type jad micro fuse is designed for circuit protection against excessive current in portable electronic equipment, electronic circuit around battery etc. because the demand for high capacity batteries is increasing. since it is designed as chip typ e, it is compact and the best suitable for portable use. also, the ecology design of type jad is gentle because of complete lead - free. 1. a micro fuse in conformity to ul 2. low fusing point element that is newly developed is applied. has excellent fusi ng and cutting characteristics. 3. surface temperature rise is 100c or less when applying twice rated current for fusing. this offers less influence on the peripheral units. 4. small size of 3216 (3.2 1.6 1.6 mm), using resin mold and precision case 5 . suitable for automatic mounting 6. precise dimensions allows high - density mounting and symmetrical construction of terminals provide self - alignment. 7. resistance to soldering heat : reflow or flow soldering 10 seconds at 260c 8. standard package : 8 mm width tape carrier 9. lead free and rohs compliant features catalog numbers and rating february , 2011 rating ordering information type jad (p - jad - e002) jad 2 4 0 2 102 n a 010 item category temperature range rated current rated voltage voltage drop insulation resistance (between terminals and case) type code rv code rated current code rated current code package type special product code current 501 0.5 a 202 2.0 a na 3 ` ` jad 2402 501 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1
construction standard test body dimensions marking recommended pad dimensions glass epoxy body on one side board thickne ss : 1.6 mm copper layer : 3 m 100mm 33mm 1.5mm 5mm number name material etc. 3 . 2 0 . 2 . code rated current 0.5 0.50a 0.8 0.80a 1.0 1.00a 1.25 1.25a 1.6 1.60a 2.0 2.00a 2.5 2.50a 3.15 3.15a 4.0 4.00a 2
no. item performance test method 1 temperature rise t emperature rise shall not exceed 70 c . apply rated current. (ambient temperature : 10 ~ 30c) 2 current - carrying capacity shall not open within 1 hour. apply 100% of rated current at 70c. 3 voltage drop voltage drop is below the value specified in catal og numbers and rating. apply rated current using 24 v power supply. 4 fusing characteristics fusing within 1 min . apply 2 0 0% of rated current. 5 insulation resistance 1000 m or more insulation resistance between terminals and case 6 electrode strengt h (bending ) no mechanical damage. shall meet the fusing characteristics. variation of internal resistance should be less than 10%. board supporting width : 90 mm bending speed : approx. 0.5 mm/s ec. duration : 30 s ec. bending : 3 mm 7 shear test no mecha nical damage. shall meet the fusing characteristics. variation of internal resistance should be less than 10%. applied force : 20 n (2.04 kgf) duration : 10 sec 8 substrate bending test no mechanical damage. shall meet the fusing characteristics. variat ion of internal resistance should be less than 10%. supporting dimension : 1.2 mm applied force : 10 n (1.02 kgf) 9 solderability (solder wetting time) solder wetting time : within 3 sec. solder : sn C 3ag C 0.5cu temperature : 245 3 c meniscograph method solder : jisz3282 h60a, h60s, h63a temperature : 230 2 c meniscograph method 10 solderability (new uniform coating of solder) the dipping surface of the terminals shall be covered more than 95% with new solder. solder : sn C 3ag C 0.5cu temperature : 24 5 3 c dipping : 3 s ec. solder : jisz3282 h60a, h60s, h63a temperature : 230 2 c dipping : 3 s ec. 1 1 resistance to soldering heat marking shall be legible. no mechanical damage. shall meet the electric performance. dipping preconditioning : 100 ~ 150 c , 60 s ec. temperature : 26 0 5 c , 10 1 s ec. reflow soldering preconditioning : 1 ~ 2 min, 180 c or less peak : 250 5 c , 5 sec. holding : 230 ~ 250 c , 20 ~ 40 sec. cooling : more than 2 min. manual soldering iron edge temperature : higher than 350 c duration : 3 ~ 4 sec . 12 solvent resistance marking shall be legible. no mechanical damage. shall meet the fusing characteristics. variation of internal resistance should be less than 10%. dipping rinse solvent : isopropyl alcohol duration : 90 sec 13 vibration no mechanical damage. variation of internal resistance should be less than 10%. frequency range : 10 ~ 50 ~ 10 hz/min v ibration amplitude : 1.5 mm duration : 2 hours in each of xyz directions (total : 6 hours) 14 shock no mechanical damage. variation of internal resistance should be less than 10%. peak value : 490 m/s 2 (50 g) duration : 11 ms 6 aspects 3 times (total : 18 times) 1 5 thermal shock no mechanical damage. variation of internal resistance should be less than 10%. C 55 