Signal has designed the transformers with a rigid pin construction that allows for easier board insertion and produces higher reliability. The LPI transformers also have an industry-standard pin configuration, for pin-to-pin compatibility. Other improvements to the transformers include mounting holes for greater resistance to shock and vibration, and the transformers are hermetically sealed so the LPI family can be wave soldered.
The 12 VA and 18 VA LPI transformers feature improved electrical characteristics, including better regulation, temperature rise, and efficiency. Dielectric strength of the transformers is 4000 VRMS Hipot. Featuring a split-bobbin design, the LPI transformers have dual primaries and can be designed with either series or parallel secondaries. The transformer' height ranges from 1.050 to 1.22, and weight is less than one pound.