DATA SH EET
Product specification
Supersedes data of 1996 May 03 1998 Sep 15
DISCRETE SEMICONDUCTORS
BB148
VHF variable capacitance diode
a
lfpage
M3D049
1998 Sep 15 2
Philips Semiconductors Product specification
VHF variable capacitance diode BB148
FEATURES
•Excellent linearity
•Excellent matching to 1% DMA
•Very small plastic SMD package
•C28: 2.6 pF; ratio: 15
•Low series resistance.
APPLICATIONS
•Electronic tuning in VHF television
tuners, band B up to 460 MHz
•VCO.
DESCRIPTION
The BB148 is variable capacitance
diode, fabricated in planar
technology, and encapsulated in the
SOD323 very small plastic SMD
package.
The excellent matching performance
is achieved by gliding matching and a
direct matching assembly procedure.
The diodes are delivered on tape in
several matched groups and are also
available unmatched upon request.
The unmatched type, BB158 has the
same specification.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER MIN. MAX. UNIT
VRcontinuous reverse voltage −30 V
IFcontinuous forward current −20 mA
Tstg storage temperature −55 +150 °C
Tjoperating junction temperature −55 +125 °C
Fig.1 Simplified outline (SOD323) and symbol.
Marking code: P8.
Cathode side indicated by a bar.
handbook, 4 columns
ka
MAM130
ELECTRICAL CHARACTERISTICS
Tj=25°C unless otherwise specified.
Note
1. VR is the value at which Cd= 12 pF.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
IRreverse current VR= 30 V; see Fig.3 −10 nA
VR=30V; T
j=85°C; see Fig.3 −200 nA
rsdiode series resistance f = 100 MHz; note 1 −0.9 Ω
Cddiode capacitance VR= 1 V; f = 1 MHz; see Figs 2 and 4 36.8 41.8 pF
VR= 28 V; f = 1 MHz; see Figs 2 and 4 2.4 2.75 pF
capacitance ratio f = 1 MHz 14.5 −
capacitance matching VR= 0.5 to 28 V; in a sequence of 4 diodes (gliding) −1%
V
R
= 0.5 to 28 V; in a sequence of 20 diodes (gliding) −2%
C
d1V()
C
d28V()
--------------------
Cd
∆Cd
----------
1998 Sep 15 3
Philips Semiconductors Product specification
VHF variable capacitance diode BB148
GRAPHICAL DATA
Fig.2 Diode capacitance as a function of reverse voltage; typical values.
f = 1 MHz; Tj=25°C.
handbook, full pagewidth
0
50
MLC266
102
101
10
20
30
40
10 1V (V)
R
Cd
(pF)
Fig.3 Reverse current as a function of junction
temperature; maximum values.
handbook, halfpage
1000
10
MLC816
102
103
50
IR
(nA)
T ( C)
jo
Fig.4 Temperature coefficient of diode
capacitance as a function of
reverse voltage; typical values.
handbook, halfpage
MLC815
11010
2
10
3
10
4
10
5
10
1
(K
−1
)
V (V)
R
d
TC
Tj= 0 to 85 °C.
1998 Sep 15 4
Philips Semiconductors Product specification
VHF variable capacitance diode BB148
PACKAGE OUTLINE
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
SOD323 98-09-14
0 1 2 mm
scale
SOD323
UNIT bpcDEQv
mm 0.40
0.25
+ 0.05
− 0.05 0.25
0.10 0.2
1.35
1.15
1.8
1.6
A
1.1
0.8
HE
2.7
2.3 0.25
0.15
Lp
0.45
0.15
DIMENSIONS (mm are the original dimensions)
D
12
H
E
L
p
A
E
b
p
A
1
Q
Note
1. The marking bar indicates the cathode.
A1
max.
Plastic surface mounted package; 2 leads
,
vMA
A
c
(1)
1998 Sep 15 5
Philips Semiconductors Product specification
VHF variable capacitance diode BB148
DEFINITIONS
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
Data sheet status
Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
1998 Sep 15 6
Philips Semiconductors Product specification
VHF variable capacitance diode BB148
NOTES
1998 Sep 15 7
Philips Semiconductors Product specification
VHF variable capacitance diode BB148
NOTES
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Printed in The Netherlands 115104/00/03/pp8 Date of release: 1998 Sep 15 Document order number: 9397 750 04377
