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LM393X, LM394, LM3940

Table of contents:
Info of LM393X
Info of LM394
Info of LM3940

LM393X, LM394, LM3940 Selling Leads, Datasheet

MFG:PHI Package Cooled:3.9mm D/C:99

LM393X, LM394, LM3940 Datasheet download

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Part Number: LM393X

MFG: PHI

Package Cooled: 3.9mm

D/C: 99

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LM393X Parameters

LM3940 Features

Output voltage specified over temperature
Excellent load regulation
Guaranteed 1A output current
Requires only one external component
Built-in protection against excess temperature
Short circuit protected

LM393X General Description

IA Low Dropout Regulator for 5V to 3.3V Conversion

LM393X Features

Output voltage specified over temperature
Excellent load regulation
Guaranteed 1A output current
Requires only one external component
Built-in protection against excess temperature
Short circuit protected

LM393X Typical Application

LM3940 Datasheet

LM394 General Description

The LM194 and LM394 are junction isolated ultra wellmatched monolithic NPN transistor pairs with an order of magnitude improvement in matching over conventional transistor pairs. This was accomplished by advanced linear processing and a unique new device structure.

Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic emitter and base resistances are much lower than presently available pairs, either monolithic or discrete, giving extremely low noise and theoretical operation over a wide current range.

Most parameters are guaranteed over a current range of 1 mA to 1 mA and 0V up to 40V collector-base voltage, ensuring superior performance in nearly all applications. To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitterbase junction of each transistor. These prevent degradation due to reverse biased emitter currentÐthe most common cause of field failures in matched devices. The parasitic isolation junction formed by the diodes also clamps the substrate region to the most negative emitter to ensure complete isolation between devices.

The LM194 and LM394 will provide a considerable improvement in performance in most applications requiring a closely
matched transistor pair. In many cases, trimming can be eliminated entirely, improving reliability and decreasing costs. Additionally, the low noise and high gain make this device attractive even where matching is not critical.

The LM194 and LM394/LM394B/LM394C are available in an isolated header 6-lead TO-5 metal can package. The LM394/LM394B/LM394C are available in an 8-pin plastic dual-in-line package. The LM194 is identical to the LM394 except for tighter electrical specifications and wider temperature range.

LM394 Maximum Ratings

Collector Current .............. 20 mA
Collector-Emitter Voltage ..........VMAX
Collector-Emitter Voltage .......... 35V
LM394C ....................   20V
Collector-Base Voltage............ 35V
LM394C....................   20V
Collector-Substrate Voltage ........ 35V
LM394C ....................   20V
Collector-Collector Voltage ......... 35V
LM394C ..................      20V
Base-Emitter Current .........  ±10 mA
Power Dissipation............ 500 mW
Junction Temperature
LM194 .............. -55 to +125
LM394/LM394B/LM394C .... -25 to a85
Storage Temperature Range .-65 to +150
Soldering Information
Metal Can Package (10 sec.) ......   260
Dual-In-Line Package (10 sec.) ..... 260
Small Outline Package
Vapor Phase (60 sec.) ........... 215
Infrared (15 sec.) .............. 220

LM394 Features

· Emitter-base voltage matched to 50 mV
· Offset voltage drift less than 0.1 mV/§C
· Current gain (hFE) matched to 2%
· Common-mode rejection ratio greater than 120 dB
· Parameters guaranteed over 1 mA to 1 mA collector current
· Extremel· low noise
· Superior logging characteristics compared to conventional pairs
· Plug-in replacement for presentl· available devices

LM3940 Parameters

LM3940 Features

Output voltage specified over temperature
Excellent load regulation
Guaranteed 1A output current
Requires only one external component
Built-in protection against excess temperature
Short circuit protected

LM3940 General Description

IA Low Dropout Regulator for 5V to 3.3V Conversion

LM3940 Maximum Ratings

Storage Temperature Range                                      −65˚Cto+150˚C
Operating Junction Temperature Range                     −40˚Cto+125˚C
Lead Temperature (Soldering,5 seconds)                                  260˚C
Power Dissipation (Note2)                                       InternallyLimited
Input Supply Voltage                                                                  7.5V
ESD Rating (Note3)                                                                       2kV

LM3940 Features

Output voltage specified over temperature
Excellent load regulation
Guaranteed 1A output current
Requires only one external component
Built-in protection against excess temperature
Short circuit protected

LM3940 Typical Application

LM3940 Datasheet

LM3940 Connection Diagram

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