Precision Metal Film Fixed Resistors Type R Series Characteristics Electrical Type R Series The resistive element comprises a thin film of nickel-chrome alloy evaporated onto a high thermal conductivity ceramic element. Metal end caps are force fitted to the element prior to Rated Power @ 70 °C (W) Resistance Range (ohms) Min Max Tolerance (%) Code Letter Temperature Coefficient (ppm/°C) Selection Series Limiting Element Voltage - Nominal (V) Maximum Overload Voltage (V) Operating Temperature Range (°C) Dielectric Strength (V) Insulation Resistance Min Dry (Mohms) Voltage Coefficient Max (ppm/V) YR8 ER8 0.125 51R1 511K CR8 ± 15 ± 25 ± 50 YR1 ER1 CR1 0.25 10R 1M0 0.1 0.25 0.5 B C D ± 15 ± 25 ± 50 E96 250 500 -65 to +155 500 10,000 5 200 400 YR2 ER2 0.5 10R 1M0 CR2 ± 15 ± 25 ± 50 350 700 spiralling to value. Tinned copper lead wires are welded to the end caps and the components are then coated. One Dimensions coat of phenolic resin is followed by three coats of epoxy resin. All resistors are tested for value and tolerance. Key Features Precision metal film resistors with tolerance to 0.1% and temperature coefficients to 15ppm. ■ Metal film resistors have excellent stability under load and severe environmental conditions. They exhibit very low noise current and voltage coefficients. Precision metal film resistors are particularly suitable in all applications where long-term stability is important. Style L* D d nom R8 3.3 ± 0.1 1.7 ± 0.2 0.45 R1 6.3 ± 0.3 2.3 ± 0.2 0.6 R2 9.5 ± 0.5 3.5 ± 0.5 0.6 * Length is measured in accordance with IEC 294 Derating Curve 100 80 Percent Rated Power ■ 60 40 20 0 40 60 70 80 100 120 140 160 Ambient Temperature (°C) Surface Temperature Vs Load Temperature Rise (°C) 40 30 20 10 0 0 20 40 60 80 100 Percent Rated Power Literature No. 1773265 Issued: 04-05 Dimensions are shown for reference purposes only. Dimensions are in millimetres unless otherwise specified. Specifications subject to change. www.tycoelectronics.com passives.tycoelectronics.com Precision Metal Film Fixed Resistors Type R Series Mounting The resistors are suitable for processing on automatic insertion equipment and cutting and bending machines. Marking The resistors are marked with a five-band colour code in accordance with IEC 62. Packaging R series colour coded resistors are normally supplied taped in ‘ammo’ boxes of 1000 pieces. All tape specifications are in accordance with IEC286-1. Performance Characteristics Evaluation of the performance characteristics is carried out with reference to IEC specifications QC 400 000 and QC 400 100. TEST REF Long Term Tests ±(1% + 0.05 ohm) 4.23 Climatic sequence 4.24 Damp heat, steady state 4.25.1 Endurance at 70 °C 4.25.3 Endurance at 125 °C TEST REF Short Term Tests ±(0.25% + 0.05 ohm) 4.13 Overload 4.16 Robustness of terminations 4.18 Resistance to soldering heat 4.19 Rapid change of temperature 4.22 Vibration How to Order Orders for these components should include the following information:Type, tolerance code letter and value e.g. YR1 B 24K3 Literature No. 1773265 Issued: 04-05 Dimensions are shown for reference purposes only. Dimensions are in millimetres unless otherwise specified. Specifications subject to change. www.tycoelectronics.com passives.tycoelectronics.com