g NTC THERMISTORS: TYPE NHQM SURFACE MOUNT CHIP 0805 SIZE DESCRIPTION: DIMENSIONS: A range of 0805 size surface mount NTC chip thermistors. FEATURES: * Palladium silver electrodes with nickel barrier and solder plating * Intended for temperature measurement, control and compensation * Excellent solderabilty without `tombstoning' * Suitable for standard soldering techniques * Glass-coated ceramic between electrodes for improved stability DATA: Soldering Recommendations: Maximum storage time in closed package....1 year Maximum storage time exposed to ambient conditions of I5C - 30C, 15% - 70% RH ...30 days Drying prior to soldering: not to exceed 48h at 80C ............................................ or 16h at 100C .............................................. or 8h at 125C Flux type .......................................... R or RMA Flow soldering conditions: Preheat temperature .................... 80 - 150C Max rate of change of temperature ....... 2.5C/s Max solder temperature ......................... 265C Max dwell time ........................................ 10s Cooling in ambient or air flow of ............... 5m/s Reflow soldering conditions: Method ........................ infrared, hot gas, vapor Max rate of change preheat temperature . 2.5C/s Max Temp ............................................ 225C Max time above 200C ............................. 30s Max radiant flux (0. 1 to 100W ) ........ 5W/cm2 Max hot air temperature ........... 275C at 4 m/s Max vapor temperature .......................... 215C Max rate of cooling .............................. 2.5C/s Cleaning: Ultrasonic cleaning in methanol or isopropanol not exceeding 40 kHz for 5 minutes or aqueous cleaning not exceeding 70C for 7 minutes, is recommended. Resistance tolerance at 25C .................. 5% ........... (for 10% replace R5 by R10 in code) Tolerance on B value .......................... 200 K Minimum temperature ............................ -40C Maximum temperature .......................... 125C Dissipation factor ............................. 1.5mW/K Time constant ..................................... 5s max 0.4 0.2mm 1.25 0.2mm 2.0 0.2mm 1.2 mm max Code NHQM400B280R5 NHQM800B280R5 NHQM101B280R5 NHQM221B310R5 NHQM471B325R5 NHQM501B325R5 NHQM801B325R5 NHQM102B325R5 NHQM152B345R5 NHQM202B410R5 NHQM252B410R5 NHQM272B410R5 NHQM302B410R5 NHQM472B355R5 NHQM502B355R5 NHQM682B375R5 NHQM103B375R5 NHQM153B400R5 NHQM20B4003R5 NHQM223B400R5 NHQM273B400R5 NHQM303B400R5 NHQM333B400R5 NHQM473B415R5 NHQM503B415R5 NHQM104B425R5 NHQM154B425R5 NHQM304B425R5 NHQM474B435R5 NHQM504B435R5 R25 40 80 100 220 470 500 800 1000 1500 2000 2500 2700 3000 4700 5000 6800 10000 15000 20000 22000 27000 30000 33000 47000 50000 100000 150000 300000 470000 500000 B 25/85 K 2800 2800 2800 3100 3250 3250 3250 3250 3450 4100 4100 4100 4100 3550 3550 3750 3750 4000 4000 4000 4000 4000 4000 4150 4150 4250 4250 4250 4350 4350 Data sheet D-NHQM-4 Crown Industrial Estate, Priorswood Rd Taunton, Somerset TA2 8QY UK Tel +44 (0)1823 335200 Fax +44 (0)1823 332637 808 US Highway 1 Edison, New Jersey 08817-4695 USA Tel +1 (732) 287 2870 Fax +1 (732) 287 8847 967 Windfall Road St Marys, Pennsylvania 15857-3397 USA Tel +1 (814) 834 9140 Fax +1 (814) 781 7969