LESHAN RADIO COMPANY, LTD. UHF Variable Capacitance Diode FEATURES * Excellent linearity * Excellent matching to 0.5% DMA * Very small plastic SMD package * C28: 1.9 pF; ratio: 10. * Low series resistance. APPLICATIONS * Electronic tuning in UHF television tuners. * VCO. BB134 DESCRIPTION The BB134 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 a direct matching assembly procedure. The unmatched type, BB135 has the same specification. 1 2 SOD- 323 MARKING DIAGRAM P4 1 CATHODE 2 ANODE 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 PARAMETER CONDITIONS IR reverse current V R = 30 V; see Fig.2 VR = 30 V; Tj = 85 C; see Fig.2 rs Cd diode series resistance diode capacitance Cd( 0.5V ) Cd (28V ) MIN. MAX. UNIT - - 10 200 nA nA f = 470 MHz; note VR = 0.5 V; f = 1 MHz; see Figs 1 and 3 - 17.5 0.75 21 pF pF VR = 28 V;f = 1 MHz; see Figs 1 and 3 1.7 2.1 capacitance ratio f = 1 MHz 8.9 12 capacitance matching VR = 0.5 to 28 V; in a sequence of 4 diodes (gliding) - 0.5 % VR= 0.5 to 28 V; in a sequence of 15 diodes (gliding) - 2 % C d Cd Note 1. VR is the value at which Cd = 9 pF. BB134-1/2 LESHAN RADIO COMPANY, LTD. BB134 f = 1 MHz; Tj = 25 C. Fig.1 Diode capacitance as a function of reverse voltage; typical values. Tj = 0 to 85 C. Tj C. VR (V). Fig.2 Reverse current as a function of junction Fig.3 Temperature coefficient of diode temperature; maximum values. capacitance as a function of reverse voltage; typical values. BB134-2/2