LP Flathead™ Low-Profile Transformers Signal Transformer / Bel LP Flathead™ Low-Profile Transformers utilizes hum-bucking (semi-toroidal) construction to minimize radiated magnetic fields. These transformers offer a power rating of 2VA to 48VA and are available in more than 25 standard configurations. height of 0.69' to 1.39' (17.5mm to 35.3mm) height Signal Transformer / Bel LP Flathead Low-Profile Transformers LP transformers are ideal for critical low-height PC board applications.