20mm Bead NTC Thermistor Assembly 50K B Constant B25/85 3435 For
Body Temperature
Description Of The 20mm Bead NTC Thermistor Assembly
Thin-film thermistors are mainly used for various temperature
environment measurements; thin-film thermistors are mainly used in
communications, electronic equipment, medical equipment, switching
power supplies, mobile phone battery protection boards, computer
motherboard CPU protection, electronic gifts, desk calendars,
thermometer displays, etc. .
Typical Application Of The 20mm Bead NTC Thermistor Assembly
1. Temperature control and temperature detection of household
appliances such as induction cooker, electric pressure cooker, rice
cooker, electric oven, disinfection cabinet, water dispenser,
microwave oven, electric heater;
2. Temperature detection and temperature compensation for medical
equipment (such as copiers, printers, etc.);
3. Temperature control and testing of industrial, medical,
environmental, meteorological and food processing equipment;
4. Temperature protection of rechargeable battery packs and
chargers;
5. Temperature compensation for instrument coils, integrated
circuits, quartz crystal oscillators and thermocouples.
Main Features Of The 20mm Bead NTC Thermistor Assembly
1. The product is epoxy thermistor
2. Good stability and high reliability
3. Wide resistance range: 2~500KΩ
4. High resistance and B value accuracy
5. Glass packaging, can be used in harsh conditions such as high
temperature and high humidity
6. Small size, sturdy structure, easy to install automatically
7. Operating temperature range -30~+90℃
8. Fast thermal induction and high sensitivity
9. Standard R25 values are 5kohms,10kohms,50kohms and 100kohms with
lengths of 11mm.15mm,20mm,25mm, 36mm,44mm.45mm,50mm, and 75mm .
Standard Specification Of The 20mm Bead NTC Thermistor Assembly
| Part Number | Norminal Resistance | B Value(K) | Operating temperature |
| R25 (KΩ) | Tolerance | (25/50℃) | (25/85℃) | Tolerance | (℃) |
| MF55□502□3270A | 5 | ±1％ ±2％ ±3％ ±5％ | 3270 | | ±1％ ±2％ ±3％ ±5％ | -50～125 |
| MF55□502□3470A | 5 | 3470 | |
| MF55□103□3380A | 10 | 3380 | |
| MF55□103□3435B | 10 | | 3435 |
| MF55□103□3470B | 10 | | 3470 |
| MF55□103□3950A | 10 | 3950 | |
| MF55□103□3975B | 10 | | 3975 |
| MF55□203□3950A | 20 | 3950 | |
| MF55□303□3950A | 30 | 3950 | |
| MF55□473□3950A | 47 | 3950 | |
| MF55□503□3950A | 50 | 3950 | |
| MF55□104□3950A | 100 | 3950 | |
Notes:
1). Do not bend the resistance wire frame at will to avoid the chip
and wire frame falling off and causing poor resistance;
2). The temperature should not exceed 300℃ during welding, and the
welding time should not exceed 0.5 seconds;
3). Use a hot air gun when shrinking the sleeve, and the
temperature of the air gun should be controlled at about 120℃;
4). Use a constant-temperature soldering iron when soldering, with
a flat soldering iron tip, holding the resistor in one hand and the
wire in the other for butt welding, which can improve production
efficiency and shorten welding time;
5). Special Note: Do not touch the chip (ie the top of the
resistor) with your hands!
6). Custom made is available
Dimension Of The 20mm Bead NTC Thermistor Assembly (mm)
Total Length= 11mm 
|
Total length=15mm 
|
Total length=20mm 
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Total length=20mm(Width=3.6mm) 
|
Total length=20mm(Width=4.5mm) 
|
Total length=36mm 
|
Total length=44mm 
|
Total length=45mm 
|
Total length=50mm 
|
Total length=75mm 
|
ROHS & REACH Certification Of The 20mm Bead NTC Thermistor Assembly
Related Products Of The 20mm Bead NTC Thermistor Assembly
Mechanical properties
1. Resistance to welding heat
The terminal is immersed in a solder bath at a distance of 260±5°C
to 2.0mm from the body, and kept for 5±1 seconds. The rate of
change of the rated zero-power resistance should be within ±1% of
the initial value.
2. Solderability
After immersing the terminals in the soldering bath at 235±5℃ for
2±0.5s, about 90% of the terminals should be evenly covered with
solder.
3. Free fall
The maple board has been dropped three times from a height of 0.75m
without obvious damage, and the rated zero-power resistance change
rate should be within ±1% of the initial value.
4. Termination robustness
After applying 1N load weight to the terminal for 10±1s, there is
no obvious damage, and the rated zero-power resistance change rate
should be within ±1% of the initial value.
Insulation resistance
Insulation resistance should exceed 100MΩ measurement
DC 100V between film area and terminal
Climate test
1. Dry heat
After the test sample is exposed to air at 90±1℃ for 1000 hours,
the rate of change of the rated zero-power resistance should be
within ±1% of the initial value.
2. Damp heat
After the test sample is exposed to 40±2℃ and 95% humidity for 1000
hours, the rate of change of the rated zero-power resistance should
be within ±1% of the initial value.
3. Cold
After the test sample is exposed to air at -30±1℃ for 1000 hours,
the rate of change of the rated zero-power resistance should be
within ±1% of the initial value.
4. Loading
When the temperature is 40±2℃, the humidity is 95%, and the
humidity is 1000h, after applying a DC 1mA current to the sample,
the rate of change of the rated zero-power resistance should be
within ±1% of the initial value.
5. Changes in temperature
One cycle of temperature change shall be performed in the order of
the following conditions.
Room ambient temperature. (initial value)
Place at -25±3℃ for 30 minutes.
Room temperature, 3 minutes.
Place at +90±2℃ for 30 minutes.
Room temperature, 3 minutes.
After 100 cycles, the rate of change of the rated zero-power
resistance should be within ±1% of the initial value.
