NTC Thermistor for surge suppression-MF72 10D11

NTC Thermistor for surge suppression-MF72 6D-20

A.NTC Thermistor for surge suppression-MF72-MF72 D7

NTC Thermistor for surge suppression-MF72-MF72 D20

A.NTC Thermistor for surge suppression-MF72-MF72 D9

MF72 NTC Thermistor for surge suppression

Key Features of MF72 Thermistor:
● Strong surge suppression.
● High B-value, low residual resistance .
● Comprehensive application, superior reliability.
● High power capacity, quick response, compact size.
● Minimal power loss, long Service Life.

Model Number

MF72 D5 series, D8 series, D10 series , D13 series , D15 series, D20 series

Brand

DXM

INQUIRY

Details

Introduction to MF72 NTC Thermistor for Surge Suppression

The NTC MF72 series Power Type NTC Thermistors are specifically designed for surge suppression, offering reliable protection for electronic equipment. This MF72 thermistor is made from specially formulated metal oxide ceramic materials.

These NTC thermistors are radial resin-coated and effectively limit high surge currents. Integrating an MF72 NTC thermistor into the power supply loop is a straightforward and efficient method to mitigate switch-on surge currents, thereby protecting sensitive electronic equipment.

Applications of the MF72 NTC Thermistor

Versatile Use Cases

Power Supplies: Ideal for use in conversion power supplies, switch-mode power supplies, and UPS power supplies.
Electronic Circuits: Suitable for power supply circuits in various electronic equipments.
Heating Elements: Commonly used in electric heaters and other thermal heating applications.
Electronic ballasts and Lighting: Protects Electronic ballasts, filaments in bulbs, electronic energy-saving lamps,and other lighting equipment.
Display and Oscillation Systems: Ensures safe and reliable operation in display units.
Application Example of NTC Thermistor for surge suppression

Advantages of Using MF72 Thermistor

1.Extended Service Life: Designed for longevity and reliability in various applications.
2.Compact size: Small size with substantial power surge handling capabilities
3.Rapid response: fast response to surge currents
4.Strong Surge Protection: Effectively limits inrush current, preventing potential damage to circuits.
5.High Efficiency: High material constant (B value) and low residual resistance
6.Wide Range of Electrical Characteristics: Customizable to meet diverse application needs.
7.Minimal Power Consumption: Minimal power loss during steady-state operation (typically 1W or less).
8.Superior Reliability: Excellent thermal and electrical reliability.
9.Diverse Electrical Options: Wide selection of electrical characteristics
10.Wide Temperature Range: Wide operating temperature -55~+200 ℃.
11.RoHS compliant
Comparison without and with MF72 NTC thermistor application

Main Features of MF72 Thermistor

Main Technical Parameters

Item	Parameter	Description
1	Zero Power Resistance Value R25 (Ω)	Varies by model
2	Maximum Stable Current I (A)	Varies by model
3	Approximate Resistance at Maximum Current(Ω)	Varies by model
4	Thermal Time Constant (S)	Varies by model
5	Dissipation Factor (mW/°C)	Varies by model
6	Operating Temperature Range	-55°C to +200°C

Dimensions

The dimensions and appearance of the MF72 series thermistors are as follows:

Dimension(Unit: mm):

Selection Guide of MF72 NTC Thermistor

When selecting an MF72 NTC thermistor for surge suppression, consider the following:

1. Maximum operating current > Actual operating current in the power loop
2. Rated zero power resistance at 25C of which,

E: loop voltage, Im: Surge current
For conversion power, reversion power, switch power, UPS power, Im=100 times operating current
For filament, heater, Im =30 times the operating current

Working Principle

Surge Current Suppression Using NTC Thermistors

When turning on electrical equipment, a significant surge current occurs immediately. This surge can be effectively restrained by using a power MF72 NTC thermistor connected in series with the power circuit, which may include components like capacitors, heaters, or motors. This inrush current lasts short, but its peak current is prodigious. It can even exceed 100 times of operating current in conversion power, switch power and UPS power.

Importance of Limiting Surge Current

To effectively manage this surge current, an NTC thermistor is crucial. When current is applied to the NTC thermistor, its resistance decreases rapidly as it heats up.A power-type MF72 NTC thermistor has a specified zero power resistance. When placed in series with the circuit, it effectively restrains the switch-on surge current. Once the surge current limiting function is completed, the thermistor's resistance drops to a negligible level, allowing normal operation without significant power consumption.

