MC33272AD: High-Performance Dual Operational Amplifier - Complete Guide

The MC33272AD from Onsemi is a premium dual operational amplifier that delivers exceptional speed, precision, and versatility for demanding analog applications. This comprehensive guide explores its technical specifications, design advantages, and real-world use cases to help engineers maximize its potential.

In-Depth Product Analysis

Technical Specifications

• Architecture: Dual-channel general-purpose op-amp with independent circuits
• Bandwidth: 24MHz gain-bandwidth product for high-frequency stability
• Slew Rate: 10V/ s enables fast signal response
• Precision: Ultra-low 300nA input bias current and 100 V offset voltage
• Power Efficiency: Only 2.15mA per channel (4.3mA total)
• Voltage Range: Wide 3V to 36V single/dual supply operation
• Robustness: -40 C to +85 C industrial temperature range
• Package: Space-saving 8-SOIC (3.90mm width) surface-mount design

Performance Advantages

The MC33272AD stands out with its optimized speed-power ratio, delivering 24MHz bandwidth while consuming minimal current. Its rail-to-rail output swing (within 1V of supplies) and 37mA output drive capability make it suitable for both precision and power applications.

Detailed Applications

1. Precision Instrumentation

The amplifier's low noise (8nV/ Hz at 10kHz) and high CMRR (100dB) enable accurate signal conditioning in:

• Medical diagnostic equipment
• Strain gauge amplifiers
• High-resolution data acquisition systems

2. Audio Systems

With 0.0005% THD+N and fast settling time, it's ideal for:

• Professional audio mixers
• Hi-fi preamplifiers
• Active crossover networks

3. Industrial Control

The wide temperature range and robust design support:

• Process control loops
• Motor drive circuits
• PLC analog interfaces

Design Considerations

PCB Layout Guidelines

• Use ground planes and minimize trace lengths for high-frequency stability
• Implement proper decoupling (0.1 F ceramic + 1 F tantalum per supply pin)
• Keep sensitive inputs away from output traces

Thermal Management

While the 8-SOIC package has 160 C/W JA, for continuous high-current operation:

• Maintain ambient temperature below 85 C
• Consider using thermal vias for heat dissipation

Comparison with Modern Alternatives

While newer op-amps exist, the MC33272AD offers unique advantages:

Parameter	MC33272AD	Modern Equivalent
Cost	Lower	Higher
Availability	Wide through distributors	Potential lead time issues
Proven Reliability	15+ years field history	Newer reliability data

Purchasing Information

Available through authorized distributors with:

• Standard packaging (2500 units/reel)
• Evaluation boards for prototyping
• Technical support documentation

Conclusion

The MC33272AD remains a top choice for engineers needing a balanced combination of speed, precision, and power efficiency. Its robust design and proven performance make it particularly valuable for industrial, audio, and instrumentation applications where reliability cannot be compromised.

For design assistance or volume pricing, contact our technical sales team today. We provide full datasheets, SPICE models, and application notes to support your development process.