CUI Inc – VX78-500, VXO78-500, VX78-1000, and VXO78-1000 series: Next Generation DC Switching Regulators Maximize Economy and Performance



The next generation of non-isolated DC switching regulators, VX78-500, VXO78-500, VX78-1000, and VXO78-1000 series are extremely efficient, typically up to 96%, and balance maximizing economy while delivering a high level of performance as a direct alternative to using linear regulators.

Utilizing switching technology, the models are footprint compatible with TO-220 package LM78XX and LM79XX model regulators and unlike linear regulators, do not require a heat sink. This makes them ideal for use in portable devices, battery-fed equipment, and embedded designs where board space is at a premium and energy efficiency is a concern.

The encapsulated VX78 series and open frame VXO78 series, suited for positive or negative output applications, both offer 500mA and 1A output current options and have no-load input currents as low as 0.2mA. Packaged in an ultracompact, 3-pin SIP footprint, the encapsulated models measure just 0.45 x 0.29 x 0.40in (11.60 x 7.55 x 10.16mm), while the open frame models have even smaller dimensions of 0.39 x 0.28 x 0.43in (10.00 x 7.20 x 11.00mm).

The 500mA series accept a wide range of input voltages up to 4.75 to 36VDC, while the 1A series accommodate input voltage ranges up to 6 to 36VDC. Nominal output voltages of 3.3, 5, 9, 12, or 15VDC, are also available depending upon the series. Operating temperatures for all models range from -40°C up to +71°C at full load, derating to 60% load at +85°C.

These non-isolated DC/DC converters also feature low ripple and noise, continuous short circuit protection, and UL 60950-1 and CSA safety certifications, along with the CE mark. All models carry a minimum MTBF of 2,000,000 hours at +25°C ambient, calculated per MIL-HDBK-217F.


  • 0.5A for VX78-500/VXO78-500
  • 1.0A for VX78-1000/VXO78-1000 current output
  • -40 to +85°C temperature range
  • Pin compatible with LM78XX and LM79XX linear regulators
  • Wide input voltage range
  • Suited for negative and positive output applications
  • No load input current as low as 0.2mA
  • Short circuit protection
  • Low ripple and noise
  • Efficiency up to 96%
  • UL and CSA safety approvals