EMI Filters KNF Series Features How to Order KNF 21 050 - W 3 • Distributed constant type LC filter. Prevents ringing caused by circuit impedance. Suitable for high speed digital circuits and video signal lines. • Stable noise attenuation over wide frequency ranges. • Low profile (T=0.95mm max.) suitable for miniature electronic equipments. • First class auto-placement RoHS Conforming Dimensions (Unit : mm) L Input Direction Mark q w e qSeries wSize EIA 21 :0805 eFrequency 025 050 100 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 25MHz 50MHz 100MHz r t (EIAJ) (2012) 200 400 200MHz 400MHz rTaping Direction (See Fig 1) W: Standard tQuantity per Reel 3 3000pcs Specifications Part Number Cut off Freq. (MHz) Capacitance 20dB Attenuation Rated Rated (+50/-20%) (Typical) current(mA) voltage(VDC) (pF) KNF21025 25MHz 235pF 200– 600MHz KNF21050 50MHz 130pF 350– 850MHz KNF21100 100MHz 65pF 450– 950MHz KNF21200 200MHz 33pF 700–1200MHz KNF21400 400MHz 17pF 900–1400MHz W IN OUT T GND Q KNF21 L 2.0±0.2 W 1.25±0.2 T 0.8±0.15 Q 0.4±0.3 ∗Cut off Frequency at Attenuation typical 3dB, Max 6dB Operating Temperature: -25 to 85(°C) Frequency Characteristics KNF21 Series 10 0 IN OUT -10 KNF21025 KNF21050 -20 GND KNF21100 KNF21200 KNF21400 -30 -40 -50 Equivalent Circuit 1 10 100 Frequency(MHz) 1000 10000 150mA 25VDC EMI Filters KNF Series <Impedance Matching Free> Output Waveform(Clock frequency 25MHz) • Stable attenuation against impedance change • Good impedance matching without ringing on distortion even at the time of IC ON/OFF and pattern layout change R LC filter KNF21100 1MΩ Test circuit LVC74 LVC04 filter R 25MHz 300Ω Test point <No Ringing> Excellent Impedance Matching KNF series Output waveform LC filter Output waveform • Wide attenuation up to high frequency range without distortion No filter Output waveform Wide Attenuation Bandwidth KNF21100 LC Filter (T-Type) LVC74 filter 50mm 25MHz 120 100 80 Original 60 Filter passed 40 25 Spectrum att.(dBuV) Spectrum att.(dBuV) 120 Test Circuit 100 Original 80 60 Filter passed 40 125 225 325 425 525 625 725 825 925 Frequency(MHz) 25 125 225 325 425 525 625 725 825 925 Frequency(MHz) Test point Recommended Land Pattern (Unit : mm) Packaging Specification (Fig.1) • Taping (3,000/reel) Through Hole D Resist (Unit : mm) R 8.0 W Q U S Taping Direction(W) W(Standard) 4.0 P T KNF21 3.20 C Conductor T Resist W R 2.30 1.00 C P 1.20 0.80 Q 0.40 S Direction of Feed D U 0.60 0.3-0.4 2.00