National Semiconductor LM140L LM340L Series 3- Terminal Positive Regulators Data Sheet User's Guide

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LM140L/LM340L Series 3-Terminal Positive Regulators General Description

The LM140L series of three terminal positive regulators is becomes too high for the heat sinking provided, the thermal available with several fixed output voltages making them shut-down circuit takes over, preventing the IC from over- useful in wide range of applications. The LM140LA is an heating.

improved version of the LM78LXX series with tighter out- For applications requiring other voltages, see LM117L Data put voltage tolerance (specified over the full military temper- Sheet. ature range), higher ripple rejection, better regulation and lower quiescent current. The LM140LA regulators have

Features

g2% VOUT specification, 0.04%/V line regulation, and

Line regulation of 0.04%/V

0.01%/m A load regulation. When used as zener diode/re-

Load regulation of 0.01%/m A

sistor combination replacement, the LM140LA usually re-

Output voltage tolerances of g2% at Tj 25§C and

sults in an effective output impedance improvement of two

g4% over the temperature range (LM140LA)

orders of magnitude, and lower quiescent current. These

g3% over the temperature range (LM340LA)

regulators can provide local on card regulation, eliminating

the distribution problems associated with single point regu- Output current of m A

lation. The voltages available allow the LM140LA to be used Internal thermal overload protection in logic systems, instrumentation, Hi-Fi, and other solid state Output transistor safe area protection electronic equipment. Although designed primarily as fixed

Internal short circuit current limit

voltage regulators, these devices can be used with external

Available in metal TO-39 low profile package

components to obtain adjustable voltages and currents.

(LM140LA/LM340LA) and plastic TO-92 (LM340LA)

The LM140LA/LM340LA are available in the low profile metal three lead TO-39 (H) and the LM340LA are also avail-

Output Voltage Options

able in the plastic TO-92 (Z). With adequate heat sinking the

LM140LA-5.0 5V LM340LA-5.0 5V

regulator can deliver m A output current. Current limiting

is included to limit the peak output current to safe value. LM140LA-12 12V LM340LA-12 12V

Safe area protection for the output transistor is provided to LM140LA-15 15V LM340LA-15 15V limit internal power dissipation. If internal power dissipation

Connection Diagrams

TO-39 Metal Can Package (H)

TL/H/7782–2

Order Number LM140LAH-5.0, LM140LAH-5.0/883, LM140LAH-12,

LM140LAH-12/883, LM140LAH-15, LM140LAH-15/883, LM340LAH-5.0, LM340LAH-12 or LM340LAH-15

See NS Package Number H03A

TO-92 Plastic Package (Z)

TL/H/7782–3

Order Number LM340LAZ-5.0, LM340LAZ-12 or LM340LAZ-15

See NS Package Number Z03A

C1995 National Semiconductor Corporation TL/H/7782 RRD-B30M115/Printed in U. S. A.