SQMW52R2J 2.2Ω 5W Wire Wound Resistor ±5%. TE Connectivity SQ series high power resistors featuring fine non-alkali ceramic cores embodied in ceramic cases and sealed with inorganic silica filler. This provides the SQ series with high insulation resistance, low surface temperature, excellent TCR and an entirely fireproof construction. The SQ series resistors are ideally suited to any application where efficient thermal performance is required.