808 US Highway 1
Edison, New Jersey 08817-4695 USA
Tel +1 (732) 287 2870
Fax +1 (732) 287 8847
Crown Industrial Estate, Priorswood Rd
Taunton, Somerset TA2 8QY UK
Tel +44 (0)1823 335200
Fax +44 (0)1823 332637
967 Windfall Road
St Marys, Pennsylvania 15857-3397 USA
Tel +1 (814) 834 9140
Fax +1 (814) 781 7969
NTC THERMISTORS: TYPE NHQM
SURFACE MOUNT CHIP 0805 SIZE
DESCRIPTION:
A range of 0805 size surface mount NTC chip
thermistors.
DIMENSIONS:
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
Resistance tolerance at 25°C .................. ± 5%
........... (for± 10% replace R5 by R10 in code)
Tolerance on B value .......................... ±200 K
Minimum temperature ............................ -40°C
Maximum temperature .......................... 125°C
Dissipation factor ............................. 1.5mW/K
Time constant ..................................... 5s max
DATA:
Soldering Recommendations:
Maximum storage time in closed package....1 year
Maximum storage time exposed to ambient
conditions of I5°C - 30°C, 15% - 70% RH ...30 days
Drying prior to soldering: not to exceed 48h at 80°C
............................................ or 16h at 100°C
.............................................. or 8h at 125°C
Flux type .......................................... R or RMA
Flow soldering conditions:
Preheat temperature .................... 80° - 150°C
Max rate of change of temperature ....... 2.5°C/s
Max solder temperature ......................... 265°C
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 . 2.5°C/s
Max Temp ............................................ 225°C
Max time above 200°C ............................. 30s
Max radiant flux (0. 1 to 100W µ) ........ 5W/cm2
Max hot air temperature ........... 275°C at 4 m/s
Max vapor temperature .......................... 215°C
Max rate of cooling.............................. 2.5°C/s
Cleaning:
Ultrasonic cleaning in methanol or isopropanol not
exceeding 40 kHz for 5 minutes or aqueous clean-
ing not exceeding 70°C for 7 minutes, is recom-
mended.
0.4 ±
0.2mm
1.25 ±
0.2mm
1.2 mm max
2.0 ± 0.2mm
Code R25 Ω
Ω Ω
Ω B 25/85 K
NHQM400B280R5 40 2800
NHQM800B280R5 80 2800
NHQM101B280R5 100 2800
NHQM221B310R5 220 3100
NHQM471B325R5 470 3250
NHQM501B325R5 500 3250
NHQM801B325R5 800 3250
NHQM102B325R5 1000 3250
NHQM152B345R5 1500 3450
NHQM202B410R5 2000 4100
NHQM252B410R5 2500 4100
NHQM272B410R5 2700 4100
NHQM302B410R5 3000 4100
NHQM472B355R5 4700 3550
NHQM502B355R5 5000 3550
NHQM682B375R5 6800 3750
NHQM103B375R5 10000 3750
NHQM153B400R5 15000 4000
NHQM20B4003R5 20000 4000
NHQM223B400R5 22000 4000
NHQM273B400R5 27000 4000
NHQM303B400R5 30000 4000
NHQM333B400R5 33000 4000
NHQM473B415R5 47000 4150
NHQM503B415R5 50000 4150
NHQM104B425R5 100000 4250
NHQM154B425R5 150000 4250
NHQM304B425R5 300000 4250
NHQM474B435R5 470000 4350
NHQM504B435R5 500000 4350
Data sheet D-NHQM-4
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