R-78Kxx Switching Regulators Feature Enhanced Performance

Mar 14, 2023
R-78Kxx Switching Regulators Feature Enhanced Performance News Image
Our R-78E series of three-terminal switching regulators has been a very popular high-efficiency replacement for three-terminal, TO-220 style linear regulators, saving energy, board space, and cost, by eliminating heatsinks and their assembly overheads. For 2023, we are announcing an upgrade to the series, denoted R-78Kxx, with improved specifications.

Versions rated at 0.5A, 1A, and 2A are available, with fixed outputs now including 1.2V, 1.5V, 1.8V, 2.5V, and 6.5V, depending on model, as well as the traditional outputs 3.3V, 5V, 9V, 12V, and 15V. Input voltage range has been extended to 36V maximum and peak efficiency across the range has increased to 96%, allowing all parts to operate from -40°C to 90°C ambient – many with no derating.

All R-78K series parts feature under-voltage lockout and short-circuit protection with automatic recovery and can meet EN 55032 class B EMC specifications with a simple input filter. The 0.5A and 1A rated versions are in a SIP-3 miniature package, 11.5 x 7.55mm footprint, 10.2mm high while the 2A version is 11.5 x 8.5mm footprint, 17.5mm high, again in a SIP-3 arrangement.
Applications
  Series
1 DC/DC, Single Output, THT R-78K-0.5 Series
Focus
  • Efficiency up to 96%, no need for heatsinks
  • 4.5 - 36VDC wide input voltage
  • -40°C to +90°C ambient operation without derating
  • Pin compatible with 78 series regulators
2 DC/DC, Single Output, THT R-78K-1.0 Series
Focus
  • Efficiency up to 95%, no need for heatsinks
  • 4.5 - 36VDC wide input voltage
  • -40°C to +90°C ambient operation without derating
  • Pin compatible with 78 series regulators
3 DC/DC, Single Output, THT R-78K-2.0 Series
Focus
  • Efficiency up to 96%, no need for heatsinks
  • 4.5 - 36VDC wide input voltage
  • -40°C to +90°C ambient operation without derating
  • Pin compatible with 78 series regulators