Degaussing MZ71 18OHM Ceramic PTC Thermistor 7.5MM Positive Coefficient Thermistor

Degaussing MZ71 18OHM Ceramic PTC Thermistor 7.5MM Positive Coefficient Thermistor

Degaussing PTC Thermistor MZ71-18RM 18OHM 30% 270V Pitch 7.5mm For CRT Color TV

I Description Of The Degaussing PTC Thermistor MZ71-18RM

MZ7 PTC thermistor are used as automatic degaussing components in color TVs and color displays, and current-limiting components in AC circuits.

MZ71, 72, 73 series PTC thermistors and Degaussing PTC Thermistorare mainly used in degaussing circuits of color TVs, displays and other CRTs, which can effectively eliminate image distortion, abnormal colors or irregular images caused by stray magnetic fields, and make color The picture is more vivid and clearer. It has the advantages of low residual current and good reliability. At present, the development trend of automatic degaussing PTC thermistors is small size, low resistance, low residual current, high impact resistance, and high reliability.

In order to eliminate image distortion, abnormal colors or irregular images caused by stray magnetic fields, automatic degaussing circuits are designed in color TVs and color displays, which are composed of PTC thermistors & degaussing resistors and degaussing coils. The principle is to add energy every time when the machine is turned on, and gradually remove the energy after normal operation, so that the electron beam is affected by the deflection coil without being affected by any external stray magnetic field. When the machine is turned on, the PTC thermistor & degaussing resistor In a low resistance state, a large current is formed in the degaussing coil, and the magnetic field line is greater than 350At, which can effectively eliminate the influence of stray magnetic fields. Then the PTC thermistor & degaussing resistor enters a high resistance state under the influence of a large current, the loop current is automatically attenuated, the residual current is very small, and it is almost open, and the magnetic field line is reduced to below 0.03At, reaching the acceptable limit under normal operation.


II Dimension Of The Degaussing PTC Thermistor MZ71-18RM (Unit:mm)

Code	Name	Technical Requirements	Lead shape
D	Diameter	14.5max	□Straight □Axis bend ■Informing
T	Thickness	6.0max
L	Length	3-5MM
W	Pitch	7.5±1.0
d	Lead diameter	0.7±0.05

III Coating Of The Degaussing PTC Thermistor MZ71-18RM

Coating	Material	Color
■Coating □No Coating	□Phenolic Resin■Silicone □Epoxy resin □Other	■Green □Red □Yellow □Black □Blue

IV Marking Of The Degaussing PTC Thermistor MZ71-18RM

Marking	Example
■ Marked □ Without Mark	MZ71-18RM AC270V

V Lead Wire Of The Degaussing PTC Thermistor MZ71-18RM

■Tinned Steel Wire                                           □Tinned copper wire

VI Electrical Performances Of The Degaussing PTC Thermistor MZ71-18RM

No.	Item	Spec	Test Condition
4-1	Nominal resistance	18Ω±30%	Put it at 25±2℃ for more than 2 hours, Test at voltage below 1.5VDC.
4-2	R-T characteristic	See Fig. 2	R-T characteristic special tester.
4-3	Rated Voltage	220 Vrms	Operating temperature range: -10℃~+60℃
4-4	Max Voltage	270 Vrms
4-5	Min degaussing coil resistance	12Ω
4-6	Current decay characteristics: Break into After 3 sec After 30 sec	>20 Ap-p <180 mAp-p <10 mArms	Temperature: 25±2℃, Test in still air, Test circuit: as shown in Fig. 1 Test voltage: 220Vrms (50-60Hz)
4-7	Curie temperature	60±7℃

VII Test Circuit Of The Degaussing PTC Thermistor MZ71-18RM

VIII Advantage Of The Degaussing PTC Thermistor MZ71-18RM

1. Has a large inrush current;
2. Low residual current;
3. Very high withstand voltage strength;
4. High impact resistance;
5. High reliability;
6. Reliable product quality;
7. Low power consumption;
8. Small size suitable for PCB;
9. No contact, no noise, long product life;
10. The product's own characteristics enable it to control the current without other controllers.
11. Comply with RoHS requirements.


VIIII Part Numbering Of The Degaussing PTC Thermistor MZ71-18RM

1. Series: color picture tube degaussing PTC thermistor, degaussing resistor-MZ7 series
2. Category:
1- Welding lead type degaussing resistance;
2-shell type (monolithic) degaussing resistor;
3-shell type (double-chip) degaussing resistor.
3. Rated zero power resistance: 18R-18Ω, 9R-9Ω.
4. Resistance tolerance: M-+/-20%, V-+/-25%, X-+30%/-20%.
5. Working voltage: 270-270VAC 140-140VAC
6. Special code: R-Comply with RoHS requirements (such as lead-free).
There are a variety of specifications to choose from, and can also be customized according to customer special requirements


X Inverter Welding Machine Spare Parts- Of The Degaussing PTC Thermistor MZ71-18RM

Inverter welding machine is more and more popular in the world since technoloy required for manufacturing,however, good protection can assured inverter welding machine functioning well for long term. We can supply
all set of components for overcurrent protection / overvoltage protection. Below is lists we supplying our customers for your ref:

Varistor	07D361K 10D471K 10D681K 14D330K 14D151K 14D221K 14D391K 20D820K 20D102K 20D121K 20D121K 20D391K 20D471K 25D431K 25D751K 25D681K 25D821K 32D431K 25D751K 32D681K 32D821K
PTC Thermistor	126A 15P 16P 16P5R0M265 08M12RM265 05M120-180 19P MZ72-18ROM MZ11-13N13-20 MZ12-16P2R1H140,MZ12-16P4R7H140,MZ11-16P5R0H265,MZ11-16P6R0H265,MZ11-16P7R0H265,MZ11-16P10RH265,MZ11-16P12RH265,MZ72-18RM
NTC Thermistor	2.5D-20 5D-20 8D-20 47D-15 2.5D-15 47D-20
Fuse	Glass fuse/Ceramic fuse 3.6x10mm/5x20mm/6.35x31.8mm/10x38mm STP/SFP/BTC/BFC/BMT/BMF/PTU/PFU Micro Fuse MTS/MFS/NTS/NFS/TMS/FMS 8x4x8mm Surface Mount Fuse 6125 2410 SET/SEF/SFE/STE/SST/SSF