The lightweight high-entropy alloy represents an innovative class of multicomponent systems that combine low density with the exceptional mechanical properties of high-entropy alloys. We present a detailed synthesis and investigation of a $3d$ rich equiatomic high entropy alloy superconductor Sc-Ti-V-Nb-Cu, which crystallizes in a body-centered cubic structure. Magnetization, electrical resistivity, and heat capacity measurements confirm weakly coupled bulk type II superconductivity with a transition temperature of 7.21(3) K and an upper critical field of 12.9(1) T close to the Pauli paramagnetic limit. Its remarkably high critical current density of $1.812\left(1\right)\times {10}^5$ A-${\mathrm{cm}}^{-2}$ exceeds practical requirements. The combination of low-density, moderate transition temperature, high upper critical field, and large critical current density positions Sc-Ti-V-Nb-Cu as a promising candidate for next-generation superconducting device applications.

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• Superconductivity
• Synthesis
• Disordered alloys