Hammond 183J20-BULK 30VA 20V C.T. PCB Transformer, Bulk Pack

The 183J20-BULK is the bulk-pack part number for the 183J20, a 30VA low voltage power transformer from the 183 Series built for printed circuit board mounting. It suits OEM engineers and electronics builders who need a compact, board-mounted source of low AC voltage from either 115 or 230 VAC mains at 50/60 Hz.

Output is taken from dual secondary windings that are non-concentrically wound and can be wired in series, in parallel or used separately. Wired in series, the 183J20-BULK delivers 20V C.T. @ 1.5A; with the windings in parallel it delivers 10V @ 3A (RMS). When the secondaries are connected in series (pin 9 connected to pin 10), that connection acts as the center tap.

Construction uses a low profile, split bobbin with top shroud design. Primary to secondary coupling is low, so no electrostatic shield is required, insulation is hipot tested to 4,000V RMS and rated Class F (155 degrees C). Per the series specification sheet, the 30VA size measures 2.63 x 2.19 x 1.56 in (L x W x H), uses 0.045 in square pins and weighs 1.15 lbs; the listed shipping weight for this bulk part number is 0.9 lbs (0.41 kg).

Mounting is four-hole using #6 screws (mounting screws not provided), and the pins follow industry standard spacing for P.C. board layouts. For 115V operation the primary windings are connected in parallel; for 230V operation they are connected in series. The 183 Series is cUL listed, and this part number is RoHS and REACH compliant.