NTC Accurate Thermistors
NJ 28 – NI 24 – NK 20
High precision resistance and an outstanding ability to
reproduce the sensibility index B, make these ranges of
products the types of thermistors ideal for temperature
measurement applications.
Types
Finish
NJ 28
Coated chip with phenolic
resin + varnish
+ tinned copper wires
2.8 (.110) max 2.8 (.110) max
Leaded or unleaded, these small size and rapid response
time thermistors are able to meet the most accurate
requirements.
NP 30
Coated chip with epoxy
3.0 (.118) max
3.0 (.118) max
NI 24
Coated chip with epoxy
AWG30 insulated leads
+ Silver plated nickel wires
2.4 (.094) max
2.4 (.094) max
0.75 (.030)
±
0.25 (.010)
NK 20
Chip
3 (.118) max
3 (.118) max
35 (1.38) min
35 (1.38) min
35 (1.38) min
DIMENSIONS:
millimeters (inches)
3 (.118) max
0.4 (.016)
+10 %
- 15%
0.4 (.016)
+10%
-15%
0.57 (.022)
+7%
-7%
1.75 (.069)
±
0.25 (0.10)
Marking
Operating temperature
Tolerance on Rn (25°C)
Maximum dissipation at 25°C
Thermal dissipation factor*
Thermal time constant
Response time
3 mW/°C
8s
On packaging only
-55°C to +150°C
±1%, ±2%, ±3%
0.16 W
3 mW/°C
8s
<2s
2 mW/°C
6s
TABLE OF VALUES
Types
N_ _ _ KA 0202
N_ _ _ MA 0302
N_ _ _ MA 0502
N_ _ _ MA 0103
N_ _ _ NA 0103
N_ _ _ PA 0203
N_ _ _ QA 0503
N_ _ _ RA 0104
Rn at 25°C (Ω)
2,000
3,000
5,000
10,000
10,000
20,000
50,000
100,000
Material Code
KA
MA
MA
MA
NA
PA
QA
RA
B (K)
3625 ± 1%
3960 ± 0.5%
3960 ± 0.5%
3960 ± 0.5%
4100 ± 1%
4235 ± 1%
4250 ± 1%
4380 ± 1%
at 25°C (%/°C)
– 4.1
– 4.5
– 4.5
– 4.5
– 4.6
– 4.8
– 4.8
– 4.9
* – = Add type as outlined above (Example NJ 2 8).
Resistance - Temperature characteristics: pages 36 to 40.
HOW TO ORDER
NJ28
MA
0502
F--
Type
Material Code
MA
(See table above)
Resistance
5 kΩ
Tolerance
F (±1%)
1.
±
75 (
0. .0
25 69
(0 )
.1
0)
19
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