The LM340T12 monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they can deliver over 1.0A output current.
They are intended as fixed voltage regulators in a wide
range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation. In addition to use as fixed voltage regulators, these devices can be used with external components to obtain adjustable output voltages and currents. Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply.
Complete specifications at 1A load
Output voltage tolerances of ± = 25°C% over the temperature range
Line regulation of 0.01% of VOUT/V of .VIN at 1A load
Load regulation of 0.3% of VOUT/A
Internal thermal overload protection
Internal short-circuit current limit
Output transistor safe area protection
Datasheet Available:National LM340T12
TO-220 package. Manufactured by National.