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Murata TDK Epcos Semitec NTC Power Thermistor MF73

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Murata TDK Epcos Semitec NTC Power Thermistor MF73

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Brand Name :	AMPFORT
Model Number :	MF73
Certification :	ROHS
Price :	Price is different for different model
Payment Terms :	T/T, Western Union
Supply Ability :	10,000pcs per week
Delivery Time :	10 workdays

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Murata TDK Epcos Semitec NTC Power Thermistor MF73

High Temperature Thinking Murata TDK Epcos Semitec Power Thermistor NTC Replacement MF73

Application Of The Power Thermistor NTC Replacement MF73

Various high-power switching power supplies, UPS power supplies, and conversion power supplies.
Electric car chargers, charging piles.
Motor drive device, high-power servo motor drive, logic controller.
High-power plasma welding machine, cutting machine, high-power lighting lamps.
Nuclear magnetic resonance equipment, high-power audio power amplifier, high-power toroidal transformer.
Solar panel array of high-capacity power inverter.
Industrial robots driven by high-voltage power supplies, low-voltage smart electrical cabinets.

Features Of The Power Thermistor NTC Replacement MF73

● Reliable structure and easy installation.

● Strong ability to suppress surge current and high energy absorption.

● The working steady-state current is large.

● Long life and high reliability.

Dimensions Of The Power Thermistor NTC Replacement MF73 (mm)

Curved

Body size	Φ40	Φ45	Φ50
Diameter(Dmax)	45	50	55
Thickness(Imax)	18	18	18
Pitch(F±15)	22.5	22.5	22.5
Lead length(L2)	20	20	20
Lead width(W±02	8	8	8
Lead thickness(H±0.1)	1.0	1.0	1.0

Straight

Body size	Φ40	Φ45	Φ50
Diameter(Dmax)	45	50	55
Thickness(Tmax)	18	18	18
Pitch(F±15)	22.5	22.5	22.5
Lead length(L±2)	30	30	30
Lead width(W±0.2)	10	10	10
Lead thickness(H±0.1)	1	1	1
Width of lowlead(W1±0.2)	6	6	6

Main Technical Parameters Of The Power Thermistor NTC Replacement MF73

Body diameter Φ40mm

P/N	R25 ±20% (Ω)	Thermal sensitive index B±10% (K)	Max steady state current Imax (A)	Approx R of Max current Rmax (Ω)	Max power dissipation Pmax (W)	Thermal time constant (mW/C)	Thermal time constant (s)	Max impulse capacitance (uF) 240VAC
MF73-0.2/50	0.2	2600	50	0.007	25	≥55	≤350	8000
MF73-0.5/40	0.5	2600	40	0.008				6800
MF73-1/40	1	2600	40	0.010				6800
MF73-1.5/36	1.5	2600	36	0.012				6800
MF73-2/32	2	2600	32	0.014				6800
MF73-2.5/30	2.5	2800	30	0.018				6800
MF73-3/28	3	2800	28	0.02				6800
MF73-4/27	4	2800	27	0.022				4700
MF73-4.7/26	4.7	3000	26	0.023				4700
MF73-5/25	5	3000	25	0.028				4700
MF73-6.8/23	6.8	3000	23	0.03				4700
MF73-8/20	8	3200	20	0.034				3300
MF73-10/19	10	3200	19	0.038				3300
MF73-12/18	12	3200	18	0.04				3300
MF73-15/16	15	3200	16	0.05				3300
MF73-18/14	18	3200	14	0.062				3300
MF73-20/13	20	3200	13	0.075				3300

Body diameter Φ45mm

P/N	R25 ±20% (Ω)	Thermal sensitive index B±10% (K)	Max steady state current Imax (A)	Approx R of Max current Rmax (Ω)	Max power dissipation Pmax (W)	Thermal time constant (mW/C)	Thermal time constant (s)	Max impulse capacitance (uF) 240VAC
MF73-0.2/65	0.2	2600	65	0.004	30	≥70	≤480	11500
MF73-0.5/50	0.5	2600	50	0.007				8000
MF73-1/48	1	2600	48	0.009				8000
MF73-1.5/45	1.5	2600	45	0.011				8000
MF73-2/40	2	2600	40	0.012				8000
MF73-2.5/37	2.5	2600	37	0.015				8000
MF73-3/35	3	2600	35	0.018				8000
MF73-4/34	4	2600	34	0.020				6800
MF73-4.7/32	4.7	2600	32	0.022				6800
MF73-5/30	5	3000	30	0.025				6800
MF73-6.8/28	6.8	3000	28	0.028				6800
MF73-8/26	8	3200	26	0.03				4700
MF73-10/24	10	3200	24	0.032				4700
MF73-12/22	12	3200	22	0.034				4700
MF73-15/20	15	3200	20	0.042				4700
MF73-18/18	18	3200	18	0.061				4700
MF73-20/16	20	3200	16	0.07				4700

Body diameter Φ50mm

P/N	R25 ±20% (Ω)	Thermal sensitive index B±10% (K)	Max steady state current Imax (A)	Approx R of Max current Rmax (Ω)	Max power dissipation Pmax (W)	Thermal time constant (mW/C)	Thermal time constant (s)	Max impulse capacitance (uF) 240VAC
MF73-0.2/80	0.2	2600	80	0.003	36	≥90	≤650	15000
MF73-0.5/60	0.5	2600	60	0.006				11500
MF73-1/56	1	2600	56	0.008				11500
MF73-1.5/50	1.5	2600	50	0.01				11500
MF73-2/45	2	2600	45	0.012				11500
MF73-2.5/42	2.5	2800	42	0.011				11500
MF73-3/40	3	2800	40	0.015				11500
MF73-4/38	4	2800	38	0.018				8000
MF73-4.7/36	4.7	3000	36	0.021				9000
MF73-5/35	5	3000	35	0.022				8000
MF73-6.8/32	6.8	3000	32	0.025				8000
MF73-8/29	8	3200	29	0.025				6800
MF73-10/27	10	3200	27	0.03				6800
MF73-12/25	12	3200	25	0.033				6800
MF73-15/23	15	3200	25	0.04				6800
MF73-18/20	18	3200	20	0.055				6800
MF73-20/18	20	3200	18	0.065				6800
MF73-25/15	25	3200	15	0.085				6800

Note: Unless the particular indication, allowable tolerance of R25 is ±20%.

Why need so big ntc thermistor ?

Inrush current is the momentary surge of current created when power is turned on to motors,transformers,power suppliers and heating elements. The more power required by industrial equipment,the larger the inrush current. It can effectively quench the inrush current by means of in series with power NTC thermistor in return circuit of power supply. The thermistor’s resistance decreases dramatically following the inrush,allowing the steady state curent to flow with very little resistance.This effect provides inrush current protection, yet allows efficiency during normal operation.The power NTC Thermistor produced by Dongguan Ampfort Electronics Co.,Ltd. with large scale,especially MF73T,MF73,MF74,MF75 serial products with big size,which can be applied in such inrush protection with industrial level as industrial robots and automation.

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