46 general description with increased requirements from the automotive industry for additional component robustness, avx recognized the need to produce a mlcc with enhanced mechanical strength. it was noted that many components may be subject to severe flexing and vibration when used in various under the hood automotive and other harsh environment applications. to satisfy the requirement for enhanced mechanical strength, avx had to find a way of ensuring electrical integrity is maintained whilst external forces are being applied to the component. it was found that the structure of the termination needed to be flexible and after much research and development, avx launched flexiterm ? . flexiterm ? is designed to enhance the mechanical flexure and temperature cycling performance of a standard ceramic capacitor with an x7r dielectric. the industry standard for flexure is 2mm minimum. using flexiterm ? , avx provides up to 5mm of flexure without internal cracks. beyond 5mm, the capacitor will generally fail open. as well as for automotive applications flexiterm ? will provide design engineers with a satisfactory solution when designing pcbs which may be subject to high levels of board flexure. mlcc with flexiterm ? general specifications applications high flexure stress circuit boards ? e.g. depanelization: components near edges of board. variable temperature applications ? soft termination offers improved reliability per- formance in applications where there is tem- perature variation. ? e.g. all kind of engine sensors: direct connection to battery rail. automotive applications ? improved reliability. ? excellent mechanical performance and thermo mechanical performance. product advantages ? high mechanical performance able to withstand, 5mm bend test guaranteed. ? increased temperature cycling performance, 3000 cycles and beyond. ? flexible termination system. ? reduction in circuit board flex failures. ? base metal electrode system. ? automotive or commercial grade products available. how to order 0805 style 0603 0805 1206 1210 1812 2220 5 voltage 6 = 6.3v z = 10v y = 16v 3 = 25v 5 = 50v 1 = 100v 2 = 200v 2 packaging 2 = 7" reel 4 = 13" reel c dielectric c = x7r f = x8r 104 capacitance code (in pf) 2 sig digits + number of zeros e.g., 104 = 100nf k capacitance tolerance j = 5%* k = 10% m = 20% *1f only a special code a = std. product z terminations z = flexiterm ? for flexiterm ? with tin/lead termination see avx ld series a failure rate a=commercial 4 = automotive note: contact factory for availability of tolerance options for specific part numbers.
47 mlcc with flexiterm ? specifications and test methods performance testing board bend test procedure according to aec-q200 bend testplate control panel connector digital caliper mounting assembly loading knife control panel board bend test results aec-q200 vrs avx flexiterm ? bend test 12 0603 10 8 6 4 2 0 npo x7r x7r soft term 12 1206 substrate bend (mm) substrate bend (mm) substrate bend (mm) substrate bend (mm) 10 8 6 4 2 0 npo x7r x7r soft term 12 0805 10 8 6 4 2 0 npo x7r x7r soft term 12 1210 10 8 6 4 2 0 npo x7r x7r soft term temperature cycle test procedure 1 hour 12mins +125 0 c +25 0 c -55 0 c avx enhanced soft termination bend test procedure bend test the capacitor is soldered to the printed circuit board as shown and is bent up to 10mm at 1mm per second: typical bend test results are shown below: style conventional termination flexiterm ? 0603 >2mm >5mm 0805 >2mm >5mm 1206 >2mm >5mm aec-q200 qualification: ? created by the automotive electronics council ? specification defining stress test qualification for passive components testing: key tests used to compare soft termination to aec-q200 qualification: ? bend test ? temperature cycle test test procedure as per aec-q200: the test is conducted to determine the resistance of the component when it is exposed to extremes of alternating high and low temperatures. ? sample lot size quantity 77 pieces ? tc chamber cycle from -55oc to +125oc for 1000 cycles ? interim electrical measurements at 250, 500, 1000 cycles ? measure parameter capacitance dissipation factor, insulation resistance test procedure as per aec-q200: sample size: 20 components span: 90mm minimum deflection spec: 2 mm ? components soldered onto fr4 pcb (figure 1) ? board connected electrically to the test equipment (figure 2) fig 1 - pcb layout with electrical connections fig 2 - board bend test equipment test temperature profile (1 cycle) table summary ? the board is placed on 2 supports 90mm apart (capacitor side down) ? the row of capacitors is aligned with the load stressing knife ? the load is applied and the deflection where the part starts to crack is recorded (note: equipment detects the start of the crack using a highly sensitive current detection circuit) ? the maximum deflection capability is 10mm max. = 10mm max. = 10mm 90mm
