What this 5V fixed regulator actually does
The Texas Instruments LM330T-5.0/NOPB is a positive fixed-output linear voltage regulator delivering a regulated 5V rail from a DC input up to 26V. It is a single-regulator device in a through-hole TO-220-3 package, rated for 150 mA continuous output current. The fixed 5V output means no external resistor divider is needed — just an input capacitor and an output capacitor and it regulates. This part is aimed at board-level power conditioning in equipment that runs from an unregulated DC bus (like a 12V or 24V supply) and needs a clean 5V rail for logic, sensors, or analog front-ends.
150 mA output — sizing the load budget
The 150 mA output current rating sets the maximum load this regulator can supply continuously.
Protection features that save the board
The LM330T-5.0/NOPB includes over-temperature shutdown, reverse polarity protection, and short-circuit current limiting. Over-temperature protection prevents thermal runaway if the heatsink is undersized or airflow is blocked. Reverse polarity protection is a real bonus — if the input supply is accidentally reversed (e.g., battery leads swapped), the regulator does not conduct and the downstream circuitry stays safe. Short-circuit protection limits the output current during a fault, reducing stress on the pass transistor and the PCB traces. These protections are built in; no external clamping diodes or foldback circuits are needed.
Package and mounting — TO-220-3 through-hole
The TO-220-3 package is a standard through-hole power package. The three leads are input, ground, and output (left to right when the tab faces away from you). The metal tab is internally connected to ground (the center lead) and can be soldered to a copper pad on the PCB or bolted to a chassis heatsink. The through-hole mounting is robust for prototyping, point-to-point wiring, and applications where vibration or thermal cycling might stress surface-mount joints.
Temperature grade — indoor use only
The operating temperature range is 0°C to 70°C, which is commercial grade.
Sourcing and lifecycle — active, no LTB risk
The LM330T-5.0/NOPB is listed as Active on the lifecycle record. There is no last-time-buy notice, no NRND (Not Recommended for New Designs) flag, and no announced end-of-life. It is a current-production part from Texas Instruments, ROHS3 compliant. For new designs, it is a safe choice — no imminent obsolescence risk. For existing BOMs, it is a stable line item. The /NOPB suffix indicates lead-free / ROHS3 compliant plating on the leads, which is the standard now for most TI through-hole parts. If you have an older BOM that specifies the non-/NOPB version (which may have had tin-lead plating), the /NOPB version is a drop-in replacement electrically and mechanically, but verify your soldering process is compatible with lead-free finishes.