300144, 300145 Vishay Foil Resistors Bulk Metal Foil Technology High Precision Voltage Divider Resistors with TCR Tracking to 0.5 ppm/C and Tolerance Match to 0.005 % (50 ppm) FEATURES Temperature coefficient of resistance (TCR) absolute: 2 ppm/C typical (- 55 C to + 125 C, + 25 C ref.) TCR tracking: 0.5 ppm/C Tolerance: absolute and matching to 0.005 % (50 ppm) INTRODUCTION Power rating: 0.2 W at 70 C, for the entire resistive Why tight tolerance is important element R and R , divided proportionally between the two 1 2 Why do users employ tight tolerance resistors A system or values a device or one particular circuit element must perform for a specified period of time and at the end of that service period Load life ratio stability: < 0.005 % (50 ppm) 0.2 W at 70 C it must still be performing within specifications. for 2000 h During its useful life it may have been subjected to some Maximum working voltage: 200 V hostile service conditions and it is no longer within purchased tolerance. Resistance range: 100R to 20K per resistive element What is ratio Vishay Foil resistors are not restricted to standard The ratio tolerances available in a divider are variable and values/ratios specific as requested values/ratios can be dependent on resistor technology. Bulk Metal foil provides supplied at no extra cost or delivery (e.g. 1K2345 vs. 1K) the tightest ratio tolerance available. Electrostatic discharge (ESD) up to 25 000 V The tight resolution capability and overall stability of foil resistors permit adjustment within the divider to ratio not Non-inductive, non-capacitive design available with other technologies. Ratios in network form, in Rise time: 1 ns effectively no ringing a common package have a better chance of holding tight tolerances than those formed in a discrete matched set by Thermal stabilization time < 1 s (nominal value achieved sorting. within 10 ppm of steady state value) Molded foil 300144, 300145 resistors can be provided in a Current noise: 0.010 V /V of applied voltage (< - 40 dB) RMS tolerance as tight as 0.005 %. Theoretically, ratios such as these can be made initially with other resistor technologies. Thermal EMF: 0.05 V/C typical However, less stable products will not hold these tight ratios Voltage coefficient: < 0.1 ppm/V tolerances over time and applied stresses like voltage and temperature. Non inductive: < 0.08 H Vishay Foil Resistors (VFR) Bulk Metal foil dividers/networks Non hot spot design 300144, 300145 hold their ratio tolerances under defined Terminal finish: lead (Pb)-free or tin/lead alloy circumstances. Networks with tight ratio tolerances and controlled tracking extend the useful life of equipment, Compliant to RoHS directive 2002/95/EC whether expressed as mean-time-between-failures (MTBF) Prototype quantities available in just 5 working days or service periods to recalibration or end-of-life-cycle. or sooner. For more information, please contact How to avoid thermal EMF foil vishaypg.com When the resistors terminals and the resistive element are made of dissimilar metals and two junctions are at a different For better performances see 300144Z, 300145Z (Z-Foil) temperature, a voltage is produced which is called thermal datasheet EMF. The level of voltage output is a function of the metals involved and the differential temperature. The voltage APPLICATIONS produced is either positive or negative depending on which R 2 junction is considered as a reference point. Virtually all Instrumentation amplifiers resistive products have these metallic junctions. It is R 1 Bridge networks V 1 presumed they will eventually be terminated to copper as a - V out final metallic combination and therefore copper is used as a Differential amplifiers + V R 2 3 typical reference material. 300144 Military R 4 300144, 300145 have the lowest thermal EMFs because all 300145 junctions have low microvolts outputs. Moreover, Space construction of the resistive element is such that the input Medical and output junctions of the resistor are so close that the Automatic test equipment temperature gradients between then is highly unlikely. These design factors produce a divider with very low thermal EMF. Down-hole (high temperature) Our application engineering department is available to advise and make recommendations. For non-standard technical requirements and special applications. Please contact us. * Pb containing terminations are not RoHS compliant, exemptions may apply Document Number: 63045 For any questions, contact: foil vishaypg.com www.vishayfoilresistors.com Revision: 16-Sep-13 1300144, 300145 Vishay Foil Resistors TABLE 1A - MODELS 300144 AND 300145 TABLE 1B - MODELS 300144 AND 300145 SPECIFICATIONS SPECIFICATIONS ABSOLUTE TCR RESISTANCE TOLERANCE TCR TRACKING MAX. (- 55 C to + 125 C, RATIO MATCH RESISTANCE ABSOLUTE + 25 C ref.) 1:1 0.5 ppm/C VALUES TOLERANCE 0.005 % TYPICAL AND MAX. > 1:1 to 4:1 1.0 ppm/C SPREAD > 4:1 to 10:1 1.5 ppm/C 500 to 20 k 0.005 % 0.01 % 2 ppm/C 3 ppm/C > 10:1 2.0 ppm/C 100 to < 500 0.01 % Note See table 3 for additional established ratios FIGURE 1 - TRIMMING TO VALUES (conceptual illustration) Interloop Current Path Capacitance Before Trimming Reduction in Series Current Path Mutual After Trimming Inductance Reduction due Trimming Process to Opposing Removes this Material Current in from Shorting Strip Area Adjacent Lines Changing Current Path and Increasing Resistance Note: Foil shown in black, etched spaces in white FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in inches (millimeters) (2) (2)(3) Model 300144 and Schematic Model 300145 and Schematic 0.375 0.2 (9.53) (5.08) 0.295 0.1 Match (7.49) (2.54) 654 Tolerance VFR Date Code 0.320 6 54 9825 R R 1 2 (8.13) Model No. 300144 1 0.015 0.005 R1 (0.38 0.13) R R Indicator 4 3 0.025 0.005 (1) 0.75 VFR (0.64 0.13) 1 23 0.375 (19.05) Date Code 0730 (9.53) Model No. 300145 0.015 0.005 R R 1 2 (0.38 0.13) Match Tolerance 0.025 0.005 (1) 0.75 (0.64 0.13) Dimensional Tolerance: 0.010 (0.25) (19.05) 0.1 (2.54) 1 23 (1) Lead wires: 22 AWG solder coated copper, 0.75 minimum length (2) Each divider pair consists of two resistors on one single chip 123 (3) For model 300145 the 2 chips are independent and with no special relationship from chip to chip 0.1 (2.54) www.vishayfoilresistors.com For any questions, contact: foil vishaypg.com Document Number: 63045 2 Revision: 16-Sep-13 10K000 0.01% 10K000 10K000 0.01% 10K000