l d w h d temperature sensing chip resistor (p.t.c. thermistor) type lt73 series literature no. 1773244 issued: 04-05 dimensions are shown for reference purposes only. dimensions are in millimetres unless otherwise specified. specifications subject to change. www.tycoelectronics.com passives.tycoelectronics.com key features stable alumina substrate solvent resistant coating wide value range excellent linearity 08 05 small size stocked in 3900ppm/? other tcr's available to order supplied on tape and reel custom design enquiries welcome type lt73 series this tiny thin film chip is manufactured by sputtering pure metals onto a high purity alumina base. this process ensures the element remains stable in performance over a long life. the lt73 is equally suited to temperature compensation or thermal protection when incorporated within the appropriate electronics. this range of sensors are finished in a tough epoxy seal and are available on tape for high speed auto placement. characteristics - electrical characteristics - mechanical 0805 size (2a) 1206 size (2b) resistance range: 510r - 3k0 510r - 6k2 resistance tolerance: ?% 5% rated power at 70?: 0.1 watt 0.125 watt max. working voltage @ t a 70?: 50 volts 75 volts max. overload voltage @ t a 70?: 100 volts 150 volts operating temperature range: -40? ~ +125? -40? ~ +125? tcr measuring temperature: +25? ~ +75? (see graph) +25? ~ +75? (see graph) tcr tolerance: 10% 10% insulation resistance: more than 10 meg more than 10 meg dimensions seal cover: orange marking ink colour: black characteristics - cleaning the washing process is very important to ensure long term reliability because ionic impurity from flux may cause electrolytic corrosion of the metal film. short time overload: rated voltage x 2.5 maximum overload voltage for 5 seconds, whichever is less resistance to soldering heat: 260? 5?, 10 seconds 1 second solderabililty: 235? 5?, 3 seconds 0.5 second lt73 3900 2a 103 1k0 j common part 3000ppm/? 3900ppm/? t.c.r size lt73 - standard 2a - 0.1w 2b - 0.125w resistance value j ?% tolerance pack style the first two digits are significant figures of resistance value and the third denotes the number of zeros following. e.g. 510r: 511 1k0: 102 3k0: 302 taped - 4000 on reel how to order chip lwhd d weight size /1000 2a-0805 2.0?.2 1.25?.2 0.5?.1 0.4?.2 0.35?.15 4.54g 2b-1206 3.2?.2 1.60?.2 0.6?.1 0.5?.3 0.45?.15 9.14g power derating -50 -25 0 25 50 75 100 125 ambient temperature (?) ? r (%) 60 50 40 30 20 10 0 -10 -20 -30 4500 3300 2400 1600 tcr (ppm/?) -55 -25 0 30 60 70 90 120 125 100 80 60 40 20 0 rated power (%) ambient temperature (?)
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