-
Nickel
Barrier (Tin-Lead
wrap around (3-sided) terminations)
-
Tape
& Reeling
-
0805,
and 0603 Sizes
-
3%,
5% and 10% Tolerances
-
NTC
Thick Film on Alumina Substrate (100%
Solid State)
Applications
Specifications
Thermal Time Constant: <5 Sec. (Time required for
a 63.2% change in resistance when temperature is changed)
|
Part
Number
|
W
@ 25 °C
+/- 10%
|
Curve
|
TCR @ 25
°C
(%/C) |
Dimensions
in inches (millimeters)
|
|
A
+/- 0.012" (0.30mm)
|
B
+/- 0.012" (0.30mm)
|
C
+/- 0.012" (0.30mm)
|
D
+/- 0.012" (0.30mm)
|
|
WM075D201
|
200
|
D
|
-3.30 |
0.100
(2.54)
|
0.052
(1.32)
|
0.085
(2.2)
|
0.018
(0.46) |
|
WM080D251
|
250
|
D
|
-3.30 |
0.100
(2.54)
|
0.040
(1.02)
|
0.085
(2.2)
|
0.018
(0.46) |
|
WM085D501
|
500
|
D
|
-3.30 |
0.110
(2.79)
|
0.035
(0.89)
|
0.060
(1.5)
|
0.018
(0.46) |
|
WM090D681
|
680
|
D
|
-3.30 |
0.110
(2.79)
|
0.032
(0.81)
|
0.060
(1.5)
|
0.018
(0.46) |
|
WM095D102
|
1000
|
D
|
-3.30 |
0.125
(3.18)
|
0.030
(076)
|
0.040
(1.0)
|
0.018
(0.46) |
|
WM100K252
|
2500
|
K
|
-3.83 |
0.110
(2.79)
|
0.050
(1.27)
|
0.080
(2.0)
|
0.018
(0.46) |
|
WM105K502
|
5000
|
K
|
-3.83
|
0.100
(2.54)
|
0.039
(0.99)
|
0.058
(1.5)
|
0.018
(0.46) |
|
WM110K602
|
6000
|
K
|
-3.83 |
0.100
(2.54)
|
0.034
(0.86)
|
0.056
(1.4)
|
0.018
(0.46) |
|
WM115K702
|
7000
|
K
|
-3.83
|
0.100
(2.54)
|
0.029
(0.74)
|
0.056
(1.4)
|
0.018
(0.46) |
|
WM120K802
|
8000
|
K
|
-3.83 |
0.100
(2.54)
|
0.028
(0.71)
|
0.052
(1.3)
|
0.018
(0.46) |
|
WM125K103
|
10000
|
K
|
-3.83
|
0.100
(2.54)
|
0.023
(0.58)
|
0.051
(1.3)
|
0.018
(0.46) |
|
WM130K153
|
15000
|
K
|
-3.83 |
0.100
(2.54)
|
0.019
(0.48)
|
0.043
(1.1)
|
0.018
(0.46) |
|
WM150B303
|
30000
|
B
|
-4.40 |
0.100
(2.54)
|
0.038
(0.97)
|
0.060
(1.5)
|
0.018
(0.46) |
|
WM155B403
|
40000
|
B
|
-4.40 |
0.100
(2.54)
|
0.032
(0.81)
|
0.053
(1.3)
|
0.018
(0.46) |
|
WM160B503
|
50000
|
B
|
-4.40 |
0.100
(2.54)
|
0.027
(0.69)
|
0.053
(1.3)
|
0.018
(0.46) |
|
WM165B603
|
60000
|
B
|
-4.40 |
0.100
(2.54)
|
0.022
(0.56)
|
0.053
(1.3)
|
0.018
(0.46) |
|
WM170B803
|
80000
|
B
|
-4.40 |
0.100
(2.54)
|
0.017
(043)
|
0.053
(1.3)
|
0.018
(0.46) |
|
WM175B104
|
100000
|
B
|
-4.40 |
0.100
(2.54)
|
0.018
(0.46)
|
0.043
(1.1)
|
0.018
(0.46) |
Options:
-
Tape and Reeling
-
Special Resistance
Values
-
Optional Electrode
Materials (Pd-Ag, etc.)
