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BB178
VHF variable capacitance diode
1. Product profile
1.1 General descriptionThe 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 Cd(28V): 2.6 pF; Cd(1V) to Cd(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[1] The marking bar indicates the cathode.
3. Ordering information
BB178
VHF variable capacitance diode
Rev. 3 — 5 September 2011 Product data sheet
Table 1. Pinning
Table 2. Ordering informationBB178 SC-79 plastic surface mounted package; 2 leads SOD523
NXP Semiconductors BB178
VHF variable capacitance diode
4. Marking
5. Limiting values
6. Characteristics[1] VR is the value at which Cd = 30pF.
Table 3. MarkingBB178 8
Table 4. Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134). reverse voltage - 32 V
VRM peak reverse voltage in series with a k resistor
-35 V forward current - 20 mA
Tstg storage temperature 55 +150 C junction temperature 55 +125 C
Table 5. CharacteristicsTj = 25 C unless otherwise specified. reverse current see Figure2=30V --10 nA =30V; Tj =85C - - 200 nA diode series
resistance= 100 MHz [1] -0.65 0.8 diode
capacitance=1 MHz; see Figure1
and Figure3=1V 34.65 - 42.35 pF=28V 2.361 2.6 2.754 pF
capacitance ratiof=1 MHz - 1.3 -
capacitance ratiof=1 MHz 13.5 15 -
capacitance ratiof=1 MHz - 1.08 -
capacitance
matching=1 V to28 V; in a
sequence of 10 diodes
(gliding)
--2 %
NXP Semiconductors BB178
VHF variable capacitance diode
NXP Semiconductors BB178
VHF variable capacitance diode
7. Package outline
Fig 4. Package outline SOD523 (SC-79).
NXP Semiconductors BB178
VHF variable capacitance diode
8. Revision history Table 6. Revision historyBB178 v.3 20110905 Product data sheet - BB178 v.2
Modifications:
• 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.
BB178 v.2
(9397 750 13831)
20041103 Product data sheet - BB178 v.1
BB178 v.1
(9397 750 02982)
19971113 Product specification - -
NXP Semiconductors BB178
VHF variable capacitance diode
9. Legal information
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Limiting values — Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent
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Objective [short] data sheet Development This document contains data from the objective specification for product development.
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