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2 accu-guard ? smd thin-film fuse accu-guard ? technology the accu-guard ? series of fuses is based on thin-film tech - niques. this technology provides a level of control on the com - po nent electrical and physical characteristics that is generally not pos si ble with standard fuse technologies. this has allowed avx to offer a series of devices which are designed for mod- ern surface mount circuit boards which require protection. features ? accurate current rating ? fast acting ? small-standard 0402, 0603, 0805, 1206 and 0612 chip sizes ? taped and reeled ? completely compatible with all soldering systems used for smt ? lead free series (f0402e, f02402g, f0603e, f0805b, f1206b) applications ? cellular telephones ? two-way radios ? computers ? battery chargers ? rechargeable battery packs ? hard disk drives ? pdas ? lcd screens ? scsi interface ? digital cameras ? video cameras approval file numbers ? ul, cul: rcd#e143842 ? ul (f0402g): rcd#e141069 how to order dimensions millimeters (inches) l t b 1 w b 2 f0402g f0402e f0603e f0603c f0805b f1206a/b f0612d l 1.000.05 1.000.10 1.600.10 1.650.25 2.10.2 3.10.2 1.650.25 (0.0390.002) (0.0390.004) (0.0630.004) (0.0650.010) (0.0830.008) (0.1220.008) (0.0650.010) w 0.580.04 0.550.07 0.810.10 0.800.15 1.270.1 1.60.1 3.10.2 (0.0230.002) (0.0220.003) (0.0320.004) (0.0310.006) (0.0500.004) (0.0630.004) (0.1220.008) t 0.350.05 0.400.10 0.630.10 0.900.2 0.900.2 1.20.2 0.900.2 (0.0140.002) (0.0160.004) (0.0250.004) (0.0350.008) (0.0350.008) (0.0470.008) (0.0360.008) b 0.480.05 0.200.10 0.350.15 0.350.15 0.300.15 0.430.25 0.350.15 (0.0190.002) (0.0080.004) (0.0140.006) (0.0140.006) (0.0120.006) (0.0170.010) (0.0140.006) a 0.200.05 (0.0080.002) s, h 0.050.05 (0.0020.002) f0603c, f0805b, f1206a and f1206b b t l w f0402g l t s w a b h f0402e and f0603e f product fuse 1206 size see table for standard sizes a fuse version a=accu-guard? b=accu-guard? ii c=accu-guard? ii 0603 d=accu-guard? ii 0612 e=accu-guard? ii 0402, 0603 g=accu-guard? ii 0402 low current 0r20 rated current current expressed in amps. letter r denotes decimal point. e.g. 0.20a=0r20 1.75a=1r75 f fuse speed f=fast w termination s=nickel/lead-free solder coated (sn 100) w=nickel/solder coated (sn 63, pb 37) n=nickel/lead-free solder coated (sn100) tr packaging tr=tape and reel
24 accu-guard ? smd thin-film fuse electrical specifications operating tem per a ture: -55c to +125c current carrying capacity at -55c is 107% of rating; at +25c 100% of rating; at +85c 93% of rating; at +125c 90% of rating. rated voltage: 32v interrupting rating: 50a insulation resistance: >20m guaranteed (after fusing at rated voltage) test conditions requirement solderability components completely immersed in a terminations to be well tinned solder bath at 235 5c for 2 secs. no visible damage leach resistance completely immersed in a solder bath dissolution of termination at 260 5c for 60 secs. 25% of area r/r<10% storage 12 months minimum with components good solderability stored in as received packaging. shear components mounted to a substrate. no visible damage a force of 5n applied normal to the line joining the terminations and in a line parallel to the substrate. rapid change of components mounted to a substrate. no visible damage temperature 5 cycles -55c to +125c. r/r<10% vibration per mil-std-202f no visible damage method 201a and r/r<10% method 204d condition d. load life 25c, i rated, 20,000 hrs. no visible damage r/r<10% 1206 current resistance voltage drop fusing current pr e-arc part number rating @ 10% x i rated, 25c @ 1 x i rated, 25c (within 5 sec.) 25c i 2 t @ 50a a (max.) mv (max.) a a 2 - sec. f1206a0r20fwtr 0.200 0.95 350 0.40 0.00002* f1206a0r25fwtr 0.250 0.75 280 0.50 0.00004* f1206a0r37fwtr 0.375 0.40 220 0.75 0.00006 f1206a0r50fwtr 0.500 0.35 220 1.00 0.0002 f1206a0r75fwtr 0.750 0.25 220 1.50 0.003 f1206a1r00fwtr 1.000 0.18 220 2.00 0.005 f1206a1r25fwtr 1.250 0.15 220 2.50 0.009 F1206A1R50FWTR 1.500 0.11 220 3.00 0.02 f1206a1r75fwtr 1.750 0.10 210 3.50 0.035 f1206a2r00fwtr 2.000 0.065 160 4.00 0.04 * current is limited to less than 50a at 32v due to internal fuse resistance. environmental characteristics