Benefits of Using NTC Thermistors

Applying a power NTC thermistor in the power supply loop is a most effectively and most brief measure to restrain surge current,protecting electrical equipment from destruction.Be noticed, the NTC thermistor can not be used in parallel in the circuit since one unit will tend to conduct all the current available nearly.Therefore,thermistor may be used in the AC(position A1 or A2) or the DC(position D1 or D2) locations in the circuit(see Fig A).

Part Number Marking of MF72 Thermistor

MF72 NTC thermistor inrush current limit part number

1.Series: MF72 - NTC Thermistor for surge suppression
2.R25 Resistance: 10-10Ω
3.Dimension:D-Diameter of the NTC Thermistor
4.Chip Diameter: 11-Φ11mm

Model List

MF72 D5 Series
MF72 D8 Series
MF72 D10 Series
MF72 D13 Series
MF72 D15 Series
MF72 D20 Series
Etc.
Product Coating color: black or green

Specifications and Part No.:

Item	Part No.	Resistance R 25（Ω）	Max Steady State Current (A)	Approx. Resistance Value at Maximum Current (Ω)	Dissipation Factor (mW/oC)	Thermal Time Constant (sec)	Dimensions (mm)
Item	Part No.	Resistance R 25（Ω）	Max Steady State Current (A)	Approx. Resistance Value at Maximum Current (Ω)	Dissipation Factor (mW/oC)	Thermal Time Constant (sec)	Dmax	Tmax	F±1
1	MF72-0.7D20	0.7	11	0.018	24	89	22.5	7	10/7.5
2	MF72-0.7D25	0.7	12	0.014	30	120	29	8	10
3	MF72-1.3D13	1.3	7	0.062	13	60	15.5	6	7.5
4	MF72-1.3D15	1.3	8	0.048	18	68	17.5	6	10/7.5
5	MF72-1.3D20	1.3	9	0.037	24	88	22.5	7	10/7.5
6	MF72-1.5D13	1.5	7	0.073	13	60	15.5	6	7.5
7	MF72-1.5D15	1.5	8	0.052	18	69	17.5	6	10/7.5
8	MF72-1.5D25	1.5	10	0.027	30	121	29	8	10
9	MF72 2.5D11	2.5	5	0.095	13	43	13	5.5	7.5 /5
10	MF72 2.5D13	2.5	6	0.088	13	60	15.5	6	7.5
11	MF72-3D9	3	4	0.12	11	34	11	5.5	7.5 /5
12	MF72 3D11	3	5	0.1	13	43	13	5.5	7.5 /5
13	MF72 3D13	3	6	0.092	14	60	15.5	6	7.5
14	MF72 3D15	3	7	0.075	18	76	17.5	6	10/7.5
15	MF72 3D20	3	8	0.055	24	88	22.5	7	10/7.5
16	MF72-3D25	3	9	0.044	32	124	29	8	10
17	MF72-4D9	4	3	0.190	11	35	11	5.5	7.5 /5
18	MF72-4D11	4	4	0.150	13	44	13	5.5	7.5 /5
19	MF72-4D13	4	5	0.120	15	67	15.5	6	7.5
20	MF72-5D5	5	1	0.353	6	20	7.0	5	5 /2.5
21	MF72-5D7	5	2	0.283	10	30	9.0	5	5
22	MF72 5D9	5	3	0.21	11	34	11	5.5	7.5 /5
23	MF72 5D11	5	4	0.156	13	45	13	5.5	7.5 /5
24	MF72 5D13	5	5	0.125	15	68	15.5	6	7.5
25	MF72 5D15	5	6	0.112	20	76	17.5	6	10/7.5
26	MF72 5D20	5	7	0.087	23	87	22.5	7	10/7.5
27	MF72-5D25	5	8	0.070	32	125	29	8	10
28	MF72-6D9	6	2	0.315	11	34	11	5.5	7.5 /5
29	MF72-6D11	6	3	0.240	13	45	13	5.5	7.5 /5
30	MF72-6D13	6	4	0.170	15	65	15.5	6	7.5
31	MF72-6D15	6	5	0.155	20	80	17.5	6	10/7.5
32	MF72-6D20	6	6	0.113	25	103	22.5	7	10/7.5
33	MF72-7D13	7	4	0.188	15	65	15.5	6	7.5
34	MF72-7D15	7	5	0.173	20	80	17.5	6	10/7.5
35	MF72-8D7	8	1	0.539	9	28	9.0	5	5
