www.vishay.com n1 power current sense resistors v ishay foil resistors document number: 63086 revision 12-may-03 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 +81.3.5464.6411 fax: +81.3.5464.6433 ? 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 z-based bulk metal ? foil technology rapid ? r stabilization - low wcr - low tcr features ? rapid ? r stabilization under transient loads (see figure 1). ?t enfold improvement of wattage coefficient of resistance (wcr): 4ppm/w (see figure 2). ? low temperature coefficient of resistance: (see figure 3 and table 2). ? thermal resistance: 6 c/w. ? power rating: 10 watts on heat sink** at + 25 c (see table 2). 3 watts in free air at + 25 c (see table 2). ? load life stability: 0.05% maximum ? r, 10 watts on heat sink** at + 25 c, 2000 hours. 0.005% maximum ? r, 3 watts in free air at + 25 c, 2000 hours. ? current noise: < 0.01 v(rms)/volt of applied voltage. ? thermal emf: 0.1 v/ c maximum, 0.05 v/ c typical. ? non-inductive design vhp4z vpr247z vfp4z vcs331z vcs332z products may not be to scale rapid ? r stabilization under transient loads, low wattage coefficient (wcr), and low temperature coefficient (tcr) are features of this new z based bulk metal ? foil series of current sense resistors. the series should be selected where rapid ? r stabilization and resistance stability under transient power conditions is required. these products achieve optimum performance when mounted on a chassis or cooled heat sink. the z based t echnology provides extremely low wcr under defined conditions (see figure 1 and figure 2). the low absolute tcr provided by the z based technology is measured over the temperature range of - 55 c to + 125 c, +25 c reference (see figure 3). all of these devices utilizing the z based technology are provided with a true 4 terminal kelvin connection. this is a must for current sensing when the r-value is less than 100 ohms. the vhp4z and vpr247z types add the additional benefit of hermeticity. the welded construction and nitrogen backfill provide maximum protection against environmental stresses and insures long term stability. typical applications for this new series includes electron beam circuitry, electron microscopes, fire control radar display systems, high speed video display, deflection amplifier circuits, constant current power supplies and forced balance electronic scales. custom high power designs can be developed for your specific applications.
document number: 63086 revision 12-may-03 www.vishay.com n2 power current sense resistors v ishay foil resistors 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 +81.3.5464.6411 fax: +81.3.5464.6433 ? 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 z-based bulk metal ? foil technology rapid ? r stabilization - low wcr - low tcr 15 10 5 0 - 5 - 10 - 15 02040608 0 100 120 140 160 180 200 time in seconds resistance change under load at 10 watts mounted on cooled heat sink held at + 25 c figure 1 - rapid stabilization figure 2 - power coefficient (wcr) 60 40 20 0 - 20 - 40 - 60 01 25810 applied power in watts resistance change vs applied power mounted on cooled heat sink held at + 25 c resistance change, ppm ambient temperature ( c) no load applied figure 3 - temperature coefficient resistance figure 4 - power derating curve +100 +75 +50 +25 0 ?50 0 +50 +100 +150 +200 ambient temperature c percent of rated power ?55 c +25 c figure 5 - kelvin connection kelvin, 4-terminal, connections are utilized for these low ohmic value products to measure a precise voltage drop across the resistive element. in these applications the contact resistance, lead resistance, and their tcr effect may be greater than that of the element itself and could cause significant errors if the standard 2-terminal connection is used. figure 5 shows a high impedance measurement system where r 5 approaches infinity and i m approaches zero resulting in negligible ir drop through r 3 and r 4 which negates their lead resistance and tcr effect. with the voltage sense leads e 1 and e 2 inside of r 1 and r 2 the resistance and tcr effect of the current leads, i 1 and i 2 are negated and only the resistance and tcr of the element r are sensed. this method of measurement is essential for precise current sensing. 8 r 5 r 4 i m r 3 e 1 e 2 0 r 2 r 1 r i 1 i 2 resistance deviation, ppm resistance deviation, ppm + 8ppm/ c + 8ppm/ c + 200 - 200 - 55 + 25 + 125 - 250 - 200 - 150 - 100 - 50 0 50 100 150 200 250 + 2ppm/ c - 2ppm/ c + 2ppm/ c - 2ppm/ c
