BB178
VHF variable capacitance diode
Rev. 3 — 5 September 2011
Product data sheet
1. Product profile
1.1 General description
The BB178 is a planar technology variable capacitance diode, in a SOD523 (SC-79) ultra
small plastic package. The excellent matching performance is achieved by gliding
matching and a Direct Matching Assembly (DMA) procedure.
1.2 Features and benefits
Excellent linearity
Excellent matching to 2 % DMA
Ultra small plastic SMD package
C
d(28V)
: 2.6 pF; C
d(1V)
to C
d(28V)
ratio: 15
Very low series resistance.
1.3 Applications
Electronic tuning in VHF television tuners, band B up to 460 MHz
Voltage Controlled Oscillators (VCO).
2. Pinning information
Table 1.
Pin
1
2
Pinning
Description
cathode
anode
1
2
sym008
Simplified outline
[1]
Symbol
[1]
The marking bar indicates the cathode.
3. Ordering information
Table 2.
Ordering information
Package
Name
BB178
SC-79
Description
plastic surface mounted package; 2 leads
Version
SOD523
Type number
NXP Semiconductors
BB178
VHF variable capacitance diode
4. Marking
Table 3.
BB178
Marking
Marking code
8
Type number
5. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
R
V
RM
I
F
T
stg
T
j
Parameter
reverse voltage
peak reverse voltage
forward current
storage temperature
junction temperature
in series with a
10 k resistor
Conditions
Min
-
-
-
55
55
Max
32
35
20
+150
+125
Unit
V
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 2
V
R
= 30 V
V
R
= 30 V; T
j
= 85
C
r
s
C
d
diode series
resistance
diode
capacitance
f = 100 MHz
f = 1 MHz; see
Figure 1
and
Figure 3
V
R
= 1 V
V
R
= 28 V
capacitance ratio f = 1 MHz
34.65
2.361
-
-
2.6
1.3
42.35
2.754
-
pF
pF
[1]
Min
-
-
-
Typ
-
-
0.65
Max
10
200
0.8
Unit
nA
nA
C
d
1V
---------------
-
C
d
2V
C
d
1V
------------------
C
d
28V
C
d
25V
------------------
C
d
28V
C
d
---------
-
C
d
[1]
capacitance ratio f = 1 MHz
13.5
15
-
capacitance ratio f = 1 MHz
-
1.08
-
capacitance
matching
V
R
= 1 V to 28 V; in a
sequence of 10 diodes
(gliding)
-
-
2
%
V
R
is the value at which C
d
= 30 pF.
BB178
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 5 September 2011
2 of 8
NXP Semiconductors
BB178
VHF variable capacitance diode
50
C
d
(pF)
40
mbk438
30
20
10
0
10
−1
1
10
V
R
(V)
10
2
f = 1 MHz; T
j
= 25
C.
Fig 1.
10
3
I
R
(nA)
10
2
Diode capacitance as a function of reverse voltage; typical values.
mlc816
10
−3
mlc815
TC
d
(K
−1
)
10
−4
10
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 2.
Reverse current as a function of junction
temperature; maximum values.
Fig 3.
Temperature coefficient of diode capacitance
as a function of reverse voltage; typical
values.
BB178
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 5 September 2011
3 of 8
NXP Semiconductors
BB178
VHF variable capacitance diode
7. Package outline
Plastic surface-mounted package; 2 leads
SOD523
A
c
HE
v
M
A
D
A
0
0.5
scale
1 mm
1
E
bp
2
DIMENSIONS (mm are the original dimensions)
UNIT
mm
A
0.65
0.58
bp
0.34
0.26
c
0.17
0.11
D
1.25
1.15
E
0.85
0.75
HE
1.65
1.55
v
0.1
(1)
Note
1. The marking bar indicates the cathode.
OUTLINE
VERSION
SOD523
REFERENCES
IEC
JEDEC
JEITA
SC-79
EUROPEAN
PROJECTION
ISSUE DATE
02-12-13
06-03-16
Fig 4.
Package outline SOD523 (SC-79).
BB178
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 5 September 2011
4 of 8
NXP Semiconductors
BB178
VHF variable capacitance diode
8. Revision history
Table 6.
BB178 v.3
Modifications:
Revision history
Release date
20110905
Data sheet status
Product data sheet
Change notice
-
Supersedes
BB178 v.2
Document ID
•
•
•
The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
Legal texts have been adapted to the new company name where appropriate.
Package outline drawings have been updated to the latest version.
Product data sheet
Product specification
-
-
BB178 v.1
-
BB178 v.2
(9397 750 13831)
BB178 v.1
(9397 750 02982)
20041103
19971113
BB178
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 5 September 2011
5 of 8
