Hammond 229D34 48VA 34V C.T. Low Profile PCB Mount Transformer

The 229D34 is a 48 VA dual-primary power transformer from the 229 Series, designed for low profile mounting directly on a printed circuit board. It suits OEM engineers and electronics designers who need an on-board low voltage supply: wired in series, the secondaries deliver 34V C.T. @ 1.4A (center tapped); wired in parallel, they deliver 17V @ 2.8A. At 48 VA it is the largest power size in the 229 range, which spans 2 VA to 48 VA.

The transformer uses a dual - split bobbin with a semi-toroidal design. That construction gives low primary to secondary coupling and balanced windings, so no electrostatic shield is required, and it keeps EMF radiation low. The universal dual primary is rated 115/230V at 50/60 Hz, so the same part can be wired for either line voltage. Insulation is Class B (130 degrees C) with a hipot rating of 1,750V RMS.

Per the manufacturer drawing, the 229D34 measures A 2.500" ±0.063, B 3.125" ±0.063 and C 1.375" ±0.063, with D 0.600", D1 0.660" and E 2.180" (each ±0.030). The pins are 0.040" square (±0.005). The primary windings (115V each) sit on pins 1-2 and 3-4, and the two 17V 1.4A secondaries on pins 5-6 and 7-8. Series-table regulation for the 48 VA size is 0.15, and the shipping weight is 1.29 lbs (0.59 kg).

The drawing also lists electrical acceptance tests: excitation current of 80mA max at 115V, 60Hz; secondary no-load voltage of 20.76V ±2% on each secondary at 115V, 400Hz; and a primary-to-secondary hipot of 1750V, 60Hz for 1 second. Part number, 48VA, 50/60Hz and CANADA are stamped on top of the unit in black ink.

With 1.4A available from the 34V center-tapped winding, or 2.8A at 17V in parallel, this 48 VA size is aimed at boards that need more current than the smaller 229 sizes provide. The part is C UL US recognized under UL file E207860 and is listed as RoHS and REACH compliant. Identifiers: UPC 623980271675, UNSPSC 39121301.