Active production — 500 mA buck in a through-hole DIP
The LM2574N-ADJ/NOPB: Housed in an 8-pin PDIP (0.300" wide, 7.62 mm pitch), it is a through-hole part suited for prototype builds, rework-friendly designs, or legacy BOM positions that avoid surface-mount assembly.
Switching frequency and thermal envelope
The internal oscillator runs at 52 kHz — a low switching frequency that reduces switching losses at the cost of a larger inductor and output capacitor compared to modern 500 kHz+ parts.