d a t a sh eet BB178 m3d319 product specification 1 of 2 4008-318-123 sales@twtysemi.com http://www.twtysemi.com
features excellent linearity excellent matching to 2% dma ultra small plastic smd package c28: 2.6 pf; ratio: 15 very low series resistance. applications electronic tuning in vhf television tuners, band b up to 460 mhz voltage controlled oscillators (vco). description the BB178 is a planar technology variable capacitance diode, in a sod523 (sc-79) package. the excellent matching performance is achieved by gliding matching and a direct matching assembly procedure. pinning pin description 1 cathode 2 anode fig.1 simplified outline (sod523; sc-79) and symbol. handbook, 2 columns 12 mbk441 8 marking code: 8. orientation of marking code as shown. cathode side indicated by a bar. limiting values in accordance with the absolute maximum rating system (iec 134). electrical characteristics t j =25 c unless otherwise speci?ed. symbol parameter conditions min. max. unit v r continuous reverse voltage - 32 v v rm peak reverse voltage in series with a 10 k w resistor - 35 v i f continuous forward current - 20 ma t stg storage temperature - 55 +150 c t j operating junction temperature - 55 +125 c symbol parameter conditions min. typ. max. unit i r reverse current v r = 30 v; see fig.3 -- 10 na v r = 30 v; t j =85 c; see fig.3 -- 200 na r s diode series resistance f = 100 mhz; v r is the value at which c d =30pf - 0.65 0.8 w c d diode capacitance v r = 1 v; f = 1 mhz; see figs 2 and 4 34.65 - 42.35 pf v r = 28 v; f = 1 mhz; see figs 2 and 4 2.361 - 2.754 pf capacitance ratio f = 1 mhz - 1.3 - capacitance ratio f = 1 mhz 13.5 -- capacitance ratio f = 1 mhz - 1.08 - capacitance matching v r = 1 to 28 v; in a sequence of 15 diodes (gliding) -- 2% c d1v () c d2v () ----------------- - c d1v () c d28v () -------------------- c d25v () c d28v () -------------------- c d d c d ---------- product specification 2 of 2 4008-318-123 sales@twtysemi.com http://www.twtysemi.com BB178
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