LM394BH National Semiconductor, LM394BH Datasheet

LM394BH

Manufacturer Part Number

LM394BH

Description

LM194/LM394 Supermatch Pair

Manufacturer

National Semiconductor

Datasheet

1.LM394BH.pdf (10 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM394BH

Manufacturer:

Quantity:

Company:

BOSTOCK HK LIMITED

Part Number:

LM394BH

Manufacturer:

ATMEL

Quantity:

540

Current page: 1 of 10
Download datasheet (239Kb)

www.DataSheet4U.com

C 1995 National Semiconductor Corporation

LM194 LM394 Supermatch Pair

General Description

The LM194 and LM394 are junction isolated ultra well-

matched monolithic NPN transistor pairs with an order of

magnitude improvement in matching over conventional tran-

sistor pairs This was accomplished by advanced linear pro-

cessing and a unique new device structure

Electrical characteristics of these devices such as drift ver-

sus initial offset voltage noise and the exponential relation-

ship of base-emitter voltage to collector current closely ap-

proach those of a theoretical transistor Extrinsic emitter

and base resistances are much lower than presently avail-

able 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

ensuring superior performance in nearly all applications

To guarantee long term stability of matching parameters

internal clamp diodes have been added across the emitter-

base junction of each transistor These prevent degradation

due to reverse biased emitter current the most common

cause of field failures in matched devices The parasitic iso-

lation junction formed by the diodes also clamps the sub-

strate region to the most negative emitter to ensure com-

plete isolation between devices

The LM194 and LM394 will provide a considerable improve-

ment in performance in most applications requiring a closely

Typical Applications

A to 1 mA and 0V up to 40V collector-base voltage

Low Cost Accurate Square Root Circuit

OUT

TL H 9241

10 V

TL H 9241 – 1

Trim for full scale accuracy

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 temper-

ature range

Features

Emitter-base voltage matched to 50 V

Offset voltage drift less than 0 1 V C

Current gain (h

Common-mode rejection ratio greater than 120 dB

Parameters guaranteed over 1

current

Extremely low noise

Superior logging characteristics compared to

conventional pairs

Plug-in replacement for presently available devices

Low Cost Accurate Squaring Circuit

) matched to 2%

OUT

A to 1 mA collector

)

RRD-B30M115 Printed in U S A

December 1994

TL H 9241 – 2

Related parts for LM394BH

Related keywords

LM394BH datasheet
LM394BH data sheet
LM394BH pdf datasheet
LM394BH component
LM394BH part
LM394BH distributor
LM394BH RoHS
LM394BH datasheet download