2 www.johanso n dielectrics.com the x2y ? design - a capacitive circuit x2y ? components share many common features with standard multi-layer ceramic capacitors (mlcc) for easy adoption by end-users. ? same component sizes (0603, 0805, 1206, etc.) ? same dielectric, electrode and termination materials ? same pick and place equipment ? same industry test standards for component reliability a standard multi-layer ceramic capacitor (mlcc) consists of opposing electrode layers a & b . the x2y ? design adds another set of electrode layers (g) which effectively surround each existing electrode of a two-terminal capacitor. the only external difference is two additional side terminations, creating a four-terminal capacitive circuit, which allows circuit designers a multitude of attachment options. experts agree that balance is the key to a quiet circuit. x2y? is a balanced circuit device with two equal halves, tightly matched in both phase and magnitude with respect to ground. several advantages are gained by two balanced capacitors sharing a single ceramic component body. ? exceptional common mode rejection ? effects of aging & temperature are equal on both caps ? effect of voltage variation eliminated ? matched line-to-ground capacitance common mode choke replacement in this example, a 5 h common mode choke is replaced by an 0805, 1000pf x2y ? component acheiving superior emi filtering by a component a fraction of the size and cost. dc motor emi reduction: a superior solution one x2y ? component has successfully replaced 7 discrete filter components while achieving superior emi filtering. inamp input filter example in this example, a single johanson x2y ? component was used to filter noise at the input of a dc instrumentation amplifier. this reduced component count by 3-to-1 and costs by over 70% vs. conventional filter components that included 1% film y-capacitors. parameter x2y ? 10nf discrete 10nf, 2 @ 220 pf comments dc offset shift < 0.1 v < 0.1 v referred to input common mode rejection 91 db 92 db source: analog devices, a designers guide to instrumentation amplifiers (2nd edition) by charles kitchin and lew counts x2y ? circuit 1: filtering when used in circuit 1 configuration the x2y ? filter capacitor is connected across two signal lines. differential mode noise is filtered to ground by the two y capacitors, a & b. common mode noise is cancelled within the device. common mode choke 9.0 x 6.0 x 5.0 mm x2y ? 2.0 x 1.3 x 1.0 mm no filter cmc 5uh x2y? 1000pf ambient g1 g2 a b signal 1 signal 2 ground x2y ? f i l t e r & d e c o u p l i n g c a p a c i t o r s a g1 g2 b
3 www.johanso n dielectrics.com ? exceptional common mode rejection ? effects of aging & temperature are equal on both caps ? effect of voltage variation eliminated ? matched line-to-ground capacitance ? low esl (device only and mounted) ? broadband performance ? effective on pcb or package ? lower via count, improves routing ? reduces component count ? lowers placement cost x2y ? circuit 2: decoupling when used in circuit 2 configuration, a & b capacitors are placed in parallel effectively doubling the apparent capacitance while maintaining an ultra-low inductance. the low inductance advantages of the x2y? capacitor circuit enables high-performance bypass networks at reduced system cost. mounted performance system performance 1:5 mlcc replacement example x2ys ? proven technology enables end-users to use one x2y capacitor to replace five conventional mlccs in a typical high performance ic bypass design. vias are nearly cut in half, board space is reduced and savings are in dollars per pcb. 104 mlcs 0402 47nf 20 x2y ? 0603 100nf transfer impedance seen by fpga mutual coupling from opposing polarity vias lowers inductance when mounted on a pcb. component performance the x2y ? has short, multiple and opposing current paths resulting in lower device inductance. power ground g1 g2 a b x2y ? f i l t e r & d e c o u p l i n g c a p a c i t o r s
