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B57238S0479M051 Datasheet(PDF) 3 Page - EPCOS |
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B57238S0479M051 Datasheet(HTML) 3 Page - EPCOS |
3 / 14 page Reliability data Test Standard Test conditions ∆R 25/R25 (typical) Remarks Storage in dry heat IEC 60068-2-2 Storage at upper category temperature T: 170 °C t: 1000 h < 10% No visible damage Storage in damp heat, steady state IEC 60068-2-78 Temperature of air: 40 °C Relative humidity of air: 93% Duration: 21 days < 5% No visible damage Rapid temperature cycling IEC 60068-2-14 Lower test temperature: 55 °C Upper test temperature: 170 °C Number of cycles: 10 < 10% No visible damage Endurance I = Imax t: 1000 h < 10% No visible damage Cyclic endurance I = Imax, 1000 cycles On-time = 1 min Cooling time = 6 min < 10% No visible damage Transient load Capacitance = Ctest Number of cycles: 1000 < 5% No visible damage Note The self-heating of a thermistor during operation depends on the load applied and the applicable dissipation factor. When loaded with maximum allowable current/power and the specified dissipation factor is taken as a basis, the NTC thermistor may reach a mean temperature of up to 250 °C. The heat developed during operation will also be dissipated through the lead wires. So the contact areas, too, may become quite hot at maximum load. When mounting NTC thermistors you have to ensure that there is an adequate distance between the thermistor and all parts which are sensitive to heat or combustible. Inrush current limiters B57238S0***M0** ICLs S238 Page 3 of 14 Please read Cautions and warnings and Important notes at the end of this document. |
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