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| LESHAN RADIO COMPANY, LTD. UHF variable capacitance diode BB 149 FEATURES * Excellent linearity * Excellent matching to 1% DMA * Very small plastic SMD package * C28: 2.1 pF; ratio 9 * Low series resistance. APPLICATIONS * Electronic tuning in UHF television tuners * VCO. 1 CATHODE DESCRIPTION The BB149 is a variable capacitance diode, fabricated in planar technology, and encapsulated in the SOD323 very small plastic SMD package. The excellent matching performance is achieved by gliding matching and a direct matching assembly procedure. The unmatched type, BB159 has the same specification. 1 2 SOD- 323 MARKING CODE:P9 2 ANODE P9 MIN. - - - 18 1.9 8.2 1.2 - - 10 200 0.75 19.5 2.25 10 - 1 2 % % 1 2 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER MIN. MAX. VR continuous reverse voltage - 30 IF continuous forward current - 20 Tstg storage temperature -55 +150 Tj operating junction temperature -55 +125 UNIT V mA C C ELECTRICAL CHARACTERISTICS Tj = 25 C unless otherwise specified. SYMBOL IR rs Cd Cd( 1V ) Cd (28V ) Cd( 19V ) Cd (28V ) Cd Cd PARAMETER reverse current diode series resistance diode capacitance capacitance ratio capacitance ratio capacitance matching CONDITIONS VR = 30 V; see Fig.2 VR = 30 V; Tj = 85 C; see Fig.2 f = 470 MHz; note 1 VR = 0.5 V; f = 1 MHz; see Figs 1 and 3 VR = 28 V;f = 1 MHz; see Figs 1 and 3 f = 1 MHz f = 1 MHz VR = 0.5 to 28 V; in a sequence of 4 diodes (gliding) VR= 0.5 to 28 V; in a sequence of 15 diodes (gliding) Note 1. VR is the value at which Cd = 9 pF. MAX. UNIT nA nA pF pF BB149-1/2 LESHAN RADIO COMPANY, LTD. BB 149 f = 1 MHz; Tj = 25 C. Fig.1 Diode capacitance as a function of reverse voltage; typical values. Tj = 0 to 85 C. 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. BB149-2/2 |
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