The voltage regulator is in reverse breakdown, within a certain,current range (or within a certain power loss range)
The terminal voltage is almost constant, showing a voltage regulation characteristic, so it is widely used in a regulated power supply and limiting circuit.
These regulators can provide local on‑card regulation, eliminating the distribution problems associated with single point regulation
Each type employs internal current limiting, thermal shut‑down and safe area protection, making it essentially indestructible
Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents.