LESHAN RADIO COMPANY, LTD.
BB149–1/2
UHF variable capacitance diode
SOD– 323
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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
Tj = 25 °C unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
IR reverse current VR = 30 V; see Fig.2 – 10 nA
VR = 30 V; Tj = 85 °C; see Fig.2 – 200 nA
rs diode series resistance f = 470 MHz; note 1 – 0.75 Ω
Cd diode capacitance VR = 0.5 V; f = 1 MHz; see Figs 1 and 3 18 19.5 pF
VR = 28 V;f = 1 MHz; see Figs 1 and 3 1.9 2.25 pF
Cd( 1V ) capacitance ratio f = 1 MHz 8.2 10
Cd (28V )
Cd( 19V ) capacitance ratio f = 1 MHz 1.2 –
Cd (28V )
∆Cd capacitance matching VR = 0.5 to 28 V; in a sequence of 4 diodes – 1 %
Cd (gliding)
VR= 0.5 to 28 V; in a sequence of 15 diodes – 2 %
(gliding)
Note
1. VR is the value at which Cd = 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
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2