1 ? 2018 littelfuse, inc. revised: february 26, 2018 specifcations are subject to change without notice. power thermistors description littelfuse inrush current limiters (power thermistors) are specially formulated and processed ntc thermistors suitable for suppressing high inrush currents in switching power supplies and other applications where the high initial starting currents are undesirable. their unique design enables them to handle extremely high current and voltage levels. in a typical power supply application, the inrush current limiting power thermistor is used in series with the filter capacitors. upon application of the initial voltage, the device, due to its relatively high resistance, limits the current flow to an acceptable level until the capacitors are charged. thereafter, the device decreases in resistance substantially to a level where the voltage drop across it is negligible. dimensions a b c d 0.310 max 0.700 min see dim d see dim t dimensions shown in inches. st series inrush current limiters ?.900" min protective coating tinned solderable wire see chart for lead diameter ?d? inrush current limiting power thermistors 0.310" nom ?t? .700" min protective coating tinned solderable wire see chart for lead diameter see dim ?d? 0.310" nom see dim ?t? a c b d a b c d part numbering system note: not all combinations of part number codes are available. contact littelfuse for details. st 10 0 01 b no signifcance multiplier, power of 10 resistance @ 25oc base value max. steady state current (a) series inrush current limiting power thermistor power thermistors littelfuse.com
2 ? 2018 littelfuse, inc. revised: february 26, 2018 specifcations are subject to change without notice. inrush current limiting power thermistor power thermistors specifications part number resistance ohms @25c *resistance tol. % @ 25c imax max. steady state current i max (a) nominal resistance @ max. current, rimax (ohms) rimax resis. @ max. current ohms lead diameter nominal (inch) st0r713b 0.7 25 13 0.025 0.025 0.04 st1r005b 1 30 5 0.040 0.09 0.024 st1r020b 1 15 20 0.030 0.015 0.04 st1r030b 1 25 30 0.050 0.015 0.04 st1r508b 1.5 20 8 0.040 0.6 0.032 st2r018b 2 20 18 0.135 0.03 0.04 st2r503b 2.5 20 3 0.070 0.15 0.032 st2r507b 2.5 20 7 0.070 0.05 0.032 st2r509b 2.5 20 9 0.060 0.04 0.032 st2r510b 2.5 20 10 0.200 0.04 0.04 st10001b 10 20 1 0.090 0.65 0.024 st10003b 10 20 3 0.015 0.2 0.032 st10005b 10 20 5 0.015 0.2 0.04 st10006b 10 20 6 0.600 0.15 0.04 st10010b 10 20 10 0.030 0.1 0.04 st12001b 12 20 1 0.15 0 1.19 0.032 st15004c 15 20 4 0.050 0.25 0.032 st16002d 16 20 2 0.040 0.47 0.032 st20001c 20 20 0.3 0.110 1 0.024 st20002b 20 20 1.75 0.400 0.6 0.032 ST25002C 25 20 2 0.10 0 0.64 0.032 st20100b 200 20 0.1 0.170 6.3 0.018 *resistance tolerances of 1%, 2%, and 5% are available upon request st series inrush current limiters littelfuse.com
3 ? 2018 littelfuse, inc. revised: february 26, 2018 specifcations are subject to change without notice. disclaimer notice - information furnished is believed to be accurate and reliable. however, users should independently evaluate the suitability of and test each product selected for their own applications. littelfuse products are not designed for, and may not be used in, all applications. read complete disclaimer notice at: www.littelfuse.com/disclaimer-electronics specifications part number resistance ohms @25c *resistance tol. % @ 25c imax max. steady state current i max (a) nominal resistance @ max. current, rimax (ohms) rimax resis. @ max. current ohms temperature coefficient (% / c) @ 25c lead diameter nominal (inch) temperature rating (oc) st2r515b 0.7 25 13 0.500 0.025 _ 0.04 _ st4r005b 1 30 5 0.250 0.09 _ 0.024 _ st5r002b 1 15 20 0.470 0.015 _ 0.04 _ st5r004b 1 25 30 1.000 0.015 _ 0.04 _ st5r005b 1.5 20 8 0.600 0.6 _ 0.032 _ st7r004b 2 20 18 1.075 0.03 _ 0.04 _ st8r001b 2.5 20 3 0.740 0.15 _ 0.032 _ st8r003b 2.5 20 7 1.485 0.05 _ 0.032 _ st8r006b 2.5 20 9 _ 0.04 -4.4 0.032 +300 (max) st30002b 10 20 1 0.280 0.65 _ 0.024 _ st30003b 10 20 3 0.135 0.2 _ 0.032 _ st33001b 10 20 5 0.650 0.2 _ 0.04 _ st33001c 10 20 6 0.200 0.15 _ 0.04 _ st33001d 10 20 10 0.200 0.1 _ 0.04 _ st3r008b 12 20 1 0.15 0 1.19 _ 0.032 _ st3r017b 15 20 4 0.10 0 0.25 _ 0.032 _ st40002b 16 20 2 1.19 0 0.47 _ 0.032 _ st5r006b 20 20 0.3 6.300 1 _ 0.024 _ st5r007b 20 20 1.75 0.640 0.6 _ 0.032 _ st5r014b 25 20 2 0.460 0.64 _ 0.032 _ st5r008b 200 20 0.1 0.700 6.3 _ 0.018 _ * resistance tolerances of 1%, 2%, and 5% are available upon request st series inrush current limiters power thermistors inrush current limiting power thermistor power thermistors littelfuse.com
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