0.2 mm 0.ꢀ mm
(0.078 in 0.00ꢁ in)
Type NHQT
Specification
Surface mount chip 0402 size
Description
A range of 0402 size surface mount NTC
chip thermistors.The terminations are nickel
barrier with tin plating.
General
ꢀ mm 0.ꢀ5 mm
(0.039ꢁ in 0.006 in)
Soldering Recommendations
• Maximum storage time in closed package:
One year
NTC Type NHQT Outline Drawing
• Maximum storage time exposed to
ambient conditions of 59°F to 86°F (15°C
to 30°C), 15% to 70% RH: 30 days
• Drying prior to soldering: Not to exceed
48h at 176°F (80°C) or 16h at 212°F
(100°C) or 8h at 257°F (125°C)
• Flux type: R or RMA
Code
R25 W
B (25/85)
NHQT500B285T5
50
2850
NHQT202B410T5
NHQT252B410T5
2000
2500
4100
4100
Flow Soldering Conditions
• Preheat temperature: 176°F to 302°F (80°C
to 150°C)
• Maximum rate of temperature change:
4.5°F/s or 2.5°C/s
• Maximum solder temperature: 509°F
(265°C)
• Maximum dwell time: 10 seconds
• Cooling in ambient or air flow of 5m/s
NHQT332B410T5
NHQT352B410T5
NHQT402B410T5
NHQT652B410T5
NHQT153B380T5
NHQT203B380T5
NHQT223B380T5
NHQT303B400T5
NHQT473B400T5
NHQT683B400T5
NHQT154B425T5
3300
4100
4100
4100
4100
3800
3800
3800
4000
4000
4000
4250
3500
4000
6500
15000
20000
22000
30000
47000
68000
150000
Reflow Soldering Conditions
• Method infrared, hot gas, vapor
• Maximum rate of preheat temperature
change: 4.5°F/s or 2.5°C/s
• Maximum temperature: 437°F (225°C)
• Maximum time above: 392°F (200°C) 30
seconds
• Maximum radiant flux: (0.1 to 100 Wµ) 5
Wµ/cm2
• Maximum hot air temperature: 527°F
(275°C) at 4 m/s
Data
• Resistance tolerance at 77°F (25°C) ±5%;
for ±10% replace T5 by T10 in code
• Tolerance on B value ±200 K
• Maximum vapor temperature: 419°F
(215°C)
• Maximum rate of cooling: 4.5°F/s or
2.5°C/s
• Minimum temperature: -40°F (-40°C)
• Maximum temperature: 257°F (125°C)
• Dissipation factor: 1.5 mW/K
• Time constant: 4 seconds maximum
Cleaning
Ultrasonic cleaning in methanol or
isopropanol notexceeding 40 kHz for 5
minutes, or aqueous cleaning not exceeding
158°F (70°C) for 7 minutes (recommended).
5