1/3 www.rohm.com c 2010 rohm co., ltd. all rights reserved. 2010.06 - rev.e high power chip resistors ltr18 (3216 size : 1 / 2w) ? features 1) mproved welding strength the structure of longer electrodes provides 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. 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 specification sheet before using or ordering it. 0.5w (1 / 2w) ? 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 .
2/3 www.rohm.com c 2010 rohm co., ltd. all rights reserved. 2010.06 - rev.e data sheet ltr18 200 table 1 r esistance tolerance resistance range ( ) resistance temperature coefficien t (ppm/ c) j ( 5%) 1 to 1m (e24) 10 to 1m (e24) 100 100 f ( 1%) d ( 0.5%) ? 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 comp onent in the mounted state. in addition, the reliability and performance of this component cannot be guaranteed if it is used with a st eady state voltage that is gr eater 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. 2010.06 - rev.e data sheet ltr18 ? 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 3.2 0.15 1.6 0.15 0.3 0.2 0.5 0.2 1.6 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 abcd 13 0.2 p 0 p 2 p 1 e f w t 2 d 0 a 0 label reel taping eiaj et-7200b compliant thick paper mount (underside paper tape) chip resistor square punchout hole heat crimp cover/tape 180 0 ? 1.5 60 +1 0 9 +1.0 0 1.5 +0.1 0 1.65 + 0.2 ? 0.1 2.4 + 0.2 ? 0.1 (unit: mm) (unit: mm) wf ea 0 b 0 d 0 p 0 p 1 p 2 t 2 8.00.3 3.50.05 1.750.1 4.00.1 4.00.1 2.00.05 max. 1.1 b 0 ? part designation t lr18 part no. e 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 ezp paper tape (4mm pitch) 180mm (7inch) ltr18 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)
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