accu-guard ? smd thin-film fuse 0.20a 0.25a 0.375a 0.50a 0.75a 1.00a 1.25a 1.50a 1.75a 2.00a 10 -1 1 10 0.1 1 10 current, amp pre-arc time, seconds 100 10 -2 10 -3 10 -4 10 -5 10 -6 fuse time - current characteristics for size 1206 (typical)
26 accu-guard ? smd thin-film fuse 10 -1 1 10 100 pre-arc i 2 t, a 2 sec current, amp 10 -2 10 -3 10 -4 10 -5 50 40 30 20 10 0 60 2.00a 1.75a 1.50a 1.25a 1.00a 0.75a 0.50a ? 0.25a 0. 3 75a 0.20a fuse pre-arc joule integrals vs. current for size 1206 (typical)
accu-guard ? smd thin-film fuse 10 -1 1 10 100 pre-arc i 2 t, a 2 sec pre-arc time, seconds 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 2.00a 1.75a 1.50a 1.25a 1.00a 0.75a 0.50a 0. 3 75a 0.25a 0.20a fuse pre-arc joule integrals vs. pre-arc time for size 1206 (typical)
28 accu-guard ? smd thin-film fuse quality & reliability accu-guard ? series of fuses is based on established thin-film technology and materials used in the semiconduc- tor in dus try. ? in-line process control: this program forms an integral part of the production cycle and acts as a feedback sys- tem to regulate and control production processes. the test procedures, which are integrated into the production process, were developed after long research and are based on the highly developed semiconductor industry test pro ce dures and equip ment. these mea sures help avx/kyocera to produce a consistent and high yield line of products. ? final quality inspection: finished parts are tested for standard electrical parameters and visual/mechanical char ac ter is tics. each production lot is 100% evaluated for electrical resistance. in addition, each production lot is eval u at ed on a sample basis for: ? insulation resistance (post fusing) ? blow time for 2 x rated current ? endurance test: 125c, rated current, 4 hours handling and soldering smd chips should be handled with care to avoid dam age or contamination from perspiration and skin oils. the use of plastic tipped tweezers or vacuum pick-ups is strongly recommended for individual components. bulk handling should ensure that abrasion and mechanical shock are minimized. for automatic equipment, taped and reeled product is the ideal medium for direct presentation to the placement machine. circuit board type all flexible types of circuit boards may be used (e.g. fr-4, g-10). for other circuit board materials, please consult factory. component pad design component pads must be designed to achieve good joints and minimize component movement during soldering. pad designs are given below for both wave and reflow soldering. the basis of these designs are: a. pad width equal to component width. it is per mis si ble to decrease this to as low as 85% of component width but it is not advisable to go be low this. b. pad overlap 0.5mm. c. pad extension 0.5mm for reflow. pad ex ten sion about 1.0mm for wave soldering. preheat & soldering the rate of preheat in production should not exceed 4c/second. it is recommended not to exceed 2c/ sec ond. temperature differential from preheat to soldering should not exceed 150c. for further specific application or process advice, please consult avx. hand soldering & rework hand soldering is permissible. preheat of the pcb to 100c is required. the most preferable technique is to use hot air soldering tools. where a soldering iron is used, a tem per a - ture controlled model not exceeding 30 watts should be used and set to not more than 260c. max i mum al lowed time at tem per a ture is 1 minute. cooling after soldering, the assembly should preferably be al lowed to cool naturally. in the event of assisted cool ing, similar con di tions to those rec om mend ed for pre heat ing should be used. reflow soldering dimensions: millimeters (inches) 0.8 (0.031) 2.3 (0.091) 0.6 (0.024) 0.85 (0.033) 0.85 (0.033) 3.0 (0.118) 1.25 (0.049) 1.0 (0.039) 1.0 (0.039) 1.0 (0.039) 1.0 (0.039) 1.0 (0.039) 2.0 (0.079) 4.0 (0.157) 1.6 (0.063) wave soldering dimensions: millimeters (inches) 3.1 (0.122) 0.8 (0.031) 0.6 (0.024) 1.25 (0.049) 1.25 (0.049) 1.5 (0.059) 1.5 (0.059) 1.0 (0.039) 4.0 (0.157) 1.25 (0.049) 1.5 (0.059) 1.5 (0.059) 2.0 (0.079) 5.0 (0.197) 1.6 (0.063) 1.25 (0.049) 0.6 (0.024) 1.25 (0.049) 3.1 (0.122) 3.1 (0.122) 0.85 (0.033) 0.6 (0.024) 0.85 (0.033) 2.3 (0.091) 3.1 (0.122) 1206 0612 0805 0603 0402 0402 1206 0612 0805 0603 0 . 