LRC BB178 Datasheet
VHF variable capacitance diode
LESHAN RADIO COMPANY, LTD.
BB 178
FEATURES
· Excellent linearity
· Excellent matching to 2% DMA
· Ultra small plastic SMD package
· C 28: 2.6 pF; ratio: 15
· Very low series resistance.
APPLICATIONS
· Electronic tuning in VHF television
tuners, band B up to 460 MHz
· Voltage controlled oscillators(VCO).
1
CATHODE
DESCRIPTION
The BB178 is a planar technology variable
capacitance diode, in a SOD523 (SC-79)
package. The excellent matching performance is achieved by gliding matching and
a direct matching assembly procedure.
2
ANODE
2
SOD523 SC-79
MARKING CODE:8
1
LIMITING V ALUES In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
V
I
T
T
R
RM
F
stg
j
continuous reverse voltage – 32 V
peak reverse voltage in series with a 10 kΩ resistor – 35 V
continuous forward current – 2 0 mA
storage temperature –55 +150 °C
operating junction temperature –55 +125 °C
8
1
2
ELECTRICAL CHARACTERISTICS T
=25°C unless otherwise specified.
j
SYMBOL PARAMETER CONDITIONS MIN. MAX. TYP. UNIT
C
C
C
C
C
C
∆C
C
I
R
r
C
d(1V)
d(2V)
d(1V)
d(28V)
d(25V)
d(28V)
d
d
s
d
reverse current V R = 30 V; see Fig.2 – – 10 nA
V
= 30 V; T j =85°C; see Fig.2 – – 200 nA
R
diode series resistance f = 100 MHz;
V R is the value at which Cd =30 pF
diode capacitance
V R = 1 V; f = 1 MHz; see Figs 1and 3
V R = 28 V; f = 1 MHz; see Figs 1and 3
– 0.65 0.8 Ω
34.65 – 42.35 pF
2.361 – 2.754 pF
capacitance ratio f = 1 MH z – 1.3 –
capacitance ratio f = 1 MH z 13.5 – –
capacitance ratio f = 1 MH z – 1.08 –
capacitance matching
V R = 1 to 28 V; in a sequence of 15
––2%
diodes(gliding)
BB178–1/2
LESHAN RADIO COMPANY, LTD.
50
40
30
( pF )
d
C
20
f = 1 MHz; T j =25°C
10
0
–1
10
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
1 10 10
V R ( V )
BB 178
2
3
10
(nA)
R
2
I
10
10
0 50 100
T j ( °C )
Fig.2 Reverse current as a function of junction
temperature; maximum values.
–3
10
–4
10
)
-1
( K
d
TC
T j = 0 to 85 °C.
–5
10
–1
10
110
V R ( V )
Fig.3 Temperature coefficient of diode capacitance as a function of
reverse voltage; typical values.
BB178–2/2
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