
TFPT
Vishay
Linear PTC Thermistors, Surface Mount Chip
www.vishay.com
8
For technical questions, contact: thermistor1@vishay.com
document number: 33017
Revision: 25-Oct-06
Ratio Tolerance Examples:
At 40 °C, Ratio = 1.063 ± 0.5 % (0.005)
so, Ratio = 1.058 to 1.068
At 125 °C, Ratio = 1.460 ± 3 % (0.044)
so, Ratio = 1.416 to 1.504
AVERAGE T.C.S TFPT ALL SIZES & VALUES
TEMP
RATIO
- 55
0.698
- 54
0.701
- 53
0.705
- 52
0.708
- 51
0.712
- 50
0.715
- 49
0.719
- 48
0.722
- 47
0.726
- 46
0.729
- 45
0.733
- 44
0.736
- 43
0.740
- 42
0.743
- 41
0.747
- 40
0.750
- 39
0.754
- 38
0.757
- 37
0.761
- 36
0.765
- 35
0.768
- 34
0.772
- 33
0.775
- 32
0.779
- 31
0.783
- 30
0.786
- 29
0.790
- 28
0.794
- 27
0.797
- 26
0.801
- 25
0.805
- 24
0.808
- 23
0.812
- 22
0.816
- 21
0.820
- 20
0.823
- 19
0.827
- 18
0.831
- 17
0.834
- 16
0.838
- 15
0.842
- 14
0.846
- 13
0.850
- 12
0.853
- 11
0.857
TEMP
- 10
- 9
- 8
- 7
- 6
- 5
- 4
- 3
- 2
- 1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
RATIO
0.861
0.865
0.869
0.873
0.876
0.880
0.884
0.888
0.892
0.896
0.900
0.904
0.908
0.911
0.915
0.919
0.923
0.927
0.931
0.935
0.939
0.943
0.947
0.951
0.955
0.959
0.963
0.967
0.971
0.975
0.980
0.984
0.988
0.992
0.996
1.000
1.004
1.008
1.012
1.017
1.021
1.025
1.029
1.033
1.037
TEMP
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
RATIO
1.042
1.046
1.050
1.054
1.058
1.063
1.067
1.071
1.075
1.080
1.084
1.088
1.092
1.097
1.101
1.105
1.110
1.114
1.118
1.123
1.127
1.131
1.136
1.140
1.145
1.149
1.153
1.158
1.162
1.167
1.171
1.176
1.180
1.185
1.189
1.194
1.198
1.203
1.208
1.212
1.217
1.221
1.226
1.230
1.235
TEMP
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
RATIO
1.240
1.244
1.249
1.254
1.258
1.263
1.268
1.272
1.277
1.282
1.287
1.291
1.296
1.301
1.306
1.311
1.315
1.320
1.325
1.330
1.335
1.340
1.345
1.349
1.354
1.359
1.364
1.369
1.374
1.379
1.384
1.389
1.394
1.399
1.404
1.409
1.414
1.419
1.424
1.429
1.434
1.439
1.444
1.450
1.455
1.460
RATIO TOLERANCES
LOW TEMPERATURE HIGH TEMPERATURE
- 55 °C
- 40 °C
- 20 °C
0 °C
+ 12 °C
TOLERANCE
± 4 %
± 3 %
± 2 %
± 1 %
± 0.5 %
+ 125 °C
+ 85 °C
+ 55 °C
+ 40 °C