Recommended applications: Rice cooker, microwave oven, electric cooker, coffee pot, electric blanket, soy sauce pot, toaster etc.
Features: 1. Body sizeΦ2mm X 4mm
Code number and specifications: Dimensions:
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Characteristics:
Part no. | Zero power resistance @ 25°C | Tolerance of R25 | B value | Tolerance of B value | Max. Power Dissipation At 25°C | Dissipation Factor | Thermal Time constant | Operating temperature range | |
R25 (KΩ) | ( ±%) | (K) | (±%) | Pmax(mW) | δ(mW/°C) | τ(Sec.) | (°C) | ||
WS-MFB-1004-4400 | 1000 | 1,2,3,5,10 | 25/50 | 4400 | 1,2,3,5 | 100 | ≧2 | ≦9 | -40~+300 |
WS-MFB-1384-4400 | 1388 | 25/50 | 4400 |
Ps.:can be tailored according to clients’ demand
operating current:
In order to make the test more accurate, the running current should be as less as possible. The following formula is suggested:
I=sqrt(0.005δT^2/(B*R))
PS.:1.sqrt is for square root
2. δ is for dissipation constant in mW/℃
3. T is for temperature in Kelvins
4.B is for the index of the thermal sensitivity
5.R is for zero-power resistance in KOHM
6.final current is in mA
R-T characteristic curve
Reliability test:
No. | item | standard | Test conditions | specifications | ||||
1 | Low temperature storage | IEC 60068-2-21 | Lowest operating temperature*1000H | No visible damage ∣△R25/R25∣≦ 2% | ||||
2 | High temperature storage | IEC 60068-2-21 | Highest operaing temperature*1000H | No visible damage ∣△R25/R25∣≦ 3% | ||||
3 | Thermal shock | IEC 60068-2-14 | 10 cycles | No visible damage ∣△R25/R25∣≦ 2% | ||||
step | temperature(℃) | period(ms) | ||||||
1 | Low temperature ±5℃ | 30±3 | ||||||
2 | Room temperature | 5±3 | ||||||
3 | High temperature ±5℃ | 30±3 | ||||||
4 | Room temperature | 5±3 | ||||||
(internal test: 100 cycles) | ||||||||
4 | Constant temperature and humidity | IEC 60068-2-3 | 60℃, 93%±3% RH; 1000H (internal test: 56 days) | No visible damage ∣△R25/R25∣≦ 2% | ||||
5 | Life test | IEC 60539-1 4.26 | 25±5℃, Pmax; 1000hrs (internal test: 56 days) | No visible damage ∣△R25/R25∣≦ 3 % |
● storage conditions:
1. storage temperature: -10℃~+40℃
2.relative humidity:≦75%RH
● Period of Storage:one year
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