Quality bipolar fabrication is mainly used in the MC33172/MC33174/MC33171 series monolithic ICs with modern design concepts. This series of ICs function from split power supplies which are suitable for single supply operation due to the ground potential in common mode input voltage. These monolithic series ICs are specified over the automotive or industrial temperature ranges. The whole sequence of single, dual & quad operational amplifiers is available in surface-mount and plastic packages. These ICs exhibit high gain, low input offset voltage & high input resistance with a Darlington input stage. This article provides brief information on the MC33171 op-amp, pin configuration, specifications & its applications.
What is the MC33171 Op-Amp?
MC33171 is a high-power operational amplifier and its voltage range is from 3V to 44V. This op-amp belongs to the series MC33171/72/74 and NCV33172/74 series. This pin configuration is well-matched with the basic op-amps to perform nearly all the standard op-amps applications. In addition, this IC supports 1.8MHz of bandwidth & consumes much less than 180 µA of current per amplifier.
The MC33171 op-amp is very simple to use in any circuit as an inverting amplifier as well as a non-inverting amplifier. In the inverting mode of this op-amp, when voltage signal is provided at both the pins like 2 & 3 is grounded then the polarity of the o/p signal attained is quite reverse to the input signal. So the inverting amplifier equation is:
Vout = (-Rf/R1) Vin.
Here, the op-amp will be in non-inverting amplifier mode, pin 3 is connected to a voltage signal & pin 2 is grounded. After that, the output polarity attained will be similar to the input signal’s polarity. The non-inverting amplifier equation is:
Vout = (Rf/R1) Vin
The applied input voltage values should lie between the voltage supply values VEE & Vcc.
Pin Configuration:
The pin configuration of MC33171 IC is shown below. This IC includes 8 pins which are discussed below.
MC33171 IC Pin Configuration
- Pins – 1,5 (Offset Null): An offset null pin is used to set offset voltage based on requirement.
- Pin-2 (IN-): IN- pin is an inverting input of the op-amp.
- Pinp-3 (IN+): The IN+ pin is a Non-inverting input pin of the op-amp.
- Pin-4 (V-): V- pin is connected to GND or negative rail.
- Pin-6 (Output): This is the output pin of the op-amp.
- Pin-7 (V+): The V+ pin is connected to the +ve rail of the voltage supply.
- Pin-8 (NC): The NC pin is non-connected.
Features & Its Specifications:
The features and specifications of the MC33171 op amp include the following.
- It is an operational amplifier.
- It has low power consumption like 200µA only.
- Its Gain bandwidth product is 2.1 MHz.
- Its slew rate is 2 V/us.
- It is compatible with other single op-amps.
- Its gain margin is excellent – 15 dB
- Its voltage supply ranges from 4V to 44 V.
- Its output current for each channel is 27 mA.
- It has one channel.
- Its common mode rejection ratio or CMRR is 80 dB.
- Its operating temperature ranges from -40°C to +105°C.
- Its input bias current or Ib is 100 nA.
- Its input offset voltage or Vos is 5 mV.
- Its operating current supply is 250 uA.
- Its total harmonic distortion or THD is Low – 0.03%
- It has an outstanding 60° phase margin.
- It has an outstanding 15 dB gain margin.
- It has o/p short circuit protection.
Equivalent & Alternatives
The equivalent MC33171 op-amps are; UA741, TL081 & CA3140. An alternative MC33171 op-amps are; LM4871, IC6283, AD620, LF351N & JRC45558.
Selection of an op-amp for a particular application is very important based on the requirements. To know more about this, please refer to this How to Choose an Op-Amp?
Peak Detector Circuit using MC33171 IC
The peak detector circuit decides the maximum value of the input signal for the op-amp. It stores simply the maximum input voltage value for the infinite time period until it approaches to reset condition. This simple circuit uses the highest input signal value & stores it. Generally, rectifier circuits provide an o/p in proportion to the normal i/p value. However, a peak detector is used to measure the peak value of a signal is some applications.
This circuit can be designed with MC33171 op-amp, diode, capacitor, and switch. Connect this circuit as per the simple circuit diagram shown below. This peak detector circuit does not need any complex component to decide the peak of the i/p signal.
Peak Detector Circuit using MC33171 IC
Working
The peak detector circuit working principle is, that the input signal’s peak is followed and stored in the capacitor in terms of voltage. So, when this circuit detects a high peak, then a new peak value is stored in the capacitor until that value is discharged.
When the input signal is applied to the circuit, the capacitor is charged throughout the diode, a small amount of voltage drop across the diode is ignored and the capacitor is charged to the maximum peak of the applied input signal.
If we consider the capacitor in this circuit is charged to Vc voltage. When the input voltage of the circuit exceeds the capacitor voltage, then the diode will get forward-biased. So this circuit behaves as a voltage follower and the o/p voltage of the circuit follows the applied input voltage until it is above the capacitor voltage ‘Vc’.
The input voltage of the circuit reduces to the capacitive voltage value, then the diode in the circuit gets reverse-biased. Thus, the capacitor keeps the value until the input exceeds the stored value again in the capacitor.
This circuit is useful in analyzing the spectral and mass spectrometer. And also, used in sound-measuring instruments, destructive testing, instrumentation measurement, and frequently in amplitude-modulated wave communication.
Advantages & Disadvantages
The advantages of the MC33171op amp include the following.
- This IC with a single supply.
- It has o/p short circuit protection, outstanding phase margin, and gain margin.
- This op-amp offers low power consumption & good speed.
- The main drawback of this amp is slow response time (or) slew rate so they cannot switch the o/p voltage fast enough for fast-changing or high-frequency signals.
MC33171 Op-Amp Applications
The applications of the MC33171 op amp include the following.
- MC33171 op-amp performs integration operations in electronic and electrical circuits by connecting a capacitor in the feedback loop.
- This op amp provides a wider selection as compared to any earlier-developed IC.
- This monolithic IC helps convert voltage (V) to current (I) by providing a voltage supply to the non-inverting terminal and negative feedback to the op-amp.
- This op-amp helps in designing selective inversion circuits, voltage follower circuits, active filters, sample & hold amplifiers, comparators, peak detectors, function generators, low-voltage supply systems, etc.
Please refer to this link to learn more about the MC33171 Op-Amp Datasheet.
Thus, this is an overview of the MC33171 op-amp, pinout, specifications, circuit, and its applications. This IC is available in a single package, used widely in many general-purpose applications like; comparators, voltage followers, amplifiers, buffers, adders, etc, These are also suitable in fundamental electronic circuit designs. The MC3x171 series IC is a single bipolar op amp that provides both good speed & low consumption. Here is a question for you, what is MC33174 IC?