297 www.meder.com meder electronic mms series description the mms is a ultra-small magnetically actuated reed sensor (spst) that requires no power. it is manufactured by using semiconductor wafer technology. its biggest advantages are the small dimensions with 4.8 mm x 2.05 mm (0.189x 0.081). applications ? medical pacemakers and insulin pumps ? telecommunications ? cmos gates and other low power signals switching features ? smt reed sensors (spst) in miniature size ? requires no power ? ultra-small dimensions ? designed for switching low power devices (max. 3 vdc) ? 10 9 ohm insulation resistance across the contacts ? magnetic sensitivity ranges from 1.8 to 4.0 millitesla ? preferably packaged in tape & reel according to iec 286/part 3, waffe package possible ? electrostatic sensitive device!! dimensions all dimensions in mm [inches] unspecifed tolerances +/- 0.1 mm micro machined sensors lead design 1 lead design 2
298 www.meder.com meder electronic mms series pad layout lead design 1+2 packaging order information part number example mms - b - 1 b is the magnetic sensitivity 1 defnes the lead design series sensitivity class lead design mms b 1,2 micro machined sensors
299 www.meder.com meder electronic micro machined sensors mms series contact data all data at 20 c contact form --> form a / d ry contact ratings conditions min. typ. max. unit switching power any dc combination of v & a not to exceed their individual max.s 0.3 mw switching voltage dc or peak ac 3.0 v switching current dc or peak ac 100 a carry current dc or peak ac 100 a static contact resistance measured w/ 0.5 v & 50 a 50 1000 insulation resistance across contacts 25 volt applied 10 9 breakdown voltage across contacts 50 vdc operate time incl. bounce measured w/ 40 % overdrive 0.1 0.2 ms release time measured w/ no coil suppression 0.05 0.1 ms capacitance at 10 khz across contact 0.2 0.5 pf life expectancies switching voltage 1.5 v & 15 a 10 7 cycles magnetic characteristics pull-in ramped in 0.1 mt/ms steps 1.8 4.0 mt drop-out ramped in 0.1 mt/ms steps 0.5 3.2 mt environmental data shock resistance any direction 5000 g vibration resistance from 10 - 2000 hz 30 g ambient temperature 10c/ minute max. allowable -20 100 o c stock temperature 10c/ minute max. allowable -55 150 o c soldering temperature 3.5 sec. at 260 o c cleaning fully sealed packaging tape & reel 17.78 mm reel (7 inch), 12 mm width, 4 mm ptich marking on tape & reel packaging a: supplier part number b: supplier lot number / date code c: quantity
300 www.meder.com meder electronic mms series attention a ttentio n obser ve precautions for handling electronst at ic sensitive devices these devices are especially designed for low voltage and low power switching! the following points must be respected when the device is connected in a circuit: voltage spikes (electrostatic or otherwise) across the terminals in the open mode are limited to 10 dv/dt switched voltages and current are limited to the maxi - mum ratings the parallel capacitance added across the switch is less than 100 pf minimize stray capacitance to less than 100 pf in any lead circuit the mounting and test equipment are properly grounded, as they may induce voltage spikes across the terminals all handling is performed on a conductive mat, and the operator is also grounded through a wrist contact bracelet permanent sticking or damage of the contacts may result whenever any of the above warnings is not respected . ? ? ? ? ? ? ? micro machined sensors
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