Datasheet > LM394H

LM394H

更新时间： 2024-11-22 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	223K
描述
LM194/LM394 Supermatch Pair

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LM394H 数据手册

December 1994

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.

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.

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

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

ensuring superior performance in nearly all applications.

Features

Emitter-base voltage matched to 50 mV

Offset voltage drift less than 0.1 mV/ C

Current gain (h ) matched to 2%

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 currentÐthe 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.

Common-mode rejection ratio greater than 120 dB

Parameters guaranteed over 1 mA to 1 mA collector

current

Extremely low noise

Superior logging characteristics compared to

conventional pairs

Plug-in replacement for presently available devices

The LM194 and LM394 will provide a considerable improve-

ment in performance in most applications requiring a closely

Typical Applications

Low Cost Accurate Square Root Circuit

Low Cost Accurate Squaring Circuit

(V )

10 V

OUT

TL/H/9241–2

TL/H/9241–1

*Trim for full scale accuracy

1995 National Semiconductor Corporation

TL/H/9241

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...10

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与LM394H相关器件

型号	品牌	获取价格	描述	数据表
LM394H/NOPB	TI	获取价格	TRANSISTOR 20 mA, 35 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, METAL CAN-6, BIP Gene
LM394N	NSC	获取价格	LM194/LM394 Supermatch Pair
LM395	NSC	获取价格	Ultra Reliable Power Transistors
LM39500	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator
LM39500_08	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator
LM39500-1.5	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator
LM39500-1.8	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator
LM39500-2.5	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator
LM39500-3.3	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator
LM39500-5.0	HTC	获取价格	5A Low-Voltage Low-Dropout Regulator

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