36	MF72 8D9	8	2	0.400	11	32	11	5.5	7.5 /5
37	MF72-8D11	8	3	0.255	14	47	13	5.5	7.5 /5
38	MF72-8D13	8	4	0.194	15	60	15.5	6	7.5
39	MF72-8D15	8	5	0.178	20	80	17.5	6	10/7.5
40	MF72-8D20	8	6	0.142	25	105	22.5	7	10/7.5
41	MF72-8D25	8	7	0.114	33	125	29	8	10
42	MF72-10D5	10	0.7	0.771	6	20	7.0	5	5 /2.5
43	MF72-10D7	10	1	0.616	9	27	9.0	5	5
44	MF72 10D9	10	2	0.458	11	32	11	5.5	7.5 /5
45	MF72 10D11	10	3	0.275	14	47	13	5.5	7.5 /5
46	MF72-10D13	10	4	0.206	15	65	15.5	6	7.5
47	MF72 10D15	10	5	0.18	21	85	17.5	6	10/7.5
48	MF72 10D20	10	6	0.162	24	102	22.5	7	10/7.5
49	MF72 10D25	10	7	0.130	32	125	29	8	10
50	MF72-12D7	12	1	0.816	9	27	9.0	5	5
51	MF72-12D9	12	1	0.652	11	32	11	5.5	7.5 /5
52	MF72-12D11	12	2	0.462	14	48	13	5.5	7.5 /5
53	MF72-12D13	12	3	0.316	16	65	15.5	6	7.5
54	MF72-12D15	12	4	0.250	20	75	17.5	6	10/7.5
55	MF72-12D20	12	5	0.195	25	100	22.5	7	10/7.5
56	MF72-12D25	12	6	0.156	32	126	29	8	10
57	MF72-15D13	15	3	0.335	16	60	15.5	6	7.5
58	MF72-15D15	15	4	0.268	20	75	17.5	6	10/7.5
59	MF72-16D7	16	0.7	1.003	9	27	9.0	5	5
60	MF72-16D9	16	1	0.802	11	31	11	5.5	7.5 /5
61	MF72-16D11	16	2	0.47	14	50	13	5.5	7.5 /5
62	MF72-16D13	16	3	0.338	16	60	15.5	6	7.5
63	MF72-16D15	16	4	0.276	21	70	17.5	6	10/7.5
64	MF72-16D20	16	5	0.212	25	100	22.5	7	10/7.5
65	MF72-16D25	16	6	0.160	35	126	29	8	10
66	MF72-20D9	20	1	0.864	11	30	11	5.5	7.5 /5
67	MF72-20D11	20	2	0.512	15	52	13	5.5	7.5 /5
68	MF72-20D13	20	3	0.372	16	65	15.5	6	7.5
69	MF72-20D15	20	4	0.288	21	86	17.5	6	10/7.5
70	MF72-20D20	20	6	0.201	30	98	22.5	7	10
71	MF72-20D22	20	7	0.188	30	98	24	7	10
72	MF72-22D7	22	0.6	1.108	9	27	9.0	5	5
73	MF72 22D9	22	1	0.95	11	30	11	5.5	7.5 /5
74	MF72-22D11	22	2	0.563	15	52	13	5.5	7.5 /5
75	MF72-30D9	30	1	1.022	11	30	11	5.5	7.5 /5
76	MF72-30D11	30	1.5	0.667	15	52	13	5.5	7.5 /5
77	MF72-30D13	30	2.5	0.517	16	65	15.5	6	7.5
78	MF72-30D15	30	3.5	0.438	18	75	17.5	6	10/7.5
79	MF72-33D7	33	0.5	1.485	10	28	9.0	5	5
80	MF72-33D9	33	1	1.124	11	30	11	5.5	7.5 /5
81	MF72-33D11	33	1.5	0.734	15	52	13	5.5	7.5 /5
82	MF72-47D13	47	2	0.81	17	65	15.5	6	7.5
83	MF72-47D15	47	3	0.68	21	86	17.5	6	10/7.5
84	MF72-50D9	50	1	1.252	11	30	11	5.5	7.5 /5
85	MF72-50D11	50	1.5	1.021	15	52	13	5.5	7.5 /5
86	MF72-60D5	60	0.3	1.878	6	20	7.0	5	5 /2.5
87	MF72-60D9	60	0.8	1.502	11	30	11	5.5	7.5 /5
88	MF72-60D11	60	1.5	1.215	15	52	13	5.5	7.5 /5
89	MF72-80D9	80	0.8	2.01	11	30	11	5.5	7.5 /5
90	MF72-80D11	80	1.2	1.658	15	52	13	5.5	7.5 /5
91	MF72-120D9	120	0.8	3.015	11	30	11	5.5	7.5 /5
92	MF72-120D13	120	1.2	2.124	16	65	15.5	6	7.5
93	MF72-120D15	120	1.8	1.652	22	87	17.5	6	10/7.5
94	MF72-200D5	200	0.1	18.70	6	18	7.0	5	5 /2.5
95	MF72-200D7	200	0.2	11.65	11	28	9.0	5	5
96	MF72-200D9	200	0.5	5.007	11	32	11	5.5	7.5 /5
97	MF72-400D9	400	0.2	30.30	11	32	11	5.5	7.5 /5

