Power Current Sense Resistors Vishay Foil Resistors Z-Based Bulk Metal(R) Foil Technology Rapid R Stabilization - Low WCR - Low TCR VHP4Z VFP4Z VCS331Z VCS332Z VPR247Z Product 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(R) 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 Technology 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 . 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. FEATURES * Rapid R Stabilization under transient loads (see Figure 1) * Tenfold improvement of Wattage Coefficient of Resistance (WCR): 4 ppm/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 sink1) at + 25 C (see Table 2) 3 watts in free air at + 25 C (see Table 2) * Load Life Stability: 0.05 % Max R, 10 W on heat sink at + 25 C, 2000 hours 0.01 % Max R, 3 W on heat sink at + 25 C, 2000 hours 0.05 % Max R, 3 W 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 NOTE: 1.Heatsink - Aluminum (6" L x 4" W x 2" H x 0.04" THK) SALES * ASIA/JAPAN: foilsales.asia@vishay.com * UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com * AMERICAS: foilsales.usa@vishay.com * GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com * FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com * ISRAEL: foilsales.israel@vishay.com www.vishay.com 1 For technical questions, contact: foil@vishay.com Document Number: 63086 Revision: 02-Mar-05 Power Current Sense Resistors Z-Based Bulk Metal(R) Foil Technology Vishay Foil Resistors Rapid R Stabilization - Low WCR - Low TCR FIGURE 2 - POWER COEFFICIENT (WCR) 15 RESISTANCE DEVIATION, ppm RESISTANCE DEVIATION, ppm FIGURE 1 - RAPID STABILIZATION 10 5 0 -5 - 10 - 15 0 20 40 60 80 100 120 140 60 40 20 0 - 20 - 40 - 60 160 180 200 0 1 2 TIME IN SECONDS RESISTANCE CHANGE UNDER LOAD AT 10 WATTS MOUNTED ON COOLED HEAT SINK HELD AT + 25 C pp 100 50 + 200 C / C m / ppm m/ p + 82 C 0 - 50 - 100 - 150 +2 - 200 - 250 - 55 p / pm -2 C 10 pp FIGURE 4 - POWER DERATING CURVE - 55 C PERCENT OF RATED POWER RESISTANCE CHANGE, ppm -2 150 8 RESISTANCE CHANGE VS APPLIED POWER MOUNTED ON COOLED HEAT SINK HELD AT + 25 C FIGURE 3 - TEMPERATURE COEFFICIENT RESISTANCE 250 200 5 APPLIED POWER IN WATTS + 25 C + 100 + 75 + 50 + 25 0 m/ C - 200 - 50 0 + 50 + 100 + 150 + 200 AMBIENT TEMPERATURE + 25 + 125 AMBIENT TEMPERATURE (C) NO LOAD APPLIED FIGURE 5 - KELVIN CONNECTION R r1 I1 r2 I2 E2 E1 r4 r3 Im 0 8 r5 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 r5 approaches infinity and Im approaches zero resulting in negligible IR drop through r3 and r4 which negates their lead resistance and TCR effect. With the voltage sense leads E1 and E2 inside of r1 and r2 the resistance and TCR effect of the current leads, I1 and I2 are negated and only the resistance and TCR of the element R are sensed. This method of measurement is essential for precise current sensing. SALES * ASIA/JAPAN: foilsales.asia@vishay.com * UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com * AMERICAS: foilsales.usa@vishay.com * GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com * FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com * ISRAEL: foilsales.israel@vishay.com Document Number: 63086 Revision: 02-Mar-05 For technical questions, contact: foil@vishay.com www.vishay.com 2 Power Current Sense Resistors Vishay Foil Resistors Z-Based Bulk Metal(R) Foil Technology Rapid R Stabilization - Low WCR - Low TCR VHP4Z 0.770 (19.56) max dia Mounting Hole 0.222 (5.64) E1 E2 Standard Marking Arrangement VISHAY Model No. VHP-3Z Res. Val. 21K500 Res. Tol. 0.01 % Date Code 9802 Ex: 98 02 Year Week 0.45 (11.43) min. I2 TO-3 cap TO-3 base 0.665 (16.89) 0.005 ( 0.13) 1.186 (30.13) 0.005 ( 0.13) 1.530 (38.86) 0.005 ( 0.13) I1 0.266 (6.76) 