NTC THERMISTORS: TYPE NHQT
SURFACE MOUNT CHIP 0402 SIZE
DESCRIPTION:
A range of 0402 size surface mount NTC chip
thermistors.
DIMENSIONS:
0.2 –
0.1mm
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
0.5
– 0.15 mm
1.0 + 0.15 mm
- 0.10 mm
0.45
– 0.15mm
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/cm
2
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.
Code
NHQT400B285R5
NHQT500B285R5
NHQT600B285R5
NHQT101B285R5
NHQT151B285R5
NHQT102B330R5
NHQT202B410R5
NHQT252B410R5
NHQT302B410R5
NHQT332B410R5
NHQT352B410R5
NHQT402B410R5
NHQT652B410R5
NHQT153B380R5
NHQT203B380R5
NHQT223B380R5
NHQT303B400R5
NHQT473B400R5
NHQT683B400R5
NHQT104B425R5
NHQT154B425R5
NHQT204B425R5
R25
Ω
40
50
60
100
150
1000
2000
2500
3000
3300
3500
4000
6500
15000
20000
22000
30000
47000
68000
100000
150000
200000
B 25/85 K
2850
2850
2850
2850
2850
3300
4100
4100
4100
4100
4100
4100
4100
3800
3800
3800
4000
4000
4000
4250
4250
4250
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 ..................................... 4s max
D-NHQT-1
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Taunton, Somerset TA2 8QY UK
Tel +44 (0)1823 335200
Fax +44 (0)1823 332637
Email: info@thermometrics.com
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