ST UA741 User Manual

General-purpose single operational amplifier

Features

■ Large input voltage range

■ No latch-up

■ High gain

■ Short-circuit protection

■ No frequency compensation required

■ Same pin configuration as the UA709

Applications

■ Summing amplifiers

■ Voltage followers

■ Integrators

■ Active filters

■ Function generators

UA741

N

DIP8

(plastic package)

D

SO-8

(plastic micropackage)

Pin connections

(top view)

Description

The UA741 is a high performance monolithic
operational amplifier constructed on a single
silicon chip. It is intended for a wide range of
analog applications.

The high gain and wide range of operating
voltages provide superior performances in
integrator, summing amplifier and general
feedback applications. The internal compensation
network (6 dB/octave) ensures stability in closed­loop circuits.

1

2

3

4

8

7

6

5

1 - Offset null 1

2 - Inverting input

3 - Non-inverting input

4 - V

CC

-

5 - Offset null 2

6 - Output

7 - V

CC

+

8 - N.C.

May 2009 Doc ID 5304 Rev 2 1/11

www.st.com

11

Schematic diagram UA741

1 Schematic diagram

Figure 1. Schematic diagram

Non-Inverting input

Vcc+

Offset
null 2

Offset

R2

1kW

input

null 1

Q12

Q9

C1

30pF

R5

39kW

Q11

Q10

Q22

R4

5kW

R12

50kW

R7

4.5kW

R8

7.5kW

Q13

Q14

Q18

Q16

Q17

Q15

R9

25W

Output

R10
50W

Q20

R11
50W

Vcc-

Q8

Inverting

Q1

Q2

Q3

Q4

Q7

Q5

Q6

R3

50kW

R1

1kW

2/11 Doc ID 5304 Rev 2

UA741 Absolute maximum ratings and operating conditions

2 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

V

V

Supply voltage ±22 V

Differential input voltage ±30 V

id

Input voltage ±15 V

i

Output short-circuit duration Infinite

Thermal resistance junction to ambient

R

thja

SO-8

DIP8

125

85

°C/W

Thermal resistance junction to case

R

thjc

ESD

T

stg

1. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a

1.5kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.

2. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.

3. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.

Table 2. Operating conditions

SO-8

DIP8

HBM: human body model

(1)

DIP package
SO package

MM: machine model

(2)

CDM: charged device model

(3)

40

°C/W

41

500
400

100 V

1.5 kV

Storage temperature range -65 to +150 °C

V

Symbol Parameter UA741I UA741C Unit

V

CC

V

icm

T

oper

Supply voltage 5 to 40 V

Common mode input voltage range ±12 V

Operating free air temperature range -40 to +105 0 to +70 °C

Doc ID 5304 Rev 2 3/11

Electrical characteristics UA741

3 Electrical characteristics

Table 3. Electrical characteristics at VCC = ±15 V, T

= +25° C

amb

(unless otherwise specified)

Symbol Parameter Min. Typ. Max. Unit

Input offset voltage (Rs ≤ 10 kΩ)

V

I

io

I

ib

A

vd

SVR

I

CC

V

icm

CMR

I

OS

±V

opp

SR

t

io

r

T
T

amb

min

= +25° C

≤ T

≤ T

amb

max

15

6

Input offset current

T
T

amb

min

= +25° C

≤ T

≤ T

amb

max

230

70

Input bias current

T
T

amb

min

= +25° C

≤ T

≤ T

amb

max

10 100

200

Large signal voltage gain (Vo = ±10 V, RL = 2 kΩ)

T

= +25° C

amb

≤ T

amb

≤ T

max

T

min

Supply voltage rejection ratio (R

= +25° C

T

amb

T

≤ T

amb

≤ T

max

min

≤ 10 kΩ)

s

50
25

77
77

200

90

Supply current, no load

T
T

amb

min

≤ T

= +25° C

≤ T

amb

max

1.7 2.8

3.3

Input common mode voltage range

T

= +25° C

amb

≤ T

amb

≤ T

max

T

min

Common mode rejection ratio (R

= +25° C

T

amb

T

≤ T

amb

≤ T

max

min

≤ 10 kΩ)

S

±12
±12

70
70

90

Output short circuit current 10 25 40 mA

Output voltage swing

T

= +25° C RL = 10 kΩ

amb

R

T

≤ T

≤ T

min

amb

RL = 10 kΩ

max

R

= 2 kΩ

L

= 2 kΩ

L

12
10
12
10

14
13

Slew rate

= ±10 V, RL = 2 kΩ, CL = 100 pF, unity gain 0.25 0.5

V

i

Rise time

Vi = ±20 mV, RL = 2 kΩ, CL = 100 pF, unity gain 0.3

mV

nA

nA

V/mV

dB

mA

V

dB

V

V/μs

μs

K

Overshoot

ov

R

i

Vi = 20 mV, RL = 2 kΩ, CL = 100 pF, unity gain 5

Input resistance 0.3 2 MΩ

4/11 Doc ID 5304 Rev 2

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