These are simply tiny pcb’s with SOT-23 JFETs already soldered on. You just add your own leads and that’s it. Now you are ready to use it as a through hole part!
Available in J102 (mmbfj201) and 2N5457 (mmbf5457). Are you looking to build a phaser? The 2N5457 variety are available in matched pairs or matched quads!