? all specifications are subject to change without notice. (1/2) 002-01 / 20030730 / e532_rlf12545.fm inductors rlf series rlf12545 type for power line smd this inductor is designed for power circuits that require a low pro- file, low inductance, and large current, such as those used in note- book pcs. it measures l12.5 w12.8 t4.5mm, about 40% lower in profile than our existing products (the slf12575 type). features with the height at only 4.5mm, and retaining the dc current superimposition characteristic, this inductor reduces dc resis- tance 20 to 50% lower than our existing products(the slf12575 type). structural efficiency allows for both a lower profile than, and electrical features equivalent to, our existing devices. the low profile makes the inductor particularly optimal for power circuit applications requiring low voltages and large current. the inductor allows for application of reflow solder. applications choke coils for thin-type power circuits used in notebook pcs and similar items 20w-class step-down converters specifications recommended reflow soldering conditions product identifications (1) series name (2) dimensions l w t (3) packaging style (4) inductance value (5) inductance tolerance (6) rated current packaging style and quantities operating temperature range ?20 to +105c [including self-temperature rise] storage temperature range ?40 to +105c[unit of products] 40s 60 to 120s preheating 5s natural cooling 240 5?c 220?c min. 140?c time ( s ) 120s min. 12545 12.5 12.8 4.5mm t taping(reel) 2r7 2.7 h 100 10 h m 20% n 30% 8r7 8.7a packaging style quantity taping 500 pieces/reel rlf 12545 t- 2r7 n 8r7 (1) (2) (3) (4) (5) (6)
all specifications are subject to change without notice. (2/2) 002-01 / 20030730 / e532_rlf12545.fm inductors rlf series rlf12545 type for power line smd shapes and dimensions/recommended pc board pattern electrical characteristics ? rated current: value obtained when current flows and the temperature has risen to 40 c or when dc current flows and the initial value of inductance has fallen by 50%, whichever is smaller. test equipment inductance: yhp 4194a impedance gain/phase analyzer, or equivalent dc resistance: digital milliohm meter vp-2941a matsushita, or equivalent typical electrical charcteristics inductance change vs. dc superposition characteristics inductance ( h) inductance tolerance (%) test frequency l (khz) dc resistance (m ? ) 20% rated current(a)* part no. based on inductance change based on temperature rise 1.9 30 100 3.6 13 max. 10.5 typ. rlf12545t-1r9n100 2.7 30 100 4.5 12 max. 8.7 typ. rlf12545t-2r7n8r7 4.2 30 100 7.4 9.5 max. 6.5 typ. rlf12545t-4r2n6r5 5.6 30 100 8.5 8 max. 6.1 typ. rlf12545t-5r6n6r1 7.8 30 100 10.2 7 max. 5.4 typ. RLF12545T-7R8N5R4 10 ?0 100 12.4 6 max. 5.1 typ. rlf12545t-100m5r1 12.8 0.5 12.5 0.5 3.5 0.2 ( 7.8 ) 2.5 0.2 3.5 0.2 winding start mark 2.5 0.2 100 terminal electrode 4.7max. 7.5 3.2 3.2 4 dimensions in mm dc current ( a ) 0.1 3 1 10 0.3 3 110 inductance ( h ) 2.7 h 4.2 h 5.6 h 7.8 h 10 h a l=0.1h c=20000 f specimen test circuit dc universal bridge 1.9 h
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