48 % failure 10 8 6 4 2 0 0 500 1000 1500 0603 2000 2500 3000 % failure 10 8 6 4 2 0 0 500 1000 1500 1206 2000 2500 3000 % failure 10 8 6 4 2 0 0 500 1000 1500 0805 2000 2500 3000 % failure 10 8 6 4 2 0 0 500 1000 1500 1210 2000 soft term - no defects up to 3000 cycles 2500 3000 beyond 1000 cycles: temperature cycle test results aec-q200 specification states 1000 cycles compared to avx 3000 temperature cycles. mlcc with flexiterm ? specifications and test methods flexiterm? test summary without soft termination with soft termination major fear is of latent board flex failures. far superior mechanical performance. generally open failure mode beyond 5mm flexure. ? qualified to aec-q200 test/specification with the exception of using avx 3000 temperature cycles (up to +150c bend test guaranteed greater than 5mm). ? flexiterm ? provides improved performance compared to standard termination systems. ? board bend test improvement by a factor of 2 to 4 times. ? temperature cycling: C 0% failure up to 3000 cycles C no esr change up to 3000 cycles
49 mlcc with flexiterm ? x8r dielectric capacitance range letter acegjkmnpqxyz max. 0.33 0.56 0.71 0.90 0.94 1.02 1.27 1.40 1.52 1.78 2.29 2.54 2.79 thickness (0.013) (0.022) (0.028) (0.035) (0.037) (0.040) (0.050) (0.055) (0.060) (0.070) (0.090) (0.100) (0.110) paper embossed size 0603 0805 1206 wvdc 25v 50v 25v 50v 25v 50v 271 cap 270 g g 331 (pf) 330 g g j j 471 470 g g j j 681 680 g g j j 102 1000 g g j j j j 152 1500 g g j j j j 182 1800 g g j j j j 222 2200 g g j j j j 272 2700 g g j j j j 332 3300 g g j j j j 392 3900 g g j j j j 472 4700 g g j j j j 562 5600 g g j j j j 682 6800 g g j j j j 822 8200 g g j j j j 103 cap 0.01 g g j j j j 123 (f) 0.012 g g j j j j 153 0.015 g g j j j j 183 0.018 g g j j j j 223 0.022 g g j j j j 273 0.027 g g j j j j 333 0.033 g g j j j j 393 0.039 g g j j j j 473 0.047 g g j j j j 563 0.056 g n n m m 683 0.068 g n n m m 823 0.082 n n m m 104 0.1 n n m m 124 0.12 n n m m 154 0.15 n n m m 184 0.18 n m m 224 0.22 n m m 274 0.27 mm 334 0.33 mm 394 0.39 m 474 0.47 m 684 0.68 824 0.82 105 1 wvdc 25v 50v 25v 50v 25v 50v size 0603 0805 1206 = aec-q200 qualified
50 mlcc with flexiterm ? x7r dielectric capacitance range 0603 0805 1206 1210 1812 2220 16v 25v 50v 100v 200v 10v 16v 25v 50v 100v 200v 16v 25v 50v 100v 200v 16v 25v 50v 100v 16v 25v 50v 100v 25v 50v 100v 101 121 151 181 221 271 j j j j j j 331 j j j j j j j j j j j 391 j j j j j j j j j j j 471 j j j j j j j j j j j 561 j j j j j j j j j j j 681 j j j j j j j j j j j 821 j j j j j j j j j j j 102 j j j j j j j j j j j j j j j j 122jjjj jjjjjjjjjjj 152jjjj jjjjjjjjjjj 182jjjj jjjjjjjjjjj 222jjjj jjjjjjjjjjj 272jjjj jjjjjjjjjjj 332jjjj jjjjjjjjjjj 392jjjj jjjjjjjjjjj 472jjjj jjjjjjjjjjj 562jjjj jjjjjjjjjjj 682jjjj jjjjjjjjjjj 822jjjj jjjjjjjjjjj 103jjjj jjjjjjjjjjj 123 j j j j j j j m j j j j j 153 j j j j j j j m j j j j j 183 j j j j j j j m j j j j j 223 j j j j j j j m j j j j j k 273 j j j j j j j m j j j j j k 333 j j j j j j j m j j j j j k 393 j j j j j j j m j j j m j k 473 j j j j j j j m j j j m j k 563 j j j j j j j n j j j m j k k k m k k k k 683 j j j j j j j n j j j m j k k k m k k k k 823 j j j j j j j n j j j p j k k k m k k k k 104 j j j j j j j n j j j q j k k k p k k k k x x x 124 j j j n n j j p q k k k q k k k k 154 m m n n n j j p q k k k q k k k m x x x 184 m m n n n j m p q m m m q k k k m 224 m m n n n j m p q m m m q m m m x x x x 274 n n n n n j m p q p p p q m m m x 334 n n n n n j m p q p p p q m m m x x x x 394 n n n n n m m p q p p p q x x x x 474 n n n n n m m p q p p p q x x x x x x x 564 n n n m q q q p q q q x x x z 684 n n n m q q q p x x x x x x z x x x 824 n n n m q q q p z z z x x x z 105 n n n m q q q p z z z x x x z x x x 155 qq pzz z zzx xx 185 qq zzzz zz 225 qq zzzz zzx xx 335 zzz z z 475 zzz z z 106 zz 226 z 16v 25v 50v 100v 200v 10v 16v 25v 50v 100v 200v 16v 25v 50v 100v 200v 16v 25v 50v 100v 16v 25v 50v 100v 25v 50v 100v 0603 0805 1206 1210 1812 2220 letter acegjkmnpqxyz max. 0.33 0.56 0.71 0.90 0.94 1.02 1.27 1.40 1.52 1.78 2.29 2.54 2.79 thickness (0.013) (0.022) (0.028) (0.035) (0.037) (0.040) (0.050) (0.055) (0.060) (0.070) (0.090) (0.100) (0.110) paper embossed
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