14 qtc11 (ntc) series ntc surface mount chip thermistors engineering information thermal time constant*: 10 seconds maximum in still air dissipation constant*: .625mw/c minimum power rating: .0625w, derate to 0 at 125 (see table 2) resistance at 25?: 100 ohm to 20 mohm (see table 1). *thermal time and dissipation constant may vary depending on mounting. t he qtc11 ntc chip thermistors are designed for die attach and wire-bonding requirements found in today s hybrid microelectronics circuits. the qtc11 series is offered in a gold or silver termination finish for high-reliability conductive epoxy/wire bonded attachment. applications may include localized temperature sensing, temperature compensation, protection, and frequency control for sensitive communications systems and infrared sensing equipment. the qtc11 series is available for applications requiring narrow band, temperature point matching control and is also available in a military grade dscc (defense supply center columbus) version. contact quality thermistor's applications engineering department for details. quality thermistor, inc. is as9100 certified ordering information tolerance code number of zeros 1st 2 resistance digits g for gold, s for silver r/t curve part number tolerance code: k = 10% j = 5% g = 2% f = 1% qtc11 z g-10 3 j dimensions qtc11 ntc style l = .040" +/?.010" w = .040" +/?.010" t = .020" max part number resistance @25c (ohms) alpha @ 25c qtc11x -101j 100 -3.1% -201j 200 -3.1% -301j 300 -3.1% -501j 500 -3.1% qtc11y -102j 1k -3.9% -202j 2k -3.9% -302j 3k -3.9% qtc11z -502j 5k -4.4% -103j 10k -4.4% -203j 20k -4.4% -303j 30k -4.4% qtc11s -103j 10k -4.0% qtc11w -503j 50k -4.7% qtc11v -104j 100k -4.9% -204j 200k -4.9% qtc11p -504j 500k -5.3% -105j 1m -5.3% -205j 2m -5.3% qtc11r -106j 10m -6.2% -206j 20m -6.2% 100 80 60 40 20 0 -55 -20 0 20 40 80 120 140 160 25? 125? table 2 derating curve for high ambient temperatures ambient temperature (?) percent of maximum power contact quality thermistor for resistance values not listed above. table 1 surface mount ntc thermistors
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