It's a slide on IC-741 op-amp...

1. 741 IC
Presented By:
● Nafisa Tasneem (1509032)
● Showrin Barua (1509048)

2. Introduction
• An integrated circuit is a semiconductor wafer on
which thousands or millions of tiny resistors,
capacitors and transistors are fabricated.
• IC-741 is most commonly used which is an Operational
Amplifier.
625 Million
Transistors
2

3. History
• The IC-741 was designed by Dave Fullager of
Fairchild Semiconductor in 1968.
Genius Creation
3

4. Pin Diagram
1Offset Null
5 Offset Null
The Offset Null pins are used for adjusting offset voltage to obtain
better gain
4

5. Pin Diagram
1Offset Null
5 Offset Null
This pin is used to invert the input voltage at 180°
2Inverting In
4

6. Pin Diagram
1Offset Null
5 Offset Null
This pin does not change the polarity of the given input voltage
2Inverting In
3Non Inverting In
4

7. Pin Diagram
1Offset Null
5 Offset Null
These pins are used for positive and negative supply to the IC
2Inverting In
3Non Inverting In
4-Vcc
7 +Vcc
4

8. Pin Diagram
1Offset Null
5 Offset Null
This pin is used for taking output of the IC
2Inverting In
3Non Inverting In
4-Vcc
7 +Vcc
6 Output
4

9. Pin Diagram
1Offset Null
5 Offset Null
2Inverting In
3Non Inverting In
4-Vcc
7 +Vcc
6 Output
8 Not Connected
4

10. Other Types of 741 IC
5

11. Maximum Ratings
Supply voltage ±18 𝑣𝑜𝑙𝑡𝑠
Internal power dissipation 500mW
Differential input voltage ±30 𝑣𝑜𝑙𝑡𝑠
Input voltage ±15 𝑣𝑜𝑙𝑡𝑠
Voltage offset null/V- ±0.5 𝑣𝑜𝑙𝑡𝑠
Operating temperature range 0° to +70°C
Storage temperature range -65° to +150°C
Lead temperature 300°C
Output short circuit Indefinite
6

12. Block Diagram
Input stage
Intermediate
stage
Level shifting
stage
Output stage
+
-
o/p
i/p
This stage provides most of the voltage gain of the op-amp
and establishes its input resistance
7

13. Block Diagram
Input stage
Intermediate
stage
Level shifting
stage
Output stage
+
-
o/p
i/p
This stage uses unbalanced differential amplifier for
direct coupling. At the output of this stage DC voltage is
above ZERO
7

14. Block Diagram
Input stage
Intermediate
stage
Level shifting
stage
Output stage
+
-
o/p
i/p
This stage uses level translator circuit. It makes the DC
voltage downward to ZERO with respect to ground.
7

15. Block Diagram
Input stage
Intermediate
stage
Level shifting
stage
Output stage
+
-
o/p
i/p
This stage uses complementary push-pull amplifier. It
increases the output voltage swing and raises current
supplying capability of the op-amp. It also establishes low
output impedance.
7

16. Important Specifications
i. Input offset voltage
ii. Input offset current
iii.Input bias current
iv.Slew rate
v. CMRR (Common mode rejection ratio)
8

17. Important Specifications
i. Input offset voltage :
It is the voltage that must be applied between
the two input terminals of an op-amp to null the output
voltage.
Vio = Vdc1 – Vdc2
9

18. Important Specifications
ii. Input offset current :
It is the algebraic difference of two input
currents that flow into the inverting and non-inverting
terminals of an op-amp.
Iio = | IB1 – IB2 |
10

19. Important Specifications
iii. Input bias current :
It is the average of two input currents that
flow into the inverting terminal of an op-amp.
IB = (IB1 + IB2) / 2
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20. Important Specifications
iv. Slew rate:
It is defined as the maximum change of output
voltage per unit time and expressed as v/μs.
SR =
𝑑𝑉0
𝑑𝑡
|max
12

21. Important Specifications
v. CMRR:
Common mode rejection ratio is generally
defined as the ratio of differential voltage gain (Ad) to the
common mode voltage gain (Acm).
CMRR =
𝐴 𝑑
𝐴 𝑐𝑚
&
Acm =
𝑉 𝑜𝑐𝑚
𝑉 𝑐𝑚
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22. Important Features
i. Short circuit and overload protection provided.
ii. Low power consumption.
iii. Large common mode rejection ratio (CMRR) and
differential voltage ranges.
iv. No external frequency compensation is required
v. No latch-up problem.
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23. Important Applications (1/4)
Headphone Amplifier
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24. Important Applications (2/4)
Electronic
Thermometer
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25. Important Applications (3/4)
Electronic
Fuse
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26. Important Applications (4/4)
Earthquake
Detector
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27. Future
We have seen that many sectors have been developed
using IC 741. As we are future electronics engineers,
the future of IC 741 as well as other electronic devices
depend on us. So it is our responsibility to think
something different . Who knows it (IC 741) may create
a new dimension in modern electronics!
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28. References
i. Op-amps and linear integrated circuits
- Ramakant A. Gayakward
ii. Ctcircuitstoday.com
iii. Quora.com
iv. Electroschematics.com
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29. THANK YOU