8 ( 0.031 ) 0 . 8 ( 0.031 ) 0 . 5 ( 0.020 ) 2.1 ( 0.083 ) 0 . 59 ( 0.023 ) 0 . 6 ( 0.024 ) 0 . 6 ( 0.024 ) 0 . 5 ( 0.020 ) 1.7 ( 0.068 ) 0 . 59 (0.023)
accu-guard ? smd thin-film fuse recommended soldering profiles ir reflow cleaning recommendations care should be taken to ensure that the devices are thor- oughly cleaned of flux residues, especially the space beneath the device. such residues may oth er wise become conductive and effectively offer a lousy bypass to the device. various recommended cleaning conditions (which must be optimized for the flux system being used) are as follows: cleaning liquids . . . . . . . .i-propanol, ethanol, acetylace- tone, water, and other stan- dard pcb cleaning liquids. ultrasonic conditions . . . .power C 20w/liter max. fre- quency C 20khz to 45khz. temperature . . . . . . . . . .80c maximum (if not other- wise limited by chosen solvent system). time . . . . . . . . . . . . . . . .5 minutes max. storage conditions recommended storage conditions for accu-guard ? prior to use are as follows: temperature 15c to 35c humidity 65% air pressure 860mbar to 1060mbar vapor phase 220 210 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 00.511.522.533.544.5 assembly enters the preheat zone additional soak time to allow uniform heating of the substrate soak time 1) activates the flux 2) allows center of board temperatures to catch up with corners 45-60 sec. above solder melting point assembly exits heat no forced cooldown 186 c solder melting temperature component land temp (deg c) time (mins) 0 20 temperature c 40 60 80 100 120 140 160 180 200 215 c time (minutes) preheat transfer from preheat with min. delay & temp. loss 0 20 40 60 80 100 120 140 160 180 215 c time (seconds) reflow enter vapor natural cooling duration varies with thermal mass of assembly 10?0 secs typical 10 20 30 40 50 60 70 200 0 2030405060708090100110120 260 240 220 200 180 160 140 120 100 80 60 40 20 time (seconds) enter wave natural cooling 100 c 3? seconds 10 temperature c wave soldering
30 accu-guard ? smd thin-film fuse note: avx reserves the right to change the information published herein without notice. packaging automatic insertion packaging tape & reel: all tape and reel specifications are in compliance with eia 481-1 8mm carrier reeled quantities: reels of 3,000 or 10,000 pieces (for f0402: 5,000 or 20,000 pieces) a(1) b* c d* e f g 180 + 1.0 1.5 min. 13 0.2 20.2 min. 50 min. 9.4 1.5 14.4 max. (7.087 + 0.039) (0.059 min.) (0.512 0.008) (0.795 min.) (1.969 min.) (0.370 0.050) (0.567 max.) metric dimensions will govern. inch measurements rounded for reference only. (1) 330mm (13 inch) reels are available. reel dimensions: millimeters (inches) abcde f 8.0 0.3 3.5 0.05 1.75 0.1 2.0 0.05 4.0 0.1 1.5 (0.315 0.012) (0.138 0.002) (0.069 0.004) (0.079 0.002) (0.157 0.004) (0.059 ) note: the nominal dimensions of the component compartment (w,l) are derived from the component size. carrier dimensions: millimeters (inches) full radius d * b * c e f g max. a drive spokes optional if used, asterisked dimensions apply. * a e p d f w l c b 10 pitches cumulative tolerance on tape 0.2 center lines of cavity top tape direction of feed p = 4mm except 0402 where p = 2mm +0.1 -0.0 +0.004 -0.000
