National Semiconductor Semiconductors Linear 1.C.s Voltage Regulators L340 Series Positive Voltage Regulators REFERENCE TABLE Code Stock No. Code Stock No. LM340-05K 33140H LM340-05T 33147E LM340-06K 33141F LM340-06T~- 33148C LM340-08K 33142D LM340-08T 33149A LM340-12K 33143B LM340-12T 33150D LM340-15K 33144X LM340-15T 331518 LM340-18K 33145R LM340-18T 33152X LM340-24K 331466 LM340-24T 33153R VOLTAGE RANGE LM340-05 5V L.M340-06 6V LM340-08 8V LM340-12 12V LM340-15 15V LM340-18 18V LM340-24 24V GENERAL DESCRIPTION . The LM340-XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications, One of these is local on-card regulation, eliminating the distribution problems associated with single point regulation, The voltages available allow these regulators to be used in logic systems, instrument- ation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators these devices can be used with external components to obtain adjustable voltages and currents, The LM340-XX series is available in two power packages. Both the plastic TO-220 and metal TO-3 packages allow these regulators to deliver over 1.0A if adequate heat sinking is provided. Even with over 1.0A of output current available the regulators are essentially blow-out proof. Current limiting is included to limit the peak output current to a safe value. Safe area protection for the output transistor is provided to limit internal power dissipation. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over, preventing the IC from overheating. Considerable effort was expended to make the LM340-XX 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. FEATURES . Output current in excess of 1A internal thermal overload protection No external components required Output transistor safe area protection Internal short circuit current limit Available in plastic TO-220 and metal TO-3 packages CONNECTION DIAGRAM TO~3(K) Output GND(3)} Ingut Bottom View See outline drawing No. 94 for dimensions. CONNECTION DIAGRAM TO-220(T) Top View See outline drawing No, 87 for dimensions, ABSOLUTE MAXIMUM RATINGS Input voltage (Vo =5V 35V through 18V) - (Vo =24V) 40V internally timited Internal power dissipation (Note 1) Operating temperature 0C to 70C range Maximum junction temperature TO-3 Package TO-220 Package 150C 125C Storage temperature range 65C to 150C Lead temperature TO-3 Package (Soldering, 10 sec) 300C TO-220 Package (Soldering, 10 sec) 230C MANUFACTURER'S CURRENT LIST PRICES ARE ALWAYS CHARGED