p olyswitch? ptc devices overcurrent protection device product: nano smd 350 lr - 2 document: scd 2 8 250 rev letter: e rev date: july 26 , 20 1 6 page no.: 1 of 3 ? 2016 littelfuse,inc littelfuse.com specifications are subject to change without notice. revised july 26, 2016 specification status: release d maximum electrical rating voltage: 6.0v dc short circuit current: 5 0a notes: 1. termination finish : niau 2 . drawing not to scale 3. for battery application only marking: p 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 t rip** resistance 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 4.0 7.5 3.5 6 . 3 1.9 3 . 6 5 .0 .004 .018 1.0 *maximum resistance is measured 24 hour s after reflow. * * values specified were determined using pcbs with 0.105 x 1.0 ounce copper traces. agency recognition: ul , csa , t v reference document: ps300 precedence: this specification takes precedence over documents referenced 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. materia ls information rohs compliant elv compliant pb - free halogen free* * halogen free refers to: br 900ppm, cl 900ppm, br+cl 1500ppm . hf
p olyswitch? ptc devices overcurrent protection device product: nano smd 350 lr - 2 document: scd 2 8 250 rev letter: e rev date: july 26 , 20 1 6 page no.: 2 of 3 ? 2016 littelfuse,inc littelfuse.com specifications are subject to change without notice. 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 met hods: 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. ? littelfuse believe s the optimum conditions for forming accept able 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. ? littelfuse request s that customer board layouts refrain from placing raised features (e.g. vias, nomenclature, traces, etc.) underneath polyswitch devices. it is possible that raised features could negatively i mpact 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 a x . (ts max ) ? time (ts min to ts max ) 150c 200c 60 - 120 s time maintained above: ? temperature (t l ) ? time (t l ) 217c 60 - 150 s peak/classification t emperature (tp) 260 c time within 5c of actual p eak t emperature (tp) 30s max . ramp d own r ate 2 c/s max . t ime 25 c to peak temperature 8 mins max . 1 . 1 0 2.00 1 . 1 0 1.75
p olyswitch? ptc devices overcurrent protection device product: nano smd 350 lr - 2 document: scd 2 8 250 rev letter: e rev date: july 26 , 20 1 6 page no.: 3 of 3 ? 2016 littelfuse,inc littelfuse.com specifications are subject to change without notice. revised july 26, 2016 i nformation furnished is believed to be accurate and reliable. however, users should independently evaluate the suitability of and test ea ch product selected for their own applications.littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, li fesaving, life - sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other app lication in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in ap plicable littelfuse product documentation. warranties granted by littelfuse sh all be deemed void for products used for any purpose not expressly set forth in applicable littelfuse documentation. littelfu se 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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