accu-guard ? smd thin-film fuse correct choice of an accu-guard ? fuse for a given applica- tion is fairly straightforward. the factor of pre-arc i 2 t, howev- er, requires clarification. the proper design for pre-arc i 2 t is presented by way of example. design parameters 1. operating temperature the accu-guard ? is specified for operation in the tempera- ture range of -55c to +125c. note, how ev er, that fusing current is sensitive to temperature. this means that the fuse must be derated or uprated at circuit temperatures other than 25c: 2. circuit voltage maximum voltage: accu-guard ? is specified for circuits of up to rated voltage. accu-guard ? will suc cess ful ly break currents at higher voltages as well, but over voltage may crack the fuse body. minimum voltage: accu-guard ? cannot be used in circuits with voltage of about 0.5v and less. the internal resistance of the fuse will limit the fault current to a value which will pre- vent reliable actuation of the fuse (<2 x rated current). 3. maximum fault current accu-guard ? is fully tested and specified for fault currents up to 50a. accu-guard ? will successfully break currents above 50a, but such over current may crack the fuse body or damage the fuse ter mi na tions. 4. steady-state current the accu-guard ? current rating is based on iec spec i fi ca - tion 127-3. in accordance with this in ter na tion al standard, accu-guard ? is specified to operate at least 4 hours at rated current without fusing (25c). engineering tests have shown that f0805b and f1206a/b accu-guard ? will in fact operate at least 20,000 hours at rated current without fusing (25c). 5. switch-on and other pulse current many circuits generate a large current pulse when initially connected to power. there are also circuits which are sub- ject to momentary current pulses due to external sources; telephone line cards which are subject to lightning-induced pulses are one example. these current pulses must be passed by the fuse without causing actuation. these puls- es may be so large that they are the determining factor for choosing the accu-guard ? current rating; not necessarily steady state cur rent. in order to design for current pulses, the concept of fuse pre-arc joule integral, i 2 t, must be understood. fuse current rating is defined by the requirement that 2 x i r will cause actuation in <5 seconds. this rating does not indicate how the fuse will react to very high currents of very short duration. rather, the fusing characteristic at very high currents is specified by i 2 t-t curves (or i 2 t-i). i 2 t expresses the amount of energy required to actuate the fuse. total i 2 t expresses the total energy which will be passed by the fuse until total cessation of current flow. pre-arc i 2 t expresses that energy required to cause large irreversible damage to the fuse element (total i 2 t = pre-arc i 2 t + arc i 2 t). if the joule integral of the switch-on pulse is larger than the fuse pre-arc i 2 t, nuisance actuation will occur. in order to choose the proper accu-guard ? current rating for a given application, it is necessary to calculate the i 2 t joule integral of the circuit switch-on and other current pulses and compare them to the accu-guard ? i 2 t-t curves. an accu- guard ? fuse must be chosen such that the pulse i 2 t is no more than 50% of the pre-arc i 2 t of the prospective fuse. pre-arc i 2 t of the accu-guard ? fuses is well char ac ter ized; i 2 t-t and i 2 t-i graphs are in this catalog. the prob lem is cal- culating the i 2 t of the circuit current pulses. this concept is not familiar to most engineers. correct calculation of pulse joule integral and sub se quent choice of accu-guard ? current rating is il lus trat ed by way of the attached examples. how to choose the correct accu-guard ? fuse for circuit protection environmental accu-guard ? temperature current carrying capacity* f0402e, f0805b, f1206a, f0805b 2.50a f0603c f0612d f0603e f1206b & 3.00a -55c to -11c 1.07 x i r 1.07 x i r 1.07 x i r 1.07 x i r 1.07 x i r -10c to 60c i r i r i r i r i r 61c to 100c 0.85 x i r 0.93 x i r 0.90 x i r 0.90 x i r 0.80 x i r 101c to 125c 0.80 x i r 0.90 x i r 0.90 x i r 0.75 x i r 0.75 x i r *as a function of nominal rated current, i r .
