2322 640 90004/98004
Vishay BCcomponents
NTC Thermistors, Molded Range
FEATURES
• Designed for harsh environments
• Excellent for surface temperature measurement
• Metal strip for heat conduction and easy mounting
(2322 640 98004)
• High accuracy at 100 °C
• Minimum 350 V dielectric withstanding voltage
APPLICATIONS
High temperature measurement control:
DESCRIPTION
QUICK REFERENCE DATA
Molded chip thermistor with negative temperature control
and two solid tinned nickel leads. The body color is white and
the device is non-flammable.
VALUE
PARAMETER
2322 640
90004
2322 640
98004
The thermistor 2322 640 98004 is provided with a metal strip
for mounting.
Resistance value at:
+25 °C
12 kΩ
+100 °C
950 Ω
MARKING
Tolerance on R25-value:
+25 °C
The thermistors are marked with a grey dot.
±7%
±5%
+100 °C
MOUNTING
B25/85-value
3750 K
2322 640 90004: by soldering in any position
2322 640 98004: by means of the mounting strip.
Temperature coefficient
Maximum dissipation
Dissipation factor
−4.2%/K
0.25 W
7 mW/K
9.5 mW/K
27 mW/K
33 s
PACKAGING
when mounted on a heatsink; note 1 19 mW/K
The thermistors are packed in cardboard boxes:
2322 640 90004: 500 units
Thermal time constant
19 s
10 s
when mounted on a heatsink; note 2
Heat capacity of ceramic (in air)
when mounted on a heatsink
Response time; note 2
5 s
0.028 J/K
0.13 J/K
0.028 J/K
0.3 J/K
2322 640 98004: 400 units.
3 s
DIMENSIONS in millimeters
Operating temperature range:
at zero dissipation
−10 to +125 °C
0 to +55 °C
min. 350 V
2.5 ±0.2
4 ±0.2
3.6 ±0.4
18 ±0.2
0.6
at maximum dissipation
Dielectric withstanding voltage
(RMS) between terminals and
coating
R 1.25
Insulation resistance between
min. 100 MΩ
terminals and coating at 100 V (DC)
Mass
≈0.3 g
≈0.5 g
Notes
dia0.6
0.6 ±0.06
2.54 ±0.3
1. Measurements made in still air with the thermistor mounted on a
heatsink of 100 cm2, thickness 1.5 mm, connected between
phosphor-bronze wires (∅1.3 mm).
2.54 ±0.3
2. The thermistor being transferred from ambient air of +25 °C to a
silicone oil (MS200/50) bath of 85 °C.
5.3 ±0.4
Component outline 2322 640 90004.
www.vishay.com
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For technical questions contact: nlr.europe@vishay.com
Document Number: 29067
Revision: 10-Oct-03