L7805ABV

L7805ABV is the TO-220 ordering code for the STMicroelectronics L7805 5 V linear regulator, listed as Active on the maker’s eStore page for this exact code. Read the AB grade on its own rows: an output of 4.9 V minimum, 5.0 V typical and 5.1 V maximum — the ±2 % A-grade tolerance, where the C grade allows ±4 % — output current up to 1.5 A, an input absolute maximum of 35 V — a stress rating from the maker’s absolute-maximum-ratings table, not a guaranteed operating point — and a dropout voltage of 2 V typical at 1 A and TJ = 25 °C. The 4.9 V to 5.1 V output window is specified at VI = 10 V, IO = 1 A and TJ = 25 °C; over IO of 5 mA to 1 A and VI of 7.5 V to 18 V the window is 4.8 V to 5.2 V. The selection point is the honest 5 V workhorse rail: a 12 V or 24 V input down to a regulated 5 V for logic and mixed-signal loads, in the through-hole package that bolts to a chassis or a clip heatsink. Selection advice: at ampere-class loads the design is thermal — dissipation is approximately (VIN − VOUT) × IOUT, plus the ground-current contribution, so do not substitute the typical dropout specification for the actual input-to-output voltage difference; check junction temperature, safe operating area and heatsinking at the intended rail and load before approving this code for a sealed enclosure. Parameters verified against the ST L78 datasheet DS0422 Rev 38 (absolute maximum ratings Table 1 and the L7805A electrical Table 3) and the ST eStore listing for this code.