32 fig. 2c. choice of 0.75a fuse, example #2. pre-arcing i 2 t maximum i 2 t design rule i 2 t for sample switch-on pulse accu-guard ? smd thin-film fuse t l max. fig. 1a. sine wave pulse parameters for joule integral calculation, example #1. thus, for the current pulse in figure 1b, the joule integral is [(4.8a) 2 x 7.7 x 10 -6 sec]/2 = 8.9 x 10 -5 a 2 sec. the pulse duration is 7.7sec. we must find a fuse that can absorb at least 8.9 x 10 -5 x 2 = 1.8 x 10 -4 a 2 sec joule inte- gral within 7.7 sec without actuation. ac cord ing to the i 2 t graph on page 6, pre-arcing joule integral is 2.3x10 -4 a 2 sec for the 0.5a fuse, which is slightly more than needed. the next lower rating (0.375a), has only 6x10 -5 a 2 sec, which is not enough. therefore, 0.5a fuse should be chosen for this application, see figure 1c. fuse pre-arcing joule integrals vs. pre-arcing time 2. triangular current pulse the joule integral for triangular pulse is [(imax.) 2 x t]/3, see fig. 2a. fig. 2a. triangular pulse parameters for joule integral calculation, example #2. t l max. thus, for the current pulse in figure 2b, the joule integral is [(1.5a) 2 x 3 x 10 -3 sec]/3 = 2.25 x 10 -3 a 2 sec. fig. 1b. sine wave pulse, example #1. fig. 2b. triangular pulse, example #2. the pulse duration is 3 msec. in the i 2 t graph on page 6, pre- arcing joule integral for 3 msec pulse is 4 x 10 -3 a 2 sec for the 0.5a fuse (not enough) and 2 x 10 -2 for the 0.75a fuse (more than enough). therefore, 0.75a fuse should be chosen for this application, see figure 2c. fuse pre-arcing joule integrals vs. pre-arcing time 0.75a pre-arcing time l 2 t, a 2 sec pre-arcing time, sec 100 10 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 x x 10 sec/div 1a/div 2 msec/div 0.5a/div 0.5a pre-arcing time l 2 t, a 2 sec pre-arcing time, sec 100 10 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 x x fig. 1c. choice of 0.5a fuse, example #1. pre-arcing i 2 t maximum i 2 t design rule i 2 t for sample current pulse designing for current pulse situations 1. sine wave current pulse the joule integral for sine wave pulse is [(i max. ) 2 x t]/2, see fig. 1a.
