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Chip NTC Thermistor Nanjing Shiheng Elec CMFX 503F3950 Temperature Sensor for

China Chip NTC Thermistor Nanjing Shiheng Elec CMFX 503F3950 Temperature Sensor for

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Chip NTC Thermistor Nanjing Shiheng Elec CMFX 503F3950 Temperature Sensor for

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Resistance @ 25℃	50kΩ
Power(Watts)	100mW
Operating Temperature	-40℃~+125℃
Tolerance	±1%
Steady State Current (Max)	130uA
Thermal Time Constant	3s
B Constant (25℃/85℃)	4010K
B Constant (25℃/50℃)	3950K
B Constant Tolerance	±1%
Description	50kΩ 100mW ±1% 130uA 3950K ±1% 0402 NTC Thermistors RoHS
Mfr. Part #	CMFX 503F3950
Package	0402
Model Number	CMFX 503F3950

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Product Details
Company Details

Product Specification


Resistance @ 25℃	50kΩ	Power(Watts)	100mW
Operating Temperature	-40℃~+125℃	Tolerance	±1%
Steady State Current (Max)	130uA	Thermal Time Constant	3s
B Constant (25℃/85℃)	4010K	B Constant (25℃/50℃)	3950K
B Constant Tolerance	±1%	Description	50kΩ 100mW ±1% 130uA 3950K ±1% 0402 NTC Thermistors RoHS
Mfr. Part #	CMFX 503F3950	Package	0402
Model Number	CMFX 503F3950

NTC Thermistors

Product Overview
This document outlines the specifications for the CMF series Chip NTC Thermistors from Nanjing Shiheng Electronics Technology Co., Ltd. These thermistors are designed for various electronic applications requiring precise temperature sensing and control. Key features include a wide operating temperature range and reliable performance.

Product Attributes

Brand: Shiheng
Manufacturer: Nanjing Shiheng Electronics Technology Co., Ltd.
Origin: China
Product Type: Chip NTC Thermistor

Technical Specifications

Shape and Dimensions

Figure 1 & 2: Dimensions and Recommended PCB Pattern

Type	L (inch[mm])	W (inch[mm])	T (inch[mm])	a (inch[mm])	A (inch[mm])	B (inch[mm])	C (inch[mm])
[0402]	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 (Part Number)

CMF X 503 F 3950

Electrical Characteristics

Part No	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 Electric Power (25) (mW)	Operating Ambient Temperature ()
CMFX503F3950FB	501%	39501%	4010	0.13	1.0	<3	100	-40+125

Part Number Breakdown

Category Type: CMF (Chip NTC Thermistor)
External Dimensions (LWT): X [0402] 1.000.500.50
Nominal Zero-Power Resistance at 25: 503 (50k)
Tolerance of Resistance: F (1%)
B Constant: 3950 (3950K)
Tolerance of B Constant: F (1%)
B Constant Calculation Method: B (25 & 50)

Test Conditions

Standard Atmospheric Conditions: Ambient Temperature: 2015; Relative Humidity: 6520%; Air Pressure: 86 kPa~106 kPa.
Alternative Conditions (for disputed results): Ambient Temperature: 252; Relative Humidity: 655%; Air Pressure: 86 kPa~106 kPa.

Inspection Equipment

Visual Examination: 20 magnifier
Resistance Value Test: Thermistor resistance tester

Electrical Test Items

Nominal Zero-Power Resistance at 25 (R25)
Nominal B Constant (Calculated using resistance at different temperatures)
Thermal Time Constant
Dissipation Factor
Rated Power
Permissible Operating Current

