Broad-scope metal ion transporter with a preference for zinc uptake. Also mediates cellular uptake of nontransferrin-bound iron. Electroneutral transporter of the plasma membrane mediating the cellular uptake of the divalent metal cations zinc, manganese and iron that are important for tissue homeostasis, metabolism, development and immunity (PubMed:27231142). Functions as an energy-dependent symporter, transporting through the membranes an electroneutral complex composed of a divalent metal cation and two bicarbonate anions (By similarity). Beside these endogenous cellular substrates, can also import cadmium a non-essential metal which is cytotoxic and carcinogenic (By similarity). 2 hydrogencarbonate(out) + Zn(2+)(out) = 2 hydrogencarbonate(in) + Zn(2+)(in) 2 hydrogencarbonate(out) + Mn(2+)(out) = 2 hydrogencarbonate(in) + Mn(2+)(in) Fe(2+)(out) + 2 hydrogencarbonate(out) = Fe(2+)(in) + 2 hydrogencarbonate(in) Cd(2+)(out) + 2 hydrogencarbonate(out) = Cd(2+)(in) + 2 hydrogencarbonate(in) Homotrimer. Expressed at all stages of embryonic and early larval development. Embryos with CRISPR-induced slc39a14 null mutations display altered manganese homeostasis. This is associated with manganese deposition in the brain and altered locomotor activity. Mutants survived into adulthood without any obvious morphological or developmental defects. Belongs to the ZIP transporter (TC 2.A.5) family.