- Dimensions, logo, appearance and packaging
1,Dimensions
| Dimensions(mm) |  |
| Dmax | F | hmax | Hmax | L | d |
| 16.0 | 8.0±1.0 | 25.0 | 12.0 | 4.5±1.5 | 0.7±0.1 |
| Note: There is a PTC thermistor between pins 1 and 2, and a
varistor between pins 2 and 3. |
2, Product identification
| Model | MZ11-10E300-500RM/14D391 |
3,Packaging material and color
■ Silicone resin ■ Green
4,Lead wire
■ Tinned leads ■ Inward bend
二,Electrical performance:
| Serial number | Project | experiment method | skills requirement |
| 2.0 | standard test conditions | Generally test at 25±2℃, 65%RH | |
| 2.1 | PTC zero power resistor(Rn) | After the test sample is placed in still air at 25±2°C for 2 hours,
measure it with a resistance meter with an accuracy of not less
than 0.5Ω. | ( 30-50 ) Q土2% |
| 2.2 | PTC non-operating current | Place the PTC in still air at a temperature of 70±2°C with a power
supply voltage of 220VAC and a current of 20mA for 60min. | 90mA I△R/Rn≤50% |
| 2.3 | PTC action characteristics | Put the PTC in an environment with a temperature of 25±2°C, a power
supply voltage of 220VAC, and a current of 100mA, and the PTC will
enter a high-resistance state within 2 minutes. | 250mA≤300S |
| 2.4 | PTC Curie temperature | Put the PTC in a constant temperature box, and measure the zero
power resistance value with a multimeter at a heating rate of 5
minutes/°C. The resistance value is equal to the temperature when
the resistance value is twice the room temperature resistance. | 115±7℃ |
| 2.5 | Varistor voltage | The voltage across the varistor at 1mA DC current. | 390±10% VDC |
| 2.6 | Working voltage | Ambient temperature 25±2℃ | 275VAC |
| 2.7 | PTC withstand power frequency voltage (V) | Under the ambient temperature of 25±2°C, the power supply voltage
is 220VAC, the PTC initial current is 300mA for 15S, then suddenly
changes to 420V, lasts 30S, stands still for 24h, and retests the
zero-power resistance value according to 2-1. | 450Vac I△R/Rn≤30% |
| Serial number | Project | Experiment method | Skills requirement |
3.1
| Exterior | visual inspection | The surface is bright and smooth, and the printing is correct and
clear, without any visible damage that reduces usability. |
| 3.2 | Terminal strength | According to GB2423-29 experiment u, test Ua, pull 10N, time 10S;
test Ub, bend 90°, pull 5N, twice in a row; test Uc, twist 180°,
twice in a row; stand at room temperature for 24 hours, Press 2-1
to retest the zero power resistance value. | no mechanical damage |
| 3.3 | Vibration test | The vibration frequency is 10Hz-55 Hz-10 Hz; the amplitude is the
simple harmonic vibration of 0.75. According to 4.16 in GB10193-88 | no mechanical damage |
| 3.4 | Solderability | According to GB2423-28 experiment Ta, the experiment adopts welding
bath method, the temperature is 235±5℃; the immersion time is 2±0.5
seconds; the immersion depth is 2±0.5mm. | At least 90% continuous fresh solder on the terminal |
| 3.5 | Resistance to soldering heat | Conduct the experiment according to GB2423-29 experiment Tb, after
standing at room temperature for 24 hours, retest the zero power
resistance value. | Change rate of resistance value before and after
experiment△R/Rn≤20% |
四, Weather resistance test
| Serial number | Project | Experiment method | skills requirement |
| 4.1 | High temperature storage (except T type) | After being placed at 125±2°C without load for 1000 hours, take it
into room temperature and humidity, place it for more than 1 hour
and within 2 hours, and measure its characteristics | Nominal resistance change rate≤±15% |
| 4.2 | wet storage | After 1000 hours of no-load storage at 40±2℃, 90%-95%RH, take it
into room temperature and humidity, place it for more than 1 hour
and within 2 hours, and measure its characteristics |
| 4.3 | low temperature storage | After being placed at -40±2°C without load for 1000 hours, take it
into room temperature and humidity, place it for more than 1 hour
and within 2 hours, and measure its characteristics |
Temperature characteristics
The resistance-temperature characteristics of the thermistor can be
approximately expressed by the following formula:
R=R0exp{B(1/T-1/T0)}: R: resistance value at temperature T(K), Ro:
temperature T0, ( K) resistance value, B:B value,
*T(K)=t(ºC)+273.15. In fact, the B value of the thermistor is not
constant, and its variation varies depending on the material
composition, and the maximum can even reach 5K/°C. Therefore, when
formula 1 is applied in a larger temperature range, there will be a
certain error between the measured value and the actual value.
Here, if the value of B in Equation 1 is calculated as a function
of temperature shown in Equation 2, the error between the measured
value and the actual value can be reduced, and it can be considered
to be approximately equal.
BT=CT2+DT+E, in the above formula, C, D, E are constants. In
addition, the fluctuation of B value caused by different production
conditions will cause the constant E to change, but the constants C
and D remain unchanged. Therefore, when discussing the fluctuation
of B value, only the constant E needs to be considered. Calculation
of constants C, D, E, constants C, D, E can be obtained from 4
points (temperature, resistance value) data (T0, R0). (T1, R1).
(T2, R2) and (T3, R3), Calculated by formulas 3-6. First, calculate
B1, B2, and B3 based on the resistance values of T0 and T1, T2, and
T3 from sample 3, and then substitute them into the following
samples.
Calculation example of resistance value: According to the
resistance-temperature characteristic table, find the resistance
value of the thermistor at 25°C with a resistance value of 5 (kΩ)
and a deviation of B value of 50 (K) at 10°C to 30°C. . Step (1)
Calculate the constants C, D, and E according to the table of
resistance-temperature characteristics.
To=25+273.15T1=10+273.15T2=20+273.15T3=30+273.15 (2) Substitute
BT=CT2+DT+E+50 to find BT. (3) Substitute the value into R=5exp
{(BT1/T-1/298.15)} to find R. *T:10+273.15～30+273.15.
Main Feature
1. High sensitivity, its temperature coefficient of resistance is
10 to 100 times larger than that of metal, and can detect
temperature changes of 10-6°C; 2, Wide operating temperature range,
normal temperature devices are suitable for - 55°C to 315°C, high
temperature The applicable temperature of the device is higher than
315°C (currently the highest can reach 2000°C), and the low
temperature device is suitable for -273°C ~ 55°C;
3. Small in size, it can measure the temperature of gaps, cavities
and blood vessels in organisms that cannot be measured by other
thermometers;
4. It is easy to use, and the resistance value can be arbitrarily
selected between 0.1 and 100kΩ;
5. It is easy to process into complex shapes and can be
mass-produced;
6. Good stability and strong overload capacity.
Application
◆ Automotive on-board charging
◆ Discharge - charge circuits
◆ Power inverters
◆ Server power surge protection
◆ Servo motor control
◆ Welding equipment
Note: Various models can be customized according to customer
requirements.