Reliability Test

Item	Standard	Requirements
Terminal Strength	IEC 60068-2-21	No removal or split of the termination or other defects shall occur. No visible damage. \|R25/R25\| 2%
Flexure Resistance	IEC 60068-2-21	No visible damage. \|R25/R25\| 2%
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/R25\| 2%; \|B/B\| 1%
Temperature Cycling	IEC 60068-2-14	No visible damage. \|R25/R25\| 2%; \|B/B\| 1%
Resistance to Dry Heat	IEC 60068-2-2	No visible damage. \|R25/R25\| 2%; \|B/B\| 1%
Resistance to Cold	IEC 60068-2-1	No visible damage. \|R25/R25\| 2%; \|B/B\| 1%
Resistance to Damp Heat	IEC 60068-2-78	No visible damage. \|R25/R25\| 2%; \|B/B\| 1%
Resistance to High Temperature Load	IEC 60539-1 5.25.4	No visible damage. \|R25/R25\| 2%; \|B/B\| 1%

Taping

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
Conditions to Avoid: Dust, corrosive atmosphere, direct sunlight.
Period of Storage: 6 Months after delivery

Notes & Warnings

Do not operate or store under corrosive, deoxidized, volatile, inflammable, dusty, high/low pressure, humid conditions, or in places with brine, oil, chemical liquid, 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: 150~170/9030 sec. Time above 240: 20~40 sec. Peak temperature: 260Max./10 sec. Solder paste: 96.5Sn/3.0Ag/0.5Cu. Max. 2 times for re-flowing.
Iron Soldering Profile: Iron soldering power: Max.20W. Pre-heating: 150/60sec. Soldering Tip temperature: 280Max. Soldering time: 3 sec Max. Solder paste: 96.5Sn/3.0Ag/0.5Cu. Max. 1 time for iron soldering. (Note: Do not apply the tip of the soldering iron to the terminal electrodes.)

R-T Table (CMFXX503F3950FB)

