Voltage range and output capability
The LM723H/NOPB accepts up to 40 V input and delivers an adjustable output from 2 V up to 37 V, sourced at up to 150 mA continuous. That 150 mA ceiling is the thermal limit in the TO-100 can — the package's junction-to-ambient resistance sets the real derated current at elevated ambient, so a 125 °C environment will pull that number down.
PSRR across the audio band
Power supply rejection ratio runs from 86 dB at 50 Hz down to 74 dB at 10 kHz. That 12 dB roll-off across two decades means the regulator attenuates mains ripple well but passes higher-frequency switching noise more readily — a post-filter LC stage may be needed if the load is sensitive above 10 kHz.
Package and temperature grade
The metal can provides a hermetic seal and a lower thermal resistance path to the board than plastic DIPs of the same era; the 10-pin circular layout requires a dedicated footprint, not a standard DIP pattern.
Protection and control features
Built-in short circuit protection and current limit plus frequency control are on-chip. The frequency control pin allows an external capacitor to set the regulator's internal oscillator frequency, which is useful for synchronising multiple regulators or shifting switching noise out of a sensitive band.