-50V input, 1.5A output: the high-voltage negative rail workhorse
The Texas Instruments LM337HVK STEEL/NOPB is a negative adjustable linear regulator in the LM337 family, distinguished by its high-voltage rating: input up to -50V and output adjustable from -1.2V to -47V. The 1.5A output current and 77dB PSRR at 120Hz make it suited for powering analog rails in industrial, telecom, and test equipment where a clean negative supply is needed. The TO-204AA (TO-3) steel package provides a hermetic seal and a large thermal mass for heat sinking through the chassis.
No successor part is recorded in the lifecycle entry. For new designs, a current-production negative adjustable regulator with similar voltage and current ratings should be selected.
77dB PSRR and the steel TO-3 package
The 77dB PSRR at 120Hz means the regulator attenuates full-wave-rectified ripple by a factor of about 7000 — relevant for linear supplies fed from a 50/60 Hz mains transformer. The 'STEEL' suffix indicates the can material — steel versus the more common nickel-plated copper — which affects thermal conductivity and corrosion resistance in humid environments.
Protection features and output configuration
The single-channel negative output is adjustable via two external resistors. Built-in protection includes over-current limiting, over-temperature shutdown, and short-circuit current limiting — these are standard for the LM337 family and prevent damage under output fault conditions.