document number: 63061 revision 05-feb-03 www.vishay.com 22 VSM0805 vishay foil resistors surface mount vishay foil ?france +33.4.93.37.28.24 fax: +33.4.93.37.27.31 ?germany +49.9287.710 fax: +49 9287.70435 ?israel +972.3.557.0945 fax: +972.3.558.9121 ?italy + 39.2.300.11919 fax: +39.2.300.11999 ?japan +81.42.729.0661 fax: +81.42.729.3400 ?singapore +65.788.6668 fax: +65.788.0988 ?sweden +46.8.594.70590 fax: +46.8.594.70581 ?uk +44 191 514 8237 fax: +44 1953 457 722 ?usa +1 610 407-4800 fax: +1 610 640-9081 bulk metal foil technology discrete surface mount chip resistors mil-prf-55342g vsm test characteristic. e maximum ? r limits ? r limits* thermal shock 0.10% 0.02% low temperature operation 0.10% 0.02% short time overload 0.10% 0.02% high temperature exposure 0.10% 0.05% resistance to bonding 0.20% 0.05% moisture resistance 0.20% 0.10% life 2000 hours @ + 70 c 0.50% 0.025% the VSM0805 represents the latest addition and smallest size to the precision bulk metal foil (bmf) technology surface mount chip resistor series. the VSM0805 has a conventional full wrap around termination. the bmf technology offers designers the lowest and most predictable absolute temperature coefficient resistance available. the tcr is a process capability not a selection process and for the most part is independent of ohmic value and lot related variations. the availability of tight absolute tolerance provides a good cost solution for the variability of other components when compiling the total error budget. bmf offers the best stability available; and is an order of magnitude better than thin film technology. the noise generated by the resistor is non measurable and its design and construction make it well suited for high frequency applications. the bmf is the ultimate resistor component for analog applications. value tightest ( ? ) tolerance (%)* 250 ? to 12k 0.01 100 ? to < 250 0.02 50 ? to < 100 0.05 25 ? to < 50 0.1 10 ? to < 25 0.25 5.5 ? to <10 0.5 features nominal tcr: + 0.6ppm/ c (0 to 25 c) - 0.6ppm/c (+ 25 c to + 60 c) + 2.2ppm/ c (- 55 c to + 25 c) - 1.8ppm/ c (+ 25 c to + 125 c) absolute tolerance: to 0.01% resistance range: 5.5 ? to 12k load life stability: 0.025% (2000 hours @ 70 c) shelf life stability: 0.005% maximum ? r voltage coefficient: < 0.00001%/volt (< 0.1ppm/v) current noise: < - 40db non inductive: < 0.08 h *as shown + 0.01 ohms to allow for measurement errors at low values. the tcr for values < 100 ? are influenced by the termination composition and result in a deviation from this curve. contact our application engineering department for detailed specification on low values table 1 - tolerance versus resistance value *tighter tolerances are available. please contact application engineering. soldering temperatures used during installation may cause resistance to shift up to 0.05%. table 2 - typical performance specifications figure 1 - nominal tcr curve product may not be to scale maximum spread 2.3 ppm/ c +125 ?5 ?0 ?5 0 +25 +50 +75 +100 +500 +400 +300 +200 +100 0 ?00 ?00 ?00 ?00 ?00 standard spread 2.0 ppm/ c +2.2 ppm/ c nominal chord slope (tcr) ?.8 ppm/ c nominal chord slope (tcr) ?5 c / +25 c / +125 c are the test points with +25 c as the reference temperature ? r r (ppm) nominal resistance/ temperature (rt) curve +5 ppm -5 ppm
www.vishay.com 23 VSM0805 vishay foil resistors document number: 63061 revision 05-feb-03 surface mount vishay foil ?france +33.4.93.37.28.24 fax: +33.4.93.37.27.31 ?germany +49.9287.710 fax: +49 9287.70435 ?israel +972.3.557.0945 fax: +972.3.558.9121 ?italy + 39.2.300.11919 fax: +39.2.300.11999 ?japan +81.42.729.0661 fax: +81.42.729.3400 ?singapore +65.788.6668 fax: +65.788.0988 ?sweden +46.8.594.70590 fax: +46.8.594.70581 ?uk +44 191 514 8237 fax: +44 1953 457 722 ?usa +1 610 407-4800 fax: +1 610 640-9081 bulk metal foil technology discrete surface mount chip resistors model chip size resistance value tolerance termination vsm 0805 resistance letter multiplier t 0.01% b - solderable range designator factor q 0.02% a 0.05% 5 ? to <1k ? r x 1.0 b 0.1% example: 249r00 = 249 ? c 0.25% d 0.5% f 1.0% t w l d t w l 1k to 12k ? k x 10 3 example: 10k000 = 10.0k ? figure 3 - recommended mounting chip power maximum resistance maximum size l w t d + 70 c voltage range weight z* g* x* 0.005 (0.13) 0.005 (0.13) maximum 0.005 (0.13) (mw) (v) ( ? )(mg) 0.004 (0.10) 0.004 (0.10) 0.004 (0.10) 0805 0.080 (2.03) 0.050 (1.27) 0.025 (0.64) 0.015 (0.38) 50 22 5.5 - 12k 6 0.122 (3.10) 0.028 (0.70) 0.050 (1.27) *land pattern dimensions (z, g, x) are per ipc-782a table 3 - chip sizes and specifications in inches (millimeters) table 4 - ordering information - vsm style chip resistors figure 2 - power derating curve 125 100 75 50 25 0 -75 ?0 ?5 0 +25 +50 +75 +100 +125 +150 +175 ambient temperature ( c) percent of rated power ?5 c +70 c rated power footprint g z x top view bottom view recommended land pattern 25% to 85% of t a low profile solder fillet is recommended to avoid unnecessary stresses along top edge of metallization. ir and vapor phase reflow are best. avoid the use of cleaning agents which could attack epoxy resins, which form part of the resistor construction.
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