20kR 30kR 47kR 50kR / ohm Glass Sealed NTC Thermistor with body size 2x4mm
| Features: 1. Body sizeΦ2mm X 4mm
2. resistance range: 20kR 30kR 47kR 50kR / ohm
3. B value range: 3920&4200k
4. -40 ~ +300℃ operating temperature range
5. Agency recognition:UL/cUL
6. RoHS compliant Recommended applications Rice cooker, microwave oven, electric cooker, coffee pot, electric blanket, soy sauce pot, toaster etc. Code number and specifications: 
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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－2002-3950 | 20 | 1,2,3,5,10 | 25/50 | 3950 | 1,2,3,5 | 100 | ≧2 | ≦9 | -40～+300 |
| WS-MFB－2002-4200 | 20 | 25/50 | 4200 |
| WS-MFB－3002-3950 | 30 | 25/50 | 3950 |
| WS-MFB－4702-3950 | 47 | 25/50 | 3950 |
| WS-MFB－5002-3950 | 50 | 25/50 | 3950 |
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
Payment and Shipping:
1, Lead time about 3~5 days.
2, Payment: T/T; Western union; Paypal .
3, Shipping: by DHL, Fedex, TNT, UPS, EMS ect
Contact: Angel Sun
Tel: +86-13528847020
Email: Admin@winsunhk.cn
Skype: Angelsun618
Whatsapp: 13528847020
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Product Tags:
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20kR 30kR 47kR 50kR / Ohm Ntc Ptc Thermistor With Body Size 2x4mm Images
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