Mitochondrial iron transporter that specifically mediates iron uptake in developing erythroid cells, thereby playing an essential role in heme biosynthesis. The iron delivered into the mitochondria, presumably as Fe(2+), is then probably delivered to ferrochelatase to catalyze Fe(2+) incorporation into protoprophyrin IX to make heme. Interacts with ACB10; this interaction stabilizes SLC25A37 and enhances the function of SLC25A37 to import mitochondrial iron during erythroid differentiation. Highly expressed in hematopoietic organs, fetal liver, bone marrow and spleen. In the developing embryo, it is first detected at 7.5 dpc in the extraembryonic yolk sac, coincident with the appearance of blood islands. Later, restricted expression is seen in 14.5 dpc fetal liver, the primary source of erythrocyte production in mid-gestation. Expression decreases in the spleen around 4-5 weeks of age, suggesting that it is decreased during splenic lymphocyte maturation. Belongs to the mitochondrial carrier (TC 2.A.29) family.