LESHAN RADIO COMPANY, LTD.
BB179B–1/2
UHF variable capacitance diode
SOD523 SC-79
1
2
BB 179B
2
ANODE
1
CATHODE
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
R
continuous reverse voltage – 32 V
V RM peak reverse voltage in series with a 10 kΩ resistor – 35 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. TYP. 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; – 0.6 0.75 Ω
V
R
is the value at which Cd =9 pF
C d diode capacitance V R = 1 V; f = 1 MHz; see Figs 1and 3 18.22 – 20 pF
V
R
= 28 V; f = 1 MHz; see Figs 1and 3 1.9 – 2.25 pF
C d(1V)
capacitance ratio f = 1 MHz – 1.27 –
C
d(2V)
C d(1V)
capacitance ratio f = 1 MHz 8.45 – 10
C
d(28V)
C d(25V)
capacitance ratio f = 1 MHz – 1.05 –
C
d(28V)
∆C
d
capacitance matching V R = 1 to 28 V; in a sequence of 15 ––2%
C
d
diodes(gliding)
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.