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LESHAN RADIO COMPANY, LTD.
Low-voltage variable capacitance diode
FEATURES * Ultra small plastic SMD package * C4: 2.75 pF; ratio: 2.4 * Low series resistance. APPLICATIONS * Voltage controlled oscillators (VCO). DESCRIPTION The BB145B is a planar technology variable capacitance diode in a SOD523 (SC-79) package.
BB 145B
1
2
SOD523 SC-79 MARKING CODE:Z
Z
MAX. 6 8 20 +150 +150 UNIT V V mA C C MAX. 10 200 0.6 7.2 2.95 nA nA pF pF -
1 CATHODE
2 ANODE
1
2
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VR V RM IF T stg Tj PARAMETER continuous reverse voltage peak reverse voltage continuous forward current storage temperature operating junction temperature in series with a 10 k resistor CONDITIONS MIN. - - - -55 -55
ELECTRICAL CHARACTERISTICS T j =25C unless otherwise specified. SYMBOL IR rs Cd PARAMETER reverse current diode series resistance diode capacitance CONDITIONS V R = 6 V; see Fig.2 V R =6 V; T j =85C; see Fig.2 f = 470 MHz; V R =1 V V R = 1 V; f = 1 MHz; see Figs 1 and 3 V R = 4 V; f = 1 MHz; see Figs 1 and 3 C d ( 1V) C d ( 4V) capacitance ratio f = 1 MHz 2.2 MIN. - - - 6.4 2.55 UNIT
BB145B-1/2
LESHAN RADIO COMPANY, LTD.
BB 145B
10
8
C d ( pF )
6
4
2
f = 1 MHz; T j =25C
0 10 -1 1 10
V R( V )
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
10 3
10 -3
I R (nA)
10 0 50 100 10 -4 10 -1 1 10
T j ( C )
TC d ( K -1 )
10 2
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.
BB145B-2/2

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