-
Resistance Tolerance:
+/- 5% available (add -5 to part
number) example: WM105K502-5
Terminology:
TCR
(Temperature Coefficient of Resistance) - Defined
as a slope parameter using the following equation:
TCR = 1/Rt [(dRt)/(dT)]
CURVE
DATA (Temperature - Resistance)
CURVE
"K"
(0-70
in 1°C
increments)
| Temperature
|
Resistance
|
Temperature
|
Resistance |
|
°C |
°F |
Ratio
(R/R25) |
°C |
°F
|
Ratio
(R/R25) |
|
0
|
32
|
2.816
|
36
|
97
|
0.6641
|
|
1
|
34
|
2.692
|
37
|
99
|
0.6406
|
|
2
|
36
|
2.576
|
38
|
100
|
0.6181
|
|
3
|
37
|
2.465
|
39
|
102
|
0.5965
|
|
4
|
39
|
2.360
|
40
|
104
|
0.5758
|
|
5
|
41
|
2.260
|
41
|
106
|
0.5559
|
|
6
|
43
|
2.164
|
42
|
108
|
0.5368
|
|
7
|
45
|
2.074
|
43
|
109
|
0.5185
|
|
8
|
46
|
1.987
|
44
|
111
|
0.5008
|
|
9
|
48
|
1.905
|
45
|
113
|
0.4839
|
|
10
|
50
|
1.827
|
46
|
115
|
0.4676
|
|
11
|
52
|
1.751
|
47
|
117
|
0.4520
|
|
12
|
54
|
1.680
|
48
|
118
|
0.4370
|
|
13
|
55
|
1.612
|
49
|
120
|
0.4225
|
|
14
|
57
|
1.546
|
50
|
122
|
0.4085
|
|
15
|
59
|
1.485
|
51
|
124
|
0.3953
|
|
16
|
61
|
1.426
|
52
|
126
|
0.3823
|
|
17
|
63
|
1.370
|
53
|
127
|
0.3700
|
|
18
|
64
|
1.316
|
54
|
129
|
0.3581
|
|
19
|
66
|
1.264
|
55
|
131
|
0.3467
|
|
20
|
68
|
1.216
|
56
|
133
|
0.3356
|
|
21
|
70
|
1.168
|
57
|
135
|
0.3250
|
|
22
|
72
|
1.123
|
58
|
136
|
0.3147
|
|
23
|
73
|
1.080
|
59
|
138
|
0.3049
|
|
24
|
75
|
1.039
|
60
|
140
|
0.2954
|
|
25
|
77
|
1.0000
|
61
|
142
|
0.2862
|
|
26
|
79
|
0.9623
|
62
|
144
|
0.2774
|
|
27
|
81
|
0.9264
|
63
|
145
|
0.2689
|
|
28
|
82
|
0.8921
|
64
|
147
|
0.2607
|
|
29
|
84
|
0.8590
|
65
|
149
|
0.2527
|
|
30
|
86
|
0.8276
|
66
|
151
|
0.2450
|
|
31
|
88
|
0.7973
|
67
|
153
|
0.2377
|
|
32
|
90
|
0.7684
|
68
|
154
|
0.2305
|
|
33
|
91
|
0.7405
|
69
|
156
|
0.2238
|
|
34
|
93
|
0.7140
|
70
|
158
|
0.2171
|
|
35
|
95
|
0.6885
|
|
|
|
CURVE "B"
(0-70
in 1°C
increments)
| Temperature
|
Resistance
|
Temperature
|
Resistance |
|
°C |
°F |
Ratio
(R/R25) |
°C |
°F
|
Ratio
(R/R25) |
|
0
|
32
|
3.2657
|
36
|
97
|
0.6268
|
|
1
|
34
|
3.1036
|
37
|
99
|
0.6016
|
|
2
|
36
|
2.9505
|
38
|
100
|
0.5776
|
|
3
|
37
|
2.8058
|
39
|
102
|
0.5546
|
|
4
|
39
|
2.6690
|
40
|
104
|
0.5327
|
|
5
|
41
|
2.5396
|
41
|
106
|
0.5117
|
|
6
|
43
|
2.4174
|
42
|
108
|
0.4918
|
|
7
|
45
|
2.3018
|
43
|
109
|
0.4726
|
|
8
|
46
|
2.1922
|
44
|
111
|
0.4543
|
|
9
|
48
|
2.0886
|
45
|
113
|
0.4369
|
|
10
|
50
|
1.9904
|
46
|
115
|
0.4201
|
|
11
|
52
|
1.8974
|
47
|
117
|
0.4041
|
|
12
|
54
|
1.8093
|
48
|
118
|
0.3889
|
|
13
|
55
|
1.7258
|
49
|
120
|
0.3742
|
|
14
|
57
|
1.6465
|
50
|
122
|
0.3602
|
|
15
|
59
|
1.5715
|
51
|
124
|
0.3467
|
|
16
|
61
|
1.5003
|
52
|
126
|
0.3340
|
|
17
|
63
|
1.4327
|
53
|
127
|
0.3217
|
|
18
|
64
|
1.3684
|
54
|
129
|
0.3099
|
|
19
|
66
|
1.3074
|
55
|
131
|
0.2986
|
|
20
|
68
|
1.2495
|
56
|
133
|
0.2878
|
|
21
|
70
|
1.1944
|
57
|
135
|
0.2774
|
|
22
|
72
|
1.1421
|
58
|
136
|
0.2675
|
|
23
|
73
|
1.0923
|
59
|
138
|
0.2580
|
|
24
|
75
|
1.0451
|
60
|
140
|
0.2488
|
|
25
|
77
|
1.0000
|
61
|
142
|
0.2400
|
|
26
|
79
|
0.9573
|
62
|
144
|
0.2316
|
|
27
|
81
|
0.9166
|
63
|
145
|
0.2235
|
|
28
|
82
|
0.8778
|
64
|
147
|
0.2157
|
|
29
|
84
|
0.8409
|
65
|
149
|
0.2083
|
|
30
|
86
|
0.8057
|
66
|
151
|
0.2011
|
|
31
|
88
|
0.7722
|
67
|
153
|
0.1941
|
|
32
|
90
|
0.7403
|
68
|
154
|
0.1876
|
|
33
|
91
|
0.7099
|
69
|
156
|
0.1813
|
|
34
|
93
|
0.6809
|
70
|
158
|
0.1752
|
|
35
|
95
|
0.6532
|
|
|
|
|
