LESHAN RADIO COMPANY, LTD.
UHF variable capacitance diode
BB 149
FEATURES
路
Excellent linearity
路
Excellent matching to 1% DMA
路
Very small plastic SMD package
路
C28: 2.1 pF; ratio 9
路
Low series resistance.
APPLICATIONS
路
Electronic tuning in UHF television
tuners
路
VCO.
1
CATHODE
DESCRIPTION
The BB149 is a variable capacitance diode,
fabricated in planar technology, and encap-
sulated in the SOD323 very small plastic SMD
package.
The excellent matching performance is
achieved by gliding matching and a direct
matching assembly procedure. The unmatched
type, BB159 has the same specification.
SOD鈥?323
MARKING CODE:P9
2
ANODE
1
2
P9
MIN.
鈥?/div>
鈥?/div>
鈥?/div>
18
1.9
8.2
1.2
鈥?/div>
鈥?/div>
10
200
0.75
19.5
2.25
10
鈥?/div>
1
2
%
%
1
2
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
MIN.
MAX.
V
R
continuous reverse voltage
鈥?/div>
30
I
F
T
stg
T
j
continuous forward current
storage temperature
operating junction temperature
鈥?/div>
鈥?5
鈥?5
20
+150
+125
UNIT
V
mA
擄C
擄C
ELECTRICAL CHARACTERISTICS
T
j
= 25 擄C unless otherwise specified.
SYMBOL
I
R
r
s
C
d
C
d( 1V )
C
d (28V )
C
d( 19V )
C
d (28V )
鈭咰
d
C
d
PARAMETER
reverse current
diode series resistance
diode capacitance
capacitance ratio
capacitance ratio
capacitance matching
CONDITIONS
V
R
= 30 V; see Fig.2
V
R
= 30 V; T
j
= 85 擄C; see Fig.2
f = 470 MHz; note 1
V
R
= 0.5 V; f = 1 MHz; see Figs 1 and 3
V
R
= 28 V;f = 1 MHz; see Figs 1 and 3
f = 1 MHz
f = 1 MHz
V
R
= 0.5 to 28 V; in a sequence of 4 diodes
(gliding)
V
R
= 0.5 to 28 V; in a sequence of 15 diodes
(gliding)
Note
1. V
R
is the value at which C
d
= 9 pF.
MAX. UNIT
nA
nA
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