BB844
Silicon Variable Capacitance Diode
• For FM radio tuner with extended frequency
band 77MHz to 108MHz
• Designed for application requiring back-to-back
diode configuration for optimum signal
distortion and detuning
• High tuning ratio at low supply
voltage (car radio)
• Monolitic chip (common cathode) for perfect
dual diode tracking
• Good C- V linearity
• High figure of merit
• Pb-free (RoHS compliant) package
BB844
!
,
,
Type
BB844
Package
SOT23
Configuration
common cathode
LS(nH)
1.8
Marking
SNs
Maximum Ratings at T A = 25°C, unless otherwise specified
Parameter
Symbol
Diode reverse voltage
VR
18
Peak reverse voltage
VRM
20
Forward current
IF
50
mA
Operating temperature range
Top
-55 ... 150
°C
Storage temperature
Tstg
-55 ... 150
1
Value
Unit
V
2011-06-15
BB844
Electrical Characteristics at T A = 25°C, unless otherwise specified
Symbol
Parameter
Values
min.
typ.
Unit
max.
DC Characteristics
Reverse current
IR
nA
VR = 16 V
-
-
20
VR = 16 V, TA = 85 °C
-
-
200
AC Characteristics
Diode capacitance
pF
CT
VR = 2 V, f = 1 MHz
42.5
43.75
45
VR = 4 V, f = 1 MHz
25
27
29
VR = 8 V, f = 1 MHz
10
11.5
13
CT2 /CT8
3.2
3.8
-
∆CT/CT
-
-
1.5
%
rS
-
0.28
-
Ω
Capacitance ratio
VR = 2 V, VR = 8 V, f = 1 MHz
Capacitance matching1)
VR = 2V to 8V , f = 1 MHz
Series resistance
VR = 2 V, f = 100 MHz
1For
details please refer to Application Note 047.
2
2011-06-15
BB844
Diode capacitance CT = ƒ (VR)
Capacitance ratio CTref/CT = ƒ (VR)
f = 1MHz
f = 1MHz
5
90
pF
CTref/CT
70
CT
CT1V/CT
4
60
3.5
CT2V/CT
3
50
2.5
40
2
30
1.5
CT8V/CT
20
1
10
0.5
0 -1
10
10
0
10
1
V
10
0
0
2
VR
1
2
3
4
5
6
7
8
V
10
VR
Temperature coefficient of the diode
capacitance TCc = ƒ (VR)
0.0006
1/C°
TCc
0.0005
0.00045
0.0004
0.00035
0.0003
0.00025
0.0002
1
2
3
4
5
6
7
8
V
10
VR
3
2011-06-15
Package SOT23
BB844
0.4 +0.1
-0.05
1)
2
0.08...0.1
C
0.95
1.3 ±0.1
1
2.4 ±0.15
3
0.1 MAX.
10˚ MAX.
B
1 ±0.1
10˚ MAX.
2.9 ±0.1
0.15 MIN.
Package Outline
A
5
0...8˚
1.9
0.2
0.25 M B C
M
A
1) Lead width can be 0.6 max. in dambar area
Foot Print
0.8
0.9
1.3
0.9
0.8
1.2
Marking Layout (Example)
Manufacturer
EH s
2005, June
Date code (YM)
Pin 1
BCW66
Type code
Standard Packing
Reel ø180 mm = 3.000 Pieces/Reel
Reel ø330 mm = 10.000 Pieces/Reel
4
0.2
8
2.13
2.65
0.9
Pin 1
1.15
3.15
4
2011-06-15
BB844
Edition 2009-11-16
Published by
Infineon Technologies AG
81726 Munich, Germany
2009 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee
of conditions or characteristics. With respect to any examples or hints given herein,
any typical values stated herein and/or any information regarding the application of
the device, Infineon Technologies hereby disclaims any and all warranties and
liabilities of any kind, including without limitation, warranties of non-infringement of
intellectual property rights of any third party.
Information
For further information on technology, delivery terms and conditions and prices,
please contact the nearest Infineon Technologies Office ().
Warnings
Due to technical requirements, components may contain dangerous substances.
For information on the types in question, please contact the nearest Infineon
Technologies Office.
Infineon Technologies components may be used in life-support devices or systems
only with the express written approval of Infineon Technologies, if a failure of such
components can reasonably be expected to cause the failure of that life-support
device or system or to affect the safety or effectiveness of that device or system.
Life support devices or systems are intended to be implanted in the human body or
to support and/or maintain and sustain and/or protect human life. If they fail, it is
reasonable to assume that the health of the user or other persons may be
endangered.
5
2011-06-15
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