LM140L series 3-Terminal Positive Regulators is a three-terminal positive voltage regulator with multiple fixed output voltages, which makes it useful in a wide range of applications. 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. 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 primarily designed as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. LM140LA, LM340LA are available in the low profile metal three lead TO-39 (H) package and the LM340LA are also available in the plastic TO-92 (Z) package. With adequate heat sinking the regulator can deliver 100 mA output current. Current limiting is in the input.
This document describes the LM140LA and LM340LA series of three-terminal positive voltage regulators. These devices are available with fixed output voltages of 5V, 12V, and 15V and feature improved performance over previous generations, including tighter output voltage tolerance and higher ripple rejection.
The datasheet provides detailed electrical characteristics for both the metal TO-39 (H) and plastic TO-92 (Z) packages. It includes absolute maximum ratings, typical performance graphs such as power dissipation versus ambient temperature, and application circuit diagrams for fixed and adjustable output configurations.
| Output Current | 100 mA |
|---|---|
| Line Regulation (LM140LA) | 0.04%/V |
| Load Regulation | 0.01% /mA |
| Output Voltage Tolerance (LM140LA) | +2% |
| Operating Temperature Range (LM140LA) | -55°C to +125°C |
| Operating Temperature Range (LM340LA) | 0°C to +70°C |
The devices are available in low profile metal TO-39 (H) and plastic TO-92 (Z) packages.
The maximum junction temperature shall not exceed 125°C on electrical parameters.