Philips BB170 Technical data
BB178
VHF variable capacitance diode
Rev. 02 — 3 November 2004 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
■ Excellent linearity
■ Excellent matching to 2 % DMA
■ Ultra small plastic SMD package
■ C
■ Very low series resistance.
d(28V)
: 2.6 pF; C
d(1V)
to C
d(28V)
ratio: 15
1.3 Applications
■ Electronic tuning in VHF television tuners, band B up to 460 MHz
■ Voltage Controlled Oscillators (VCO).
2. Pinning information
Table 1: Pinning
Pin Description Simplified outline
1 cathode
2 anode
[1] The marking bar indicates the cathode.
3. Ordering information
Table 2: Ordering information
Type number Package
BB178 SC-79 plastic surface mounted package; 2 leads SOD523
[1]
12
Top view
Name Description Version
Symbol
sym008
Philips Semiconductors
4. Marking
Table 3: Marking
Type number Marking code
BB178 8
5. Limiting values
Table 4: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
V
R
V
RM
I
F
T
stg
T
j
BB178
VHF variable capacitance diode
reverse voltage - 32 V
peak reverse voltage in series with a
10 kΩ resistor
forward current - 20 mA
storage temperature −55 +150 °C
junction temperature −55 +125 °C
-35V
6. Characteristics
Table 5: Characteristics
Tj = 25°C unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
I
R
r
s
C
d
C
d1V()
---------------- -
C
d2V()
C
d1V()
-------------------
C
d28V()
C
d25V()
-------------------
C
d28V()
Cd∆
----------
C
d
reverse current see Figure2
=30V --10nA
V
R
= 30 V; Tj=85°C - - 200 nA
V
R
diode series
f = 100 MHz
[1]
- 0.65 0.8 Ω
resistance
diode
capacitance
f = 1 MHz; see Figure 1
and
Figure 3
= 1 V 34.65 - 42.35 pF
V
R
= 28 V 2.361 2.6 2.754 pF
V
R
capacitance ratio f = 1 MHz - 1.3 -
capacitance ratio f = 1 MHz 13.5 15 -
capacitance ratio f = 1 MHz - 1.08 -
capacitance
matching
= 1 V to 28 V; in a
V
R
sequence of 10 diodes
--2%
(gliding)
[1] VR is the value at which Cd = 30 pF.
9397 750 13831 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 02 — 3 November 2004 2 of 7
Philips Semiconductors
BB178
VHF variable capacitance diode
50
C
d
(pF)
40
30
20
10
0
−1
10
101
f = 1 MHz; Tj=25°C.
Fig 1. Diode capacitance as a function of reverse voltage; typical values.
mlc816
10
TC
(K−1)
−3
d
I
(nA)
3
10
R
2
10
mbk438
2
V
(V)
R
10
mlc815
10
1
0 1008040 6020
T
(°C)
j
Fig 2. Reverse current as a function of junction
temperature; maximum values.
−4
10
−5
10
−1
10
110
VR (V)
2
10
Tj=0°C to 85 °C.
Fig 3. Temperature coefficient of diode capacitance
as a function of reverse voltage; typical values.
9397 750 13831 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 02 — 3 November 2004 3 of 7
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