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  • Functional characteristics
  • Encased Double-Element PTC Thermistor for Degaussing Color TV and Monitors – MZ73 Series
    Article No.:MZ73-7R/9R/12R/14R/18R/27R
    Rated Zero Power Resistor: 7Ω/9Ω/12Ω/14Ω/18Ω/27Ω
    Type: Black Encased Double-Element Type
    Function:Color TV Degaussing

    Brief Introduction of PTC Thermistor for Degaussing
    The MZ73 series degaussing PTC thermistors are expertly designed for automatic degaussing circuits in color TVs, color monitors, and other CRT degaussing loops. These thermistors eliminate image distortion, abnormal colors, and irregular color plaques caused by stray magnetic fields. With features like low residual current and high reliability, the MZ73 series PTC thermistors represent a significant advancement in degaussing technology. Their compact size, low resistance, and high impact resistance make them ideal for modern electronic applications.

    Dimension (Unit: mm):
    Refer to Figure 1 for the dimensions of the MZ73 PTC thermistor for degaussing.

    PTC Thermistor MZ73 Dimensional Diagrams for Degaussing

    Dimensional specifications for MZ73-A and MZ73-B PTC thermistors, highlighting differences in design for degaussing applications.

    Product Application of PTC Thermistor for Degaussing
    The MZ73 series PTC thermistors are utilized in:
    – Color TVs
    – Color Monitors
    – Other CRT degaussing loops
    Working Principle of PTC Thermistor for Degaussing
    The degaussing PTC thermistor operates based on its current-time characteristics. When connected in series with a degaussing circuit, the PTC thermistor’s initially low resistance allows a large initial current to flow through the degaussing coil, generating a powerful alternating magnetic field. As the thermistor heats up, its resistance increases, causing the current and the magnetic field to gradually attenuate, thus achieving the degaussing effect.

    This automatic degaussing loop, designed for color TVs and monitors, combines PTC thermistors with degaussing coils. It activates energy upon each power-on and gradually dissipates it, effectively counteracting stray magnetic fields.

    Advantages of PTC Thermistor for Degaussing
    1. Large inrush current
    2. Low residual current
    3. High withstand voltage
    4. High resistance to impact
    5. Excellent long-term reliability
    6. Stable performance range
    7. Low power consumption
    8. Compact size suitable for PCB mounting
    9. No junction or noise, ensuring long usage life
    10. Effective current control without additional controllers
    11. RoHS-compliant

    Marking of Part Number of PTC Thermistor for Degaussing
    Refer to Figure 2 for the part number marking of the MZ73 series PTC thermistors:

    PTC Thermistor MZ73 Part Number Marking

    Breakdown of part number marking on a PTC thermistor MZ73, essential for correct identification and application in TV degaussing.

    1. Series:PTC thermistor for CRT degaussing loops in color TVs and monitors – MZ7 series
    2. Type:
    – 1: Soldering leads type
    – 2: Encased type (single-element)
    – 3: Encased type (double-element)
    3. Rated Zero Power Resistance: 18R-18Ω, 9R-9Ω
    4. Tolerance of Resistance: M-±20%, V-±25%, X-±30%/-20%
    5. Max. Operating Voltage: 270VAC, 140VAC
    6. Special Code:R (RoHS compliant)

    Model Number of PTC Thermistor for Degaussing

    Item Part No. Rated Zero Power Resistance  
    R(N)(Ω)
    Curie temperature
    T c (℃)  
    Max Operating Voltage
    Vmax (V) 
    Current Attenuation Characteristics Condition
    Initial Current
    (Ap-p)
    After 3 Sec.
    (mAp-p)
    After 60 Sec.
    (mArms)
    Rated Vol. VN(V) Load Resistance
    RL(Ω )
    1 MZ73-4R5N140 4.5±30%    40:60 140 ≥20   ≤300    ≤8 100,120  10
    2 MZ73-7R0N270 7±30%    40:60 270 ≥25   ≤300    ≤5 220 10
    3 MZ73-9ROM270 9±20%    40:60 270 ≥25   ≤300    ≤5 220 10
    4 MZ73-10RM270 10±20%    40:60 270 ≥25   ≤240    ≤5 220 10
    5 MZ73-12RM270 12±20%    40:60 270 ≥20   ≤200    ≤5 220 10
    6 MZ73-14RM270 14±20%    40:60 270 ≥20   ≤200    ≤3 220 10
    7 MZ73-18RM270 18±20%    40:60 270 ≥20   ≤250    ≤3 220 10
    8 MZ73-27RM270 27±20%    40:60 270 ≥20   ≤240    ≤3 220 10

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