40 080216 communication bus varistor the can bus and flexray varistor is a zinc oxide (zno) based ceramic semiconductor device with non- linear voltage-current characteristics (bi-directional) similar to back-to-back zener diodes and an emc capacitor in parallel (see equivalent circuit model). they have the added advantage of greater current and energy handling capabilities as well as emi/rfi attenuation. devices are fabricated by a ceramic sintering process that yields a structure of conductive zno grains surrounded by electrically insulating barriers, creating varistor like behavior. avx communication bus varistors offer the advantages of large in-rush current capability, low capacitance to minimize signal distortion, fast turn on time to conservatively clamp the energy before its maximum and off state emi filtering through their bulk capacitance. these features coupled with an extremely low fit rate and excellent process capability make an ideal device for today's automotive or general circuit protection. how to order can style can = can bus flx = flexray 0001 case size 0001 = 0603 discrete 0002 = 0405 2-element 0003 = 0405 2-element 0004 = 0612 4-element 0005 = 0402 discrete 0006 = 0402 discrete 0007 = 0603 discrete p termination p = ni/sn (plated) d packaging code (reel size) d = 7" reel (1,000 pcs.) r = 7" reel (4,000 pcs.) t = 13" reel (10,000 pcs.) w = 7" reel (10,000 pcs.) 0402 only general description performance characteristics avx pn v w (dc) v w (ac) v b v c i vc i l e t i p cap freq v jump p diss max case elements can0001 _ _ 18 14 120 225 1 2 0.015 4 22 max m 27.5 0.003 0603 1 can0002 _ _ 18 14 70 145 1 2 0.015 4 22 max m 27.5 0.003 0405 2 can0003 _ _ 18 14 28.5 50 1 5 0.02 15 50 max m 27.5 0.0008 0405 2 can0004 _ _ 18 14 100 180 1 2 0.015 4 22 max m 27.5 0.003 0612 4 can0005 _ _ 18 14 33 55 1 2 0.05 10 37 max m 27.5 0.01 0402 1 can0006 _ _ 18 14 26 45 1 5 0.02 4 17 max m 27.5 0.004 0402 1 can0007 _ _ 32.0 25.0 61 120 1 5 0.05 5 15 max m 27.5 0.003 0603 1 flx0005 _ _ 18 14 26 45 1 5 0.02 4 17 max m 27.5 0.004 0402 1 termination finish code packaging code v w (dc) dc working voltage (v) v w (ac) ac working voltage (v) v b typical breakdown voltage (v @ 1ma dc ) v c clamping voltage (v @ i vc ) i vc test current for v c (a, 8x20s) i l maximum leakage current at the working voltage (a) e t transient energy rating (j, 10x1000s) i p peak current rating (a, 8x20s) cap maximum capacitance (pf) @ 1 mhz and 0.5vrms temp range -55oc to +125oc general characteristics ? operting teperature: -55c to +125c ? working voltage: 18vdc ? case size: 0402, 0603 0405 2xarray 0612 4xarray features ? compact footprint ? high esd capability (25kv) ? high inrush current (8x20s) ? emi/rfi attenuation ? low capacitance/low insertion loss ? very fast response time ? high reliability <0.1 fit ? aec-q200 qualified applications ? communication bus: can bus, flexray, etc. ? general i/o protocols ? keyboard interfaces ? datalines ? sensors ? capacitance sensitive applications and more
41 080216 communication bus varistor equivalent circuit model discrete mlv model s21 characteristics pcb trace to device requiring protection r v c r p r on l p solder pad where: r v = voltage variable resistance (per vi curve) r p 10 12 c = defined by voltage rating and energy level r on = turn on resistance l p = parallel body inductance 0 1 10 100 1000 10000 frequency (mhz) 10.0 0.0 -10.0 -20.0 -30.0 -40.0 -50.0 insertion loss (db) can0001 can0005 flx0005 5 0 -5 -10 -15 -20 -25 -30 insertion loss (db) frequency (mhz) 0.1 1 10 100 1000 10000 can0007 10000 1000 100 10 10 100 1000 10000 pulse duration ( s) peak power (w) typical pulse rating curve diode protection method three component solution tvs + emi xcvr tvs diodes multilayer varistors (mlvs) bus emc cap mlv protection method single component solution tvs & emi xcvr bus typical mlv implementation typical pulse rating curve
42 080216 communication bus varistor solder pad dimensions mm (inches) typical can bus implementation scheme typical flex ray implementation scheme 0402 discrete 0603 discrete 0405 array 0612 array length 1.00 0.10 (0.040 0.004) 1.60 0.15 (0.063 0.006) 1.00 0.15 (0.039 0.006) 1.60 0.20 (0.063 0.008) width 0.50 0.10 (0.020 0.004) 0.80 0.15 (0.032 0.006) 1.37 0.15 (0.054 0.006) 3.20 0.20 (0.126 0.008) thickness 0.60 max. (0.024 max.) 0.90 max. (0.035 max.) 0.66 max. (0.026 max.) 1.22 max. (0.048 max.) term band width 0.25 0.15 (0.010 0.006) 0.35 0.15 (0.014 0.006) 0.36 0.10 (0.014 0.004) 0.41 0.10 (0.016 0.010) a b c d e c a b a b 0405 array 0402/0603 discrete 0612 array a b c d e abcde 0402 discrete 0.61 0.51 1.70 CC (0.024) (0.020) (0.067) 0603 discrete 0.89 0.76 2.54 CC (0.035) (0.030) (0.100) 0405 array 0.46 0.74 0.12 0.38 0.64 (0.018) (0.029) (0047) (0.015) (0.025) 0612 array 0.89 1.65 2.54 0.46 0.76 (0.035) (0.065) (0.100) (0.018) (0.030) physical dimensions mm (inches) 0402, 0603 0405 0612 discrete array array ecu bp bm v2 v1 v cc tx d vcc v2 v1 transceiver v cc txd rxd can_h can_l split
43 080216 communication bus varistor flexray tm can powertrain body control module/can gateway instrument cluster smart junction box dash board node hvac door module wheel node wheel node wheel node wheel node x-by-wire master = can0001 = feedthru cap = multiguard = tantalum leds lamps tachometer (stepper motor) speedometer (stepper motor) ntc based temp. sensor fll l lamp/ led drvr 8v reg 5v reg physical interface ddc batt gauge motor drvr lcd module mcu can bus application avx can bus and flexray varistors offer significant advantages in general areas of a typical can or flexray network as shown on the right. some of the advantages over diodes include: ? space savings ? higher esd capability @ 25kv contact ? higher in rush current (4a) 8 x 20s ? fit rate 0.1 failures (per billion hours)
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