www.vishay.com n3 power current sense resistors v ishay foil resistors document number: 63086 revision 12-may-03 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 +81.3.5464.6411 fax: +81.3.5464.6433 ? 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 0.140 0.005 (3.56 0.13) (dia. thru hole) 0.690 0.005 (17.53 0.13) date code 10 w eek 01 y ear vishay vpr247z xxxx 0r2000 1% s ls t olerance resistance v alue gold plated copper leads 0.025 dia (0.633) i 1 e 1 e 2 i 2 0.010 (0.254) max sleeve extension 0.200 0.005 (5.08 0.13) 0.100 0.005 (2.54 0.13) 0.820 0.005 (20.83 0.13) 0.120 0.005 (3.05 0.13) 0.500 min (12.70) 0.120 0.005 (3.05 0.13) 0.125 0.005 (5.46 0.13) 0.040 0.005 (1.02 0.13) mounting hole 0.222 (5.64) e 1 e 2 i 1 i 2 standard marking arrangement model no. res. val. res. tol. date code ex: 98 02 year week vishay vhp-3z 21k500 0.01% 9802 e 1 e 2 i 1 i 2 t o-3 cap t o-3 base 0.040 (1.00) dia 0.005 ( 0.13 ) 0.43 (10.92) 0.01 ( 0.25) 1.00 (25.4) 0.005 ( 0.13) 0.770 (19.56) max dia 0.266 (6.76) 0.005 ( 0.13) 0.335 (8.51) 0.005 ( 0.13) 0.45 (11.43) min. 0.156 dia (3.9) 0.005 ( 0.13) 0.665 (16.89) 0.005 ( 0.13) 1.186 (30.13) 0.005 ( 0.13) 1.530 (38.86) 0.005 ( 0.13) 1.575 0.016 (40 0.4) 0.276 (7.0 ) 1.181 0.016 (30 0.4) e 2 e 1 i 2 i 1 0.197 (5) 0.150 0.004 (3.8 0.1) 0.394 0.008 (10 0.2) lead dia. 0.025 (0.633) solder coated copper 0.200 [x3] (5.08) 0.118 (3) 0.787 0.016 (20 0.4) 1.00 min. (25.4 min.) +0.004 +0.1 ?0.008 ?0.2 vishay vfp-4z (value) (tol.) (date code) vishay vcs331z 0r2000 1% b9825 1.340 0.008 (34.0 0.2) 1.083 0.20 (27.5 0.5) 0.138 (3.5) nominal 1.063 (27.0) maximum 0.689 0.020 (17.5 0.5) 0.040 (1.0) nominal 0.16 (0.4) nominal 0.701 0.008 (17.8 0.2) 0.197 0.008 (5.0 0.2) 0.040 (1.0) nominal 0.210 (5.33) maximum 0.087 (2.2) maximum 0.216 (5.5) minimum vishay vcs332z 8r2000 0.1% b9825 1.083 0.20 (27.5 0.5) 0.689 0.020 (17.5 0.5) 0.040 (1.0) nominal 0.701 0.008 (17.8 0.2) 0.210 (5.33) maximum 0.087 (2.2) maximum 1.00 (25.4) minimum 1.024 (26.0) maximum 1.340 0.008 (34.0 0.2) 0.197 0.008 (5.0 0.2) 0.138 (3.5) nominal 0.032 (0.8) nominal vhp4z vpr247z vfp4z vcs331z vcs332z figure 6 - standard imprinting and dimensions z-based bulk metal ? foil technology rapid ? r stabilization - low wcr - low tcr
document number: 63086 revision 12-may-03 www.vishay.com n4 power current sense resistors v ishay foil resistors 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 +81.3.5464.6411 fax: +81.3.5464.6433 ? 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 z-based bulk metal ? foil technology rapid ? r stabilization - low wcr - low tcr please specify vishay vhp4z, vpr247z, vfp4z, vcs331z, vcs332z series resistors as follows: example: vhp4z 500r00 0.01% model no. resistance value tolerance resistance value, in ? , is expressed by a series of 6 characters, 5 of which represent significant digits while the 6th is a dual purpose letter that designates both the multiplier and the location of the comma or decimal. resistance letter multiplier range designator factor example 0.25 to 500 ? rx 1 100r01 = 100.01 ? t able 3 - ordering information t able 2 - specifications test or condition performance w attage coefficient of resistance (wcr) 4ppm/watt maximum* t emperature coefficient of resistance (tcr) 1.0 ? to 500 ? , 2ppm/ c maximum (- 55 c to + 125 c, + 25 c reference) 0r25 to < 1.0 ? , 3ppm/ c maximum thermal resistance 6 c/watt* maximum ambient temperature rated power + 25 c zero power + 150 c power rating vhp4z 10 watts or 3 amps maximum (heat sink)**# @ + 25 c vpr247z vfp4z 3 watts or 3 amps maximum (free air)# vcs331z 10 watts or 5 amps maximum (heat sink)**# vcs332z 3 watts or 5 amps maximum (free air)# inductance 0.1 h maximum; 0.08 h typical v oltage coefficient < 0.1ppm/v current noise < 0.010 v(rms)/volt of applied voltage (- 40db) t able 1 - resistance value vs tolerance resistance range ( ? )s t andard tolerance (%) 10 to 500 0.01% 5 to < 10 0.02% 2 to < 5 0.05% 1 to < 2 0.1% 0.5 to < 1 0.25% 0.25 to < 0.5 0.5% *mounted on a cooled heat sink held at + 25 c **heatsink - aluminum (6? l x 4? w x 2? h x 0.04? thk) #whichever is lower
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