Axial glass-encapsulated NTC thermistors are widely used in various temperature detection fields due to their simple manufacturing process and low cost. At present, the internal structure of most axial glass-encapsulated NTC thermistors on the market is formed by direct physical contact between the lead of the magnesium wire and the NTC chip. If the poor physical contact causes gaps to appear, and the thermal expansion coefficients of the glass and the Dumex wire are not the same, an open circuit may occur at high temperatures. At the same time, the practical application temperature of most axial glass sealed NTC thermistors on the market is -50 ℃ ~ 250 ℃, which can be widely used in the field of low and medium temperature detection. However, in the temperature range of 250 ℃ ~ 500 ℃, because of the potential open circuit of NTC thermistors, only metal platinum resistors can be used. However, the price of metal platinum resistors is expensive, which will increase the production cost.

A: Dimension drawings
 
 
B:Product Features:
1: MF58 series of products for the axial lead glass package type
2: good stability, high reliability
3: Wide resistance range: 1KΩ ~ 1000KΩ
4: resistance and B value of high precision
5: As a result of glass packaging,Can be used in high temperature and harsh environments
6: small size, rugged, easy to install automatically
7: Operating temperature range -40 ℃ ~ +300 ℃
8: Rated power: ≤ 50mW
9: thermal induction fast, high sensitivity

C：Product model description
MF   58  103    F   3950
①　 ②   ③    ④    ⑤　
①MF ¬ - negative temperature coefficient (NTC) thermistor code.
② 58 - glass package thermistor.
③103 - thermistor nominal resistance, said the resistance of the nominal resistance: 10 × 103 (Ω).
F = ± 1%, G = ± 2%, H = ± 3%, J = ± 5% of the resistance value (accuracy)
⑤ 3950 - resistance of the thermal index (material coefficient) B value: 395 × 10 (K)
  Note: According to customer requirements,Provide different R value, B value accuracy, customization.
        When measuring NTC thermistors, the following must be observed:
• Can not be measured in air, The temperature difference in the air is bigger, Measurement is not accurate, Resulting in accuracy bias.
• Measurement using a high-precision thermostat, NTC into the thermostat after the test tank, After the temperature of the thermostat is stable, Can be measured.
• Measure voltage as low as possible,To reduce NTC self-heating caused by measurement error.
• For high temperature measurements,The temperature of the bath needs to be corrected and checked with a thermometer.
F：MF58 Series Model and Specification

Model	Rated resistance value（R25）		B value	Operating temperature	Dissipation factor（mW/℃）	Thermal time constant（S）
	Resistance value （KΩ）	Tolerance （± %）	Nominal value （K）
MF58-202-3435	2	±1% ±2% ±3% ±5%	3435	-40℃  ~ +250℃	≥2.0 Still air	≤12 Still air
MF58-502-3470	5		3470
MF58-103-3435	10		3435
MF58-103-3600	10		3600
MF58-103-3700	10		3700
MF58-103-3950	10		3950
MF58-103-4100	10		4100
MF58-203-3950	20		3950
MF58-233-3950	23		3950
MF58-303-3950	30		3950
MF58-40.27-3979	40.27		3979
MF58-473-3950	47		3950
MF58-503-3950	50		3950
MF58-503-4050	50		4050
MF58-104-3899	100		3899
MF58-104-3950	100		3950
MF58-104-3990	100		3990
MF58-104-4050	100		4050
MF58-104-4200	100		4200
MF58-204-4260	200		4260	-40℃  ~ +300℃
MF58-504-4260	500		4260
MF58-504-4400	500		4400
MF58-105-4400	1000		4400

 
Commonly used MF58 glass seal NTC thermistor resistance and B value parameters

Resistance	B value
R25
400	3200
500R	3000
1K	3300	3470
1.8K	3460
2K	3470	3900
2.5K	3490
2.89K	3470
4.7K	3230	3540
5K	3470	3950	3600	3274	3350	3530
7.5K	3430
8.2K	3950
10K	3270	3380	3435	3470	3600	3740	3950	4080
11.78K R80	3550	3550
12K	3600
12.5K	3950
15K	3950	4100
20K	3950	4000	4160	4200
22K	3750	4200
22.5K	4200
30K	3850	3950
33K	3950
40K	3950
40.27K	3950
47K	3950
50K	3950	3990	4050
57.5K	3950
58.3K	3980
92K	3950
100K	3400	3900	3950	3990	4050	4100	4200	4360
104K	3460
105K	4200
107.1K	4220	4200
150K	3950	4300
192K	3860
200K	4420	3570	3899	3500	3520	4200
230K	4150	4370
238K	4200
250K	3950
455K	4120
470K	4370
500K	4050	4260	4300
520K	4050
530K	4080
533K	4090
540K	4090
542K	4110
545K	4083
548K	4110
583K	4140
1M	4200	4400
1.1M	4230
1.388M	4600
2.3M	4500