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quality Compact chip NTC thermistor Nanjing Shiheng Elec CMFX 103F3950 precise temperature sensing component factory
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quality Compact chip NTC thermistor Nanjing Shiheng Elec CMFX 103F3950 precise temperature sensing component factory
>
Specifications
Resistance @ 25℃:
10kΩ
Power(Watts):
100mW
Operating Temperature:
-40℃~+125℃
Tolerance:
±1%
B Constant (25℃/100℃):
-
Steady State Current (Max):
310uA
Thermal Time Constant:
3s
B Constant (25℃/85℃):
3950K
B Constant (25℃/75℃):
-
B Constant Tolerance:
-
B Constant (25℃/50℃):
3900K
Mfr. Part #:
CMFX 103F3950
Package:
0402
Key Attributes
Model Number: CMFX 103F3950
Product Description

Product Overview

The CMF X 103F3950 is a chip NTC thermistor manufactured by Nanjing Shiheng Electronics Technology Co., Ltd. This thermistor is designed for applications requiring precise temperature sensing and control. Its compact size and reliable performance make it suitable for various electronic circuits.

Product Attributes

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

Technical Specifications

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 () Dimensions (LW) Tolerance of Resistance
CMFX103F3950 10 3900 3950 0.31 1.0 <3 100 -40+125 0402 [1005] (1.00.5 mm) F (1%)

Dimensions (Fig.1 & Table 1)

Type L (inch[mm]) W (inch[mm]) T (inch[mm]) a (inch[mm]) A (inch[mm]) B (inch[mm]) C (inch[mm])
0402 [1005] 0.0390.006 [1.00.15] 0.0200.006 [0.50.15] 0.0200.006 [0.50.15] 0.0100.004 [0.250.1] [0.45-0.55] [0.4-0.5] [0.45-0.55]

Product Identification Breakdown

  • Type: CMF (Chip NTC Thermistor)
  • External Dimensions (LW): X [0402] (1.00.5 mm)
  • 25 Zero-Power Resistance: 103 (10k)
  • Tolerance of Resistance: F (1%)
  • B Constant: 3950 (3950K)

Test Conditions

Unless otherwise specified, standard atmospheric conditions for measurement/test are:

  • Ambient Temperature: 2015
  • Relative Humidity: 6520%
  • Air Pressure: 86 kPa to 106 kPa

If any doubt on the results, measurements/tests should be made within the following limits:

  • Ambient Temperature: 202
  • Relative Humidity: 655% RH
  • Air Pressure: 86 kPa to 106 kPa

Inspection Equipment

  • Visual Examination: 20 magnifier
  • Resistance value test: Thermistor resistance tester

Electrical Test Details

  • Nominal Zero-Power Resistance at 25 (R25): Ambient temperature: 250.2, Measuring electric power: 0.1mW
  • Nominal B Constant: Resistance measured at 250.2, 500.2 or 850.2. Formulae: B(25-50) = lnR25lnR50 / (1/T25 - 1/T50), B(25-85) = lnR25lnR85 / (1/T25 - 1/T85). T: Absolute temperature (K).
  • Thermal Time Constant: Time for temperature to change by 63.2% of the difference from ambient T0 to T1, expressed in seconds (S).
  • Dissipation Factor: Power required to raise thermistor body temperature by 1 in a specific ambient temperature, expressed in mW/. Formula: = W / (T - T0).
  • Rated Power: Power required to raise thermistor surface temperature by 100 at 25 ambient temperature.
  • Permissible Operating Current: Current that raises the body temperature of the chip NTC by 1C in still air due to self-heating.

