LESHAN RADIO COMPANY, LTD.
BB1491/2
UHF variable capacitance diode
SOD 323
1
2
BB 149
2
ANODE
1
CATHODE
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
R
continuous reverse voltage
30
V
I
F
continuous forward current
20
mA
T
stg
storage temperature
55
+150
C
T
j
operating junction temperature
55
+125
C
ELECTRICAL CHARACTERISTICS
T
j
= 25 C unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX. UNIT
I
R
reverse current
V
R
= 30 V; see Fig.2
10
nA
V
R
= 30 V; T
j
= 85 C; see Fig.2
200
nA
r
s
diode series resistance
f = 470 MHz; note 1
0.75
C
d
diode capacitance
V
R
= 0.5 V; f = 1 MHz; see Figs 1 and 3
18
19.5
pF
V
R
= 28 V;f = 1 MHz; see Figs 1 and 3
1.9
2.25
pF
C
d( 1V )
capacitance ratio
f = 1 MHz
8.2
10
C
d (28V )
C
d( 19V )
capacitance ratio
f = 1 MHz
1.2
C
d (28V )
C
d
capacitance matching
V
R
= 0.5 to 28 V; in a sequence of 4 diodes
1
%
C
d
(gliding)
V
R
= 0.5 to 28 V; in a sequence of 15 diodes
2
%
(gliding)
Note
1. V
R
is the value at which C
d
= 9 pF.
FEATURES
Excellent linearity
Excellent matching to 1% DMA
Very small plastic SMD package
C28: 2.1 pF; ratio 9
Low series resistance.
APPLICATIONS
Electronic tuning in UHF television
tuners
VCO.
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.
MARKING CODE:P9
P9
1
2
LESHAN RADIO COMPANY, LTD.
BB1492/2
BB 149
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
Fig.2 Reverse current as a function of junction
temperature; maximum values.
Fig.3 Temperature coefficient of diode
capacitance as a function of
reverse voltage; typical values.
f = 1 MHz; T
j
= 25 C
.
T
j
= 0 to 85 C
.
PDF 
ZIP