0.005 ( 0.13) 0.335 (8.51) 0.005 ( 0.13) FIGURE 6 - STANDARD IMPRINTING AND DIMENSIONS 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) 0.156 dia (3.9) 0.005 ( 0.13) VPR247Z I1 I2 E1 E2 VFP4Z + 0.004 0.040 0.005 (1.02 0.13) 0.690 0.005 (17.53 0.13) 0.120 0.005 (3.05 0.13) 0.125 0.005 (5.46 0.13) 0.140 0.005 (3.56 0.13) + 0.1 0.276 - 0.008 (7.0 - 0.2 ) 1.575 0.016 (40 0.4) 0.118 (3) 0.197 (5) 1.181 0.016 (30 0.4) (Dia. Thru Hole) 0.820 0.005 (20.83 0.13) 0.010 (0.254) max Sleeve Extension VISHAY VPR247Z XXXX 0R2000 1 % Tolerance Resistance Value I E E I 0.200 0.005 1 1 2 2 (5.08 0.13) S 0.100 0.005 (2.54 0.13) LS Gold Plated Copper Leads 0.025 Dia (0.633) 0.120 0.005 (3.05 0.13) 0.787 0.016 (20 0.4) 0.394 0.008 (10 0.2) 0.500 Min (12.70) Lead Dia. 0.025 (0.633) Solder Coated Copper I1 E1 E2 1.00 Min. (25.4 Min.) I2 0.200 [x3] (5.08) VCS332Z 0.040 (1.0) NOMINAL 0.040 (1.0) NOMINAL 1.340 0.008 (34.0 0.2) 0.689 0.020 (17.5 0.5) 1.083 0.20 (27.5 0.5) 0.138 (3.5) NOMINAL 0.701 0.008 (17.8 0.2) 1.024 (26.0) MAXIMUM VISHAY VCS331Z 0R2000 1 % B9825 0.16 (0.4) NOMINAL 1.340 0.008 (34.0 0.2) 0.087 (2.2) MAXIMUM 0.210 (5.33) MAXIMUM 0.701 0.008 (17.8 0.2) VISHAY VCS332Z 8R2000 0.1 % B9825 0.040 (1.0) NOMINAL 0.216 (5.5) MINIMUM 0.197 0.008 (5.0 0.2) 0.138 (3.5) NOMINAL 0.087 (2.2) MAXIMUM 0.210 (5.33) MAXIMUM 0.197 0.008 (5.0 0.2) 0.032 (0.8) NOMINAL 0.689 0.020 (17.5 0.5) 1.083 0.20 (27.5 0.5) 1.00 (25.4) MINIMUM VCS331Z 1.063 (27.0) MAXIMUM 0.150 0.004 (3.8 0.1) VISHAY VFP-4Z (Value) (Tol.) (Date Code) Date Code 10 01 Year Week SALES * ASIA/JAPAN: foilsales.asia@vishay.com * UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com * AMERICAS: foilsales.usa@vishay.com * GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com * FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com * ISRAEL: foilsales.israel@vishay.com www.vishay.com 3 For technical questions, contact: foil@vishay.com Document Number: 63086 Revision: 02-Mar-05 Power Current Sense Resistors Z-Based Bulk Metal(R) Foil Technology Vishay Foil Resistors Rapid R Stabilization - Low WCR - Low TCR TABLE 1 - RESISTANCE VALUE VS TOLERANCE RESISTANCE RANGE () STANDARD TOLERANCE (%) 10 to 500 0.01 % 5 to < 10 0.02 % 2 to < 5 0.05 % 1 to < 2 0.10 % 0.5 to < 1 0.25 % 0.25 to < 0.5 0.50 % TABLE 2 - SPECIFICATIONS TEST OR CONDITION PERFORMANCE 4 ppm/Watt Maximum1) Wattage Coefficient of Resistance (WCR) 1.0 to 500 , 2 ppm/C Maximum 0R25 to < 1.0 , 3 ppm/C Maximum Temperature Coefficient of Resistance (TCR) (- 55 C to + 125 C, + 25 C Reference) 6 C/Watt1) Thermal Resistance Maximum Ambient Temperature Rated Power Zero Power Power Rating at + 25 C + 25 C + 150 C VHP4Z VPR247Z VFP4Z 10 Watts or 3 Amps Maximum (Heat Sink)2), 3) 3 Watts or 3 Amps Maximum (Free Air)3) VCS331Z VCS332Z 10 Watts or 5 Amps Maximum (Heat Sink)2),3) 3 Watts or 5 Amps Maximum (Free Air)3) 0.05 % Max R, 10 W on heat sink at + 25 C, 2000 hours 0.01 % Max R, 3 W on heat sink at + 25 C, 2000 hours 0.05 % Max R, 3 W in free air at + 25 C, 2000 hours Load Life Stability Inductance 0.1 H Maximum; 0.08 H Typical Voltage Coefficient < 0.1 ppm/V Current Noise < 0.010 V(RMS)/Volt of applied voltage (- 40 dB) NOTES: 1. Mounted on a cooled heat sink held at + 25C 2. Heatsink - Aluminum (6" L x 4" W x 2" H x 0.04" THK) 3. Whichever is lower TABLE 3 - ORDERING INFORMATION Please specify Vishay VHP4Z, VPR247Z, VFP4Z, VCS331Z, VCS332Z series resistors as follows: MODEL NO. VHP4Z RESISTANCE VALUE RESISTANCE RANGE 0.25 to < 500 TOLERANCE LETTER DESIGNATOR MULTIPLIER FACTOR R x1 0.01 % Example: 100R01 = 100.01 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. 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