EMI Filters KNF21 Series Features * Distributed constant type LC filter. Prevents ringing caused by circuit impedance. * Stable noise attenuation over wide frequency range. * Low profile (T=0.95mm max.) suitable for miniature electronic equipments. * First class auto-placement How to Order KNF 21 100 C65 DA 3T S 21 Cut off Capacitance Frequency (+50/ -20%) Attenuation (Typical) 2012 (EIA: 0805) 25MHz 50MHz 100MHz 200 400 200MHz 400MHz C130 C235 130pF 235pF Capacitance C17 C33 C65 Specifications Part Number Cut off Frequency 025 050 100 * PCs, Laser Printers, Cellular Phone, Clock Data Lines for LCD Display * High Speed Video Signal Circuits and Interface Circuits * High Speed Digital Circuits Series Size Code Applications RoHS Compliant Rated Rated Operating Current Voltage Temperature 17pF 33pF 65pF Application DA Digital Circuit in General KNF21025C235DA3TS 25MHz 235pF 200 to 600MHz (@20dB) 150mA 25VDC Packaging KNF21050C130DA3TS 50MHz 130pF 350 to 850MHz (@20dB) 150mA 25VDC KNF21100C65DA3TS 100MHz 65pF 450 to 950MHz (@20dB) 150mA 25VDC -25 to +85C Termination S KNF21200C33DA3TS 200MHz 33pF 700 to 1200MHz (@20dB) 150mA 25VDC KNF21400C17DA3TS 400MHz 17pF 900 to 1400MHz (@20dB) 150mA 25VDC 3T T&R: 3000 pcs. (Std.) Std. * Storage condition Temperature: -10 to +45C Humidity: 45 to 75%RH Dimensions Attenuation Characteristics (Unit: mm) L KNF21 Series R W 10 0 Attenuation (dB) OUT Input Direction Mark T IN P G P -10 KNF21025C235DA -20 KNF21050C130DA KNF21100C65DA -30 KNF21200C33DA -40 CODE L W T Dimensions 2.000.20 1.250.20 0.800.15 CODE G P R 0.01 Dimensions 0.400.30 0.300.20 -50 KNF21400C17DA 1 10 100 1000 10000 Frequency (MHz) Recommended Land Pattern (Unit: mm) Packaging Specification * Taping (3,000/ reel) (Unit: mm) 4HROUGH (OLE $ Taping Direction (W) 2 8.0 7 1 5 3 2ESIST 0 CODE T Dimensions 3.20 # #ONDUCTOR 4 2ESIST W 2.30 4.0 W (Standard) Direction of Feed R 1.00 C 1.20 P 0.80 Q 0.40 S 0.60 D 0.3 to 0.4 U 2.00 EMI Filters KNF21 Series <Impedance Matching Free> Output Waveform (Clock frequency 25MHz) * Stable attenuation against impedance change * Good impedance matching without ringing or distortion even at the time of IC ON/ OFF and pattern layout change R LC filter KNF21100 1M Test circuit ,6# ,6# FILTER 2 -(Z 300 4EST POINT <No Ringing> Excellent Impedance Matching LC filter Output waveform * Wide attenuation up to high frequency range without distortion No filter Output waveform Attenuation Bandwidth KNF21100 Test Circuit FILTER MM 3PECTRUM ATT D"U6 ,6# LC Filter (T-Type) 120 /RIGINAL &ILTER PASSED -(Z 4EST POINT &REQUENCY -(Z Spectrum att. (dBuV) KNF series Output waveform 100 /RIGINAL 80 60 Filter passed 40 25 125 225 325 425 525 625 725 825 925 Frequency (MHz)