Datasheet

UNISONIC TECHNOLOGIES CO., LTD
BB179
DIODE
UHF VARIABLE CAPACITANCE
DIODE

DESCRIPTION
The UTC BB179 is a planar technology variable capacitance
diode providing the designers excellent matching performance, low
series resistance and great linearity.
The UTC BB179 is suitable for VCO (Voltage Controlled
Oscillators) and Electronic tuning in UHF (Very High Frequency)
tuners.

1
2
SOD-523
FEATURES
* Excellent matching to 2% DMA
* Low series resistance.
* Great linearity
* C28: 2.1 pF; ratio: 9

SYMBOL

ORDERING INFORMATION
Ordering Number
BB179G-CC2-R
Note: Pin Assignment: A: Anode
K: Cathode

Package
SOD-523
Pin Assignment
1
2
A
K
Packing
Tape Reel
MARKING
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Copyright © 2015 Unisonic Technologies Co., Ltd
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QW-R601-033.C
BB179

DIODE
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Continuous Reverse Voltage
VR
30
V
Peak Reverse Voltage (In series with a 10 kΩ resistor)
VRM
35
V
Continuous Forward Current
IF
20
mA
Storage Temperature
TSTG
-40~+150
°C
Operating Junction Temperature
TJ
-40~+125
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS (TJ =25°C unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
VR = 30 V
10
nA
200 nA
VR = 30 V, TJ=85 °C
f = 470 MHz, VR is the value at
0.6 0.75
Ω
which Cd=9pF
VR = 1 V, f = 1 MHz
18.22
23
pF
VR = 28 V, f = 1 MHz
5
pF
Reverse Current
IR
Diode Series Resistance
rS
Diode Capacitance
Cd
Capacitance Ratio
Cd(1V)
Cd(2V)
f = 1 MHz
Capacitance Ratio
Cd(1V)
Cd(28V)
f = 1 MHz
Capacitance Ratio
Cd(25V)
Cd(28V)
f = 1 MHz
Capacitance Matching
∆Cd
Cd
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
VR = 1~28 V, in a sequence of
15 diodes (gliding)
1.27
6
1.05
2
%
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QW-R601-033.C
BB179
DIODE
TYPICAL CHARACTERISTICS
85°C
25°C
10
1
Typical Reverse Characteristics
Typical Forward Characteristics
100
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Instantaneous Reverse Current, IR (nA)
Instantaneous Forward Voltage, VF (V)
350
Instantaneous Reverse Current , IR (mA)
Instantantaneous Forward Current, IF (mA)

10
85°C
1
25°C
0.1
0
10
20
30
40
50
Instantaneous Reverse Voltage, VR (V)
Instantaneous Reverse Current vs.
Breakdown Voltage
300
250
200
150
100
50
0
10
20
30
40
50
60
70
80
Instantaneous Reverse Voltage, VR (V)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R601-033.C
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