4 www.johanso n dielectrics.com x2y ? f i l t e r & d e c o u p l i n g c a p a c i t o r s x2y ? filter capacitors employ a unique, patented low inductance design featuring two balanced capacitors that are immune to temperature, voltage and aging performance differences. these components offer superior decoupling and emi filtering performance, virtually eliminate parasitics, and can replace multiple capacitors and inductors saving board space and reducing assembly costs. a d v a n t a g e s ? one device for emi suppression or decoupling ? replace up to 7 components with one x2y ? differential and common mode attenuation ? matched capacitance line to ground, both lines ? low inductance due to cancellation effect a p p l i c a t i o n s ? fpga / asic / -p decoupling ? ddr memory decoupling ? amplifier filter & decoupling ? high speed data filtering ? cellular handsets cross-sectional view g g a b equivalent circuits g1 a g2 b dimensional view eb cb l w t eb cb l w t x2y ? technology patents and registered trademark under license from x2y attenuators, llc circuit 1 (y cap.) <10pf 10pf 22pf 27pf 33pf 47pf 100pf 220pf 470pf 1000pf 1500pf 2200pf 4700pf .010f .022f .047f 0.10f 0.18f 0.22f 0.33f 0.40f 0.47f 1.0f circuit 2 (2*y cap.) <20pf 20pf 44pf 54pf 66pf 94pf 200pf 440pf 940pf 2000pf 3000pf 4400pf 9400pf .020f .044f .094f 0.20f 0.36f 0.44f 0.68f 0.80f 0.94f 2.0f size cap. code xrx 100 220 270 330 470 101 221 471 102 152 222 472 103 223 473 104 184 224 334 404 474 105 0402 npo 50 50 50 50 50 50 50 50 x7r 50 50 50 50 50 50 16 0603 npo 1* 1* 1* 1* 1* 50 50 50 x7r 1* 1* 1* 1* 1* 1* 1* 1* 50 25 16 10 6 0805 npo 1* 1* 1* 1* 1* 1* 1* 1* 50 x7r 1* 1* 1* 1* 1* 50 50 25 16 1206 npo voltage ratings 6 = 6.3 vdc 10 = 10 vdc 16 = 16 vdc 25 = 25 vdc 50 = 50 vdc 1* = 100 vdc 1* x7r 1* 1* 1* 1* 50 25 16 1210 x7r 1* 1* 50 16 1410 x7r 1* 1812 x7r 1* 1* 1* circuit 1 capacitance (balanced filtering) = a (or b) to g circuit 2 capacitance (decoupling) = a + b to g rated voltage is for a or b to ground. contact factory for part combinations not shown.
5 www.johanso n dielectrics.com x2y ? f i l t e r & d e c o u p l i n g c a p a c i t o r s m e c h a n i c a l c h a r a c t e r i s t i c s 0402 (x07) 0603 (x14) 0805 (x15) 1206 (x18) 1210 (x41) 1410 (x44) 1812 (x43) in mm in mm in mm in mm in mm in mm in mm l 0.045 0.003 1.143 0.076 0.064 0.005 1.626 0.127 0.080 0.008 2.032 0.203 0.124 0.010 3.150 0.254 0.125 0.010 3.175 0.254 0.140 0.010 3.556 0.254 0.174 0.010 4.420 0.254 w 0.024 0.003 0.610 0.076 0.035 0.005 0.889 0.127 0.050 0.008 1.270 0.203 0.063 0.010 1.600 0.254 0.098 0.010 2.489 0.254 0.098 0.010 2.490 0.254 0.125 0.010 3.175 0.254 t 0.020 max 0.508 max 0.026 max 0.660 max 0.040 max 1.016 max 0.050 max 1.270 max 0.070 max 1.778 max 0.070 max 1.778 max 0.090 max 2.286 max eb 0.008 0.003 0.203 0.076 0.009 0.004 0.229 0.102 0.009 0.004 0.229 0.102 0.009 0.004 0.229 0.102 0.009 0.005 0.229 0.127 0.009 0.005 0.229 0.127 0.009 0.005 0.229 0.127 cb 0.010 0.003 0.305 0.076 0.018 0.004 0.457 0.102 0.022 0.005 0.559 0.127 0.040 0.005 1.016 0.127 0.045 0.005 1.143 0.127 0.045 0.005 1.143 0.127 0.045 0.005 1.143 0.127 power ground g1 g2 a b filtering circuit 1 s21 signal-to-ground decoupling circuit 2 s21 power-to-ground g1 g2 a b signal 1 signal 2 ground additional test data and related information available at www.johansondielectrics.com/x2y/ 25.0 2.50 0.25 .025 25.0 2.50 0.25 .025 impedance ( ) impedance ( ) h o w t o o r d e r x2y ? f i l t e r & d e c o u p l i n g c a p a c i t o r s p/n written: 6r3x14w104mv4t voltage 6r3 = 6.3 v 100 = 10 v 160 = 16 v 250 = 25 v 500 = 50 v 101 = 100 v marking 4 = unmarked dielectric n = npo w = x7r capacitance 1st two digits are significant; third digit denotes number of zeros. 