LM394N National Semiconductor, LM394N Datasheet

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LM394N

Manufacturer Part Number
LM394N
Description
IC TRANS SUPER MATCH 8-DIP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM394N

Transistor Type
2 NPN (Dual)
Current - Collector (ic) (max)
20mA
Voltage - Collector Emitter Breakdown (max)
35V
Vce Saturation (max) @ Ib, Ic
100mV @ 100µA, 1mA
Power - Max
500mW
Mounting Type
Through Hole
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Collector Cutoff (max)
-
Frequency - Transition
-
Dc Current Gain (hfe) (min) @ Ic, Vce
-
Other names
*LM394N
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
1
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
I
OUT
e
10
b
TL H 9241
5
10 V
IN
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
Y
Y
Y
Y
Y
Y
Y
Y
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
FE
I
) matched to 2%
OUT
e
10
b
6
(V
IN
A to 1 mA collector
)
2
RRD-B30M115 Printed in U S A
December 1994
TL H 9241 – 2

Related parts for LM394N

LM394N Summary of contents

Page 1

... V e OUT IN C 1995 National Semiconductor Corporation TL H 9241 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 ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications (Note 4) Collector Current Collector-Emitter Voltage Collector-Emitter Voltage LM394C Collector-Base Voltage LM394C Collector-Substrate Voltage LM394C Collector-Collector Voltage LM394C Electrical Characteristics Parameter ...

Page 3

Typical Applications (Continued) Fast Accurate Logging Amplifier V Voltage Controlled Variable Gain Amplifier R8–R10 and D2 provide a temperature Distortion independent gain control G 336 V1 (dB 10V ...

Page 4

Typical Applications (Continued) Precision Low Drift Operational Amplifier High Accuracy One Quadrant Multiplier Divider (X) ( OUT (Z) Typical linearity 0 1% positive inputs only 4 Common-mode range 10V BIAS ...

Page 5

Typical Applications (Continued) High Performance Instrumentation Amplifier Linearity of Gain ( 10V Output) g Common-Mode Rejection Ratio (60 Hz) Common-Mode Rejection Ratio (1 kHz) Power Supply Rejection Ratio Supply a Supply b Bandwidth ( 3 dB) b Slew Rate Offset ...

Page 6

Typical Performance Characteristics Small Signal Current Gain vs Collector Current Offset Voltage Drift vs Initial Offset Voltage Small Signal Output Conductance vs Collector Current Base Current Noise vs Frequency DC Current Gain vs Temperature Base-Emitter On Voltage vs Collector Current ...

Page 7

Typical Performance Characteristics Collector to Collector Capacitance vs Collector-Substrate Voltage Collector-Base Leakage vs Temperature Low Frequency Noise of Differential Pair Unit must be in still air environment so that differential lead temperature is held to less than 0 0003 C ...

Page 8

... Connection Diagrams Metal Can Package Top View Order Number LM194H 883 LM394H LM394BH or LM394CH See NS Package Number H06C Available per SMD 5962-8777701 Dual-In-Line and Small Outline Packages TL H 9241– 12 Top View Order Number LM394N or LM394CN See NS Package Number N08E 9241 – 13 ...

Page 9

Physical Dimensions inches (millimeters) Order Number LM194H 883 LM394H LM394BH or LM394CH Metal Can Package (H) NS Package Number H06C 9 ...

Page 10

... Physical Dimensions inches (millimeters) (Continued) Order Number LM394CN or LM394N LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or ...

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