vhf variable capacitance diode BB148 features excellent linearity excellent matching to 1% dma very small plastic smd package c28: 2.6 pf; ratio: 15 low series resistance. applications electronic tuning in vhf television tuners, band b up to 460 mhz vco. description the BB148 is 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 diodes are delivered on tape in several matched groups and are also available unmatched upon request. the unmatched type, bb158 has the same specification. limiting values in accordance with the absolute maximum rating system (iec 134). symbol parameter min. max. unit v r continuous reverse voltage - 30 v i f continuous forward current - 20 ma t stg storage temperature - 55 +150 c t j operating junction temperature - 55 +125 c fig.1 simplified outline (sod323) and symbol. marking code: p8. cathode side indicated by a bar. handbook, 4 columns ka mam130 electrical characteristics t j =25 c unless otherwise speci?ed. note 1. v r is the value at which c d = 12 pf. symbol parameter conditions min. max. unit i r reverse current v r = 30 v; see fig.3 - 10 na v r =30v; t j =85 c; see fig.3 - 200 na r s diode series resistance f = 100 mhz; note 1 - 0.9 w c d diode capacitance v r = 1 v; f = 1 mhz; see figs 2 and 4 36.8 41.8 pf v r = 28 v; f = 1 mhz; see figs 2 and 4 2.4 2.75 pf capacitance ratio f = 1 mhz 14.5 - capacitance matching v r = 0.5 to 28 v; in a sequence of 4 diodes (gliding) - 1% v r = 0.5 to 28 v; in a sequence of 20 diodes (gliding) - 2% c d1v () c d28v () -------------------- c d d c d ---------- email: info@olitech-elec.com website: www.olitech-elec.com olitech electronics co. ltd. page:p3-p1
vhf variable capacitance diode BB148 graphical data fig.2 diode capacitance as a function of reverse voltage; typical values. f = 1 mhz; t j =25 c . handbook, full pagewidth 0 50 mlc266 10 2 10 1 10 20 30 40 10 1 v (v) r c d (pf) fig.3 reverse current as a function of junction temperature; maximum values. handbook, halfpage 100 0 10 mlc816 10 2 10 3 50 i r (na) t ( c) j o fig.4 temperature coefficient of diode capacitance as a function of reverse voltage; typical values. handbook, halfpage mlc815 11010 2 10 3 10 4 10 5 10 1 (k - 1 ) v (v) r d tc t j = 0 to 85 c. email: info@olitech-elec.com website: www.olitech-elec.com olitech electronics co. ltd. page: p3-p2
vhf variable capacitance diode BB148 package outline references outline version european projection issue date iec jedec eiaj sod323 98-09-14 0 1 2 mm scale sod323 unit b p cd e qv mm 0.40 0.25 + 0.05 - 0.05 0.25 0.10 0.2 1.35 1.15 1.8 1.6 a 1.1 0.8 h e 2.7 2.3 0.25 0.15 l p 0.45 0.15 dimensions (mm are the original dimensions) d 12 h e l p a e b p a 1 q note 1. the marking bar indicates the cathode. a 1 max. plastic surface mounted package; 2 leads v m a a c (1) email: info@olitech-elec.com website: www.olitech-elec.com olitech electronics co. ltd. page: p3 - p3
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