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LESHAN RADIO COMPANY, LTD.
VHF variable capacitance diode
FEATURES * Excellent linearity * Ultra small plastic SMD package * C28: 1 pF; ratio: 14. APPLICATIONS * Electronic tuning in satellite tuners * Tuneable coupling * Voltage controlled oscillators (VCO). DESCRIPTION The BB181 is a variable capacitance diode, fabricated in planar technology and encapsulated in the SOD523 (SC-79) ultra small plastic SMD package.
BB 181
1
2
SOD523 SC-79
MARKING CODE:N
N
UNIT V mA C C MAX. 10 200 3 17 1.055 16 UNIT nA nA pF pF
1 CATHODE
2 ANODE
1
2
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VR IF T stg Tj PARAMETER continuous reverse voltage continuous forward current storage temperature operating junction temperature MIN. - - - 55 - 55 MAX. 30 20 +150 +150
ELECTRICAL CHARACTERISTICS T j =25C unless otherwise specified. SYMBOL IR rs Cd C d(0.5V) C d(28V ) PARAMETER reverse current diode series resistance diode capacitance CONDITIONS V R = 30 V; see Fig.2 V R =30 V; Tj =85C; see Fig.2 f = 470 MHz; note 1 MIN. - - -
V R = 0.5 V; f = 1 MHz; see Figs 1 and 3 8 V R = 28 V; f = 1 MHz; see Figs 1 and 3 0.7 f = 1 MHz 12
capacitance ratio
Note 1. V R is the value at which Cd = 9 pF.
BB181-1/2
LESHAN RADIO COMPANY, LTD.
BB 181
15
C d ( pF )
10
5
f = 1 MHz; T j =25C
0 10 -1 1 10 10 2
V R( V )
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
10 3
10 -3
I R (nA)
TC d ( K -1 )
10 2
10 -4
T j = 0 to 85 C. 10 0 50 100 10 -5 10 -1 1 10 10 2
T j ( C )
V R( V )
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.
BB181-2/2

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