Mitochondrial transporter mediating uptake of thiamine diphosphate into mitochondria. It is not clear if the antiporter activity is affected by the membrane potential or by the proton electrochemical gradient. {ECO:0000269|PubMed:17035501, ECO:0000269|PubMed:18280798, ECO:0000269|PubMed:27188525, ECO:0000269|PubMed:34587972}. This is the function of SLC25A19 (solute carrier family 25 member 19, Ensembl gene identifier ENSG00000125454).