VPR221SZ (Z-Foil) Vishay Foil Resistors Ultra High Precision Bulk Metal Z-Foil Surface Mount Power Resistor in TO-220 Configuration with TCR of 0.05 ppm/C, PCR of 4 ppm/W and Load Life Stability of 0.005 % (50 ppm) FEATURES Temperature coefficient of resistance (TCR): 0.05 ppm/C typical (0 C to + 60 C) 0.2 ppm/C typical (- 55 C to + 125 C, + 25 C ref.) (see table 1) Tolerance: to 0.01 % Power coefficient R due to self heating: 4 ppm/W typical Rated power: 8 W chassis mounted (MIL-PRF-39009) Load life stability: to 0.005 % at 25 C for 2000 h, at 1.5 W Resistance range: 0.5 to 500 Foil resistors are not restricted to standard values specific as requested values can be supplied at no extra cost or INTRODUCTION delivery (e.g. 100R2345 vs. 100R) Electrostatic discharge (ESD) up to 25 000 V The Z-Foil technology provides a significant reduction of the Short time overload 0.001 % (10 ppm) resistive components sensitivity to ambient temperature Non-inductive, non-capacitive design variations (TCR) and applied power changes (PCR). Rise time: 1 ns effectively no ringing Current noise: 0.010 V /V of applied voltage (< - 40 dB) RMS Model VPR221SZ is a 4 lead kelvin connected surface Thermal EMF: 0.05 V/C typical mount device which provides high rated power, excellent Voltage coefficient < 0.1 ppm/V Non-inductive: < 0.08 H load life stability, low temperature coefficient (TCR) and low Non hot spot design power coefficient (PCR) - all in one resistor. 0.05 ppm/C Thermal stabilization time < 1 s (nominal value achieved absolute TCR removes error due to temperature gradients. within 10 ppm of steady state value) Terminal finish: lead (Pb)-free or tin/lead alloy By taking advantage of the overall stability and reliability of Compliant to RoHS directive 2002/95/EC Bulk Metal Z-Foil resistors, designers can significantly Prototype quantities available in just 5 working days or sooner. For more information, please contact reduce circuit errors and greatly improve overall circuit foil vishaypg.com performances. For better performances please contact us Our application engineering department is available to FIGURE 1 - SCHEMATICS advise and make recommendations. For non-standard technical requirements and special applications, please R I I contact us. I E E I 1 1 2 2 V TABLE 1 - TCR AND TOLERANCE TIGHTEST FIGURE 2 - POWER DERATING CURVE RESISTANCE TYPICAL TCR AND RESISTANCE (1) RANGE () MAX. SPREAD - 55 C TOLERANCE 100 0.5 to < 1 0.05 % 0.2 ppm/C 2.8 ppm/C 75 1 to < 10 0.02 % 0.2 ppm/C 2.3 ppm/C 50 10 to 500 0.01 % 0.2 ppm/C 1.8 ppm/C 25 Notes (1) MIL-range (- 55 C to + 125 C, + 25 C ref.) 0 - 75 - 50 - 25 0 25 50 75 100 125 150 Contact applications engineering for other available values Ambient Temperature (C) * Pb containing terminations are not RoHS compliant, exemptions may apply Document Number: 63127 For any questions, contact: foil vishaypg.com www.foilresistors.com Revision: 16-Aug-12 1 P e r c e n t o f R a t e d P o w e r VPR221SZ (Z-Foil) Vishay Foil Resistors FIGURE 3 - TRIMMING TO VALUES FIGURE 4 - TYPICAL RESISTANCE/ (conceptual illustration) TEMPERATURE CURVE (for more details see table 1) TCR Chord Slopes for Different Temperature Ranges + 500 Interloop Current Path + 400 Capacitance Before Trimming Reduction + 300 in Series + 200 Current Path + 100 Mutual R After Trimming Inductance R 0 Reduction due Trimming Process (ppm) - 100 0.05 ppm/C to Opposing Removes this Material Current in - 200 from Shorting Strip Area - 0.1 ppm/C 0.1 ppm/C Adjacent Lines Changing Current Path - 300 0.14 ppm/C and Increasing Resistance - 400 - 0.16 ppm/C 0.2 ppm/C - 500 - 55 - 25 0 + 25 + 60 + 75 + 100 + 125 Note: Foil shown in black, etched spaces in white Ambient Temperature (C) FIGURE 5 - VPR221SZ FORMING FIGURE 6 - VPR221SZ DIMENSIONS DIMENSIONS in inches (millimeters) in inches (millimeters) 0.365 (9.27) Ref. 0.400 0.010 0.015 0.002 0.150 0.008 (0.38 0.05) (10.16 0.25) (3.81 0.20) 0.050 0.005 0.150 0.008 (1.27 0.13) 0.115 0.005 (3.81 0.20) 0.078 0.005 0.245 0.010 0.050 0.005 (2.92 0.13) (1.98 0.13) (6.22 0.25) (1.27 0.13) 0.615 Max. Before Forming VFR (15.62) VPR221SZ 0.141 0.005 Dia. 1R0 1 % (3.58 0.13) 0101 0.200 0.030 0.695 0.010 0.050 0.005 (5.08 0.76) (17.65 0.25) (1.27 0.13) 0.015 0.002 0.540 0.040 0.110 (2.79) Ref. (0.38 0.05) 0.030 0.002 (13.72 1.02) (0.76 0.05) 0.090 (2.286) Ref. I E E I 1 1 2 2 0.078 0.005 0.090 0.010 (1.98 0.13) (2.29 0.25) 0.100 0.005 Heat Sink Flush with Heat Sink (2.54 0.13) After Forming Within 0.002 ( 0.05) FIGURE 7 - LAND PATTERN DIMENSIONS in inches (millimeters) 0.050 0.010 (1.27 0.25) 0.120 0.010 (3.05 0.25) 0.10 0.005 (2.54 0.12) www.foilresistors.com For any questions, contact: foil vishaypg.com Document Number: 63127 2 Revision: 16-Aug-12