polyswitch? ptc devices overcurrent protection device product: nanosmd270lr - 2 document: scd 28284 rev letter: f rev date: july 26 , 2016 page no.: 1 of 3 ? 2016 littelfuse, inc. specifications are subject to change without notice. littelfuse.com revised july 26 , 2016 specification status : r eleased maximum electrical rating voltage: 6.0 v dc short circuit current: 5 0a notes: 1. termination finish: niau 2. drawing not to scale 3. for battery application only marking: l table i. dimensions: a b c d min max min max min max min max mm: 3.00 3.43 0. 50 1 . 00 1.37 1.85 0.25 0.75 in: (0.118) (0.135) (0.0 19 ) (0.0 39 ) (0.054) (0.073) (0.010) (0.030) table ii. performance ratings: current ratings** time to trip** res istance values tripped - state power dissipation** amperes at 0c amperes at 20c amperes at 60c seconds at 20 c, 8 .0 a ohms at 20 c watts at 20 c, 6.0v hold trip hold trip hold trip max min max* max 3 .0 7.5 2 . 7 6 . 3 1. 6 4 . 5 5 .0 .00 5 .01 8 1.0 * maximu m resistance is measured 24 hour after reflow. **values s pecified were d etermined using pcbs with 0.10 5x1.0 ounce copper traces. agency recognition: ul, csa, t v reference document : ps300 precedence: this specification takes precedence over documents refere nced herein. effectivity: reference documents shall be the issue in effect on the date of invitation for bid. caution: operation beyond the rated voltage or current may result in rupture, electrical arcing or flame. materials information rohs complian t elv compliant pb - free halogen free* * halogen free refers to: br 900ppm, cl 900ppm, br+cl 1500ppm . hf
polyswitch? ptc devices overcurrent protection device product: nanosmd270lr - 2 document: scd 28284 rev letter: f rev date: july 26 , 2016 page no.: 2 of 3 ? 2016 littelfuse, inc. specifications are subject to change without notice. littelfuse.com revised july 26 , 2016 recommended pad layout (mm.) recommended reflow profile note : all temperatures refer to top side of the package, measured on the package body surface. solder reflow recommendation ? recommended reflow methods: ir, hot air and n itrogen ? recommended maximum solder paste thickness: 0.25mm ? recommended m ini mum stencil thickness: 0. 1 mm ? devices can be cleaned using standard methods and aqueous solvents. ? lf believe s the optimum conditions for forming acceptable solder fillets occur when a reasonable amount of solder paste is placed underne ath each device's termination. as such, we request that customers comply with our recommended solder pad layouts. ? customer should validate that the solder paste amount and reflow recommendations meet its application. ? lf request s that cust omer board layouts refrain from placing raised features (e.g. vias, nomenclature, traces, etc.) underneath polyswitch devices. it is possible that raised features could negatively impact solderability performance of our devices. profile feature pb - free assembly average r amp u p r ate (ts max to tp) 3c/s max . preheat ? temperature m in . (ts min ) ? temperature m ax . (ts max ) ? time (ts min to ts max ) 150c 200c 60 - 120 s time maintained above: ? temperature (t l ) ? time (t l ) 217c 60 - 150s peak/classification t emperature (tp) 260 c time within 5c of actual p eak t emperature (tp) 30 s max . ramp d own r ate 2 c/s max . t ime 25 c to peak temperature 8 mi n s max. 1 . 1 0 2.00 1 . 1 0 1.75
polyswitch? ptc devices overcurrent protection device product: nanosmd270lr - 2 document: scd 28284 rev letter: f rev date: july 26 , 2016 page no.: 3 of 3 ? 2016 littelfuse, inc. specifications are subject to change without notice. littelfuse.com revised july 26 , 2016 information furnis hed is believ ed 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 shall not be used for, any purpose (includ ing, without limitation, military, aerospace, medical, life - saving, life - sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the pro duct may result in personal injury, death, or property damage) other than those expressly set forth in applicable littelfuse product documentati on. warranties granted by littelfuse shall be deemed void for products used for any purpose not expressly set fo rth in applicable littelfuse documentation. littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by littelfuse as set forth in applicable littelfuse documentation. the sale and use of littelfuse products is subject to littelfuse terms and conditions of sale, unless otherwise agreed by littelfuse.
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