Featuring a lower profile and higher efficiency, the ZPSA series is TDK-Lambda's second generation of single output 20, 40 and 60 power supplies. Output voltages are available for the most popular voltages of 3.3 to 48V. The ZPSA20 has a 2" x 3.5" footprint, the ZPSA40/60 a 2" x 4" and.