3 c : 30 m in. room temperature : 2 ~ 3 m in or less 125 2 c : 30 m in. room temperature : 2 ~ 3 m in or less repeat above step for 10 cycl es 16 atomizing salt water no mechanical damage. variation of internal resistance should be less than 10%. temperature : 35 2c concentration (weight ratio) : 5 1% duration : 24 hours 1 7 moisture resistance no mechanical damage. variation of intern al resistance should be less than 10%. temperature : 85 3 c humidity : 85 3 % rh duration : 1000 h ours 18 moisture resistance load no mechanical damage. variation of internal resistance should be less than 10%. jad322 and 402 with sgu element sh all be within %. temperature : 85 3 c humidity : 85 3 % rh applied voltage : rated current 78 % duration : 1000 h ours 19 load life no mechanical damage. variation of internal resistance should be less than 10%. jad322 and 402 with sgu element shall be within %. temperature : 85 3 c applied current : rated current 78 % duration : 1000 h ours 20 stability no mechanical damage. variation of internal resistance should be less than 10%. temperature : 125 3 c duration : 1000 h ours performance +48 - 0 +48 - 0 +48 - 0 +48 - 0 3
distribution of fusing time distribution of fusing characteristics i 2 t - t characteristics fusing characteristics reference reference jad 2402 102 na jad 2402 2 02 na 0.001 0.01 0.1 1 10 100 1000 0.001 0.01 0.1 1 10 100 fusing time (s) joule integral (a 2 s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.0001 0.001 0.01 0.1 1 0 1000 2000 3000 4000 5000 numberas of pcs fusing time (s) 800% rated current is applled 200% rated current is applled 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.0001 0.001 0.01 0.1 1 0 1000 2000 3000 4000 5000 numberas of pcs fusing time (s) 800% rated current is applled 200% rated current is applled 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 1000 0.001 0.01 0.1 1 10 100 fusing time (s) joule integral (a 2 s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.0001 0.001 0.01 0.1 1 0 1000 2000 3000 4000 5000 numberas of pcs fusing time (s) 800% rated current is applled 200% rated current is applled 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.0001 0.001 0.01 0.1 1 0 1000 2000 3000 4000 5000 numberas of pcs fusing time (s) 800% rated current is applled 200% rated current is applled 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 1000 0.001 0.01 0.1 1 10 100 fusing time (s) joule integral (a 2 s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 0.1 1 10 100 applied current (a) fusing time (s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 0.001 0.01 0.1 1 10 100 1000 0.001 0.01 0.1 1 10 100 fusing time (s) joule integral (a 2 s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 4
determine the rated value of circuit protection element, and select the correct circuit protection element for your circuit. if you select the correct circuit protection element, safety of your circuit can be ensured. how to determine the rated value of the circuit protection element is described below : flow for fuse selection 1. measurement of circuit values using actual device measure the circuit values, such as operating current of the circuit. 2. cal culation from operating current from the obtained operating current and the category temperature, calculate the minimum rated value to determine the applicable fuse. 3. calculation from overload current from the obtained overload current, calcu late the maximum rated value to determine the applicable fuse. 4. calculation from inrush current from the inrush current, calculate the minimum rated value to determine the applicable fuse. 5. final determination of rated value from the ca lculation results of steps 2 through 4, determine the rated value. 6. operation check using actual device after selecting the rating, confirm if the device works properly under the pre - determined conditions. fuse selection 1. measurement of circu it values using actual device before determining the rated value of the fuse, preliminarily measure the following using the actual device. 1 C 1 operating current using an oscilloscope or equivalents, measure the operating current of the circuit. 1 C 2 overlo ad current using an oscilloscope or equivalents, measure the overload current that needs to break the circuit. 1 C 3 inrush current using an oscilloscope or equivalents, measure the inrush current of the circuit at power - on or power - off. in addition, determi ne the number of inrush current applied. 