part cut off frequency capacitance (+50/-20%) 20db attenuation rated rated number (mhz) (pf) (typical) current (ma) voltage (vdc) knf32025 25mhz 235pf 200 - 600 mhz knf32050 50mhz 130pf 350 - 850 mhz knf32100 100mhz 65pf 450 - 950 mhz 200ma knf32200 200mhz 33pf 700 - 1200 mhz knf21025 25mhz 235pf 200 - 600 mhz 25vdc knf21050 50mhz 130pf 350 - 850 mhz knf21100 100mhz 65pf 450 - 950 mhz 150ma knf21200 200mhz 33pf 700 - 1200 mhz knf21400 400mhz 17pf 900 - 1400 mhz emi filters knf series w t l q input direction mark out in gnd features ?disturbed constant type lc filter. prevents ringing caused by circuit impedance. suitable for high speed digital circuits and visual line circuits. ?stable noise attenuation over wide frequency ranges ?low profile (h=0.95mm max.) suitable for miniature electronic equipment ?first class auto-placement applications ?pcs, laser printers, cellular phone, clock data lines for lcd display ?high speed video signal circuits and interface circuits ?high speed digital circuits ?anti-noise solution achieves effective noise suppression in noisy high speed circuits without signal waveform distortion quantity per reel 3 = 3,000 pcs t aping direction (see table 1) w = standard x = option frequency 025 = 25mhz 200 = 200mhz 050 = 50mhz 400 = 200mhz 100 = 100mhz size eia (eiaj) 32 = 1206 (3216) 21 = 0805 (2012) series how to order knf - 21 050 - w 3 dimensions millimeters (inches) in out gnd attenuation(db) frequency(mhz) -50 -40 -30 -20 -10 0 10 11 0 100 1000 10000 knf32200 knf32100 knf32050 knf32025 frequency characteristics knf32 series knf21 series equivalent circuit specifications lwtq knf32 3.20?.20 1.60?.20 1.00?.20 0.60?.30 (0.126?.008) (0.063?.008) (0.039?.008) (0.024?.012) knf21 2.00?.20 1.25?.20 0.80?.15 0.40?.30 (0.079?.008) (0.049?.008) (0.031?.006) (0.016?.012) cut off frequency at attenuation typical 3db, max 6db operating temperature = -25 to 85(?) frequency(mhz) attenuation(db) -50 -40 -30 -20 -10 0 10 11 0 100 1000 10000 knf21400 knf21200 knf21100 knf21050 knf21025 59
60 emi filters knf series ?stable attenuation against impedance change ?good impedance matching without ringing on distortion even at the time of ic on/off and pattern layout change ?wide attenuation up to high frequency range without distortion r lc filter knf21100 1m ? 300 ? r 25mhz test point lvc04 filter lvc74 test circuit test point filter lvc74 50mm 25mhz test circuit output wave form (clock frequency 25mhz) knf series output wave form lc filter output wave form no filter output wave form knf21100 series lc filter (t-type) - excellent impedance matching wide attenuation bandwidth 25 120 100 80 60 40 925 825 725 625 525 frequency(mhz) spectrum att.(dbuv) 425 325 225 125 original filter passed 25 120 100 80 60 40 925 825 725 625 525 frequency(mhz) spectrum att.(dbuv) 425 325 225 125 original filter passed recommended land pattern packaging specification (table 1) w(standard) direction of feed taping direction(w, x) x(option) 4.0 (0.157) 8.0 (0.315) p c t s q through hole d resist resist r w conductor u mm (inches) t aping = 3000/reel mm (inches) twrc pqs d u knf21 3.20 2.30 1.00 1.20 0.80 0.40 0.60 0.30-0.40 2.00 (0.126) (0.091) (0.039) (0.047) (0.031) (0.016) (0.024) (0.012-0.016) (0.079) knf32 4.40 3.00 1.40 2.50 1.20 0.60 0.60 0.50 2.40 (0.173) (0.118) (0.055) (0.098) (0.047) (0.024) (0.024) (0.020) (0.094)
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