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quality Chip NTC thermistor Nanjing Shiheng Elec CMFB 103F3950 for accurate temperature control applications factory
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quality Chip NTC thermistor Nanjing Shiheng Elec CMFB 103F3950 for accurate temperature control applications factory
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Specifications
Resistance @ 25℃:
10kΩ
Power(Watts):
100mW
Operating Temperature:
-40℃~+125℃
Tolerance:
±1%
B Constant (25℃/100℃):
-
Steady State Current (Max):
440uA
Thermal Time Constant:
5s
B Constant (25℃/85℃):
3987K
B Constant (25℃/75℃):
-
B Constant Tolerance:
-
B Constant (25℃/50℃):
3950K
Mfr. Part #:
CMFB 103F3950
Package:
0805
Key Attributes
Model Number: CMFB 103F3950
Product Description

Product Overview

The CMF series NTC thermistors, specifically the CMFB 103F3950 model from Nanjing Shiheng Electronics Technology Co., Ltd., are designed for precise temperature sensing and control applications. These chip NTC thermistors offer reliable performance across a wide operating temperature range of -40 to +125. They are suitable for various industrial and electronic applications requiring accurate resistance-temperature characteristics.

Product Attributes

  • Brand: Shiheng
  • Origin: Nanjing, China
  • Product Type: Chip NTC Thermistor

Technical Specifications

Category Type Dimensions (L x W) Part Number Resistance (25) (k) B Constant (25/50) (K) B Constant (25/85) (K) Permissible Operating Current (25) (mA) Dissipation Factor (mW/) Thermal Time Constant (s) Rated Power (25) (mW) Operating Ambient Temperature ()
CMF Series CMFB [0805] 2.00.2 [0.0790.008] x 1.250.2 [0.0490.008] CMFB 103F3950 10 3950 3987 0.44 1.0 <5 100 -40+125

Dimensions

Type L (inch[mm]) W (inch[mm]) T (inch[mm]) a (inch[mm]) A (inch[mm]) B (inch[mm]) C (inch[mm])
[0805] 0.0790.008 [2.00.2] 0.0490.008 [1.250.2] 0.0330.008 [0.850.2] 0.0200.012 [0.50.3] [1.0-1.1] [0.6-0.7] [1.0-1.2]

Product Identification Breakdown

  • CMF: Series
  • B: External Dimensions (0805)
  • 103: Nominal Resistance at 25 (10k)
  • F: Tolerance of Resistance (1%)
  • 3950: B Value Constant (3950K)

Test Conditions

Standard Atmospheric Conditions: Ambient Temperature: 2015; Relative Humidity: 6520%; Air Pressure: 86 kPa~106 kPa.

Conditions for Disputed Results: Ambient Temperature: 202; Relative Humidity: 655%RH; Air Pressure: 86 kPa ~ 106 kPa.

Reliability Test Summary

Test Item Standard Requirements
Terminal Strength IEC 60068-2-21 No removal or split of the termination or other defects shall occur.
Resistance to Flexure IEC 60068-2-21 No visible damage. R25 variation: within 5%.
Vibration IEC 60068-2-80 No visible damage.
Dropping IEC 60068-2-32 No visible damage.
Solderability IEC 60068-2-58 No visible damage. Wetting shall exceed 95% coverage.
Resistance to Soldering Heat IEC 60068-2-58 No visible damage. R25 variation: within 3%. B constant variation: within 2%.
Temperature Cycling IEC 60068-2-14 No visible damage. R25 variation: within 3%. B constant variation: within 2%.
Resistance to Dry Heat IEC 60068-2-2 No visible damage. R25 variation: within 5%. B constant variation: within 2%.
Resistance to Cold IEC 60068-2-1 No visible damage. R25 variation: within 5%. B constant variation: within 2%.
Resistance to Damp Heat IEC 60068-2-78 No visible damage. R25 variation: within 3%. B constant variation: within 2%.
Resistance to High Temperature Load IEC 60539-1 5.25.4 No visible damage. R25 variation: within 5%. B constant variation: within 2%.