474 = 0.47 f 105 = 1.00 f tolerance m = 20% case size x07 = 0402 x14 = 0603 x15 = 0805 x18 = 1206 x41 = 1210 x43 = 1812 x44 = 1410 4 termination v = ni barrier w/ 100% sn plating v w x14 100 104 m tape modifier code tape reel e embossed 7 t paper 7 tape specs. per eia rs481 t
s o l d e r p a d r e c o m m e n d a t i o n s 0402 (x07) 0603 (x14) 0805 (x15) 1206 (x18) 1210 (x41) 1410 (x44) 1812 (x43) in mm in mm in mm in mm in mm in mm in mm x 0.020 0.51 0.035 0.89 0.050 1.27 0.065 1.65 0.100 2.54 0.100 2.54 0.125 3.18 y 0.020 0.51 0.025 0.64 0.035 0.89 0.040 1.02 0.040 1.02 0.040 1.02 0.040 1.02 g 0.024 0.61 0.040 1.02 0.050 1.27 0.080 2.03 0.080 2.03 0.100 2.54 0.130 3.30 v 0.015 0.38 0.020 0.51 0.022 0.56 0.040 1.02 0.045 1.14 0.045 1.14 0.045 1.14 u 0.039 0.99 0.060 1.52 0.080 2.03 0.120 3.05 0.160 4.06 0.160 4.06 0.190 4.83 z 0.064 1.63 0.090 2.29 0.120 3.05 0.160 4.06 0.160 4.06 0.180 4.57 0.210 5.33 use of solder mask beneath component is not recommended. v v v v v v z x u v g y z x u v g y x2y ? f i l t e r & d e c o u p l i n g c a p a c i t o r s o pti m izing x2y p e r f o r m a n c e w i t h p r o p e r a t t a c h m e n t t e c h n i q u e s x2y ? capacitors excel in low inductance performance for a myriad of applications including emi/rfi fltering, power supply bypass / decoupling. how the capacitor is attached to the application pcb is every bit as important as the capacitor itself. proper attention to pad layout and via placement insures superior device performance. poor pcb layouts squander performance, requiring more capacitors, and more vias to do the same job. figure 1 compares the x2y ? recommended layout against a poor layout. because of its long extents from device terminals to vias, and the wide via separation, the poor layout shown performs badly. it exhibits approximately 200% l1 inductance, and 150% l2 inductance compared to recommended x2y layouts. for further details on via placement and its effect on mounted inductance, please refer to x2y attenuators, llc. application note get the most from x2y capacitors with proper attachment techniques at www.x2y.com/bypass.htm good layout poor layout figure 1 *ohansonielectrics)ncreservestherighttomaedesignandpricechangeswithoutnoticellsalesaresubjecttotheterms andconditionsprintedonthebacsideofoursalesorderacnowledgmentformsincludingalimitedwarrantyandremediesfor nonconforminggoodsordefectivegoods7ewillbepleasedtoprovideacopyofthesetermsandconditionsforyourrevie w 15191 bledsoe street sylmar, california 91342 tel (818) 364-9800 ? f ax (818) 364-6100 http://www.johansondielectrics.com ? 2008 publication x2y0804 printed in usa johanson hong kong l td. unit e, 11/f., phase 1, kaiser estate 41 man yue street hunghom, kowloon, hong kong tel: (852) 2334 6310 ? fax: (852) 2334 8858 johanson europe ltd. acorn house, old kiln road flackwell heath, bucks hp10 9nr united kingdom tel +44-162-853-1154 ? fax +44-162-853-2703 x2y ? technology patents and registered trademark under license from x2y attenuators, llc
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