OP471 Quad Operational Amplifier

Overview

The OP471 is a high-performance monolithic quad operational amplifier that combines low noise, excellent speed, and precision performance in a single package. Designed for demanding applications, it features unity-gain stability with a gain bandwidth of 6.5 MHz and a typical slew rate of 8 V/µs. The device offers outstanding gain accuracy and linearity with an open-loop gain exceeding 500,000 when driving a 10 kΩ load. Its low input offset voltage (under 0.8 mV) and minimal drift (below 4 µV/°C) make it particularly suitable for precision applications across the full military temperature range.

Features

• Low Noise Performance: 11 nV/√Hz maximum at 1 kHz
• High Speed: 8 V/µs typical slew rate
• Wide Bandwidth: 6.5 MHz typical gain bandwidth product
• Unity-Gain Stable for versatile circuit configurations
• Precision Specifications:
  • Input offset voltage: 0.8 mV maximum
  • Offset voltage drift: 4 µV/°C maximum
• Excellent DC Performance:
  • Open-loop gain: 500,000 minimum into 10 kΩ
  • Input bias current: under 25 nA
• Superior Noise Rejection:
  • CMRR: 105 dB minimum
  • PSRR: 5.6 mV/V maximum
• Industry-Standard Compatibility: Pin-compatible with LM148/LM149, HA4741, RM4156, MC33074, TL084, and TL074 quad op amps

Applications

The OP471's combination of precision and performance makes it ideal for a wide range of applications:

• Precision Instrumentation:
  • Medical instrumentation
  • Test and measurement equipment
  • Data acquisition systems
• Signal Processing:
  • Active filters (low-noise implementations)
  • Analog signal conditioning
  • Precision integrators
• Audio Applications:
  • Professional audio equipment
  • High-fidelity systems
• General Purpose Amplification:
  • Multiple gain blocks
  • Quad buffers
  • Voltage followers
• Industrial Control Systems

Electrical Characteristics

All specifications are guaranteed over the full military temperature range (-55°C to +125°C) unless otherwise noted.

DC Characteristics

• Input Offset Voltage: 0.8 mV maximum
• Input Offset Voltage Drift: 4 µV/°C maximum
• Input Bias Current: 25 nA maximum
• Input Offset Current: 10 nA maximum
• Common Mode Rejection Ratio (CMRR): 105 dB minimum
• Power Supply Rejection Ratio (PSRR): 5.6 mV/V maximum
• Large Signal Voltage Gain: 500 V/mV minimum (RL = 10 kΩ)
• Supply Current (per amplifier): 2.5 mA typical

AC Characteristics

• Slew Rate: 8 V/µs typical
• Gain Bandwidth Product: 6.5 MHz typical
• Input Voltage Noise: 11 nV/√Hz maximum at 1 kHz
• Input Current Noise: 0.5 pA/√Hz typical at 1 kHz
• Settling Time (to 0.1%): 1.5 µs typical for 10V step

Power Supply Characteristics

• Operating Voltage Range: ±4V to ±18V
• Quiescent Current (per amplifier): 2.5 mA typical

Package Information

The OP471 is available in the following package options:

14-Lead Plastic DIP (N Package)

• Dimensions: 19.3mm x 6.35mm x 4.57mm (body)
• Pin Spacing: 2.54mm (100 mil) between pins
• Row Spacing: 7.62mm (300 mil) between rows
• Operating Temperature Range: -55°C to +125°C

14-Lead SOIC (R Package)

• Dimensions: 8.65mm x 3.9mm x 1.5mm (body)
• Pin Spacing: 1.27mm (50 mil) between pins
• Operating Temperature Range: -55°C to +125°C

Pin Configuration

The OP471 follows the industry-standard quad op amp pinout:

• Pin 1: Output A
• Pin 2: Inverting Input A
• Pin 3: Non-Inverting Input A
• Pin 4: V+
• Pin 5: Non-Inverting Input B
• Pin 6: Inverting Input B
• Pin 7: Output B
• Pin 8: Output C
• Pin 9: Inverting Input C
• Pin 10: Non-Inverting Input C
• Pin 11: V-
• Pin 12: Non-Inverting Input D
• Pin 13: Inverting Input D
• Pin 14: Output D

Design Considerations

PCB Layout Guidelines

To achieve optimal performance from the OP471:

• Use a low-impedance ground plane
• Keep input traces short and away from output traces
• Place bypass capacitors (0.1 µF ceramic) close to the power pins
• For high-frequency applications, consider additional 1-10 µF tantalum capacitors on each supply rail

Thermal Considerations

While the OP471 has excellent thermal characteristics:

• Ensure adequate airflow in high-temperature environments