The LM2596T-12 is a fixed 12 V output step-down (buck) switching regulator from the SIMPLE SWITCHER® family, delivering up to 3 A continuous with a 150 kHz switching frequency. The 150 kHz switching rate keeps switching losses modest but demands a larger inductor than a higher-frequency part. The 3 A output ceiling suits point-of-load rails for 12 V bus-powered equipment, industrial control panels, and automotive accessory supplies where the input bus is 4.5 V to 40 V.
Through-hole TO-220-5 — board integration and thermal path
The TO-220-5 formed-leads package is a through-hole footprint with a metal tab for heatsinking — the tab is at ground potential, so a thermal pad or clip can be used without isolation. The tab-to-ambient thermal resistance depends on the heatsink; a free-air TO-220 at 3 A output may need forced airflow or a clip-on sink.
Obsolete — sourcing options and replacement path
Sourcing this part for BOM fill or repair
Buyers should verify date code and package condition on any surplus stock. The TO-220-5 lead form is robust, but parts from long-term storage may need a bake if the moisture-barrier bag is compromised.