking
SONY CODE
EIAJ CODE
JEDEC CODE
M-235
CATHODE MARK
2
78
B
1
—4—
PACKAGE WEIGHT
Notes
1) B:Lot No.(Year and Month of manufacture)
Year;Last one digit
Month;A,B,C(for Oct. to Dec.)
0.1g
1 to 9(for Jan.to Sept.)
Loading...