Precision Metal Film Fixed Resistors Type R Series Characteristics - Type R Series Electrical YR8 ER8 CR8 YR1 ER1 CR1 YR2 ER2 CR2 Rated Power @ 70 °C (W) 0.125 0.25 0.5 Resistance Range (ohms) Min 51R1 10R 10R Max 511K 1M0 1M0 Tolerance (%) 0.1 0.25 0.5 Code Letter B C D Temperature Coefficient (ppm/°C) ± 15 ± 25 ± 50 ± 15 ± 25 ± 50 ± 15 ± 25 ± 50 Selection Series E96 Limiting Element Voltage - Nominal (V) 200 250 350 The resistive element comprises a thin Maximum Overload Voltage (V) 400 500 700 film of nickel-chrome alloy evaporated Operating Temperature Range (°C) -65 to +155 onto a high thermal conductivity Dielectric Strength (V) 500 ceramic element. Metal end caps are Insulation Resistance Min Dry (Mohms) 10,000 force fitted to the element prior to Voltage Coefficient Max (ppm/V) 5 spiralling to value. Tinned copper lead wires are welded to the end caps and Dimensions the components are then coated. One 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. Style L* D d nom R8 3.3 ± 0.1 1.7 ± 0.2 0.45 � Metal film resistors have R1 6.3 ± 0.3 2.3 ± 0.2 0.6 excellent stability under load and severe environmental R2 9.5 ± 0.5 3.5 ± 0.5 0.6 conditions. They exhibit very * Length is measured in accordance with IEC 294 low noise current and voltage coefficients. Precision metal film resistors are particularly Derating Curve suitable in all applications 100 where long-term stability is important. 80 60 40 20 0 40 60 70 80 100 120 140 160 Ambient Temperature (°C) Surface Temperature Vs Load 40 30 20 10 0 0 20 40 60 80 100 Percent Rated Power Literature No. 1773265 Dimensions are shown for Dimensions are in millimetres Specifications subject to www.tycoelectronics.com Issued: 04-05 reference purposes only. unless otherwise specified. change. passives.tycoelectronics.com Percent Rated Power Temperature Rise (°C) 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 Dimensions are shown for Dimensions are in millimetres Specifications subject to www.tycoelectronics.com Issued: 04-05 reference purposes only. unless otherwise specified. change. passives.tycoelectronics.com