Taping & Storage

Taping Specifications

Type Tape Thickness (mm) Tape Material Quantity per Reel
0201 0.50.15 Paper Tape 15K
X 0.50.15 Paper Tape 10K
A 0.80.15 Paper Tape 4K
B 0.850.2 Paper Tape 4K

Storage Conditions

  • Storage Temperature: -1040
  • Relative Humidity: 75%RH
  • Environment: Keep away from corrosive atmosphere, dust, and sunlight.
  • Period of Storage: 6 Months

Notes & Warnings

  • The CMF series thermistors shall not be operated and stored under corrosive or deoxidized atmospheres, volatile or inflammable atmospheres, dusty conditions, excessive high or low pressure, humid sites, places with brine, oil, chemical liquid or organic solvent, intense vibration, or analogously deleterious conditions.
  • The ceramic body of the CMF series thermistors is fragile; no excessive pressure or impact shall be exerted on it.
  • The CMF series thermistors shall not be operated beyond the specified Operating Temperature Range.

Recommended Soldering Technologies

Re-flowing Profile

  • Ramp: 1~2 /sec.
  • Pre-heating: 150~190/9030 sec.
  • Time above 240: 20~40 sec.
  • Peak temperature: 260 Max./10 sec.
  • Solder paste: Sn/3.0Ag/0.5Cu
  • Max. 2 times for re-flowing.

Iron Soldering Profile

  • Iron soldering power: Max.30W
  • Pre-heating: 150/60 sec.
  • Soldering Tip temperature: 350 Max.
  • Soldering time: 3 sec Max.
  • Solder paste: Sn/3.0Ag/0.5Cu
  • Max. 1 time for iron soldering.
  • Note: Take care not to apply the tip of the soldering iron to the terminal electrodes.

R-T Table (CMFBX103F3950FB)

