wire and film technologies 736 greenway road po box 1860 boone, north carolina 28607-1860 tel: 704-264-8861 fax: 704-264-8865 1 iso-9001 registered d (lead diameter) 0.020 (0.53) 0.032 (0.81) 0.020 (0.5) 0.020 (0.5) 0.020 (0.5) 0.025 (0.64) 0.025 (0.64) 0.032 (0.8) 0.032 (0.8) 0.032 (0.8) 0.032 (0.8) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) d c a 1.50 min. (38.1) b semi-precision power wirewound as series 1/2 watt to 10 watts 5%, 3%, 1%, .5% tolerance 0.1 ohm to 175k ohms resistance wire tcr 20 ppm/c as-sm for surface mount capabilities. see surface mount section of this catalog for details. manufactured in barbados specifications: inductance of as-1/2 is less than 1h at 1mhz. * typical inductan ce of as-1c <5 ohms is < 1h. to order non-inductive types, add the prefix "n". example: nas-1, nas-2c, etc. lower values available upon reque st. as dimensions (inches and (mm)) : las-1 1.475 las-3 1.403 note: coating and marking is resistant to normal freon degreasing. consult factory for special requirements. heat conducting ceramic substrate alpha - digital marking silicone conformal coating all welded cap and lead assembly alloy resistance wire wound to specific parameters including tcr's from 20 to +5500 ppm/c equivalent mil-r-26 style rw81 rw70u rw-69v/ rw79u rw74u/ rw67v rw68v/ rw78u power rating 275c max. hot spot (watts) commercial range (ohms) non-inductive range (ohms) available resistance (ohms) 125c 1 2 0.5 0.5 1 1 2 3 2 3 5 7 10 25c 2 3 1 1 2 2 3 4 3 5 7 9 14 min. 0.1 0.1 0.1 0.1 0.1 .05 0.1 0.1 0.1 0.1 0.1 0.1 0.1 max. 7.5k 18k 1.0k 6.0k 7.5k 2k 20k 24k 18k 30k 60k 90k 175k min. 0.1 0.2 * * 0.1 * 0.5 0.5 0.2 0.5 0.8 1.0 3.0 max. 3.8k 7.5k * * 3.8k * 10k 12k 7.5k 15k 30k 45k 50k 0.5%, 1% 1-7.5k 1-18k 1-1k 1-6k 1-7.5k 1-2k 1-20k 1-24k 1-18k 1-30k 1-60k 1-90k 1-175k 3%, 5% 0.1-6k 0.1-18k 0.1-1k 0.1-6k 0.1-7.5k .05-2k 0.1-20k 0.1-24k 0.1-18k 0.1-30k 0.1-60k 0.1-90k 0.1-175k irc type las-1 las-3 as-1/4 as-1/2 as-1 as-1c as-2 as-2b as-2c as-3 as-5 as-7 as-10 a 0.032 0.348 (8.84) 0.491 (12.47) 0.250 (6.4) 0.312 (7.9) 0.367 (9.3) 0.256 (6.5) 0.480 (12.2) 0.540 (13.7) 0.489 (11.0) 0.687 (17.5) 0.875 (22.2) 1.250 (31.8) 1.812 (46.0) *leads 60/40 are solder plated. as-1c leads are copper. all others are 40% conductivity copper sheathed steel. b (max) 0.110 (2.80) 0.149 (3.80) 0.094 (2.4) 0.094 (2.4) 0.125 (3.2) 0.115 (2.9) 0.250 (6.3) 0.219 (5.6) 0.157 (4.0) 0.282 (7.2) 0.344 (8.8) 0.344 (8.8) 0.385 (9.8) c (max) 0.407 (10.34) 0.550 (13.99) 0.312 (7.9) 0.375 (9.5) 0.429 (10.9) 0.303 (7.7) 0.600 (15.2) 0.663 (16.6) 0.594 (15.1) 0.812 (20.6) 0.980 (24.9) 1.375 (35.0) 1.937 (49.2) irc type las-1 las-3 as-1/4 as-1/2 as-1 as-1c as-2 as-2b as-2c as-3 as-5 as-7 as-10
wire and film technologies 736 greenway road po box 1860 boone, north carolina 28607-1860 tel: 704-264-8861 fax: 704-264-8865 2 iso-9001 registered test condition load life 1000 hours moisture resistance temperature cycle short time overload low temperature operation solder heat shock vibration 25 75 125 175 225 275 0 75 100 125 150 175 200 as-1/4, 1/2, 1 as-3 as-2a, 2c as-2 as-5, 10 as-7, 25 0 40 80 120 160 200 50 100 150 200 250 275 as-7, 10 as-5 as-2a, 2c as-2 as-2b as-1/2 as-1/4 25 power derating: environmental testing: how to order: sample part no.: as-3 27 w w w w w 0.25% type power 3 =3 watts (see specification chart for other power ratings) resistance value expressed in ohms (standard eia/mil values tolerance 5%, 3%, 1%, 0.5% max d d d d d r 1.0% 1.0% 0.5% 0.5% 0.5% 0.25% 0.5% 0.5% temperature rise @ 125c: ambient temperature (c) percent of 125c power rating percent of 25c power rating hot spot temperature (c) temperature rise @ 25c: 0.1 0.2 0.5 1 2 5 10 0 2 4 6 8 10 12 14 as-2a as-3 as-2 as-2b as-1 as-2c as-1/2 as-1/4 selected pulse-handling capability @ 125c: resistance (ohms) energy (watts-second) 0 20406080100 125 150 200 250 275 as-7, 10 as-5 as-3, 2a, 2c as-2 as-2b as-1/2 as-1/4 percent of 125c power rating hot spot temperature (c) las-1 as-3, as-1, as-2 as-2b las-1 las-1, as-2b , las-3 las-3, ,las-1 as2a, as2c as-3, as-5 las-3 las-3
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