OP177 Operational Amplifier

Overview

The OP177 is a precision operational amplifier that delivers the highest level of accuracy and performance available in the market. Designed for applications requiring exceptional stability and minimal error, the OP177 features an ultra-low offset voltage and drift, making it ideal for high-precision analog circuits. Its robust design ensures reliable operation across a wide temperature range, including military-grade environments.

With a maximum offset voltage of just 10 µV at room temperature and 20 µV over the full military temperature range (–55°C to +125°C), the OP177 eliminates the need for external offset voltage adjustments. This results in simplified circuit design and improved system accuracy over time and temperature variations.

Features

• Ultralow Offset Voltage: 10 µV max at 25°C, 20 µV max over –55°C to +125°C.
• Exceptional Offset Voltage Drift: 0.1 µV/°C max ensures long-term stability.
• High Open-Loop Gain: 12 V/µV min, providing excellent signal amplification accuracy.
• Low Noise: 0.1 Hz to 10 Hz noise of 0.35 µV p-p for high-resolution applications.
• Wide Supply Voltage Range: Operates from ±2 V to ±20 V, accommodating diverse power requirements.
• Low Input Bias Current: 1.5 nA max, minimizing errors in high-impedance circuits.
• High Common-Mode Rejection Ratio (CMRR): 126 dB min, reducing sensitivity to common-mode signals.
• High Power Supply Rejection Ratio (PSRR): 126 dB min, ensuring stable performance despite supply variations.
• Military Temperature Range: Fully specified for operation from –55°C to +125°C.

Applications

The OP177 is suited for a wide range of precision applications where accuracy and stability are critical. Key application areas include:

• Precision Instrumentation: Used in high-accuracy measurement devices such as multimeters, strain gauge amplifiers, and bridge sensors.
• Medical Equipment: Ideal for ECG amplifiers, blood glucose monitors, and other medical instrumentation requiring low noise and high precision.
• Industrial Control Systems: Employed in process control, data acquisition systems, and servo control loops where minimal drift is essential.
• Test and Measurement: Suitable for calibration equipment, signal conditioning, and reference voltage amplification.
• Aerospace and Defense: Used in avionics, radar systems, and military-grade electronics due to its rugged temperature performance.
• Audio Processing: Provides low-distortion amplification in high-fidelity audio applications.

Electrical Characteristics

The following table summarizes the key electrical specifications of the OP177 under typical operating conditions (unless otherwise noted):

DC Characteristics

• Input Offset Voltage (V_OS): 10 µV max at 25°C, 20 µV max over –55°C to +125°C.
• Offset Voltage Drift (TCV_OS): 0.1 µV/°C max.
• Input Bias Current (I_B): 1.5 nA max.
• Input Offset Current (I_OS): 0.5 nA max.
• Open-Loop Gain (A_VOL): 12 V/µV min.
• Common-Mode Rejection Ratio (CMRR): 126 dB min.
• Power Supply Rejection Ratio (PSRR): 126 dB min.

AC Characteristics

• Gain Bandwidth Product (GBW): 0.6 MHz typical.
• Slew Rate (SR): 0.3 V/µs typical.
• 0.1 Hz to 10 Hz Noise: 0.35 µV p-p.

Power Supply Characteristics

• Supply Voltage Range: ±2 V to ±20 V.
• Quiescent Current (I_Q): 1.2 mA typical per amplifier.
• Operating Temperature Range: –55°C to +125°C.

Package Information

The OP177 is available in multiple package options to suit various application requirements. The following packages are offered:

• 8-Pin PDIP (Plastic Dual In-Line Package): Industry-standard through-hole package for easy prototyping and testing.
• 8-Pin SOIC (Small Outline Integrated Circuit): Surface-mount package for space-constrained applications.
• TO-99 Metal Can: Hermetically sealed package for high-reliability and military applications.

Package Dimensions

• PDIP-8: 9.81 mm x 6.35 mm body, 2.54 mm pin spacing.
• SOIC-8: 4.90 mm x 3.90 mm body, 1.27 mm pin spacing.
• TO-99-8: 9.08 mm diameter, 0.51 mm lead diameter.

Thermal Characteristics

• Junction-to-Ambient Thermal Resistance (θ_JA): 160°C/W (PDIP), 200°C/W (SOIC).
• Junction-to-Case Thermal Resistance (θ_JC): 45°C/W (TO-99).

Conclusion

The OP177 operational amplifier sets the benchmark for precision performance, offering unmatched offset voltage, drift, and stability. Its robust electrical characteristics and flexible packaging options make it an excellent choice for demanding applications in instrumentation, medical, industrial, and aerospace sectors. Engineers can rely on the OP177 to deliver consistent, high-accuracy performance even in the most challenging environments.