precision metal film fixed resistors type r series 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 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. 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 spiralling to value. tinned copper lead wires are welded to the end caps and 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. characteristics - electrical yr8 er8 cr8 yr1 er1 cr1 yr2 er2 cr2 rated power @ 70 ? (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/?) 15 25 50 15 25 50 15 25 50 selection series e96 limiting element voltage - nominal (v) 200 250 350 maximum overload voltage (v) 400 500 700 operating temperature range (?) -65 to +155 dielectric strength (v) 500 insulation resistance min dry (mohms) 10,000 voltage coefficient max (ppm/v) 5 derating curve dimensions 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 40 60 70 80 100 120 140 160 ambient temperature (?) 100 80 60 40 20 0 percent rated power surface temperature vs load 0 20 40 60 80 100 percent rated power 40 30 20 10 0 temperature rise (?)
precision metal film fixed resistors type r series 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 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 ?mmo?boxes of 1000 pieces. all tape specifications are in accordance with iec286-1. how to order orders for these components should include the following information:- type, tolerance code letter and value e.g. yr1 b 24k3 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 ? 4.25.3 endurance at 125 ? 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
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