?d ma rk ing flame retardant insulating coating electrode ca p lead wire ll c resistive film d trimming line ceramic core rf25cc coat-insulated fusing resistors (constant current fusing type) features ? fu se within 60 sec onds in case of over-current ? constant current fusing type ? fuse at low magnification at 5 times or 10 times of power rating ? flame - retardant coating equivalent to ul94 v-0 ? marking : b lue body color , fifth color band green for identification with color code marking ? products meet eu rohs requirements eu d imensions and construction applications and ratings ordering information type dimensions inches (mm ) l c max. d d ( nominal ) l * rf25cc .248.020 (6.30.5) .280 (7.1) .091.012 (2.30.3) .024 (0.6) 1.18.118 (303) * lead length changes depending on taping and forming type. rf 25 power rating 25: 0.25w product code c terminal surface material c:sncu c constant current fusing type t52 taping & forming t26, t52, vtp, vte, l10a, m10x a packaging a: ammo r : reel r68 nominal resistance 3 digits k resistance tolerance k:10% power rating resistance range( ) (e-24) resistance tolerance fusing characteristics dielectric withstanding voltage 0.25w 0.1 - 0.91 k: 10% 2.5w 1.25w 60 sec max. 250v 2,000 2,000 0.1 0.11 - 0.91 taping & qty/ammo ( pcs ) fusing time rated ambient temperature: +70c operating temperature range: -40c - +155c fusing power t26a t52a rated voltage = power ratingresistance value resistors specifcations given herein may be changed at any time without prior notice. please confrm technical specifcations before you order and/or use. 11/29/11 154 koa speer electronics, inc . ? 199 bolivar drive ? bradford, pa 16701 ? usa ? 814-362-5536 ? fax: 814-362-8883 ? www.koaspeer.com
resistors specifcations given herein may be changed at any time without prior notice. please confrm technical specifcations before you order and/or use. 12/30/10 155 koa speer electronics, inc . ? 199 bolivar drive ? bradford, pa 16701 ? usa ? 814-362-5536 ? fax: 814-362-8883 ? www.koaspeer.com rf25cc coat-insulated fusing resistors (constant current fusing type) performance characteristics environmental applications fusing characteristics derating curve 100 80 60 40 20 0 -40 -20 02 04 06 08 0 100 120 140 70 160 155 % rated power ambient temperature (c) for resistors operated at an ambient temperature of 70c or above, a power rating shall be derated in accordance with derating curve on the left. performance requirements test items ? r (% +0.05 ) test methods limit typical resistance within specified tolerance 25c resistance to 5% 2.5% 350c 10c, 3.5s 0.5s or 260c 5c, 10s 1s soldering heat humidity 5% 2.5% 40c 2c, 90% - 95%rh, 1000h no load endurance at 70c 5% 2.5% 70c2c, 1000h 1.5h o n/ 0.5h off cycle resistance to solvent no abnormality the resistor shall be immersed in ipa for 30 sec. in appearance. marking shall be easily legible. flame retardant no evidence of flaming flame test: the test flame shall be applied and removed for or self-flaming. each 15 sec respectively to repeat the cycle 5 times. overload flame retardant : power corresponding to 2, 4, 8, 16 and 32 times the power rating shall be applied for each 1min. until dis-connection occurs. i-r characteristics rf25cc 0.68k fusing time 100 60 30 10 6 3 1.0 1.3 1.5 2.0 fusing time (s) current (a) fusing current (a) (0.68w) (1.15w) (1.53w) (2.72w) 10 8 6 4 2 0.1 0.2 0.4 0.68 resistance () max. 3s max. 60s rf25cc 0.68k fusing time 100 60 30 10 6 3 1.0 1.3 1.5 2.0 fusing time (s) current (a) fusing current (a) (0.68w) (1.15w) (1.53w) (2.72w) 10 8 6 4 2 0.1 0.2 0.4 0.68 resistance () max. 3s max. 60s
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