1 C 4 category temperature measure the ambient temperature of the fuse circuit. example to selec t ratings of type ja d effective operating current : 1.2 a effective overload current : 6.0 a inr ush current waveform : fig. a (pulse width : 1 ms, wave height : 10 a) numbers to withstand inrush current : 100,000 times category temperature : 85c 2. calculation from operating current 2 C 1 measurement of operating current using an oscilloscope or equivalents, measure operating current (effective current) of the actual circuit. example : effective operating current = 1.2 a 2 C 2 derating temperature derating factor using fig. b, find the temperature derating factor correspond to the temperature. rated derating factor rated derating factor = 0.78 (constant irrespective of temperature) use formula 1 to calculate the rated current of the fuse to be used for the circuit. rated current of fuse operating current / ( ) ... formula 1 example: cate gory temperature = 85c, operating current = 1.2 a t emperature derating factor = 0. 9 6 (refer to fig. b.) rated derating factor = 0.78 (constant irrespective of temperature) calculation using formula 1 : rated current 1.2 / (0. 9 6 0.78 ) = 1. 6 a the abo ve calculation result shows that the fuse with rated current of 1. 6 a or more should be selected for this circuit. type ja d , with rated current of 1. 6 a or more can be selected. determi nation of rated value and selection of micro fuse (type ja d ) 10 a fig. a : inrush current waveform 1ms fig. b 5 0% 20% 40% 60% 80% 100% 120% -50 -25 0 25 50 75 100 125 temerature(
3. calculation from overload current 3 C 1 measurement of overload current u sing oscilloscope or equivalents, measure the overload current that needs to break the circuit. example : effective overload current = 6.0 a 3 C 2 calculation from overload current determine the rated current so that the overload current can be 2. 0 times la rger than the rated current. use formula 2 to calculate the rated current of the fuse. rated current of fuse overload current / 2. 0 ... formula 2 example : overload current = 6.0 a use formula 2 to calculate the rated current. rated current 6.0 / 2. 0 = 3.0 a the above calculation result shows that th e fuse with rated current of 3.0 a or less should be selected for this circuit. type ja d , with rated current of 2. 5 a or less can be selected. 4. calculation from inrush current 4 C 1 measurement of in rush current waveform using an oscilloscope or equivalent, measure the waveform of the inrush current of the actual circuit. 4 C 2 creation of approximate waveform generally, the waveform of inrush current is complicated. for this reason, cr eate the approximate waveform of inrush current as shown on fig. c to simplify calculation. 4 C 3 calculation of ? 2 t of inrush current calculate ? 2 t (joule integral) of the approximate waveform. the formula for this calculation depends on the approximate waveform. refer to table a. example : pulse applied = 1 ms, peak value = 1 0 a, approximate waveform = triangula r wave since the approximate waveform is a triangular wave, use the following formula for calculation. ? 2 t of rush current = 1 / 3 ? m 2 t ... formula 3 ( ? m : peak value, t : pulse applying time) use formula 3 to calculate ? 2 t of the rush current : ? 2 t = 1 / 3 1 0 1 0 0.001 = 0. 033 (a 2 s) following formula is generally used for calculation of ? 2 t as i(t) equal to current. ? 2 t 0 ? ? 2 t dt name waveform ? 2 t name waveform ? 2 t sine wave (1 cycle ) trapezoidal wave sine wave (half cycle) various wave 1 triangular wave various wave 2 rectangular wave charge/ discharg e waveform joule - integral values for each waveform fig. c : inrush current waveform red line : actual measurement waveform black line : approximate waveform 1 0 a 1ms 1 3 ? ? m 2 t 1 + ? ? m 2 (t 2 - t 1 ) + ? ? m 2 (t 3 - t 2 ) 1 3 ? m t 0 1 2 t ? m 0 0 t ? ? m 0 t ? ? m 0 - t ? i ( t ) = ? m e - t/ ? ? m 0.368 ? m ? 2 1 t 1 +{ ? 1 ? 2 + ( ? 1 - ? 2 ) 2 } (t 2 - t 1 )+ ? 2 2 (t 3 - t 2 ) 1 3 1 3 1 3 1 3 ? ? m 2 t ? ? m 2 t 1 2 ? ? m 2 t 1 2 ? ? m 2 t t 2 t 3 ? m 0 t 1 t ? 2 0 ? 1 t 2 0 t 1 t 3 ? 2 ? 1 ? ? m 2 t 1 2 ? 1 ? 2 t + ( ? 1 - ? 2 ) 2 t 1 3 table a 6
