TWPEC

Variable Capacitance Diode

Description
The 1W404 is a variable capacitance diode contained
for electronic tuning of wide-band CATV tuners using a
super-small-miniature flat package (SSVC).

Features
．Super-small-miniature flat package
．Low series resistance 0.65Ω Max (ｆ= 470MHz)
．Large capacitance ratio 11.5 Typ (C2/C25)
．Small leakage current 10nA Max (VR=28V)
．Capacitance deviation within ２％ Absolute Maximum Ratings (Ta=25℃)
．Reverse voltage Ｖ Ｒ 34 Ｖ
．Operating temperature Topr -20～+ 75 ℃
Applications ．Storage temperature Tstg -65～+ 150 ℃
Electronic tuning of wide-band CATV tuners

Structure
Silicon epitaxial planar type diode


Electrical Characteristics (Ta=25℃)
Item Symbol Conditions Min. Typ. Max. Unit
Reverse voltage Ｖ R IR=1μA 34 V
Reverse current IR VR=28V 10 nA
Ｃ 2 VR=2V, f=1MHz 29.50 33.50 pF
Diode capacitance
Ｃ 25 VR=25V, f=1MHz 2.60 2.90 pF
Ｃ 2/Ｃ 25 11.0 11.5
Capacitance ratio
Ｃ 25/Ｃ 28 1.03

Series resistance

rs
CD=14pF, f=470MHz
Tester： 4191A
Tester： 4291B

0.58
0.61

0.65


Ω
Capacitance deviation in a
matching group
ΔＣ VR=2～2 5V, f=1MHz 2.0 %
△C：The capacitance deviation of continuous 20 pcs of 1W404 is ranged within 2% in any
place of the taping package.


TWPEC 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 patens or other right. Application circuits shown,
if any, are typical examples illustrating the operation of the devices. TWPEC cannot assume responsibility for
any problems arising out of the use of these circuits.
1W404


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