LESHAN RADIO COMPANY, LTD.
BB178–1/2
VHF variable capacitance diode
BB 178
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 = 100 MHz;
– 0.65 0.8 Ω
V
R
is the value at which Cd =30 pF
C d diode capacitance V R = 1 V; f = 1 MHz; see Figs 1and 3 34.65 – 42.35 pF
V
R
= 28 V; f = 1 MHz; see Figs 1and 3 2.361 – 2.754 pF
C d(1V)
capacitance ratio f = 1 MHz – 1.3 –
C
d(2V)
C d(1V)
capacitance ratio f = 1 MHz 13.5 – –
C
d(28V)
C d(25V)
capacitance ratio f = 1 MHz – 1.08 –
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
· C 28: 2.6 pF; ratio: 15
· Very low series resistance.
APPLICATIONS
· Electronic tuning in VHF television
tuners, band B up to 460 MHz
· Voltage controlled oscillators(VCO).
DESCRIPTION
The BB178 is a planar technology variable
capacitance diode, in a SOD523 (SC-79)
package. The excellent matching perfor-
mance is achieved by gliding matching and
a direct matching assembly procedure.
MARKING CODE:8
8
1
2
SOD523 SC-79
1
2