Fixed 8V rail — the BOM callout is exact
The LM2940T-8.0/NOPB is a positive fixed-output LDO regulator from the LM2940 family, delivering a regulated 8V at up to 1A. The fixed 8V output means this is not an adjustable part — the BOM line must specify exactly 8V, and the input rail must stay above 9V to maintain regulation at full load given the 1V max dropout at 1A.
Dropout headroom and input rail budgeting
Maximum dropout is 1V at 1A output, so a 9V input rail is the practical minimum for full-load regulation. The 26V maximum input voltage gives headroom for unregulated supplies or battery voltages that sag under load. Quiescent current is 10 mA typical, rising to 15 mA max — this matters for always-on circuits where the LDO's own consumption cuts into standby budget.
Protection set for industrial and automotive environments
Built-in protection covers over-current, over-temperature, reverse polarity, and short circuit conditions. This reduces the external protection components needed on the board and improves system reliability in environments where supply faults are expected.
PSRR at 120Hz — line ripple rejection for analog loads
PSRR is 66dB at 120Hz. For a 1Vpp input ripple at 120Hz, the output ripple is attenuated by the PSRR value.
Through-hole TO-220-3 — thermal and assembly notes
The tab is electrically connected to the output pin, so the heatsink must be isolated or the mounting hole must use an insulating shoulder washer if the heatsink is grounded. The three-pin layout (input, ground, output) is industry-standard and matches the footprint of other TO-220 LDOs, making it a drop-in replacement for 8V fixed regulators in the same package.
The product status is Active.