www.vishay.com 60 NKS. vishay draloric document number 20124 revision 02-aug-02 for technical questions, contact ff1aresistors@vishay.com metal film resistors, fusible type features fusible resistor for constant current designed for overload protection high positive temperature coefficient flame retardent coating defined switch-off behaviour NKS2 - 10r 10% a5 model tc resistance tolerance packaging ppm/k value ? % a5 ammopack -5000 pcs ordering information parameter unit NKS2 NKS3 NKS4 NKS5 NKS8 rated dissipation at 70 c w 0.4 0.5 0.7 1.0 1.5 minimum overload to fuse w 1.5 2.0 2.8 5 8 time to fuse (max) s 30 40 60 110 200 voltage coefficient 1 / v < 10 -7 thermal resistance k/w 220 180 130 80 60 thermal time constant s 8 11 20 35 70 category temperature range c - 55 / + 155 failure rate 10 -9 /h < 30 weight g 0.2 0.36 0.7 1,5 3,3 technical specifications ? further values on request ? coating: red-brown ? marking: additional 5 th band, black ? rated voltage p x r model din power rating temperature tolerance resistance e-series size p 70?c coefficient range w ppm/k % ? NKS2 0207 0.4 see diagram 5 1r0 - 20r 12 - 24 10, 20 r10 - 20r 12 NKS3 0309 0.5 see diagram 5 1r0 - 20r 12 - 24 10, 20 r10 - 20r 12 NKS4 0414 0.7 see diagram 5 1r0 - 20r 12 -24 10, 20 r10 - 20r 12 NKS5 0617 1.0 see diagram 5 1r0 - 20r 12 - 24 10, 20 r10 - 20r 12 NKS8 0922 1.5 see diagram 5 1r0 - 20r 12 - 24 10, 20 r10 - 20r 12 standard electrical specifications
www.vishay.com 61 NKS vishay draloric document number 20124 revision 02-aug-02 for technical questions, contact ff1aresistors@vishay.com model reel box min. order qty min. order qty pieces / reel code packaging units pieces / box code packaging units NKS2 / NKS3 5000 r5 1 5000 a5 1 2000 a2 2 NKS4 2500 re 1 1000 a1 1 NKS5 1500 rp 1 1000 a1 1 NKS8 1000 r1 1 1000 a1 1 packaging dimensions ?taping in acc. with iec60286-1 ?d and l measured in acc. with iec60294 ?d according to iec60301 1) also available in 26mm tape spacing * 9mm for NKS5, NKS8 model dimensions [in millimeters] dll 1max bd e NKS2 2.5 -0.5 6.0 -0.5 7.0 53 1 1) 0.6 7.5 NKS3 3.2 -0.5 8.5 -1.0 9.5 53 1 1) 0.6 10.0 NKS4 4.1 -0.5 12.0 -1.5 14.0 73 1) 0.8 15 NKS5 6.0 -0.5 16.5 -1.5 18.5 77 1 0.8 17.5 NKS8 9.0 -0.5 20.5 -1.5 22.5 77 1 0.8 22.5 metal film resistors, fusible type fusing performance time to fuse (secs) 100 0 1.5 2 2.8 4 6 70 50 30 20 10 7 5 3 2 1 0.7 0.5 opening power in watts calculated with rated resistance NKS4 NKS2 NKS3 time to fuse (secs) opening power in watts calculated with rated resistance 100 4 6 8 10 12 14 16 18 20 22 2 4 70 50 30 20 10 7 5 3 2 1 0.7 0.5 200 NKS5 NKS8 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 NKS8 NKS5 NKS4 NKS3 NKS2 power rating watts 0 50 100 150 ambient temperature in ?c derating 6000 5000 4000 3000 2000 1000 0.1 ? 1 ? 10 ? 20 ? temperature coefficient 10 -6 /k resistance value ? temperature coefficient l 1 l d d e 6 mm* 70 b
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