Product Description:
Degaussing Resistor MZ72 9 Ohm 14 Ohm 18 Ohm 27 Ohm Shell-Mounted Single-Chip Two-Legged PTC Thermistor
When a high voltage is applied to the degaussing resistor, a large impact current is generated instantaneously. At the same time, the temperature of the thermistor itself rises rapidly, the resistance increases, and the current decreases rapidly, which plays a role in degaussing. The heating resistance increases and the residual current decreases. Usually this circuit is directly connected to the switch, and when the power is turned on, the degaussing work is automatically completed.
1. Features
◆ Automatic degaussing components for color TV sets and color monitors
◆ Current limiting components in AC circuits
2. Naming method:
| MZ7 | □ | □□RM |
| Thermal model | Number of lead pins | Thermistor value |
3. Dimensions
MZ72 type MZ73 type
4． The main technical parameters
| Model | Nominal resistance
(Ω) | Operating Voltage
(V) | maximum voltage
(V) | Current attenuation characteristics(25℃) |
| I0P-P(A) | I1P-P(mA)3 | I2rms(mA)60 |
| MZ72-09RM | 9±20% | 120 | 140 | ≥15 | ≤400 | ≤12 |
| MZ72-14RM | 14±20% | 220 | 270 | ≥18 | ≤300 | ≤8 |
| MZ72-18RM | 18±20% | 220 | 270 | ≥18 | ≤300 | ≤8 |
| MZ72-20RM | 20±20% | 220 | 270 | ≥18 | ≤300 | ≤8 |
| MZ73-09RM | 9±20% | 120 | 140 | ≥15 | ≤300 | ≤6 |
| MZ73-12RM | 12±20% | 220 | 270 | ≥18 | ≤300 | ≤5 |
| MZ73-14RM | 14±20% | 220 | 270 | ≥18 | ≤300 | ≤5 |
| MZ73-18RM | 18±20% | 220 | 270 | ≥18 | ≤300 | ≤5 |
| MZ73-20RM | 20±20% | 220 | 270 | ≥18 | ≤300 | ≤5 |
| MZ73-27RM | 27±20% | 220 | 270 | ≥18 | ≤300 | ≤5
|
Degaussing 14MM 18 OHM Positive Coefficient Ceramic MZ71 MZ71-18RM PTC Thermistor
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.
Advantage
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.
| 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 |
Coating
| Coating | Material | Color |
■Coating
□No Coating | □Phenolic Resin■Silicone
□Epoxy resin □Other | ■Green □Red □Yellow □Black □Blue |
Marking
| Marking | Example |
■ Marked
□ Without Mark | MZ71-18RM AC270V |
Lead Wire
| ■Tinned Steel Wire □Tinned copper wire |
Part Numbering
Electrical Performances
| 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℃ | |
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