The 81 7042 from Smiths Interconnect is a Resistor with Resistance 5 to 300 Ohms, Power Rating 20 W, Tolerance ±5%. Tags: Surface Mount, Chip, 5 to 300 Ohms, 5 to 200 Ohms, 60 W, Tab & Cover Thin Film RF Resistor. More details for 81 7042 can be seen below.