Power NTC thermistor for limmiting surge current with increasing max. operating current:

Item	Part No.	Resistance R 25（Ω）	Max Steady State Current (A)	Approx. Resistance Value at Maximum Current (Ω)	Max Rated Power Pmax. (W)	Dissipation Factor (mW/oC)	Thermal Time Constant (s)	Dimensions (mm)
Item	Part No.	Resistance R 25（Ω）	Max Steady State Current (A)	Approx. Resistance Value at Maximum Current (Ω)	Max Rated Power Pmax. (W)	Dissipation Factor (mW/oC)	Thermal Time Constant (s)	Dmax	Tmax	F±1	Curved Lead Wire
1	MF72-1D20	1	16	0.027	5	28 min	110 max	22.5	7	10	S
2	MF72-1D25	1	20	0.021	7	30 min	130 max	29	8	10	S
3	MF72-1D30	1	30	0.014	8	40 min	190 max	36	8.5	18	S
4	MF72 2.5D15	2.5	9.5	0.044	3.5	22 min	75 max	17.5	6	7.5	17/5
5	MF72-5D15	5	8	0.058	3.5	22 min	75 max	17.5	6	7.5	17/5
6	MF72-5D20	5	12	0.047	5	28 min	110 max	22.5	7	10	S
7	MF72-5D25	5	14	0.047	7	30 min	130 max	29	8	10	S
8	MF72-10D15	10	7	0.098	3.5	22 min	75 max	17.5	6	7.5	17/5
9	MF72-10D20	10	8	0.085	5	28 min	110 max	22.5	7	10	S
10	MF72-10D25	10	10	0.084	7	30 min	130 max	29	8	10	S
11	MF72-10D30	10	13	0.056	8	40 min	190 max	36	8.5	18	S

a. S shows straight lead wire;
b. 17/5:17 shows the long bend lead wire; 5 shows the short bend lead wire.

Note：
1.Unless particular indication,the allowable tolerance of the R25 Resistance is ±20%
2.Encapsulation mode can be made per customer’s requirement.
3.Wire shape kinked form can be selected.
4.Can be custom-made per customer's requirement.

Item	Part No.	Resistance R 25（Ω）	Max Steady State Current (A)	Approx. Resistance Value at Maximum Current (Ω)	Dissipation Factor (mW/oC)	Thermal Time Constant (sec)	Dimensions (mm)
Item	Part No.	Resistance R 25（Ω）	Max Steady State Current (A)	Approx. Resistance Value at Maximum Current (Ω)	Dissipation Factor (mW/oC)	Thermal Time Constant (sec)	Dmax	Tmax	F±1
1	MF72 5D13	5	5	0.125	15	68	15.5	6	7.5
2	MF72-8D15	8	5	0.178	20	80	17.5	6	10/7.5
3	MF72-20D20	20	6	0.201	30	98	22.5	7	10

a. S shows straight lead wire;
b. 17/5:17 shows the long bend lead wire; 5 shows the short bend lead wire.

User Reviews and Summary of MF72 NTC thermistor

User Reviews

Users consistently commend the MF72 series NTC Thermistor for its reliability and effectiveness in protecting electronic circuits from surge currents. The MF72 Thermistor's fast response time and minimal power consumption are often highlighted as key benefits.

Summary

The MF72 series NTC Thermistor is an excellent choice for applications requiring robust surge suppression. Its combination of high reliability, wide operational range, and efficient performance makes it a valuable component in safeguarding electronic devices and circuits.

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