High-Voltage Buck for Industrial Rails
The LM2574HVN-15/NOPB is a fixed 15 V output step-down (buck) regulator from Texas Instruments' SIMPLE SWITCHER series, delivering up to 500 mA from a 4 V to 60 V input rail. The wide input range means it can regulate from a 48 V telecom bus or a 24 V industrial supply without a separate pre-regulator — the 60 V abs-max ceiling handles transients on a nominal 48 V line. Switching at 52 kHz, the part uses an external diode and inductor — the lower frequency keeps switching losses small in the 8-PDIP package, but the inductor is physically larger than what a 500 kHz part needs. The 500 mA output is continuous; derate for ambient temperature above 25 °C per the datasheet's thermal model.
Through-Hole Package and Temperature Grade
Mounted in an 8-DIP (0.300", 7.62 mm) through-hole package — the 8-PDIP supplier device package mates with standard prototyping boards and is hand-solderable without reflow. The junction temperature range is -40 °C to 125 °C, covering industrial and outdoor enclosures where the ambient can hit 85 °C with self-heating margin. No synchronous rectifier is integrated — the freewheeling diode is external, which adds a component but lets the designer select a Schottky with the forward drop and reverse leakage that match the load profile. The single positive output is fixed at 15 V; no feedback divider is needed on the board.
Active Lifecycle and Sourcing Reality
The part is RoHS3 compliant. For a BOM line that needs a through-hole 15 V buck at 500 mA, this is a current-production choice, not a scavenge part. Sourced through independent distribution against an RFQ.