1FEATURES
2• Line Regulation of 0.04%/V
• Load Regulation of 0.01%/mA
• Output Voltage Tolerances of
– ±2% at Tj = 25°C and ±4% Over the
Temperature Range (LM140LA)
– ±3% Over the Temperature Range
(LM340LA)
• Output Current of 100 mA
• Internal Thermal Overload Protection
• Output Transistor Safe Area Protection
• Internal Short Circuit Current Limit
• Available in
– Metal TO Low Profile Package
(LM140LA/LM340LA)
– Plastic TO-92 (LM340LA)

DESCRIPTION
The LM140L series of three terminal positive
regulators is available with several fixed output
voltages making them useful in a wide range of
applications. The LM140LA is an improved version of
the LM78LXX series with a tighter output voltage
tolerance (specified over the full military temperature
range), higher ripple rejection, better regulation and
lower quiescent current. The LM140LA regulators
have ±2% VOUT specification, 0.04%/V line regulation,
and 0.01%/mA load regulation. When used as a
zener diode/resistor combination replacement, the
LM140LA usually results in an effective output
impedance improvement of two orders of magnitude,
and lower quiescent current. These regulators can
provide local on card regulation, eliminating the
distribution problems associated with single point
regulation. The voltages available allow the LM140LA
to be used in logic systems, instrumentation, Hi-Fi,
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 LM140LA/LM340LA are available in the low
profile metal three lead TO (NDT) and the LM340LA
are also available in the plastic TO-92 (LP). With
adequate heat sinking the regulator can deliver 100
mA output current. 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 shut-down circuit takes over,
preventing the IC from overheating.
For applications requiring other voltages, see LM117L
Data Sheet.