bulk metal ? foil technology ultra high precision trimming potentiometers 3 / 4 " rectilinear, 5 ppm/c and 15 ppm/c tcr with a smooth and unidirectional output accutrim? 1280G, 1285g vishay foil resistors document number: 63056 for any questions, contact: foil@vishaypg.com www.foilresistors.com revision: 25-mar-10 1 introduction vishay foil precision trimmers have the bulk metal ? foil resistive element which possesses a unique inherent temperature and load life st ability. plus, their advanced virtually back lash-free adju stment mechanism makes them easy to set quickly and accurately and keeps the setting exactly on target. features ? temperature coefficient of resistance (tcr): (- 55 c to + 125 c ref. at + 25 c) - 15 ppm/c (model 1280G); - 5 ppm/c (model 1285g) 3) ; - through the wiper 50 ppm/c ? a smooth and unidirectional resistance with leadscrew adjustment ? load life stability: 0.5 % maximum r under full rated power at + 25 c for 2000 h ? electrostatic discharge (esd) up to 25 000 v ? settability: 0.05 % typical; 0.1 % maximum ? setting stability: 0.1 % ty pical; 0.5 % maximum, ss ? power rating: 0.75 w at + 25 c ? resistance range: 10 to 20 k ? resistance tolerance: 10 %, 5 % ? backlash: < 0.05 % ? tap test: 0.05 % typical; 0.1 % maximum ? ?o?-ring prevents ingress of fluids during any board cleaning operation ? terminal finish: gold plated (tin/lead finish available on request) notes (1) 5 % available on special order (2) the 1280G can be screened for low noise, if required (3) for model 1285g 10 and 20 tcr is 10 ppm/c (4) panel mount avail able on special order wiper travel resistance bulk metal foil wirewound wiper travel resistance cermet wiper travel resistance table 1 - 1280G and 1285g series electrical specifications resistance tolerance model 1280G 10 % (1) , model 1285g 5 % resistance range 10 to 20 k tcr model 1280G 15 ppm/c (- 55 c to + 125 c, ref. + 25 c) tcr model 1285g (3) 5 ppm/c (- 55 c to + 125 c, ref. + 25 c) power 0.75 w at + 25 c derated linearly to 0 w at + 125 c (see fig. 2) settability 0.05 % typical; 0.1 % maximum setting stability 0.1 % typical; 0.5 % maximum roll-on, roll-off 0.25 % typical; 1.0 % maximum load life stability 0.5 % r after 2000 h under full rated power at + 25 c end resistance 2 maximum c.r.v. (noise) (2) 3 typical; 10 maximum frequency characteristics 10 ns rise time at 1 k to 100 mhz table 2 - standard value 10 , 20 , 50 , 100 , 200 , 500 , 1 k , 2 k , 5 k , 10 k , 20 k
accutrim? 1280G, 1285g vishay foil resistors www.foilresistors.com for any questions, contact: foil@vishaypg.com document number: 63056 2 revision: 25-mar-10 table 3 - 1280G and 1285g series mechanical specifications adjustment turns 26 2 turns backlash < 0.05 % stops clutch, wiper idles sealed + 85 c water immersion torque 5 oz. in. maximum weight 1.5 grams maximum construction case material lead screw wiper rider block element lead material valox ? brass precious metal brush nylon bulk metal ? foil gold plated phosphor bronze figure 1 - 1280G/1285g schematic and dimensions in inches (millimeters) tolerances: a = 0.005" (0.13 mm) b = 0.010" (0.25 mm) c = 0.015" (0.38 mm) figure 2 - power derating curve 0.125" (3.1 8 mm) b 2 3 1 c w 0.750" (19.05 mm) c 0.010" (0.25 mm) a 0.050" (1.27 mm) a 0.039" (0.99 mm) a 0.020" (0.51 mm) a 0.500" (12.70 mm) a 0.200" (5.0 8 mm) a 0.200" (5.0 8 mm) b 0.190" (4. 8 3 mm) b 0.110" (2.79 mm) a 0.270" (6. 8 6 mm) b 0.060" (1.52 mm) a 23 1 0.190" (4. 8 3 mm) b 0.100" (2.54 mm) b 0.010" (0.25 mm) a 0.030" (0.76 mm) a 0.030" (0.76 mm) a + 150 + 125 + 100 + 75 + 50 - 75 0 + 25 + 50 + 75 + 100 ambient temperature (c) percent of rated power + 25 0 - 25 - 50 - 55 c + 25 c
accutrim? 1280G, 1285g vishay foil resistors document number: 63056 for any questions, contact: foil@vishaypg.com www.foilresistors.com revision: 25-mar-10 3 note (1) for non-standard requests or additional values, please c ontact application engineering. table 4 - global part number information new global part number: y0056100r000k0l (preferred part number format) denotes precision value characteristics (1) yr = k = k 0 = gold plated termination (lead (pb)-free) 1 to 999 = custom product code resistance tolerance packaging 0056 = 1280G 0059 = 1285g j = 5.0 % k = 10.0 % l = foam/box pack for example: above global order y0056 100r000 k 0 l: type: 1280G values: 100.0 absolute tolerance: 10 % termination: gold plated (lead (pb)-free) packaging: foam/box pack historical part number: 1280G 100r k (will continue to be used) 1280G 100r k model value tolerance 1280G 1285g 100r = 100 j = 5.0 % k = 10.0 % 0561 0r0 0 y0 00 0 l k
vishay precision group document no.: 63999 revision: 27-apr-11 www.vishaypg.com 1 legal disclaimer notice all products, product specifications and data are subject to change without notice. vishay precision group, inc., its affliates, agents, and employees, and all persons acting on its or their behalf (collectively, vishay precision group), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. the product specifcations do not expand or otherwise modify vishay precision groups terms and conditions of purchase, including but not limited to, the warranty expressed therein. vishay precision group makes no warranty, representation or guarantee other than as set forth in the terms and conditions of purchase. to the maximum extent permitted by applicable law, vishay precision group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of ftness for particular purpose, non-infringement and merchantability. information provided in datasheets and/or specifcations may vary from actual results in different applications and performance may vary over time. statements regarding the suitability of products for certain types of applications are based on vishay precision groups knowledge of typical requirements that are often placed on vishay precision group products. it is the customers responsibility to validate that a particular product with the properties described in the product specifcation is suitable for use in a particular application. no license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by any conduct of vishay precision group. the products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay precision group products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay precision group for any damages arising or resulting from such use or sale. please contact authorized vishay precision group personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners. legal disclaimer notice disclaimer document no.: 63999 revision: 27-apr-11
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