1/3 www.rohm.com c 2010 rohm co., ltd. all rights reserved. 2010.09 - rev.f high power chip resistors ltr50 (5025 size : 1w) ? features 1) improved welding strength the structure of longer electrodes provi des the wider welding area than the chip resistors with normal electrodes, and this enhanced the solder welding strength. 2) increased surge-resistance this is achieved by rohm?s original trimming technology plus resistive element patterning. 3) high-power tolerance two times of the rated power is guarant eed than the normal-electrode resistors. 4) rohm resistors are iso-9001 & iso/ts16949 certified. ? applications automotive, industrial and power supply. ? ratings design and specifications are subject to change without notice. carefully check the specificati on sheet before using or orderin g it. 1w ? 55 c to + 155 c at 70 c item conditions specifications rated power rated voltage operating temperature nominal resistance see table 1. limiting element voltage 200v d( 0.5%) f( 1%) j( 5%) 0 20 40 60 80 100 ? 55 0 70 100 155 ambient temperature ( c) power load (%) fig.1 the voltage rating is calculated by the following equation. if the value obtained exceeds the limiting element voltage, the voltage rating is equal to the maximum operating voltage. e: rated voltage (v) p: rated power (w) r: nominal resistance ( ) e= p r power must be derated according to the power derating curve in figure 1 when ambient temperature exceeds 70 c . 200 table 1 r esistance tolerance resistance range ( ) resistance temperature coefficien t (ppm/ c) j ( 5%) 1 to 1m (e24) 10 to 130k (e24) 100 100 f ( 1%) d ( 0.5%)
2/3 www.rohm.com c 2010 rohm co., ltd. all rights reserved. 2010.09 - rev.f data sheet ltr50 ? before using components in circuits where they will be exposed to transients such as pulse loads (short?duration, high? level loads), be certain to evaluate the component in the mounted stat e. in addition, the reliability and performance of this compone nt cannot be guaranteed if it is used with a steady st ate voltage that is great er than its rated voltage. ? characteristics item test conditions (jis c 5201-1) resistor type guaranteed value resistance variation of resistance with temperature solderability damp heat, steady state endurance at 70 c endurance rapid change of temperature bend strength of the end face plating resistance to solvent resistance to soldering heat overload (2.0% + 0.1 ) (1.0% + 0.05 ) (3.0% + 0.1 ) j : 5% f : 1% d : 0.5% see table.1 no remarkable abnormality on the appearance. a new uniform coating of minimum of 95% of the surface being immersed and no soldering damage. without mechanical damage such as breaks. jis c 5201-1 4.5 jis c 5201-1 4.8 measurement : ? 55 / + 25 / + 125 c jis c 5201-1 4.18 soldering condition : 260 5 c duration of immersion : 10 1s. jis c 5201-1 4.24 40 c, 93%rh test time : 1,000h to 1,048h (3.0% + 0.1 ) (3.0% + 0.1 ) (1.0% + 0.05 ) (1.0% + 0.05 ) (1.0% + 0.05 ) jis c 5201-1 4.25.1 rated voltage (current), 70 c 1.5h : on ? 0.5h : off test time : 1,000h to 1,048h jis c 5201-1 4.25.3 155 c test time : 1,000h to 1,048h jis c 5201-1 4.29 23 5 c , immersion cleaning, 5 0.5mi n. solvent : 2-propanol jis c 5201-1 4.19 test temp. : ? 55 c to + 125 c 5cyc jis c 5201-1 4.33 jis c 5201-1 4.17 rosinethanol (25%wt) soldering condition : 235 5 c duration of immersion : 2.0 0.5s. jis c 5201-1 4.13 rated voltage (current) 2.5, 2s. maximum overload voltage : 200v static electric characteristics (5.0% + 0.05 ) eiaj ed-4701/300 test method 304 voltage : 3kv c : 100pf r : 1.5k apply cycle : 1 time
3/3 www.rohm.com c 2010 rohm co., ltd. all rights reserved. 2010.09 - rev.f data sheet ltr50 ? dimensions (unit : mm) no. material resistive element (oxide metal thick film) silver thick film electrode nickel electrode sn electrode alumina substrate overcoating (resin) 1 2 3 4 5 6 5.0 0.15 2.5 0.15 0.38 0.2 0.9 0.2 2.5 0.15 0.55 0.1 ? packaging 0 2 0 4 0 6 0 8 0 2 0 4 0 6 0 8 c abd label abcd reel taping a 0 p 1 p 0 p 2 b 0 f w k e d 0 eiaj et-7200b compliant (unit : mm) (unit : mm) wf ea 0 b 0 d 0 p 0 p 1 p 2 k 12.0 0.3 5.5 0.05 1.75 0.1 3.4 0.2 5.6 0.2 4.0 0.1 4.0 0.1 2.0 0.05 max. 1.1 13 +1.0 0 180 0 ? 1.5 60 +1 0 13 0.2 1.5 +0.1 0 ? part designation t lr50 part no. u z p j 5% resistance tolerance j 0.5% d 1% f nominal resistance f , d j : : 4 digits 3 digits resistance code, 3 or 4 digits. resistance tolerance resistance code uzp embossed tape (4mm pitch) 180mm (7inch) ltr50 r eel ( 180mm) : compatible with jeita standard "eiaj et-7200b" : standard product part no. resistance tolerance code packaging specifications reel p ackaging specifications code d( 0.5%) f( 1%) j( 5%) 5,000 basic ordering unit (pcs)
r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospac e machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.
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