accu-guard ? smd thin-film fuse thus, for current pulse in figure 3b, the joule integral is: {(0.56a) 2 +0.56a x (1a-0.56a)+ [ (1a-0.56a) 2 ] } x 3 x 10 -3 s = 1.9 x 10 -3 a2sec. fig. 3a. trapezoidal pulse parameters for joule integral calculation, example #3. 4. lightning strike a lightning strike pulse is shown in figure 4a. after an initial linear rise, the current declines exponentially. 3. trapezoidal current pulse the joule integral for a trapezoidal pulse is [ (i min. ) 2 + i min. x (i max. - i min. ) + ( i max - i min ) 2 ] x t, 3 see fig. 3a. t l min. l max. 0.5 msec/div 0.5a/div fig. 3b. trapezoidal pulse, example #3. according to the i 2 t graph on page 6, the 0.5a fuse should be chosen for this application, see figure 3c. fuse pre-arcing joule integrals vs. pre-arcing time 0.50a pre-arcing time l 2 t, a 2 sec pre-arcing time, sec 100 10 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 x fig. 3c. choice of 0.5a fuse, example #3. pre-arcing i 2 t maximum i 2 t design rule i 2 t for sample switch-on pulse x x designing for current pulse situations (cont.) joule integral for the linear current rise is calculated as for a triangular pulse, see example #2. the joule integral for the exponential decline is i max. 2 x t 0.5 x (-1/2in 0.5) = 0.72i max. 2 x t 0.5 thus, for the sample lightning strike pulse in figure 4b, the total joule integral is: (25a) 2 x 2 x 10 -6 sec/3+0.72 x (25a) 2 x 10 x 10 -6 sec = 4.92 x 10 -3 a 2 sec. t 0.5 0.51 max. l max. fig. 4a. lightning pulse parameters for joule integral cal cu la tion, example #4. 10 sec/div 5a/div fig. 4b. lightning strike pulse, example #4. for practical calculations, the duration of ex po nen tial decline may be assumed to be 3t 0.5 , because within this time 98.5% of the pulse energy is released. thus, the total pulse duration in this example is 30 sec, and the 1.25a fuse should be chosen for this application, see figure 4c. fuse pre-arcing joule integrals vs. pre-arcing time fig. 4c. choice of 0.5a fuse, example #4. pre-arcing i 2 t maximum i 2 t design rule i 2 t for sample switch-on pulse 1.25a pre-arcing time l 2 t, a 2 sec pre-arcing time, sec 100 10 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 x 3
fig. 6b. choice of 0.75a fuse, example #6. pre-arcing i 2 t maximum i 2 t design rule i 2 t for sample switch-on pulse fig. 5b. choice of fuse, example #5. pre-arcing i 2 t maximum i 2 t design rule i 2 t for sample switch-on pulse accu-guard ? smd thin-film fuse 6. switch-on pulse and steady-state current in figure 6a, the switch-on pulse is a triangle pulse with a 5.1 x 10 -3 a 2 sec joule integral of 5 msec duration; the 0.75a fuse will meet this requirement, see figure 6b. 5. complex current pulse if the pulse consists of several waveforms, all of them should be evaluated sep a rate ly, and then the total joule integral should be calculated as well. 2 msec/div 0.5a/div fig. 6a. switch-on pulse and steady-state current, example #6. 200 sec/div 2a/div fig. 5a. complex pulse, example #5. 0.75a pre-arcing time l 2 t, a 2 sec pre-arcing time, sec 100 10 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 x x x fuse pre-arcing joule integrals vs. pre-arcing time the joule integral for the second triangle is [(5.33a) 2 x 269 x 10 -6 sec]/3 = 2.55 x 10 -3 a 2 sec, and 0.75a fuse is suitable for this case also, see figure 5b. however, for the whole pulse, the joule integral is 4.7 x 10 -3 a 2 sec, and the total duration is 563 sec. for the 0.75a fuse, the joule integral is only 8.6 x 10 -3 a 2 sec for this pulse duration, so the 1a fuse should be chosen for this application, see figure 5b. in figure 5a, the joule integral for the first triangle is [(4.67a) 2 x 294 x 10 -6 sec]/3=2.14 x 10 -3 a2sec and 0.75a fuse should meet this condition, see figure 5b. fuse pre-arcing joule integrals vs. pre-arcing time 0.75a pre-arcing time l 2 t, a 2 sec pre-arcing time, sec 100 10 1 10 -1 10 -2 10 -3 10 -4 10 -5 10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 110 x x the steady-state current is 0.5a, and 1a fuse is typically rec- ommended to meet the steady-state con di tion. based on steady-state current, the 1a fuse should be chosen for this application. designing for current pulse situations (cont.) 34

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