Sony 1T378A Datasheet

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E97108A82-TE

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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.

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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