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This is a 5V 5A switch-mode voltage regulator. It is a high-efficiency replacement for popular three-terminal LM78H05K linear regulators and it is pin-to-pin compatible with the common and now obsolete LM78H05K linear regulators. The mechanical design allows the PSU7 to fit anywhere where an LM78H05K was used. The bottom of the PCB is ground, just like the case of the LM78H05K . The maximum continuous output current is 5A and at room temperature the PSU7 does not need a heatsink to maintain this current indefinitely. All the required capacitors are included on the module, no external capacitors are required and additional input capacitors do no harm. The output voltage guaranteed to be within +/-1% as the load varies. The module has a (tiny) trim potentiometer and the voltage is factory adjusted to within 50mV of 5V with a 12V input and a 3A load. The original LM78H05K had a rather loosely specified output voltage and it could vary by as much as 250mV without load and at room temperature. Many designs incorporated some circuitry to raise the output voltage to prevent under voltage resets of microprocessors. The PSU7 LM78H05K replacement design can be adjusted by up to 250mV in either direction with the trim pot to ensure compatibility with almost all circuits that used the LM78H05K . The module has thermal shutdown and current limit protection. The absolute maximum input voltage is 28V. The PSU7 can be mounted on existing heatsinks, even ones that use sockets under the heatsink. The hole diameters and pin diameter is exactly the same as the original package dimensions.