toll free: (888) sei-seis www.seielect.com email: marketing@seielect.com 45 (888) 734-7347 sm/ smx series ? surface mount - wirewound/ film * zero ohm available on all sizes . features sm - wirewound element smx - metal oxide element ? high temperature molded encapsulat ion ? smx: economical smt 2 and 3watt ? flex termination for absorbing thermal ex pansion ? smx extends value range up to 470k ? all welded construction ? both are rohs compliant/ lead-free ? available in non-inductive styles electrical specifications type power rating (watts) @ 70c maximum working voltage resistance temperature coefficient ohmic range and tolerance 0.1% & 0.5% 1% 5% sm 1 1w 25 100 ppm/c 20 ppm/c 0.01 ? ? 10 ? * 10 ? ? 1k 0.01 ? ? 10 ? * 10 ? ? 1k 0.01 ? ? 10 ? * 10 ? ? 1k sm 2 2w 50 100 ppm/c 20 ppm/c 0.01 ? ? 10 ? * 10 ? ? 2k 0.01 ? ? 10 ? * 10 ? ? 2k 0.01 ? ? 10 ? * 10 ? ? 2k smx 2 2w 350 200 ppm/c ? 2.0k ? 100k 2.0k ? 470k sm 2a 2w 60 100 ppm/c 0.005 ? ? 0.976 ? * 0.005 ? ? 0.976 ? * 0.005 ? ? 0.976 ? * sm 3 3w 100 100 ppm/c 20 ppm/c 0.01 ? ? 10 ? * 10 ? ? 3.01k 0.01 ? ? 10 ? * 10 ? ? 3.01k 0.01 ? ? 10 ? * 10 ? ? 3.01k smx 3 3w 500 200 ppm/c ? 3.01k ? 118k 3.01k ? 470k mechanical specifications type a body length b total length c body height d body width e termination width f termination length units tolerance 0.015 0.032 0.015 0.015 0.015 0.015 0.4 0.81 0.4 0.4 0.4 0.4 sm 1 0.260 6.6 0.280 7.1 0.140 3.6 0.150 3.8 0.090 2.3 0.100 2.5 inches mm sm/ smx 2 0.410 10.4 0.435 11.1 0.180 4.6 0.240 6.1 0.100 2.5 0.115 2.9 inches mm sm 2a 0.475 12.1 0.500 12.7 0.140 3.6 0.305 7.8 0.110 2.8 0.115 2.9 inches mm sm/ smx 3 0.629 16.0 0.708 18.0 0.256 6.5 0.276 7.0 0.110 2.8 0.115 2.9 inches mm how to order sm 2 1k 1% r sei type code nominal resistance tolerance packaging type element code size tolerance series code description pkg qty sm wirewound 1 2815 0.1% sm 1 r 13" reel 1,500 smx metal oxide 2 4424 0.5% sm 2, smx 2 r 13" reel 800 2a 5031 1% sm 2a r 13" reel 1,200 3 7128 5% sm 3, smx 3 r 13" reel 750
toll free: (888) sei-seis www.seielect.com email: marketing@seielect.com sm/ smx series ? surfac e mount - wirewound/ film 46 (888) 734-7347 performance characteristics test sm test results smx test results moisture resistance 1.0% 1.5% thermal shock 0.5% 1.0% load life @70c ? 1,000 hrs. 1.0% 5.0% shock and vibration 1.0% 1.0% resistance to soldering heat 1.0 1.0 terminal strength 0.5% 0.5% dielectric withstanding voltage 0.001%/v 0.001%/v short time overload 0.5% 0.75% low temperature operation 0.5% 0.5% operating temperature range -55 c to +275 c-55 c to +155 c
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