1 Features

1 Short Circuit Protection Offset Voltage Null Capability Large Common Mode and Differential Voltage Range No Frequency Compensation No Latching
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3 Description: The A741 device is a general-purpose operational amplifier with the ability to compensate for the zero position of the voltage.
The high common-mode input voltage range and lack of latching make the amplifier ideal for voltage follower applications. The device adopts short-circuit protection, internal frequency compensation, and no external components are required to ensure stability. As shown in Figure 12, a low value potentiometer can be connected between the offset zero input to make the offset voltage zero.
The μa741c device is characterized by operation at temperatures from 0°C to 70°C.
Device Information (1) Part No. Package Body Size (nom)
A741CD SOIC (8) 4.90mm x 3.91mm
CP PDIP (8) 9.81mm x 6.35mm
A741CPS SO (8) 6.20mm×5.30mm

Pin Configuration and Function
UA741C D, P or PS package 8-pin SOIC, PDIP

Typical characterization data at high and low temperatures apply only within the rated operating free air temperature range of each unit.

Detailed Description Overview The μA741 has been a popular operational amplifier for over 40 years. The typical open-loop gain is 106 dB when driving a 2000 Ω load. Short-circuit tolerance, offset voltage trimming, and unity-gain stability make the μa741 useful in many applications.
Functional block diagram

Functional Description Compensation Voltage Nulling Capability The input offset voltage of an operational amplifier (op amp) is caused by mismatched transistor pairs, collector current, current gain β (β), collector or emitter resistance, etc. caused by the inevitable mismatch of the differential input stage. Input offset pins allow designers to adjust for mismatches caused by external circuitry. For more details on design techniques, see Application and Implementation.
Pad Assignment Chip Thickness: 15 Typical Pads: Minimum 4×4
Tjmax=150°C.
Tolerance is ±10%.
All dimensions are in mils.
UA71
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Functional Description (continued)
The slew rate slew rate is the rate at which the op amp can change the output when the input changes. The slew rate of the A741 device is 0.5-V/µs. Parameters that vary significantly with operating voltage or temperature are shown in Typical Characteristics.
After the device function mode is connected to the power supply, the A741 device is powered on. Depending on the application, the device can operate as a single-supply or dual-supply op amp.
When the μA741Y chip information is properly assembled, the chip shows characteristics similar to the μA741C device. Thermocompression or ultrasonic soldering can be used on doped aluminum pads. Chips can be mounted with conductive epoxy or gold-silicon preforms.

APPLICATIONS AND IMPLEMENTATION NOTE: The information in the following application sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI's customers are responsible for determining the suitability of components for their purpose. Customers should verify and test their design implementation to confirm system functionality.
The input offset voltage of an operational amplifier (op amp) is an unavoidable difference in the differential input stage of the op amp circuit caused by mismatched transistor pairs, collector current, current gain β (β), collector or emitter resistance, etc. caused by a match. Input offset pins allow designers to adjust for mismatches caused by external circuitry. These input mismatches can be adjusted by placing resistors or potentiometers between the inputs, as shown in Figure 12. Potentiometers can trim circuits during testing or in applications that require precise offset control. For more information on designing with input offset pins, see Making an Op Amp's Input Offset Voltage Zero.

Typical Applications The voltage follower configuration of an op amp is used in applications where weak signals drive relatively high current loads. This circuit is also known as a buffer amplifier or unity gain amplifier. The input of the op amp has a very high resistance, which imposes a negligible current load on the voltage source. The output resistance of the op amp is almost negligible, so this resistance can supply the required current to the output load.

Typical Applications (continued)
Design Requirements 8226 ; Output range from 2 V to 11.5 V Input range from 2 V to 11.5 V Resistor feedback to negative input Detailed Design Procedure Output Voltage Swing a certain level. For this amplifier, the output voltage swings within ±12 V to meet input and output voltage requirements.
Power Supply and Input Voltage For proper operation of the amplifier, the input voltage must not be higher than the recommended positive supply rail voltage or lower than the recommended negative supply rail voltage. The selected amplifier must be able to operate at the supply voltage suitable for the input. Since the input voltage for this application is as high as 11.5 V, the supply voltage must be 12 V. Using a negative voltage on the lower rail instead of ground, the amplifier can keep the input voltage linear below 2 V.

Power Supply Recommendations The specified operating voltage for the μa741 device is ±5 to ±15 V; many specifications apply from 0°C to 70°C. Typical characteristics indicate that parameters differ significantly in terms of operating voltage or temperature. Place 0.1µF bypass capacitors close to the power supply pins to reduce false coupling from noise or high impedance power supplies. Refer to the layout guidelines for details on bypass capacitor placement.
CAUTION Safety Supply voltages greater than ±18 V can permanently damage the device (see Absolute Maximum Ratings).
Layout Guidelines For optimum device operation, use good PCB layout practices, including: • Noise can propagate into analog circuits through the circuit's power pins (as a whole) and through the op amp. Bypass capacitors reduce coupled noise by providing a low-impedance power supply locally in the analog circuit. – Connect low ESR, 0.1µF ceramic bypass capacitors between each power supply pin and ground as close to the device as possible. A single bypass capacitor from V+ to ground is suitable for single supply applications. • Separate grounding of the analog and digital parts of a circuit is one of the simplest and most effective methods of noise suppression. One or more layers on a multilayer printed circuit board are typically used for ground planes. Ground planes help dissipate heat and reduce EMI noise. Be sure to physically separate the digital and analog grounds and pay attention to the flow of ground currents. See Board Layout Techniques for more details. • To reduce parasitic coupling, run the input trace as far away from the power supply or output trace as possible. If it is not possible to separate them, it is better to go perpendicular to the sensitive track rather than parallel to the noise track. • Place external components as close to the device as possible. Keeping rf and rg near the inverting input, as shown in the layout example, minimizes parasitic capacitance. • Shorten the length of input traces as much as possible. It is important to remember that the input trace is the most sensitive part of the circuit. • Consider placing a driven low impedance guard ring around critical traces. Guard rings can significantly reduce leakage currents from nearby different potentials.

Layout Example (continued)

Trademarks All trademarks are the property of their respective owners. 11.3 Electrostatic Discharge Considerations These devices have limited built-in ESD protection. During storage or handling, the wires should be shorted together or placed in conductive foam to prevent electrostatic damage to the MOS gate.