for further information on packaging, please refer to appendix c. cwh coat insulated miniature wirewound resistors features ? resistors meeting mil-prf-26 (u characteristics) ? high precision resistors with t.c.r. less than 50x10 -6 /k ? flame retardant coating (equivalent to ul94 v-0) ? automatic insertion is applicable ? various types of formings are available ? excellent in pulse characteristic ? marking: black body color precision: alpha-numeric marking ? products with lead-free terminations meet eu rohs and china rohs requirements axial: t52, t521, t631 radial: vtp, gt l forming: l12.5a, l15a, l20a, l25a ordering information 3 significant figures + 1 multiplier r indicates decimal on values <100 1: 1w 2: 2w 3: 3w h: stability c: sncu d: 0.5% f: 1% cw 3 h c style type power rating nominal resistance tolerance termination material taping and forming new part # t521 10r0 a: ammo r: reel packaging a f dimensions and construction d d marking insulation coating electrode cap lead wire l l t t ceramic core resistive wire l cw1h .374.039 (9.51.0) .138.039 (3.51.0) .031 (0.8) 1.18.118 (30.03.0) .157.039 (4.01.0) .236.039 (6.01.0) .118 (3.0) .472.039 (12.01.0) cw2h cw3h type t (max.) d d (nom.) l dimensions inches (mm) pms 300 neg. black neg. .591.039 (15.01.0) eu 129 koa speer electronics, inc. ? 199 bolivar drive ? bradford, pa 16701 ? usa ? 814-362-5536 ? fax: 814-362-8883 ? www.koaspeer.com specifications given herein may be changed at any time without prior notice. please confirm technical specifications before you order and/or use. 3/04/08 resistors 1733 reader's spreads pg1-203:document 1/27/09 4:11 pm page 127
130 koa speer electronics, inc. ? 199 bolivar drive ? bradford, pa 16701 ? usa ? 814-362-5536 ? fax: 814-362-8883 ? www.koaspeer.com specifications given herein may be changed at any time without prior notice. please confirm technical specifications before you order and/or use. 3/03/08 resistors cwh coat insulated miniature wirewound resistors part designation rated ambient temperature power rating applications and ratings t.c.r. (ppm/c) max. cw1pc cw2pc cw3pc 1w 2w 3w +25c 20: r 10 50: r<10 operating temperature range -55c to +275c 0.1 - 430 0.1 - 2k 0.1 - 3k 0.47 - 220 0.47 - 750 0.47 - 1k e-24, e-96 (d0.5%) e-24, e-96 (f1%) resistance range ( ) derating curve environmental applications % rated po wer 100 80 60 40 20 -40 0 4 08 01 202 80 ambient temperature (c) 0 25 160 275 2002 40 155 resistance t.c.r. 25c +25c/-55c and +25c/+125c within specified tolerance within specified t.c.r. performance characteristics parameter requirement ? r (% + 0.05 ) limit typical test method overload (short time) power rating x 5 for 5 seconds 0.2 0.15 resistance to solder heat 350c 10c for 3.5 seconds or 260c 5c for 10 seconds 0.2 0.15 endurance @ 70c 25c, 2000 hours 1.5 hr on, 0.5 hr off cycle 0.5 0.45 low temperature -65c, 24 hours 0.2 0.15 high temperature +275c, 250 hours 0.5 0.45 1733 reader's spreads pg1-203:document 1/27/09 4:11 pm page 128
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