dimensions of standard styles (mm) & weight (g) wrap around planar style l w t a b* c wt 0805 2.0 0.3 1.25 0.2 0.6 0.3 0.15 0.9min 0.3 0.1 0.009 1005 2.5 0.3 1.25 0.2 0.7 not available 0.4 0.15 0.015 1206 3.2 0.4 1.6 0.2 0.7 0.4 0.2 1.7min 0.4 0.15 0.020 precision thick film surface mounted resistors pcr series tolerance down to 0.1% excellent load stability termination available for wire bonding or soldering resistance range 10 ohms to 1m ohms any resistance value available within specified range general note welwyn components reserves the right to make changes in product specification without notice or liability. all information is subject to welwyn s own data and is considered accurate at time of going to print. ?welwyn components limited ?bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 ?facsimile: +44 (0) 1670 829465 ?email: info@welwyn-tt.com ?website: www.welwyn-tt.com electrical data issue d ?08.04 a subsidiary of tt electronics plc welwyn components pcr0805 pcr1005 pcr1206 notes power rating at 70? watts 0.1 0.125 0.25 resistance range ohms 10r to 1m limiting element voltage volts 100 150 200 tcr -55? to +155? ppm/? 100 tcr +20? to +70? ppm/? 50 resistance tolerance % 0.1, 0.25, 0.5, 1 values e24 & e96 preferred any value to order thermal impedance ?/watt 360 290 200 for 10 devices mounted on a 50 x 25 mm p.c.b. area ambient temperature range* ? -55 to 155 physical data *see application notes 33 t w a a b l wrap-around terminations (3 faces) t w l planar terminations c c *this dimension determines the number of conductors which may pass under the surface mounted device. construction thick film resistor material, overglaze and organic protection are screen printed on a 96% alumina substrate. adjustment the components are adjusted to final value using a specially developed technique, which assures optimum load stability performance. terminations planar (or single-sided) termination is gold and suitable for wire-bonding; wrap around is suitable for soldering. solderability wrap-around terminations have an electroplated nickel barrier and solder coating, this ensures excellent ?each?resistance properties and solderability. they will withstand immersion in solder at 260? for 30 seconds. alternative styles for surface mounting resistors pcr_d.qxd 8/9/04 3:54 pm page 1
precision thick film surface mounted resistors pcr series ? welwyn components limited bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com website: www.welwyn-tt.com issue d 08.04 welwyn components 34 lacipyt mumixam load at rated power: 1000 hours at 70c ? r% 10 - 25k: 0.10 10 - 25k: 0.05 >25k - 1m: 0.4 >25k - 1m: 0.2 load at rated power: 8000 hours at 70c ? r% 10 - 25k: 0.20 10 - 25k: 0.10 >25k - 1m: 0.80 >25k - 1m: 0.4 load at 50% rated power: 1000 hours at 70c ? r% 10 - 1m: 0.10 10 - 1m: 0.03 load at 50% rated power: 8000 hours at 70c ? r% 10 - 1m: 0.20 10 - 1m: 0.06 shelf life: 12 months at room temperature ? 10.0 50.0 %r c551 ta orez c07 ta rewop detar morf gnitared overload ? 40.0 %r dry heat: 1000 hours at 155c ? 40.0 1.0 %r long term damp heat ? 40.0 1.0 %r temperature rapid change ? 10.0 30.0 %r resistance to solder heat ? 20.0 01.0 %r 005 stlov foorp egatlov operating temperature range the chips can operate at a maximum temperature of 155c (see performance data). for soldered chips, the joint temperature should not exceed 110c. this condition is met when the stated power levels at 70c are used. mounting this chip resistor is ideally suited for handling by automatic methods due to its rectangular shape and the small dimensional tolerances. electrical connection to a ceramic substrate or to a printed circuit board can be made by wire bonding (eg suffix ?g? in pcr0805g) or by reflow soldering of wrap-around terminations (eg suffix ?f? in pcr0805f). the ?f? terminations provide good leach properties and ensure reliable contact. due to the robust construction the resistor chip can be immersed in the solder bath for 30 seconds at 260c. this enables the resistor to be mounted on one side of a printed circuit and other wire-leaded components on the other side. performance data 1.0 52.0 5.0 1 %.lot/ezis pcr0805 10 to 1m 10 to 1m 100 to 1m 100 to 1m pcr1005 10 to 1m 10 to 1m 100 to 1m 100 to 1m pcr1206 10 to 1m 10 to 1m 100 to 1m 100 to 1m value ranges application notes packaging resistor chips are supplied taped and reeled on standard 8mm tape to iec 286-3. quantity per reel 3000 max. planar terminations resistor chips are supplied in waffle packs. pcr_d.qxd 8/9/04 3:54 pm page 2
precision thick film surface mounted resistors pcr series ? welwyn components limited bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com website: www.welwyn-tt.com issue d 08.04 welwyn components 34 pcr_d.qxd 8/9/04 3:54 pm page 2 ordering procedure example: pcr0805 with solderable wraparound terminations at 10 kilohms and 0.1% tolerance packed on a reel of up to 3000 pieces - p c r 0 8 0 5 f ? 1 0 k b i type termination f solderable wraparo und 0805 & 1206 only g gold pad planar all sizes value (use iec62 code) tolerance (use iec62 code) b 0.1% c 0.25% d 0.5% packing i tape 0805f, 1206f up to 3000/reel standard waffle g termination
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