wirewound high surge resistors whs series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 02.14 enhanced surge & pulse energy capacity ul94-v0 fameproof protection radial taped form available surface mount z-form available rohs compliant with pb-free terminations non inductive type available dimensions (mm) & weight (g) type l max d max f min d nom pcb mount centres min bend radius wt. nom whs2 9.0 3.6 19.80 0.8 12.70 1.2 0.50 whs3 14.5 5.2 24.55 20.30 1.10 WHS5 16.5 7.0 23.55 22.86 1.75 whs7 25.0 8.8 28.30 31.40 4.40 whs10 51.0 10.5 26.00 1.0 55.88 1.5 8.80 whs10n 11.0 10.50 whs2 whs3 WHS5 whs7 whs10 whs10n* power rating at 25oc watts 2 3 5 7 10 5s overload rating at 25oc watts 10 15 25 35 50 short pulse performance see pulse performance graphs resistance range ohms 1r0-330r 2r2-330r 5r6-100r tcr ppm/oc 200 isolation voltage volts 250 350 500 700 1000 resistance tolerance % <20r: 5 20r: 1, 2, 5 5% standard values e12 preferred thermal impedance oc/watt 110 82 54 35 25 ambient temperature range oc -55 to +155 construction a high purity ceramic substrate is assembled with interference ft end caps to which are welded the terminations. the resistive element is wound on the substrate and welded to the caps. flameproof silicone cement coating is applied priorto marking with indelible ink. the components are then leadformed if required and packed. electrical data physical data no limiting element voltage applies to this series; the rated voltage is (p.r). *non inductive (ayrton perry) winding f d d l
wirewound high surge resistors whs series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 02.14 maximum typical load at rated power: 1000hrs @ 25c r% 5 +0.001: 3 dry heat: 1000hrs @ 200c r% 5 +0.001: 3 short term overload r% 5 +0.001: 1 derating from rated power @25c zero at 280c (see thermal performance graph). climatic r% 5 +0.001: 2 climatic category 55/200/56 trc & vibration r% 5 +0.001: 1 robustness & solder heat r% 5 +0.001: 1 long term damp heat (56 days) r% 5 +0.001: 1 terminations material: hot tin dipped copper wire strength: the terminations meet the requirements of iec 68.2.21 solderability: the terminations meet the requirements of iec 115-1 clause 4.17.3.2 marking whs2, and whs3 resistors are marked with four colour bands in conformance with iec62 . the larger sizes are legend marked with type reference, resistance value and tolerance. flammability the resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload. solvent resistance the body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. performance data pulse performance 1 10 100 1000 1 10 100 1000 energy (joules) value (ohms) surge / pulse energy capacity (single or low repetition rate, r < 5%) whs10n whs10 whs7 WHS5 whs3 whs2
wirewound high surge resistors whs series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 02.14 application notes 1. if the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. due to operating temperature limits imposed by some pcb materials, derating may be necessary. the surface temperature rise at the centre of the body is shown under thermal performance. 3. whs2, whs3, WHS5 resistors can also be supplied with goalpost or lancet pre-formed leads. radial form is available on whs2 and whs3 only. whs2, whs3, and WHS5 are also available in an smd format with z formed leads and packed in blister tape. see the z-form datasheet for details http://www.welwyn-tt.com/pdf/datasheet/z-form.pdf thermal performance whs10n whs10 whs7 WHS5 whs3 whs2 proportion of rated power (%) temperature rise (c) derating curve body temperature rise ambient temperature c power (w) whs10n whs2 whs3 WHS5 whs7 whs10(n) whs2-7
whs2 C 100r j a25 dimensions mm b b c whs2 52 52 5 whs3 67 67 10 WHS5 63 63 10 *whs7 85 85 10 whs10 9 105 10 whs10n 9 105 20 *an offset lead length is available for whs7 series. consult factory for details ordering procedure example: whs2 at 100 ohms and 5% tolerance in ammo pack box of 2500 pieces - wirewound high surge resistors whs series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 02.14 packaging the standard packaging for whs is taped. the critical dimensions are shown in figure 1. the component wires will not protrude beyond the outside edge of the tapes. taped product is then packed into boxes or onto reels. see ordering procedure for details. alternative packaging is available by request. pre-formed resistors are supplied loose packed in plastic bags or boxes. type value (use iec62 code) tolerance (use iec62 code) packing a25 ammo whs2 2500/box standard a1 whs3 1000/box t075 tape WHS5 750/reel t07 whs7 700/reel a02 ammo whs10 200/box a01 whs10n 100/box f 1% g 2% j 5% radial goalpost lancet z-form b f1 f2 -f2 < 1.4mm 6 6 figure 1 c
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