Temperature () R Min (Kohm) R Center (Kohm) R Max (Kohm) Resistance TOL. Temperature TOL.()
-40 329.927 345.275 361.300 4.64% 0.67
-39 308.651 322.791 337.545 4.57% 0.66
-38 288.892 301.925 315.514 4.50% 0.66
-37 270.532 282.549 295.071 4.43% 0.65
-36 253.464 264.549 276.091 4.36% 0.65
-35 237.587 247.816 258.459 4.29% 0.64
-34 222.812 232.254 242.072 4.23% 0.64
-33 209.055 217.774 226.833 4.16% 0.63
-32 196.239 204.292 212.655 4.09% 0.63
-31 184.293 191.735 199.457 4.03% 0.62
-30 173.153 180.032 187.165 3.96% 0.61
-29 162.760 169.120 175.711 3.90% 0.61
-28 153.059 158.941 165.033 3.83% 0.60
-27 144.000 149.441 155.073 3.77% 0.60
-26 135.535 140.571 145.779 3.71% 0.59
-25 127.622 132.284 137.102 3.64% 0.59
-24 120.207 124.522 128.979 3.58% 0.58
-23 113.270 117.266 121.391 3.52% 0.58
-22 106.779 110.480 114.298 3.46% 0.57
-21 100.701 104.130 107.664 3.39% 0.56
-20 95.008 98.185 101.459 3.33% 0.56
-19 89.674 92.618 95.650 3.27% 0.55
-18 84.672 87.402 90.211 3.21% 0.55
-17 79.982 82.513 85.115 3.15% 0.54
-16 75.580 77.927 80.339 3.10% 0.53
-15 71.449 73.626 75.861 3.04% 0.53
-14 67.569 69.588 71.661 2.98% 0.52
-13 63.924 65.797 67.719 2.92% 0.51
-12 60.498 62.237 64.019 2.86% 0.51
-11 57.277 58.890 60.543 2.81% 0.50
-10 54.247 55.744 57.278 2.75% 0.49
-9 51.396 52.786 54.208 2.69% 0.49
-8 48.712 50.002 51.322 2.64% 0.48
-7 46.184 47.382 48.606 2.58% 0.47
-6 43.803 44.916 46.051 2.53% 0.47
-5 41.559 42.592 43.646 2.47% 0.46
-4 39.441 40.400 41.377 2.42% 0.45
-3 37.443 38.333 39.240 2.37% 0.45
-2 35.559 36.385 37.227 2.31% 0.44
-1 33.781 34.548 35.328 2.26% 0.43
0 32.102 32.814 33.538 2.21% 0.43
1 30.518 31.179 31.851 2.16% 0.42
2 29.022 29.636 30.259 2.10% 0.41
3 27.608 28.178 28.756 2.05% 0.40
4 26.271 26.800 27.336 2.00% 0.40
5 25.007 25.497 25.994 1.95% 0.39
6 23.808 24.263 24.724 1.90% 0.38
7 22.674 23.096 23.523 1.85% 0.37
8 21.601 21.992 22.387 1.80% 0.37
9 20.584 20.947 21.313 1.75% 0.36
10 19.622 19.958 20.297 1.70% 0.35
11 18.711 19.022 19.336 1.65% 0.34
12 17.847 18.135 18.425 1.60% 0.33
13 17.028 17.294 17.563 1.55% 0.33
14 16.251 16.498 16.746 1.51% 0.32
15 15.514 15.742 15.972 1.46% 0.31
16 14.814 15.025 15.237 1.41% 0.30
17 14.150 14.345 14.541 1.37% 0.29
18 13.519 13.699 13.880 1.32% 0.29
19 12.921 13.086 13.253 1.27% 0.28
20 12.351 12.504 12.657 1.23% 0.27
21 11.811 11.951 12.092 1.18% 0.26
22 11.296 11.426 11.555 1.13% 0.25
23 10.808 10.926 11.045 1.09% 0.24
24 10.342 10.452 10.561 1.04% 0.24
25 9.900 10.000 10.100 1.00% 0.23
26 9.471 9.570 9.670 1.04% 0.24
27 9.062 9.162 9.261 1.09% 0.25
28 8.673 8.773 8.872 1.13% 0.26
29 8.304 8.402 8.501 1.18% 0.27
30 7.952 8.049 8.147 1.22% 0.29
31 7.616 7.713 7.811 1.26% 0.30
32 7.297 7.393 7.490 1.31% 0.31
33 6.993 7.088 7.184 1.35% 0.32
34 6.703 6.797 6.892 1.39% 0.33
35 6.427 6.520 6.613 1.43% 0.35
36 6.164 6.255 6.348 1.47% 0.36
37 5.913 6.003 6.094 1.52% 0.37
38 5.673 5.762 5.852 1.56% 0.38