Reliability Tests

Item Standard Requirements
Terminal Strength IEC 60068-2-21 No removal or split of the termination or other defects shall occur. (5N for 0201, 0402, 0603; 10N for 0805)
Resistance to Flexure IEC 60068-2-21 No visible damage. R25 variation: within 5%. (Flexure: 0201: 1mm; 0402, 0603, 0805: 2mm)
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. (Solder temp: 2455, Duration: 30.3s)
Resistance to Soldering Heat IEC 60068-2-58 No visible damage. R25 variation: within 3%. B constant variation: within 2%. (Solder temp: 2605, Duration: 101s)
Temperature Cycling IEC 60068-2-14 No visible damage. R25 variation: within 3%. B constant variation: within 2%. (5 cycles: -40 to 125)
Resistance to Dry Heat IEC 60068-2-2 No visible damage. R25 variation: within 5%. B constant variation: within 2%. (1255 for 100024 hours)
Resistance to Cold IEC 60068-2-1 No visible damage. R25 variation: within 5%. B constant variation: within 2%. (-403 for 100024 hours)
Resistance to Damp Heat IEC 60068-2-78 No visible damage. R25 variation: within 3%. B constant variation: within 2%. (402, 90-95% RH for 100024 hours)
Resistance to High Temperature Load IEC 60539-1 No visible damage. R25 variation: within 5%. B constant variation: within 2%. (852 with permissive operating current for 100048 hours)

Taping & Storage

Taping

Type Tape Thickness (mm) Tape Material Quantity per Reel
0201 0.50.15 Paper Tape 15K
0402 0.50.15 Paper Tape 10K
0603 0.80.15 Paper Tape 4K
0805 0.850.2 Paper Tape 4K

Storage Conditions

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

Notes & Warnings

  • Do not operate or store under corrosive or deoxidized atmospheres (e.g., chlorine, sulfurated hydrogen, ammonia, sulfuric acid, nitric oxide), volatile or inflammable atmospheres, dusty conditions, excessive high or low pressure, humid sites, places with brine, oil, chemical liquid or organic solvent, or intense vibration.
  • The ceramic body is fragile; avoid excessive pressure or impact.
  • Do not operate 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: 150/60sec.
  • 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

