Model: mf52e-3
r25:47kω
B Value: 3950
The NTC is the abbreviation for negative temperature coefficient, which means a negative temperature system.
Empirical formula for resistance value and temperature conversion of thermistor in negative temperature system:
RT = RN * EXP (B * (1/T–1/TN))
RT: NTC thermistor resistance at temperature T (K).
RN: NTC thermistor resistance at rated temperature TN (K).
T: The specified temperature. T + 273.15
The material constant of the B:NTC thermistor, also known as the Thermosensitive index.
Exp: the index (e = 2.71828) with natural number e as the base. )。
tn:25 + 273.15 = 298.15
The equation is an empirical formula, only in the limited range of the rated temperature TN or the rated resistor resistance RN, because the material constant B itself is also a function of the temperature T.
Material constant (thermosensitive index) B value (K)
The B value is defined as:
B = ((T1*T1)/(T2-T1)) * LN (RT1/RT2)
RT1: The 0 Power resistance value when the temperature T1 (K).
RT2: The 0 Power resistance value when the temperature T2 (K).
T1, T2: Two specified temperatures (K).
For the commonly used NTC thermistor, the B value range is generally between 2000K ~ 6000K.