The L78xxAB/L78xxAC series of three terminal positive regulators are available in TO-220, TO-220FP, and D2PAK packages and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problem associated with single point regulation. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1 A output current, although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents.
The L78xxAB and L78xxAC series are three‑terminal positive regulators offered in TO‑220, TO‑220FP and DPAK packages. They provide fixed output voltages of 5 V, 6 V, 8 V, 9 V, 12 V, 15 V and 24 V with an output current capability exceeding 1 A. Internal current limiting, thermal shutdown and safe‑area protection make the devices highly robust.
The document includes pin configurations, absolute maximum ratings, thermal resistance data, electrical characteristics, test circuits and ordering information. It also lists revision history and legal notices related to ST products.
| Output current | Exceeds 1 A |
|---|---|
| Output voltages | 5 V, 6 V, 8 V, 9 V, 12 V, 15 V, 24 V |
| Package options | TO‑220, TO‑220FP, DPAK |
| Thermal resistance (junction‑ambient) | 50 °C/W (TO‑220), 60 °C/W (TO‑220FP), 62.5 °C/W (DPAK) |
| Storage temperature range | -65 °C to 150 °C |
| Operating junction temperature range (AB) | -40 °C to 125 °C |
The regulators can deliver an output current in excess of 1 A.
They are offered in TO‑220, TO‑220FP, and DPAK packages.
Fixed output voltages include 5 V, 6 V, 8 V, 9 V, 12 V, 15 V and 24 V.
They can be stored from –65 °C up to 150 °C.