unisonic technologies co., ltd BB179 preliminary diode www.unisonic.com.tw 1 of 2 copyright ? 2011 unisonic technologies co., ltd qw-r601-033.a uhf variable capacitance diode ? description the utc BB179 is a planar technology variable capacitance diode providing the designers exce llent matching performance, low series resistance and great linearity. the utc BB179 is suitable for vco (voltage controlled oscillators) and electronic tuning in uhf (very high frequency) tuners. ? features * excellent matching to 2% dma * low series resistance. * great linearity * c28: 2.1 pf; ratio: 9 sod-523 1 2 ? ordering information ordering number pin assignment lead free halogen free package 1 2 packing BB179l-cc2-r BB179g-cc2-r sod-523 a k tape reel note: pin assignment: a: anode, k: cathode ? marking 79 g: halogen free l : lead free
BB179 preliminary diode unisonic technologies co., ltd 2 of 2 www.unisonic.com.tw qw-r601-033.a ? absolute maximum ratings parameter symbol ratings unit continuous reverse voltage v r 30 v peak reverse voltage (in series with a 10 k ? resistor) v rm 35 v continuous forward current i f 20 ma storage temperature t stg -40~+150 c operating junction temperature t j -40~+125 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (t j =25c unless otherwise specified.) parameter symbol test conditions min typ max unit v r = 30 v 10 na reverse current i r v r = 30 v, t j =85 c 200 na diode series resistance r s f = 470 mhz, v r is the value at which c d =9pf 0.6 0.75 ? v r = 1 v, f = 1 mhz 18.22 21.26 pf diode capacitance c d v r = 28 v, f = 1 mhz 1.951 2.225 pf capacitance ratio d(2v) d(1v) c c f = 1 mhz 1.27 capacitance ratio d(28v) d(1v) c c f = 1 mhz 8.45 10.9 capacitance ratio d(28v) d(25v) c c f = 1 mhz 1.05 capacitance matching d d c c v r = 1~28 v, in a sequence of 15 diodes (gliding) 2 % utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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