Temp. ()	R_Min (Kohm)	R_Cent (Kohm)	R_Max (Kohm)	Res TOL.	Temp. TOL.()
-40	1,542.135	1,612.772	1,686.477	4.57%	0.67
-39	1,446.393	1,511.666	1,579.727	4.50%	0.66
-38	1,357.159	1,417.493	1,480.362	4.44%	0.66
-37	1,273.956	1,329.741	1,387.831	4.37%	0.65
-36	1,196.343	1,247.937	1,301.626	4.30%	0.65
-35	1,123.913	1,171.644	1,221.280	4.24%	0.64
-34	1,056.293	1,100.462	1,146.364	4.17%	0.64
-33	993.136	1,034.020	1,076.480	4.11%	0.63
-32	934.124	971.977	1,011.264	4.04%	0.63
-31	878.962	914.018	950.377	3.98%	0.62
-30	827.379	859.852	893.510	3.91%	0.62
-29	779.122	809.210	840.375	3.85%	0.61
-28	733.959	761.843	790.708	3.79%	0.61
-27	691.675	717.523	744.262	3.73%	0.60
-26	652.072	676.037	700.812	3.66%	0.59
-25	614.964	637.188	660.149	3.60%	0.59
-24	580.182	600.795	622.079	3.54%	0.58
-23	547.566	566.689	586.422	3.48%	0.58
-22	516.971	534.715	553.013	3.42%	0.57
-21	488.260	504.727	521.698	3.36%	0.57
-20	461.308	476.593	492.335	3.30%	0.56
-19	435.997	450.186	464.791	3.24%	0.55
-18	412.219	425.393	438.945	3.19%	0.55
-17	389.872	402.106	414.683	3.13%	0.54
-16	368.864	380.226	391.899	3.07%	0.54
-15	349.106	359.660	370.495	3.01%	0.53
-14	330.518	340.322	350.381	2.96%	0.52
-13	313.025	322.132	331.472	2.90%	0.52
-12	296.556	305.017	313.689	2.84%	0.51
-11	281.045	288.908	296.960	2.79%	0.50
-10	266.433	273.739	281.217	2.73%	0.50
-9	252.662	259.452	266.397	2.68%	0.49
-8	239.680	245.989	252.439	2.62%	0.48
-7	227.437	233.301	239.291	2.57%	0.48
-6	215.888	221.337	226.901	2.51%	0.47
-5	204.989	210.053	215.220	2.46%	0.46
-4	194.700	199.406	204.206	2.41%	0.46
-3	184.985	189.358	193.816	2.35%	0.45
-2	175.808	179.872	184.011	2.30%	0.44
-1	167.137	170.913	174.757	2.25%	0.43
0	158.941	162.449	166.019	2.20%	0.43
1	151.192	154.451	157.765	2.15%	0.42
2	143.863	146.891	149.967	2.09%	0.41
3	136.929	139.741	142.597	2.04%	0.41
4	130.368	132.979	135.629	1.99%	0.40
5	124.156	126.580	129.039	1.94%	0.39
6	118.274	120.524	122.805	1.89%	0.38
7	112.702	114.791	116.906	1.84%	0.38
8	107.424	109.361	111.323	1.79%	0.37
9	102.420	104.218	106.036	1.74%	0.36
10	97.677	99.343	101.028	1.70%	0.35
11	93.179	94.723	96.284	1.65%	0.34
12	88.912	90.343	91.788	1.60%	0.34
13	84.863	86.189	87.526	1.55%	0.33
14	81.021	82.247	83.484	1.50%	0.32
15	77.372	78.507	79.651	1.46%	0.31
16	73.908	74.957	76.014	1.41%	0.30
17	70.617	71.586	72.562	1.36%	0.30
18	67.490	68.385	69.286	1.32%	0.29
19	64.517	65.344	66.174	1.27%	0.28
20	61.692	62.454	63.219	1.22%	0.27
21	59.005	59.707	60.411	1.18%	0.26
22	56.449	57.095	57.742	1.13%	0.25
23	54.017	54.611	55.206	1.09%	0.25
24	51.703	52.248	52.794	1.04%	0.24
25	49.500	50.000	50.500	1.00%	0.23
26	47.361	47.860	48.360	1.04%	0.24
27	45.325	45.823	46.322	1.09%	0.25
28	43.388	43.883	44.380	1.13%	0.26
29	41.543	42.035	42.529	1.18%	0.27
30	39.786	40.275	40.766	1.22%	0.29
31	38.113	38.597	39.084	1.26%	0.30
32	36.518	36.998	37.481	1.30%	0.31
33	34.999	35.474	35.952	1.35%	0.32
34	33.550	34.020	34.492	1.39%	0.33
35	32.169	32.633	33.100	1.43%	0.35
36	30.851	31.309	31.771	1.47%	0.36
37	29.595	30.046	30.502	1.52%	0.37