Temperature (C) R_Min (Kohm) R_Cent (Kohm) R_Max (Kohm) Res TOL. (%) Temp. TOL.(C)
-40 314.524 328.996 344.099 4.59% 0.67
-39 294.558 307.907 321.829 4.52% 0.66
-38 275.994 288.312 301.150 4.45% 0.66
-37 258.725 270.096 281.939 4.38% 0.65
-36 242.652 253.153 264.082 4.32% 0.65
-35 227.687 237.387 247.476 4.25% 0.64
-34 213.708 222.670 231.985 4.18% 0.64
-33 200.682 208.965 217.568 4.12% 0.63
-32 188.536 196.194 204.143 4.05% 0.63
-31 177.206 184.289 191.635 3.99% 0.62
-30 166.633 173.185 179.977 3.92% 0.62
-29 156.759 162.823 169.104 3.86% 0.61
-28 147.535 153.148 158.959 3.79% 0.61
-27 138.915 144.112 149.489 3.73% 0.60
-26 130.854 135.668 140.645 3.67% 0.59
-25 123.313 127.773 132.381 3.61% 0.59
-24 116.271 120.404 124.672 3.54% 0.58
-23 109.675 113.507 117.461 3.48% 0.58
-22 103.495 107.048 110.712 3.42% 0.57
-21 97.702 100.998 104.394 3.36% 0.57
-20 92.270 95.327 98.476 3.30% 0.56
-19 87.153 89.989 92.908 3.24% 0.55
-18 82.353 84.984 87.690 3.18% 0.55
-17 77.848 80.289 82.799 3.13% 0.54
-16 73.617 75.883 78.211 3.07% 0.54
-15 69.643 71.746 73.906 3.01% 0.53
-14 65.921 67.874 69.878 2.95% 0.52
-13 62.421 64.235 66.095 2.90% 0.52
-12 59.128 60.813 62.540 2.84% 0.51
-11 56.027 57.593 59.196 2.78% 0.50
-10 53.110 54.564 56.053 2.73% 0.50
-9 50.347 51.698 53.080 2.67% 0.49
-8 47.746 49.001 50.284 2.62% 0.48
-7 45.295 46.461 47.652 2.56% 0.48
-6 42.985 44.068 45.174 2.51% 0.47
-5 40.807 41.813 42.840 2.46% 0.46
-4 38.755 39.690 40.643 2.40% 0.46
-3 36.819 37.688 38.573 2.35% 0.45
-2 34.991 35.798 36.620 2.30% 0.44
-1 33.264 34.014 34.777 2.24% 0.44
0 31.633 32.330 33.039 2.19% 0.43
1 30.090 30.737 31.395 2.14% 0.42
2 28.632 29.233 29.844 2.09% 0.41
3 27.252 27.810 28.377 2.04% 0.41
4 25.948 26.466 26.992 1.99% 0.40
5 24.713 25.194 25.682 1.94% 0.39
6 23.544 23.991 24.444 1.89% 0.38
7 22.437 22.852 23.272 1.84% 0.38
8 21.389 21.774 22.164 1.79% 0.37
9 20.396 20.753 21.114 1.74% 0.36
10 19.454 19.785 20.120 1.69% 0.35
11 18.561 18.868 19.178 1.64% 0.35
12 17.715 17.999 18.286 1.60% 0.34
13 16.911 17.174 17.440 1.55% 0.33
14 16.149 16.393 16.639 1.50% 0.32
15 15.425 15.651 15.878 1.45% 0.31
16 14.738 14.947 15.157 1.41% 0.31
17 14.086 14.279 14.473 1.36% 0.30
18 13.466 13.644 13.823 1.31% 0.29
19 12.876 13.041 13.206 1.27% 0.28
20 12.316 12.468 12.620 1.22% 0.27
21 11.784 11.924 12.064 1.18% 0.26
22 11.277 11.406 11.535 1.13% 0.26
23 10.795 10.914 11.033 1.09% 0.25
24 10.337 10.446 10.555 1.04% 0.24
25 9.900 10.000 10.100 1.00% 0.23
26 9.476 9.576 9.676 1.04% 0.24
27 9.072 9.172 9.272 1.09% 0.25
28 8.689 8.788 8.887 1.13% 0.27
29 8.322 8.421 8.520 1.17% 0.28
30 7.974 8.072 8.170 1.22% 0.29
31 7.643 7.740 7.837 1.26% 0.30
32 7.326 7.422 7.519 1.30% 0.31
33 7.025 7.120 7.216 1.34% 0.32
34 6.737 6.831 6.926 1.39% 0.34
35 6.463 6.556 6.650 1.43% 0.35
36 6.201 6.293 6.385 1.47% 0.36
37 5.953 6.043 6.134 1.51% 0.37
38 5.714 5.803 5.893 1.55% 0.39
39 5.487 5.575 5.664 1.59% 0.40
