PDSE1-S Unregulated DC-DC Converters CUI Inc PDSE1-S Unregulated DC-DC Converters are 1W isolated modules designed to offer improved efficiency, higher isolation, and excellent thermal performance. These DC-DC converters deliver single unregulated outputs and feature a 1:1 input range, 3.3VDC to 24VDC input voltage range, continuous short-circuit protection, and up to 85% efficiency. The PDSE1-S converters are housed in a 4-pin SIP package and operate at -40°C to +105°C extended operating temperature range. These converters are ideal for precise conversion and isolation of DC rails within a range of industrial, telecom, security, and machine control applications.