38	28.395	28.841	29.290	1.56%	0.38
39	27.251	27.689	28.132	1.60%	0.40
40	26.158	26.590	27.026	1.64%	0.41
41	25.115	25.540	25.969	1.68%	0.42
42	24.119	24.536	24.959	1.72%	0.43
43	23.167	23.577	23.993	1.76%	0.45
44	22.257	22.661	23.069	1.80%	0.46
45	21.388	21.784	22.186	1.84%	0.47
46	20.557	20.946	21.340	1.88%	0.49
47	19.762	20.144	20.532	1.92%	0.50
48	19.002	19.377	19.757	1.96%	0.51
49	18.276	18.643	19.016	2.00%	0.53
50	17.580	17.941	18.307	2.04%	0.54
51	16.914	17.268	17.627	2.08%	0.55
52	16.277	16.624	16.976	2.12%	0.57
53	15.667	16.007	16.352	2.16%	0.58
54	15.083	15.416	15.754	2.20%	0.59
55	14.524	14.850	15.181	2.23%	0.61
56	13.988	14.307	14.632	2.27%	0.62
57	13.474	13.787	14.105	2.31%	0.64
58	12.982	13.288	13.600	2.35%	0.65
59	12.510	12.809	13.115	2.38%	0.66
60	12.057	12.351	12.650	2.42%	0.68
61	11.623	11.911	12.203	2.46%	0.69
62	11.207	11.488	11.775	2.50%	0.71
63	10.808	11.083	11.364	2.53%	0.72
64	10.425	10.694	10.969	2.57%	0.73
65	10.057	10.320	10.589	2.61%	0.75
66	9.704	9.962	10.225	2.64%	0.76
67	9.365	9.617	9.875	2.68%	0.78
68	9.040	9.286	9.538	2.71%	0.79
69	8.727	8.968	9.215	2.75%	0.81
70	8.427	8.663	8.904	2.79%	0.82
71	8.138	8.369	8.605	2.82%	0.84
72	7.861	8.086	8.317	2.86%	0.85
73	7.594	7.815	8.041	2.89%	0.87
74	7.338	7.554	7.775	2.93%	0.88
75	7.092	7.303	7.519	2.96%	0.90
76	6.855	7.061	7.273	3.00%	0.91
77	6.627	6.828	7.035	3.03%	0.93
78	6.408	6.605	6.807	3.07%	0.95
79	6.197	6.389	6.587	3.10%	0.96
80	5.994	6.182	6.376	3.13%	0.98
81	5.798	5.982	6.172	3.17%	0.99
82	5.610	5.790	5.975	3.20%	1.01
83	5.429	5.605	5.786	3.23%	1.02
84	5.254	5.426	5.604	3.27%	1.04
85	5.086	5.254	5.428	3.30%	1.06
86	4.924	5.089	5.258	3.33%	1.07
87	4.768	4.929	5.095	3.37%	1.09
88	4.618	4.775	4.937	3.40%	1.10
89	4.473	4.627	4.785	3.43%	1.12
90	4.333	4.483	4.639	3.47%	1.14
91	4.198	4.345	4.497	3.50%	1.15
92	4.068	4.212	4.361	3.53%	1.17
93	3.943	4.084	4.229	3.56%	1.19
94	3.822	3.960	4.102	3.59%	1.20
95	3.705	3.840	3.979	3.63%	1.22
96	3.593	3.724	3.861	3.66%	1.24
97	3.484	3.613	3.746	3.69%	1.25
98	3.379	3.505	3.636	3.72%	1.27
99	3.278	3.401	3.529	3.75%	1.29
100	3.180	3.301	3.426	3.78%	1.31
101	3.086	3.204	3.326	3.81%	1.32
102	2.994	3.110	3.229	3.84%	1.34
103	2.906	3.019	3.136	3.88%	1.36
104	2.821	2.932	3.046	3.91%	1.38
105	2.739	2.847	2.959	3.94%	1.39
106	2.660	2.765	2.875	3.97%	1.41
107	2.583	2.686	2.794	4.00%	1.43
108	2.509	2.610	2.715	4.03%	1.45
109	2.437	2.536	2.639	4.06%	1.46
110	2.367	2.464	2.565	4.09%	1.48
111	2.300	2.395	2.494	4.12%	1.50
112	2.235	2.328	2.425	4.15%	1.52
113	2.172	2.263	2.358	4.18%	1.54
114	2.112	2.201	2.293	4.20%	1.56
115	2.053	2.140	2.230	4.23%	1.57
116	1.996	2.081	2.170	4.26%	1.59
117	1.941	2.024	2.111	4.29%	1.61
118	1.887	1.969	2.054	4.32%	1.63
119	1.836	1.916	1.999	4.35%	1.65
120	1.786	1.864	1.946	4.38%	1.67
121	1.737	1.814	1.894	4.41%	1.69
122	1.690	1.765	1.844	4.43%	1.70
123	1.645	1.718	1.795	4.46%	1.72
124	1.601	1.673	1.748	4.49%	1.74
125	1.558	1.629	1.702	4.52%	1.76

2410121438_Nanjing-Shiheng-Elec-CMFX-503F3950_C2889042.pdf

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