Inrush Current Limiting B57236 S 236 Applications ● Switch-mode power supplies Features ● ● ● ● ● ● Useable in series connections up to 265 Vrms Coated thermistor disk Kinked leads of tinned, copper wire Wide resistance range Available on tape UL approval (E69802) Options Resistance tolerance < 20 % available on request Dimensions in mm Approx. weight 1 g Lower/upper category temperature Max. power at 25 °C Resistance tolerance Rated temperature B value tolerance Dissipation factor (in air) Thermal cooling time constant (in air) Heat capacity Type R25 S 236/2,5/M S 236/5,0/M S 236/10/M S 236/12/M S 236/16/M S 236/20/M S 236/25/M S 236/50/M S 236/80/M Ω 2,5 5,0 10 12 16 20 25 50 80 Imax (0 … 65 °C) A 5,5 4,5 3,5 3,2 2,9 2,8 2,5 1,9 1,6 No. of R/T characteristic 1201 1202 1203 1203 1207 1208 1208 1209 1304 Pmax ∆R/RN TN ∆B/B δth τc Cth B25/100 K 2700 2800 2900 2900 2965 3065 3065 3165 3300 – 55/+ 170 2,1 ± 20 % 25 ±3% approx. 10 approx. 70 approx. 700 CT1) 230 V µF 200 300 300 300 300 300 300 300 400 CT1) 110 V µF 800 1200 1200 1200 1200 1200 1200 1200 1600 °C W °C mW/K s mJ/K Parameters for R(I) 1) k n 0,621 – 1,27 0,761 – 1,30 0,942 – 1,32 1,00 – 1,32 1,08 – 1,33 1,13 – 1,34 1,22 – 1,34 1,44 – 1,38 1,64 – 1,37 Ordering code B57236S259-M S509-M S100-M S120-M S160-M S200-M S250-M S500-M S800-M 1) For details on the capacitance CT as well as on the parameters k and n refer to pages 33–35. 78 Siemens Matsushita Components