BB178LX
UHF variable capacitance diode
Rev. 01 — 14 April 2006
Preliminary data sheet
1. Product profile
1.1 General description
The BB178LX is a planar technology variable capacitance diode in a SOD882T ultra small
leadless plastic SMD package. The excellent matching performance is achieved by gliding
matching and a Direct Matching Assembly (DMA) procedure.
1.2 Features
I
I
I
I
I
Excellent linearity
Excellent matching to 2 % DMA
Ultra small leadless SMD package
C
d(28V)
: 2.6 pF; C
d(1V)
to C
d(28V)
ratio typical 15
Low series resistance
1.3 Applications
I
Voltage Controlled Oscillators (VCO)
I
Electronic tuning in VHF television tuners, Band B up to 460 MHz
2. Pinning information
Table 1.
Pin
1
2
Discrete pinning
Description
cathode
anode
1
2
sym008
Simplified outline
[1]
Symbol
Transparent
top view
[1]
The marking bar indicates the cathode.
3. Ordering information
Table 2.
Ordering information
Name
BB178LX
-
Description
leadless ultra small plastic package; 2 terminals;
body 1.0
×
0.6
×
0.4 mm
Version
SOD882T
Type number Package
Philips Semiconductors
BB178LX
UHF variable capacitance diode
4. Marking
Table 3.
BB178LX
Marking
Marking code
L3
Type number
5. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
R
I
F
T
stg
T
j
Parameter
reverse voltage
forward current
storage temperature
junction temperature
Conditions
Min
-
-
−55
−55
Max
32
20
+150
+125
Unit
V
mA
°C
°C
6. Characteristics
Table 5.
Characteristics
T
j
= 25
°
C unless otherwise specified.
Symbol
I
R
Parameter
reverse current
Conditions
see
Figure 3
V
R
= 30 V
V
R
= 30 V; T
j
= 85
°C
r
s
C
d
diode series resistance
diode capacitance
f = 470 MHz; C
d
= 30 pF; see
Figure 2
see
Figure 1
and
Figure 4;
f = 1 MHz;
V
R
= 1 V
V
R
= 28 V
C
d
(
1V
)
----------------
C
d
(
2V
)
C
d
(
1V
)
------------------
-
C
d
(
28V
)
C
d
(
25V
)
------------------
-
C
d
(
28V
)
∆C
d
----------
C
d
diode capacitance ratio
f = 1 MHz
34.65
2.36
-
-
2.6
1.3
42.35
2.75
-
pF
pF
-
-
-
-
-
0.7
10
200
-
nA
nA
Ω
Min
Typ
Max
Unit
diode capacitance ratio
f = 1 MHz
13.5
15
-
diode capacitance ratio
f = 1 MHz
-
1.08
-
diode capacitance
matching
V
R
= 1 V to 28 V; in sequence of 5
diodes (gliding)
-
-
2
%
BB178LX_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 14 April 2006
2 of 7
Philips Semiconductors
BB178LX
UHF variable capacitance diode
60
C
d
(pF)
40
001aae539
0.8
r
s
(Ω)
0.6
001aae540
0.4
20
0.2
0
10
−1
1
10
V
R
(V)
10
2
0
10
−1
1
10
V
R
(V)
10
2
f = 1 MHz; T
j
= 25
°C.
f = 470 MHz; T
j
= 25
°C.
Fig 1. Diode capacitance as a function of reverse
voltage; typical values
Fig 2. Diode serial resistance as a function of reverse
voltage; typical values
10
3
I
R
(nA)
10
2
001aae541
10
−2
TC
Cd
(K
−1
)
10
−3
001aae542
10
10
−4
1
0
20
40
60
80
T
j
(°C)
100
10
−5
10
−1
1
10
V
R
(V)
10
2
T
j
= 0
°C
to 85
°C.
Fig 3. Reverse current as function of junction
temperature; maximum values
Fig 4. Temperature coefficient of diode capacitance
as a function of reverse voltage; typical values
BB178LX_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 14 April 2006
3 of 7
Philips Semiconductors
BB178LX
UHF variable capacitance diode
7. Package outline
Leadless ultra small plastic package; 2 terminals; body 1 x 0.6 x 0.4 mm
(2×)
w
M
SOD882T
L
1
(2×)
A
1
2
b (2×)
(2×)
w
e
1
M
B
A
A
1
y
E
A
D
(1)
B
0
DIMENSIONS (mm are the original dimensions)
UNIT
mm
A
0.40
0.36
A
1
max
0.04
b
0.55
0.45
D
0.65
0.55
E
1.05
0.95
e
1
0.65
L
1
0.30
0.22
w
0.1
y
0.03
0.5
scale
1 mm
Note
1.
The marking bar indicates the cathode
OUTLINE
VERSION
SOD882T
REFERENCES
IEC
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
04-12-14
06-04-12
Fig 5. Package outline SOD882T
BB178LX_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 14 April 2006
4 of 7
Philips Semiconductors
BB178LX
UHF variable capacitance diode
8. Revision history
Table 6.
Revision history
Release date
20060414
Data sheet status
Preliminary data sheet
Change notice
-
Supersedes
-
Document ID
BB178LX_1
BB178LX_1
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Preliminary data sheet
Rev. 01 — 14 April 2006
5 of 7
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