VCS232 Vishay Foil Resistors Ultra High Precision Foil Power Current Sensing Resistor with Absolute TCR of 2 ppm/C, ESD Immunity up to 25 kV and Tolerance of 0.02 %, Power Rating up to 2 W FEATURES Temperature coefficient of resistance (TCR): 2 ppm/C typical (- 55 C to + 125 C, + 25 C ref.) Power rating at + 25 C: 2 W (free air) INTRODUCTION Tolerance: to 0.02 % Load life stability: to 0.01 %, 25 C for 2000 h at rated Vishay Foil has developed a new resistor concept, through power the use of a proprietary Bulk Metal Foil and new Maximum current: 3 A nanometer-level photo-etching techniques created by the Resistance range: 0.2 to 500 company so that the conductor can closely approximate a Vishay Foil resistors are not restricted to standard values flat wire. Because the metals used are not drawn, wound or specific as required values can be supplied at no extra mistreated in any way during the manufacturing process, cost or delivery (e.g 100.234 vs. 100 ) Vishay Foil resistors maintain all their design, physical and Electrostatic discharge (ESD) up to 25 000 V electrical characteristics. These characteristics are both Short time overload 0.005 % measurable and predictable before, during and after Non-inductive, non-capacitive design manufacturing. Rise time: 1 ns effectively no ringing Thermal stabilization < 1 s Through the entire process, every step is carefully controlled Current noise < - 40 dB not only to keep the metal in its virgin state, but also to Thermal EMF: 0.05 V/C eliminate the effects of any stress that might be imposed Voltage coefficient < 0.1 ppm/V either during manufacture or use. Non-inductive: 0.08 H Non hot spot design TABLE 1 - TOLERANCE AND TCR Terminal finish: lead (Pb)-free or tin/lead alloy Compliant to RoHS directive 2002/95/EC TIGHTEST RESISTANCE TYPICAL TCR AND RESISTANCE For better performances please contact us RANGE MAX. SPREAD TOLERANCE (1) Prototype quantities available in just 5 working days () (ppm/C) (%) or sooner. For more information, please contact foil vishaypg.com 0.2 to < 1.0 0.05 2 13 > 1 to 10 0.05 2 3 APPLICATIONS > 10 to 500 0.02 2 3 Automatic test equipment (ATE) High precision instrumentation Notes (1) - 55 C to + 125 C, + 25 C ref. Electron beam application Contact applications engineering for other available values Current sensing applications Pulse applications FIGURE 1 - POWER DERATING CURVE Military Power amplifier - 55 C + 25 C Power supplies + 100 + 75 + 50 R + 25 I I 0 - 50 0 + 50 + 100 + 150 + 200 Ambient Temperature (C) I E E I 1 1 2 2 (Further Derating Not Necessary) V * Pb containing terminations are not RoHS compliant, exemptions may apply Document Number: 63151 For any questions, contact: foil vishaypg.com www.foilresistors.com Revision: 29-Mar-10 1 D IMPROVED PRO UCT P e r c e n t o f R a t e d P o w e r VCS232 Vishay Foil Resistors FIGURE 2 - TRIMMING TO VALUES FIGURE 3 - TYPICAL RESISTANCE/ TEMPERATURE CURVE (Conceptual Illustration) + 150 + 100 Current Path Interloop Capacitance Before Trimming + 50 Reduction in Series 2 ppm/C (+ 25 C Reference) R 0 Current Path R After Trimming - 50 (ppm) Mutual Inductance Trimming Process Reduction due Removes this Material - 100 to Change in from Shorting Strip Area Current Direction Changing Current Path - 150 and Increasing Resistance - 200 - 50 - 25 0+ 25 + 50 + 75 + 100 + 125 Ambient Temperature (C) Note: Foil shown in black, etched spaces in white FIGURE 4 - DIMENSIONS in inches (millimeters) L W H D 2 LL D 1 LS Tin/Lead or Lead (Pb)-free Solder coated copper leads LT L H W LL LS LT D D 1 2 MODEL MAX. MAX. MAX. MIN. 0.20 ( 0.5) 0.20 ( 0.5) NOM. NOM. VCS232 1.240 (31.50) 0.512 (13.00) 0.177 (4.50) 0.500 (12.70) 0.688 (17.48) 1.083 (27.51) 0.040 (1.02) 0.032 (0.81) TABLE 2 - VCS232 PERFORMANCE SPECIFICATIONS TEST MIL-PRF-49465B TYPICAL MAXIMUM CONDITIONS (Conditions per MIL-PRF-49465) R LIMITS R LIMITS R LIMITS Thermal Shock - 55 C to + 125 C, 5 cycles (0.5 % + 0.0005R) 0.01 % 0.02 % Short Time Overload 5 x rated power for 5 s (0.5 % + 0.0005R) 0.005 % 0.01 % Resistance to Soldering Heat 10 s to 12 s at + 260 C (0.25 % + 0.0005R) 0.01 % 0.02 % Terminal Strength Pull test at 5 lb (1.0 % + 0.0005R) 0.002 % 0.005 % High Temperature Exposure 2000 h, + 150 C (1.0 % + 0.0005R) 0.01 % 0.02 % Low Temperature Storage MIL-PRF-49465, 24 h at - 55 C (0.5 % + 0.0005R) 0.002 % 0.005 % MIL-STD-202, method 106, + 65 C to - 10 C, Moisture Resistance (0.5 % + 0.0005R) 0.01 % 0.02 % 90 % to 98 % RH, rated power, 240 h Shock (Specified Pulse) 100 g, 6 ms (0.1 % + 0.0005R) 0.01 % 0.02 % Vibration (High Frequency) (10 Hz to 2000 Hz) 20 g (0.1 % + 0.0005R) 0.01 % 0.02 % Load Life Stability 2000 h, + 25 C at rated power (1.0 % + 0.0005R) 0.01 % 0.02 % Solderability MIL-STD-202 95 % coverage - - www.foilresistors.com For any questions, contact: foil vishaypg.com Document Number: 63151 2 Revision: 29-Mar-10 IMPROVED PRODUCT