MCR18 Resistors Thick film rectangular MCR18 (3216 size: 1 / 4W) Features 1) Power rating of 1 / 4W 2) Highly reliable chip resistor Ruthenium oxide dielectric offers superior resistance to the elements. 3) Electrodes not corroded by soldering Thick film makes the electrodes very strong. 4) Leading the world in development and mass production. Since start of production in 1976 (first in the wold), this component has established a solid reputation as a general purpose chip resistor. 5) ROHM resistors have approved ISO9001 certification. Design and specifications are subject to change without notice. Carefully check the specification sheet before using or ordering it. Ratings Item Conditions Specifications 0.25W (1 / 4W) Rated power Power must be derated according to the power derating curve in at 70C Figure 1 when ambient temperature exceeds 70C. 100 80 60 40 20 0 55 0 70 100 155 AMBIENT TEMPERATURE (C) Fig.1 Rated voltage The voltage rating is calculated by the following equation. If the value obtained exceeds the limiting element voltage, the voltage rating is equal to the maximum operating voltage. E: Rated voltage (V) E= PR P: Rated power (W) Limiting element voltage 200V R: Nominal resistance ( ) Nominal resistance See Table 1. 55C to +155C Operating temperature POWER LOAD (%)MCR18 Resistors Jumper type Table 1 Resistance Max. 50m Resistance range Resistance temperature coefficient Resistance tolerance ( ) (ppm / C) Rated current 2A F (1%) 0.1 R < 0.15 (E24) 400200 Operating temperature 55C to +155C 0.15 R < 10 (E24) 250 10 R 2.2M (E24,96) 100 J (5%) 0.1 R < 0.15 (E24) 400200 0.15 R < 1 (E24) 250 1.0 R < 2.2 (E24) 500350 2.2 R < 10 (E24) 500 10 R 10M (E24) 200 Before using components in circuits where they will be exposed to transients such as pulse loads (shortduration, highlevel loads), be certain to evaluate the component in the mounted state. In addition, the reliability and performance of this component cannot be guaranteed if it is used with a steady state voltage that is greater than its rated voltage. Characteristics Guaranteed value Item Test conditions (JIS C 5201-1) Resistor type Jumper type J : 5% Max. 50m JIS C 5201-1 4.5 Resistance F : 1% Variation of resistance JIS C 5201-1 4.8 See Table.1 with temperature Measurement : 55 / +25 / +125C JIS C 5201-1 4.13 Rated voltage (current) 2.5, 2s. Overload (2.0%+0.1 ) Max. 50m Limiting Element Voltage2 : 400V A new uniform coating of minimum of JIS C 5201-1 4.17 95% of the surface being immersed RosinEthanol (25%WT) Solderability and no soldering damage. Soldering condition : 2355C Duration of immersion : 2.00.5s. (1.0%+0.05 ) Max. 50m JIS C 5201-1 4.18 Resistance to No remarkable abnormality on the appearance. Soldering condition : 2605C soldering heat Duration of immersion : 101s. (1.0%+0.05 ) Max. 50m JIS C 5201-1 4.19 Rapid change of Test temp. : 55C~+125C 5cyc temperature (3.0%+0.1 ) Max. 100m JIS C 5201-1 4.24 40C, 93%RH Damp heat, steady state Test time : 1,000h~1,048h (3.0%+0.1 ) Max. 100m JIS C 5201-1 4.25.1 Rated voltage (current), 70C Endurance at 70C 1.5h : ON 0.5h : OFF Test time : 1,000h~1,048h (3.0%+0.1 ) Max. 100m JIS C 5201-1 4.25.3 155C Endurance Test time : 1,000h~1,048h (1.0%+0.05 ) Max. 50m JIS C 5201-1 4.29 Resistance to solvent 235C, Immersion cleaning, 50.5min. Solvent : 2-propanol (1.0%+0.05 ) Max. 50m JIS C 5201-1 4.33 Bend strength of Without mechanical damage such as breaks. the end face plating