39 5.445 5.532 5.621 1.60% 0.40
40 5.226 5.313 5.400 1.64% 0.41
41 5.018 5.103 5.189 1.68% 0.42
42 4.819 4.903 4.987 1.72% 0.43
43 4.629 4.711 4.795 1.76% 0.45
44 4.448 4.529 4.610 1.80% 0.46
45 4.274 4.354 4.434 1.84% 0.47
46 4.109 4.187 4.266 1.88% 0.49
47 3.951 4.027 4.104 1.92% 0.50
48 3.799 3.874 3.950 1.96% 0.51
49 3.655 3.728 3.803 2.00% 0.53
50 3.516 3.588 3.661 2.04% 0.54
51 3.384 3.454 3.526 2.08% 0.55
52 3.257 3.326 3.396 2.12% 0.57
53 3.135 3.203 3.272 2.16% 0.58
54 3.019 3.086 3.153 2.19% 0.59
55 2.908 2.973 3.039 2.23% 0.61
56 2.801 2.865 2.930 2.27% 0.62
57 2.699 2.761 2.825 2.31% 0.64
58 2.601 2.662 2.724 2.35% 0.65
59 2.507 2.567 2.628 2.38% 0.66
60 2.417 2.476 2.535 2.42% 0.68
61 2.331 2.388 2.447 2.46% 0.69
62 2.248 2.304 2.362 2.49% 0.71
63 2.169 2.224 2.280 2.53% 0.72
64 2.092 2.146 2.201 2.57% 0.74
65 2.019 2.072 2.126 2.60% 0.75
66 1.949 2.001 2.053 2.64% 0.76
67 1.882 1.932 1.984 2.67% 0.78
68 1.817 1.866 1.917 2.71% 0.79
69 1.754 1.803 1.852 2.75% 0.81
70 1.695 1.742 1.790 2.78% 0.82
71 1.637 1.684 1.731 2.82% 0.84
72 1.582 1.628 1.674 2.85% 0.85
73 1.529 1.574 1.619 2.88% 0.87
74 1.479 1.522 1.566 2.92% 0.88
75 1.430 1.472 1.516 2.95% 0.90
76 1.383 1.424 1.467 2.99% 0.92
77 1.337 1.378 1.419 3.02% 0.93
78 1.294 1.333 1.374 3.06% 0.95
79 1.251 1.290 1.330 3.09% 0.96
80 1.211 1.249 1.288 3.12% 0.98
81 1.172 1.209 1.247 3.16% 0.99
82 1.135 1.171 1.208 3.19% 1.01
83 1.099 1.134 1.171 3.22% 1.03
84 1.064 1.099 1.135 3.26% 1.04
85 1.031 1.065 1.100 3.29% 1.06
86 0.998 1.032 1.066 3.32% 1.07
87 0.967 1.000 1.033 3.35% 1.09
88 0.937 0.969 1.002 3.38% 1.11
89 0.908 0.940 0.972 3.42% 1.12
90 0.881 0.911 0.943 3.45% 1.14
91 0.854 0.884 0.914 3.48% 1.16
92 0.828 0.857 0.887 3.51% 1.17
93 0.803 0.831 0.861 3.54% 1.19
94 0.779 0.807 0.835 3.57% 1.21
95 0.755 0.783 0.811 3.61% 1.22
96 0.733 0.760 0.787 3.64% 1.24
97 0.711 0.738 0.765 3.67% 1.26
98 0.691 0.716 0.743 3.70% 1.27
99 0.670 0.695 0.721 3.73% 1.29
100 0.651 0.675 0.701 3.76% 1.31
101 0.632 0.656 0.681 3.79% 1.33
102 0.614 0.637 0.662 3.82% 1.34
103 0.596 0.619 0.643 3.85% 1.36
104 0.579 0.602 0.625 3.88% 1.38
105 0.563 0.585 0.608 3.91% 1.40
106 0.547 0.569 0.591 3.94% 1.41
107 0.532 0.553 0.575 3.97% 1.43
108 0.517 0.538 0.559 4.00% 1.45
109 0.502 0.523 0.544 4.03% 1.47
110 0.489 0.508 0.529 4.05% 1.49
111 0.475 0.495 0.515 4.08% 1.50
112 0.462 0.481 0.501 4.11% 1.52
113 0.449 0.468 0.487 4.14% 1.54
114 0.437 0.456 0.474 4.17% 1.56
115 0.425 0.443 0.462 4.20% 1.58
116 0.414 0.432 0.450 4.22% 1.60
117 0.403 0.420 0.438 4.25% 1.62
118 0.392 0.409 0.427 4.28% 1.63
119 0.382 0.399 0.416 4.31% 1.65
120 0.372 0.388 0.405 4.34% 1.67
121 0.362 0.378 0.395 4.36% 1.69
122 0.353 0.368 0.385 4.39% 1.71
123 0.344 0.359 0.375 4.42% 1.73
124 0.335 0.350 0.365 4.44% 1.75
125 0.326 0.341 0.356 4.47% 1.77

2410121439_Nanjing-Shiheng-Elec-CMFB-103F3950_C2889057.pdf

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