Hammond 164E12 2.4VA 12.6V Center-Tapped PCB Transformer, 115V Primary

Designed for printed circuit boards, the 164E12 is a low-profile 2.4VA power transformer with an economical single 115V primary that operates on 50 or 60 Hz. Engineers specifying low-voltage AC for board-level circuits get a 12.6V centre-tapped secondary from a split bobbin design. The secondaries produce 12.6V centre-tapped at 0.2A in series, or 6.3V at 0.4A when the two windings are paralleled.

The secondary is made up of two windings that are wound non-concentrically on the split bobbin. That arrangement keeps primary-to-secondary coupling low, so no electrostatic shield is required. Insulation is Class B (130 degrees C) and the unit is hipot rated at 2,500V RMS. Note that the design requires all windings to be used, so connect both secondaries in series or in parallel.

The E-size body measures 1.38 in long by 1.13 in wide by 1.19 in high and weighs 0.25 lb per the series specification sheet. At 2.4VA it needs no mounting hardware: the unit is held by its P.C. board pins, which use industry-standard pin spacing.

The transformer is c UL us recognized and listed as RoHS and REACH compliant. Where a design must run from 115V or 230V, the dual-primary equivalent in the same series is 162E12.