40 5.269 5.356 5.443 1.63% 0.41
41 5.063 5.148 5.234 1.67% 0.42
42 4.864 4.948 5.033 1.71% 0.44
43 4.675 4.757 4.840 1.75% 0.45
44 4.494 4.575 4.657 1.79% 0.46
45 4.321 4.401 4.482 1.83% 0.48
46 4.156 4.234 4.313 1.87% 0.49
47 3.997 4.074 4.152 1.91% 0.50
48 3.846 3.921 3.997 1.95% 0.52
49 3.701 3.775 3.850 1.99% 0.53
50 3.562 3.635 3.709 2.03% 0.54
51 3.430 3.501 3.573 2.07% 0.56
52 3.303 3.373 3.444 2.10% 0.57
53 3.182 3.250 3.320 2.14% 0.58
54 3.065 3.132 3.200 2.18% 0.60
55 2.953 3.019 3.086 2.22% 0.61
56 2.847 2.911 2.977 2.25% 0.63
57 2.744 2.807 2.871 2.29% 0.64
58 2.646 2.708 2.771 2.33% 0.65
59 2.551 2.612 2.674 2.37% 0.67
60 2.462 2.521 2.582 2.40% 0.68
61 2.375 2.433 2.492 2.44% 0.70
62 2.291 2.348 2.406 2.47% 0.71
63 2.211 2.267 2.324 2.51% 0.72
64 2.135 2.190 2.246 2.55% 0.74
65 2.062 2.115 2.170 2.58% 0.75
66 1.991 2.043 2.096 2.62% 0.77
67 1.922 1.973 2.025 2.65% 0.78
68 1.857 1.907 1.958 2.69% 0.80
69 1.794 1.843 1.893 2.72% 0.81
70 1.733 1.781 1.830 2.76% 0.83
71 1.675 1.722 1.770 2.79% 0.84
72 1.620 1.666 1.713 2.83% 0.86
73 1.567 1.612 1.658 2.86% 0.87
74 1.515 1.559 1.604 2.89% 0.89
75 1.466 1.509 1.553 2.93% 0.90
76 1.419 1.461 1.504 2.96% 0.92
77 1.373 1.414 1.456 3.00% 0.94
78 1.329 1.369 1.410 3.03% 0.95
79 1.286 1.326 1.367 3.06% 0.97
80 1.245 1.284 1.324 3.09% 0.98
81 1.206 1.244 1.283 3.13% 1.00
82 1.168 1.205 1.243 3.16% 1.01
83 1.131 1.167 1.204 3.19% 1.03
84 1.096 1.131 1.167 3.23% 1.05
85 1.062 1.097 1.133 3.26% 1.06
86 1.029 1.063 1.098 3.29% 1.08
87 0.998 1.031 1.065 3.32% 1.09
88 0.967 1.000 1.034 3.35% 1.11
89 0.938 0.970 1.003 3.38% 1.13
90 0.910 0.941 0.973 3.42% 1.14
91 0.882 0.913 0.944 3.45% 1.16
92 0.856 0.886 0.917 3.48% 1.18
93 0.831 0.860 0.890 3.51% 1.19
94 0.805 0.834 0.864 3.54% 1.21
95 0.782 0.810 0.839 3.57% 1.23
96 0.760 0.787 0.815 3.60% 1.25
97 0.737 0.764 0.792 3.63% 1.26
98 0.716 0.742 0.769 3.66% 1.28
99 0.695 0.721 0.748 3.69% 1.30
100 0.676 0.701 0.727 3.72% 1.31
101 0.656 0.681 0.707 3.75% 1.33
102 0.638 0.662 0.687 3.78% 1.35
103 0.619 0.643 0.667 3.81% 1.37
104 0.602 0.625 0.649 3.84% 1.38
105 0.585 0.608 0.632 3.87% 1.40
106 0.569 0.591 0.614 3.90% 1.42
107 0.553 0.575 0.598 3.93% 1.44
108 0.538 0.559 0.581 3.96% 1.46
109 0.523 0.544 0.566 3.98% 1.47
110 0.510 0.530 0.551 4.01% 1.49
111 0.496 0.516 0.537 4.04% 1.51
112 0.482 0.502 0.522 4.07% 1.53
113 0.470 0.489 0.509 4.09% 1.55
114 0.457 0.476 0.496 4.12% 1.56
115 0.445 0.463 0.482 4.15% 1.58
116 0.433 0.451 0.470 4.18% 1.60
117 0.421 0.439 0.457 4.21% 1.62
118 0.411 0.428 0.446 4.23% 1.64
119 0.400 0.417 0.435 4.26% 1.66
120 0.389 0.406 0.423 4.29% 1.68
121 0.380 0.396 0.413 4.31% 1.70
122 0.370 0.386 0.403 4.34% 1.71
123 0.360 0.376 0.392 4.37% 1.73
124 0.352 0.367 0.383 4.39% 1.75
125 0.343 0.358 0.374 4.42% 1.77

2410121439_Nanjing-Shiheng-Elec-CMFX-103F3950_C2889041.pdf

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