VAR (Vishay Audio Resistor) Vishay Foil Resistors Ultra High Precision, High Resolution Z-Foil Audio Resistor, with TCR of ± 0.2 ppm/°C, Tolerance to ± 0.01 % and Noise < - 40 dB FEATURES • Temperature coefficient of resistance (TCR): - 55 °C to + 125 °C, 25 °C ref. ± 0.2 ppm/°C typical (see table 1) • Rated power: to 0.4 W at + 70 °C Pb-free Available RoHS* COMPLIANT • Tolerance: to ± 0.01 % Any value at any tolerance available within resistance range INTRODUCTION The VAR, composed of Vishay’s Bulk Metal® Z-foil technology, with improved sound quality, provides a combination of low noise and low inductance/capacitance, making it unrivalled for applications requiring low noise and distortion-free properties. While the regular foil resistors are already widely acknowledged as the leading resistors for audio applications, the special “naked Z-foil resistor” design without mold or encapsulation, adds an additional dimension for reducing signal distortion and increasing clarity in signal processing. Our application engineering department is available to advise and to make recommendations. For non-standard technical requirements and special applications, please contact us. • Load life stability: to ± 0.01 % at 70 °C, 2000 h at rated power • Resistance range: 10 Ω to 100 kΩ (higher or lower values of resistance are available) • Electrostatic discharge (ESD) above 25 000 V • Non inductive, non capacitive design • Rise time: 1 ns without ringing • Current noise: < - 40 dB • Thermal EMF: 0.05 µV/°C typical • Voltage coefficient: < 0.1 ppm/V • Low inductance: < 0.08 µH typical • Non hot spot design • Terminal finishes available: lead (Pb)-free tin/lead alloy FIGURE 1 - TYPICAL TCR CURVE Z-FOIL + 500 APPLICATIONS + 400 • High precision amplifiers + 300 + 200 • High-end speaker system + 100 ΔR 0 R (ppm) - 100 • High-end audio circuit 0.05 ppm/°C - 200 - 0.1 ppm/°C • Transducer 0.1 ppm/°C - 300 0.14 ppm/°C - 400 • High fidelity audio amplifier 0.2 ppm/°C - 0.16 ppm/°C - 500 - 55 - 25 0 + 25 + 60 + 75 + 100 + 125 Ambient Temperature (°C) TABLE 1 - RESISTANCE VERSUS TCR (- 55 °C to + 125 °C, + 25 °C Ref.) RESISTOR RESISTANCE VALUE (Ω) TYPICAL TCR AND MAXIMUM SPREAD (ppm/°C) TIGHTEST TOLERANCE (%) 100 to < 100K ± 0.2 ± 1.8 0.01 50 to < 100 ± 0.2 ± 2.8 0.01 10 to < 50 ± 0.2 ± 3.8 0.02 VAR Note: • For other values and tighter tolerances, please contact application engineering using the footer below * Pb containing terminations are not RoHS compliant, exemptions may apply Document Number: 63140 Revision: 12-Feb-08 For any questions, contact: [email protected] www.vishay.com 1 VAR (Vishay Audio Resistor) Vishay Foil Resistors Ultra High Precision, High Resolution Z-Foil Audio Resistor, with TCR of ± 0.2 ppm/°C, Tolerance to ± 0.01 % and Noise < - 40 dB FIGURE 2 - STANDARD DIMENSIONS L W H This product is fragile and may be damaged if mishandled. Vishay assumes no responsibility for damage caused by improper handling. LL Soldered PCB Lead Material #22 AWG Round Solder Coated Copper LS TABLE 2 - SPECIFICATIONS AMBIENT POWER RATING MAXIMUM WORKING VOLTAGE RESISTANCE RANGE (Ω) 10 to 100K at + 70 °C 200 0.4 W FIGURE 3 - POWER DERATING CURVE Percent of Rated Power at + 125 °C 200 % - 55 °C DIMENSIONS at + 125 °C INCHES 0.2 W W: 0.080 max. L: 0.250 max. H: 0.310 max. LL: 1.000 ± 0.125 LS: 0.150 ± 0.005 mm W: 2.03 max. L: 6.35 max. H: 7.87 max. LL: 25.4 ± 3.18 LS: 3.81 ± 0.13 FIGURE 4 - TRIMMING TO VALUES (Conceptual Illustration) + 70 °C Double Rated Power 175 % 150 % Interloop Capacitance Reduction in Series 125 % Rated Power 100 % Mutual Inductance Reduction due to Opposing Current in Adjacent Lines 75 % 50 % 25 % 0 - 75 - 50 - 25 0 + 25 + 50 Current Path After Trimming Trimming Process Removes this Material from Shorting Strip Area Changing Current Path and Increasing Resistance + 75 + 100 + 125 + 150 + 175 + 200 Note: Foil shown in black, etched spaces in white Ambient Temperature (°C) www.vishay.com 2 Current Path Before Trimming For any questions, contact: [email protected] Document Number: 63140 Revision: 12-Feb-08 VAR (Vishay Audio Resistor) Ultra High Precision, High Resolution Z-Foil Audio Resistor, Vishay Foil Resistors with TCR of ± 0.2 ppm/°C, Tolerance to ± 0.01 % and Noise < - 40 dB TABLE 3 - GLOBAL PART NUMBER INFORMATION NEW GLOBAL PART NUMBER: Y070680K5000T9L (preferred part number format) DENOTES PRECISION RESISTOR VALUE R=Ω K = kΩ Y Y 0 AER* 7 0 6 8 0 K 0 = standard part, tin/lead termination 9 = standard part, lead (Pb)-free termination 1 - 999 = custom 5 0 0 0 T 9 PRODUCT CODE RESISTANCE TOLERANCE PACKAGING 0706 = VAR T = ± 0.01 % Q = ± 0.02 % A = ± 0.05 % B = ± 0.1 % C = ± 0.25 % D = ± 0.5 % F = ± 1.0 % L = bulk pack L FOR EXAMPLE: ABOVE GLOBAL ORDER Y0706 80K5000 T 9 L: TYPE: VAR VALUE: 80.5 kΩ ABSOLUTE TOLERANCE: ± 0.01 % TERMINATION: lead (Pb)-free PACKAGING: bulk pack Note * Application engineering release: for non-standard requests, please contact application engineering. Document Number: 63140 Revision: 12-Feb-08 For any questions, contact: [email protected] www.vishay.com 3 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1