4 C 4 search of load ratio set up the number of cycles to withstand. (generally 100,000 times) obtain the load ratio from pulse re sistance characteristics. (fig. d) example : 100,000 times is required against inrush current applied. the load ratio is 20% or less from fig. d. 4 C 5 calculation from joule integral and load ratio use formula 4 to calculate the standard , 2 t for the fuse to be used. standard , 2 t of fuse > ( , 2 t of inrush current / load ratio) ..........formula 4 example : , 2 t of pulse = 0. 033 a 2 s, pulse applied = 1 ms, required load ratio = 20% fr om formula 4, standard , 2 t of fuse > 0. 033 / 0.2 = 0. 17 (a 2 s) the standard , 2 t of the fuse should be 0. 17 (a 2 s) or more. since the rush pulse applied is 1 ms, obtain the intersection of 1 ms (horizontal axis) and 0. 17 a 2 s (vertical axis) from fig. e (refe r to the arrow shown in fig.e). select a fuse whose curve is above the intersection. type ja d , with rated current of 1.6 a or more should be selected. 5. final determination of rated value determine the rated current of the micro fuse. the rated current should meet all the calculation results. example : 1.6a, 2.0 a and 2.5a meet the all requirement. 6. operation check using actual device after selecting the rating, confirm if the device works properly under the pre - determined conditions. pulse resistance characteristics joule integral vs. fusing time fig. d fig. e 0.001 0.01 0.1 1 10 100 1000 0.0001 0.001 0.01 0.1 1 10 100 fusing time (s) joule integral (a 2 s) 0.50a 1.00a 0.80a 4.00a 2.50a 2.00a 1.25a 3.15a 1.60a 1 10 100 1000 10000 100000 1000000 0 10 20 30 40 50 60 70 80 90 100 numbers of pulse resistance (cycle) load ratio 7
please feel free to ask our sales department for more information on the micro fuse. overseas sales dep. 5-3,3-chome,sennari-cho,toyonaka-shi,osaka 561-8558,japan tel : 06-6332-0883 fax : 06-6332-0920 head office 5-3,3-chome,sennari-cho,toyonaka-shi,osaka 561-8558,japan tel : 06-6332-0871 fax : 06-6331-1386 url http://w w w .ncc-matsuo.co.jp/ r matsuo matsuo electric co., ltd. specifications on this catalog are subject to change without prior notice. please inquire of our sales department to confirm specifications prior to use. application notes for micro fuse 1. circuit design 5. caution during usage micro fuse should be designated only after confirming (1) micro fuse with electricity should never be touched. micro operating conditions and the micro fuse performance fuse with electricity may cause burning due to the micro characteristics. fuse high temperature. also, in case of touching micro when determining the rated current, be sure to observe the fuse without electricity, please check the safety following items : temperature of micro fuse. (1) micro fuse should always be operated below the rated (2) protective eyeglasses should always be worn when current (the value considered in the temperature derating performing fusing tests. however, there is a fear that micro rate) and voltage specifications.according to item 2,2-2 in fuse will explode during test. during fusing tests, please page 5. cover particles not to fly outward from the board or testing (2) micro fuse should always be operated below the rated fixture. caution is necessary during usage at all times. voltage. (3) micro fuse should be selected with correct rated value to 6. environmental conditions be fused at overload current. (1) micro fuse should not be operated in acid or alkali corrosive (4) when micro fuse are used in inrush current applications, atmosphere. please confirm sufficiently inrush resistance of micro fuse. (2) micro fuse should not be vibrated, shocked, or pressed (5) please do not apply the current exceeding the breaking excessively. current to micro fuse. (3) micro fuse should not be operated in a flammable or (6) use micro fuse under the condition of category explosive atmosphere. temperature. (4) after mounting micro fuse on a board, covering fuses with (7) micro fuse should not be used in the primary power source. resin may affect to the electric characteristics of the micro fuse. please be sure to evaluate it in advance. micro fuse should be selected by determining the operating conditions that will occur after final assembly, or 7. emergency estimating potential abnormalities through cycle testing. in case of fire, smoking, or offensive odor during operation, please cut off the power in the circuit or pull the plug out. 2. assembly and mounting during the entire assembly process, observe micro fuse 8. storage body temperature and the heating time specified in the (1) micro fuse should be stored at room temperature (-10c ~ performance table. in addition, observe the following items : +40c) without direct sunlight but not in corrosive atmosphere (1) mounting and adjusting with soldering irons are not such as h 2 s products or devices in the market. samples are provided ultrasonic cleaning is not recommended for micro fuse. for a particular purpose such as configuration, confirmation this may cause damage to the micro fuse such as broken of electrical characteristics, etc. terminals which results in electrical characteristics effects, etc. depending on the conditions. if ultrasonic cleaning process must be used, please evaluate the effects sufficiently before use. 8
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