Sony 1T408 Datasheet

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).

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

1T408

M-290

Structure

Silicon epitaxial planar-type diode

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

Electrical Characteristics (Ta = 25°C)

Item

Reverse current

Diode capacitance

Capacitance ratio

Series resistance
Capacitance deviation

in a matching group

Symbol Conditions Typ.Min. Max. Unit
IR
C2
C25
C2/C25
C25/C28
rs

∆C

VR = 28V
VR = 2V, f = 1MHz
VR = 25V, f = 1MHz

CD = 14pF, f = 470MHz
VR = 2 to 25V, f = 1MHz

29.46

2.49

11.0

1.03

10

35.46

2.89

11.7

0.75
2

nA
pF
pF

Ω

%

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

Example of Representative Characteristics

1T408

Diode capacitance vs. Reverse voltage

100

50

20

10

5

C – Diode capacitance [pF]

2

1

2152010 50

VR – Reverse voltage [V]

Ta = 25°C

Reverse current vs. Ambient temperature

VR = 28V

100

10

– Reverse current [pA]

R

I

1

–20

0 20406080

Ta – Ambient temperature [°C]

Forward voltage vs. Ambient temperature

0.80

0.70

0.60

– Forward voltage [V]

F

V

0.50
–20

020406080

Ta – Ambient temperature [°C]

F = 1mA

I

Reverse voltage vs. Ambient temperature

50

45

40

– Reverse voltage [V]

R

V

35

–20

020406080

IR = 10µA

Ta – Ambient temperature [°C]

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