LF441.PDF

February 1995

LF441 Low Power JFET

Input Operational Amplifier

General Description

The LF441 low power operational amplifier provides many

of the same AC characteristics as the industry standard

LM741 while greatly improving the DC characteristics of the

LM741. The amplifier has the same bandwidth, slew rate,

and gain (10 k X load) as the LM741 and only draws one

tenth the supply current of the LM741. In addition, the well

matched high voltage JFET input devices of the LF441 re-

duce the input bias and offset currents by a factor of 10,000

over the LM741. A combination of careful layout design and

internal trimming guarantees very low input offset voltage

and voltage drift. The LF441 also has a very low equivalent

input noise voltage for a low power amplifier.

The LF441 is pin compatible with the LM741, allowing an

immediate 10 times reduction in power drain in many appli-

cations. The LF441 should be used where low power

dissipation and good electrical characteristics are the major

considerations.

Features

Y 1/10 supply current of a LM741

200 m A (max)

Y Low input bias current

50 pA (max)

Y Low input offset voltage

0.5 mV (max)

Y Low input offset voltage drift

10 m V/ § C (max)

Y High gain bandwidth

1 MHz

Y High slew rate

1 V/ m s

Y Low noise voltage for low power

35 nV/ S Hz

Y Low input noise current

0.01 pA/ S Hz

Y High input impedance

10 12 X

Y High gain V O e g 10V, R L e 10k

50k (min)

Typical Connection

Ordering Information

LF441XYZ

X indicates electrical grade

Y indicates temperature range

``M'' for military,

``C'' for commercial

Z indicates package type

``H'' or ``N''

TL/H/9297±1

Connection Diagrams

Metal Can Package

Dual-In-Line Package

TL/H/9297±2

Top View

Note: Pin 4 connected to case.

Order Number LF441MH/883

See NS Package Number H08A

TL/H/9297±4

Top View

Order Number LF441ACN,

LF441CM or LF441CN

See NS Package Number M08A or N08E

BI-FET TM is a trademark of National Semiconductor Corporation.

C 1995 National Semiconductor Corporation

TL/H/9297

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

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

LF441A

LF441

Input Voltage Range

(Note 1)

g 19V

g 15V

LF441

Output Short Circuit

Duration

Continuous

Supply Voltage

g 22V

g 18V

Differential Input Voltage

g 38V

g 30V

H Package

N Package

M Package

Power Dissipation

670 mW

(Notes 2 and 9)

T j max

150 § C

115 § C

i jA (Typical)

130 § C/W

185 § C/W

Board Mount in still air

165 § C/W

Board Mount in 400 LF/

65 § C/W

min air flow

i jC

25 § C/W

Operating Temp. Range

(Note 3)

Storage Temp. Range

b 65 § C s T A s 150 § C b 65 § C s T A s 150 § C

Lead Temperature

300 § C

260 § C

(Soldering, 10 seconds)

LF441A

LF441

See AN-450 ``Surface Mounting Methods and Their Effect

on Product Reliability'' for other methods of soldering sur-

face mount devices.

ESD Tolerance (Note 10)

Soldering Information

Dual-In-Line Package

Soldering (10 sec.)

260 § C

Rating to be Determined

Small Outline Package

Vapor Phase (60 sec.)

215 § C

Infrared (15 sec.)

220 § C

DC Electrical Characteristics (Note 4)

Symbol

Parameter

Conditions

LF441A

LF441

Units

Min Typ Max Min Typ Max

V OS

Input Offset Voltage R S e 10 k X ,T A e 25 § C

0.3 0.5

5 mV

Over Temperature

7.5 mV

D V OS / D T Average TC of Input R S e 10 k X (Note 5)

m V/ § C

Offset Voltage

I OS

Input Offset Current V S e g 15V T j e 25 § C

(Notes 4 and 6)

T j e 70 § C

1.5

T j e 125 § C

I B

Input Bias Current

V S e g 15V T j e 25 § C

10 50

10 100 pA

(Notes 4 and 6)

T j e 70 § C

T j e 125 § C

R IN

Input Resistance

T j e 25 § C

10 12

A VOL

Large Signal Voltage V S e g 15V, V O e g 10V,

50 100

25 100

V/mV

Gain

R L e 10 k X ,T A e 25 § C

Over Temperature

V/mV

V O

Output Voltage Swing V S e g 15V, R L e 10 k X g 12 g 13

g 12 g 13

V CM

Input Common-Mode

g 16 a 18, b 17

g 11 a 14, b 12

Voltage Range

CMRR Common-Mode

R S s 10 k X

80 100

70 95

Rejection Ratio

DC Electrical Characteristics (Note 4) (Continued)

Symbol

Parameter

Conditions

LF441A

LF441

Units

Min Typ Max Min Typ Max

PSRR

Supply Voltage

(Note 7)

80 100

70 90

Rejection Ratio

I S

Supply Current

150 200

150 250 m A

AC Electrical Characteristics (Note 4)

Symbol

Parameter

Conditions

LF441A

LF441

Units

Min Typ Max Min Typ Max

Slew Rate

V S e g 15V, T A e 25 § C 0.8 1

0.6 1

V/ m s

GBW Gain-Bandwidth Product

V S e g 15V, T A e 25 § C 0.8 1

0.6 1

MHz

e n

Equivalent Input Noise Voltage T A e 25 § C, R S e 100 X ,

f e 1 kHz

nV/

i n

Equivalent Input Noise Current T A e 25 § C, f e 1 kHz

0.01

pA/

Note 1: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.

Note 2: For operating at elevated temperature, these devices must be derated based on a thermal resistance of i jA .

Note 3: The temperature range is designated by the position just before the package type in the device number. A ``C'' indicates the commercial temperature range

and an ``M'' indicates the military temperature range. The military temperature range is available in ``H'' package only.

Note 4: Unless otherwise specified the specifications apply over the full temperature range and for V S e g 20V for the LF441A and for V S e g 15V for the LF441.

V OS ,I B , and I OS are measured at V CM e 0.

Note 5: The LF441A is 100% tested to this specification.

Note 6: The input bias currents are junction leakage currents which approximately double for every 10 § C increase in the junction temperature, T j . Due to limited

production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient

temperature as a result of internal power dissipation, P D .T j e T A ai jA P D where i jA is the thermal resistance from junction to ambient. Use of a heat sink is

recommended if input bias current is to be kept to a minimum.

Note 7: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice. From

g 15V to g 5V for the LF441 and from g 20V to g 5V for the LF441A.

Note 8: Refer to RETS441X for LF441MH military specifications.

Note 9: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate

outside guaranteed limits.

Note 10: Human body model, 1.5 k X in series with 100 pF.

Typical Performance Characteristics

Input Bias Current

Supply Current

Positive Common-Mode

Negative Common-Mode

Input Voltage Limit

Positive Current Limit

TL/H/9297±5

Typical Performance Characteristics (Continued)

Negative Current Limit

Output Voltage Swing

Gain Bandwidth

Bode Plot

Slew Rate

Undistorted Output

Open Loop Frequency

Response

Distortion vs Frequency

Voltage Swing

Common-Mode

Rejection Ratio

Power Supply

Rejection Ratio

Equivalent Input

Noise Voltage

TL/H/9297±6

Typical Performance Characteristics (Continued)

Open Loop Voltage Gain

Output Impedance

Inverter Settling Time

TL/H/9297±7

Simplified Schematic

TL/H/9297±3

Pulse Response R L e 10 k X ,C L e 10 pF

Small Signal Inverting

TL/H/9297±8

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