LRC BB179B Datasheet
LESHAN RADIO COMPANY, LTD.
UHF variable capacitance diode
FEATURES
· Excellent linearity
· Excellent matching to 2% DMA
· Ultra small plastic SMD package
· C28: 2.1 pF; ratio: 9
· Low series resistance.
APPLICATIONS
· Electronic tuning in UHF television tuners
· Voltage controlled oscillators
DESCRIPTION
The BB179B 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.
BB 179B
1
2
SOD523 SC-79
1
CA THODE
2
ANODE
LIMITING V ALUES In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
R
V
RM
I
F
T
stg
T
j
ELECTRICAL CHARACTERISTICS T
continuous reverse voltage – 32 V
peak reverse voltage in series with a 10 kΩ resistor – 35 V
continuous forward current – 20 mA
storage temperature –55 +150 °C
operating junction temperature –55 +125 °C
=25°C unless otherwise specified.
j
SYMBOL PARAMETER CONDITIONS MIN. MAX. TYP. UNIT
I
R
r
s
reverse current V R = 30 V; see Fig.2 – – 10 n A
V
= 30 V; T j =85°C; see Fig.2 – – 200 nA
R
diode series resistance f = 470 MHz; – 0.6 0.75 Ω
V R is the value at which Cd =9 pF
C
C
C
C
C
C
∆C
C
C
d(1V)
d(2V)
d(1V)
d(28V)
d(25V)
d(28V)
d
d
d
diode capacitance
V R = 1 V; f = 1 MHz; see Figs 1and 3
V R = 28 V; f = 1 MHz; see Figs 1and 3
18.22 – 20 pF
1.9 – 2.25 pF
capacitance ratio f = 1 MH z – 1.27 –
capacitance ratio f = 1 MH z 8.45 – 10
capacitance ratio f = 1 MH z – 1.05 –
capacitance matching
V R = 1 to 28 V; in a sequence of 15
––2%
diodes(gliding)
BB179B–1/2
24
20
16
( pF )
d
12
C
LESHAN RADIO COMPANY, LTD.
BB 179B
8
4
0
–1
10
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
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.
f = 1 MHz; T j =25°C
1 10 10
V R ( V )
–3
10
–4
10
)
-1
( K
d
TC
–5
10
–1
10
1 10 10
V R ( V )
Fig.3 Temperature coefficient of diode capacitance as a function of
reverse voltage; typical values.
2
T j = 0 to 85 °C.
2
BB179B–2/2
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