?2008 littelfuse, inc. revised: october 24, 2008 polyfuse ? resettable ptcs ?2008 littelfuse, inc. polyfuse ? resettable ptcs st series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/st.html for current information. st series axial lead battery strap type > st series st series the new st series device provides reliable, noncycling protection against overcharging and short circuits events for rechargeable battery cells where resettable protection is desired. electrical characteristics part number i hold (a) i trip (a) v max (vdc) i max (a) p d max. (w) maximum time to trip resistance agency approvals current (a) time (sec.) r min ( ) r typ ( ) r 1max ( ) 15st120 1.2 2.7 15 100 1.2 6.00 5.00 0.085 0.160 0.220 xx 15st120s 1.2 2.7 15 100 1.2 6.00 5.00 0.085 0.160 0.220 xx 15st175 1.75 3.8 15 100 2.5 8.75 5.00 0.050 0.090 0.120 xx 15st175s 1.75 3.8 15 100 2.5 8.75 5.00 0.050 0.090 0.120 xx 30st200 2.00 4.4 30 100 1.9 10.00 4.00 0.030 0.060 0.100 xx 30st350 3.50 6.3 30 100 2.5 20.00 3.00 0.017 0.031 0.050 xx 30st420 4.20 7.6 30 100 2.9 20.00 6.00 0.012 0.024 0.040 xx i hold = hold current: maximum current device will pass without tripping in 20c still air. i trip = trip current: minimum current at which the device will trip in 20c still air. v max = maximum voltage device can withstand without damage at rated current (i max) i max = maximum fault current device can withstand without damage at rated voltage (v max ) p d = power dissipated from device when in the tripped state at 20c still air. r min = minimum resistance of device in initial (un-soldered) state. r typ = typical resistance of device in initial (un-soldered) state. r 1max = maximum resistance of device at 20c measured one hour after tripping or re?ow soldering of 260c for 20 sec. caution: operation beyond the speci?ed rating may result in damage and possible arcing and ?ame. description features applications t 3 p ) 4 d p n q m j b o u b o e leadCfree t 8 f m e b c m f / j d l f m u f s n j o b m t t - p x s f t j t u b o d f t 1 s p w j e f t p w f s d v s s f o u protection at 125c trip temperature t 3 f d i b s h f b c m f c b u u f s z d f m m protection agency approvals agency agency file number e183209 r50119583 items with s at end of part number identify items with slit lead option. see dimension drawing and part ordering number system sections of this document for more information.
revised: october 24, 2008 ?2008 littelfuse, inc. polyfuse ? resettable ptcs st series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/st.html for current information. axial lead battery strap type > st series ambient operation temperature -40c -20c 0c 23c 40c 50c 60c 70c 85c part number hold current (a) 15st120 1.90 1.70 1.50 1.20 1.00 0.90 0.80 0.70 0.50 15st120s 1.90 1.70 1.50 1.20 1.00 0.90 0.80 0.70 0.50 15st175 2.50 2.30 2.00 1.75 1.50 1.30 1.20 1.10 0.90 15st175s 2.50 2.30 2.00 1.75 1.50 1.30 1.20 1.10 0.90 30st200 3.20 2.80 2.50 2.00 1.70 1.60 1.40 1.20 0.90 30st350 5.40 4.80 4.30 3.50 3.00 2.80 2.50 2.20 1.70 30st420 6.40 5.70 5.10 4.20 3.60 3.30 3.00 2.60 2.10 temperature rerating temperature rerating curve -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 10% 30% 50% 70% 90% 110% 130% 150% 170% temperature (c) percentage of rated current average time current curves the average time current curves and temperature rerating curve performance is affected by a number or variables, and these curves provided as guidance only. customer must verify the performance in their application. time in seconds current in amperes 0.01 0.1 1 10 1 10 100 1000 1.20 a 1.75 a 2.00 a 3.50 a 4.20 a st
?2008 littelfuse, inc. revised: october 24, 2008 polyfuse ? resettable ptcs ?2008 littelfuse, inc. polyfuse ? resettable ptcs st series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/st.html for current information. st series axial lead battery strap type > st series environmental speci?cations operating/storage temperature -40c to +85c maximum device surface temperature in tripped state 125c passive aging +70c, 1000 hours -/+5% typical resistance change humidity aging +85c, 85% r.h., 7 days, -/+5% typical resistance change vibration milCstdC883c, condition a, no change physical speci?cations lead material 0.13mm nominal thickness, quarter-hard nickel insulating material polyester tape part marking system dimensions e b d1 d2 c a slit e b d1 d2 c a nominal 0. 5 x 4.0 (.02x .1 5 ) figure 1 figure 2 (items with s at end of part number) part number fig. abcd1d2e inches mm inches mm inches mm inches mm inches mm inches mm min. max. min. max. min. max. min. max. min. max. min. max. min. min. min. min. min max. min. max. 15st120 1 0.78 0.87 19.9 22.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1.0 0.22 5.5 0.22 5.5 0.01 0.22 3.9 4.1 15st120s 2 0.78 0.87 19.9 22.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1.0 0.22 5.5 0.22 5.5 0.01 0.22 3.9 4.1 15st175 1 0.82 0.91 20.9 23.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1.0 0.16 4.1 0.16 4.1 0.01 0.16 3.9 4.1 15st175s 2 0.82 0.91 20.9 23.1 0.19 0.20 4.9 5.2 0.02 0.04 0.6 1.0 0.16 4.1 0.16 4.1 0.01 0.16 3.8 4.2 30st200 1 0.84 0.92 21.3 23.4 0.40 0.43 10.2 11.0 0.02 0.04 0.5 1.1 0.20 5.0 0.20 5.0 0.19 0.21 4.8 5.4 30st350 1 1.12 1.25 28.4 31.8 0.51 0.53 13.0 13.5 0.02 0.04 0.5 1.1 0.25 6.3 0.25 6.3 0.24 0.26 6.0 6.6 30st420 1 1.20 1.28 30.6 32.4 0.51 0.54 12.9 13.6 0.02 0.04 0.5 1.1 0.20 5.0 0.20 5.0 0.24 0.26 6.0 6.7 lot number (contact littelfuse for additional information) s t 120 xx9u product series current rating littelfuse t rademark top side
revised: october 24, 2008 ?2008 littelfuse, inc. polyfuse ? resettable ptcs st series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/st.html for current information. axial lead battery strap type > st series quantity code: u = 5 00 (bulk) voltage rating (vdc) series hold current (value divided by 100 = hold current in amps) lead options: blank = standard s = slit lead 15 st 175 s u packaging part ordering number system part number ordering number i hold (a) i hold code packaging option quantity quantity & packaging codes 15st120 15st120u 1.2 120 bulk 500 u 15st120s 15st120su 1.2 120 bulk 500 u 15st175 15ST175U 1.75 175 bulk 500 u 15st175s 15st175su 1.75 175 bulk 500 u 30st200 std200u 2.00 200 bulk 500 u 30st350 std350u 3.50 350 bulk 500 u 30st420 std420u 4.20 420 bulk 500 u
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