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
CATHODE
2
ANODE
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
R
V
RM
I
F
T
stg
T
j
PARAMETER
continuous reverse voltage
peak reverse voltage
continuous forward current
storage temperature
operating junction temperature
in series with a 10 kΩ resistor
CONDITIONS
MIN.
–
–
–
–55
–55
MAX.
32
35
20
+150
+125
UNIT
V
V
mA
°C
°C
ELECTRICAL CHARACTERISTICS
T
j
=25°C unless otherwise specified.
SYMBOL
I
R
r
s
C
d
C
d(1V)
C
d(2V)
C
d(1V)
C
d(28V)
C
d(25V)
C
d(28V)
∆C
d
C
d
PARAMETER
reverse current
diode series resistance
diode capacitance
CONDITIONS
V
R
= 30 V; see Fig.2
V
R
= 30 V; T
j
=85°C; see Fig.2
f = 470 MHz;
V
R
is the value at which Cd =9 pF
V
R
= 1 V; f = 1 MHz; see Figs 1and 3
V
R
= 28 V; f = 1 MHz; see Figs 1and 3
f = 1 MHz
f = 1 MHz
f = 1 MHz
V
R
= 1 to 28 V; in a sequence of 15
diodes(gliding)
MIN.
–
–
–
18.22
1.9
–
8.45
–
–
MAX.
–
–
0.6
–
–
1.27
–
1.05
–
TYP.
10
200
0.75
20
2.25
–
10
–
2
%
UNIT
nA
nA
Ω
pF
pF
capacitance ratio
capacitance ratio
capacitance ratio
capacitance matching
BB179B–1/2
LRC [ LESHAN RADIO COMPANY ]
