BB181

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 Ω 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 =25°C 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 =85°C; 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 =25°C 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