LRC BB149 Datasheet
UHF variable capacitance diode
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 encapsulated 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.
LESHAN RADIO COMPANY, LTD.
BB 149
1
2
SOD– 323
MARKING CODE:P9
1
CATHODE
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER MIN. MAX. UNIT
V
R
I
F
T
stg
T
j
continuous reverse voltage – 30 V
continuous forward current – 20 mA
storage temperature –55 +150 °C
operating junction temperature –55 +125 °C
2
ANODE
1
P9
ELECTRICAL CHARACTERISTICS
T
j = 25 °C unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
R reverse current VR = 30 V; see Fig.2 – 10 nA
I
V
R = 30 V; Tj = 85 °C; see Fig.2 – 200 nA
s diode series resistance f = 470 MHz; note 1 – 0.75 Ω
r
C
d diode capacitance VR = 0.5 V; f = 1 MHz; see Figs 1 and 3 18 19.5 pF
R = 28 V;f = 1 MHz; see Figs 1 and 3 1.9 2.25 pF
V
d( 1V ) capacitance ratio f = 1 MHz 8.2 10
C
C
d (28V )
Cd( 19V ) capacitance ratio f = 1 MHz 1.2 –
C
d (28V )
∆Cd capacitance matching VR = 0.5 to 28 V; in a sequence of 4 diodes – 1 %
C
d (gliding)
R= 0.5 to 28 V; in a sequence of 15 diodes – 2 %
V
(gliding)
Note
1. V
R is the value at which Cd = 9 pF.
2
BB149–1/2
LESHAN RADIO COMPANY, LTD.
BB 149
f = 1 MHz; Tj = 25 °C.
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
Fig.2 Reverse current as a function of junction
temperature; maximum values.
Tj = 0 to 85 °C.
Fig.3 Temperature coefficient of diode
capacitance as a function of
reverse voltage; typical values.
BB149–2/2
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