STMicroelectronics MC33171N

Introduction to the MC33171N Single Operational Amplifier by STMicroelectronics

The MC33171N from STMicroelectronics is a general-purpose operational amplifier designed for both single and dual supply operation, packaged in a convenient 8-DIP form factor. As a member of the MC3x171 series, the MC33171N offers a balance of low power consumption and robust performance, making it suitable for a wide array of analog signal processing tasks. Its architecture is based on bipolar technology, and the amplifier is optimized for efficiency in low current operational environments.

Main Functions and Advantages of the MC33171N

One of the most notable features of the MC33171N is its exceptionally low supply current requirement, drawing only 200 µA while maintaining a gain bandwidth product of 2.1 MHz and a slew rate of 2 V/µs. This makes it an attractive solution in battery-powered instrumentation, portable equipment, or scenarios where minimizing energy draw is a paramount design concern.

The MC33171N supports a wide supply voltage range, operating effectively from +4 V up to +44 V on a single supply, or ±2 V to ±22 V for dual supply configurations. This flexibility allows engineers to integrate the device into systems where voltage rails may vary, or where specific analog performance is needed across different supply schemes.

The device also boasts a wide input common mode voltage range, reaching down to the lower supply rail—including the negative rail in single-supply designs—thereby enhancing DC signal accuracy especially for single-supply applications. Additionally, its output voltage swing typically comes within 100 mV of the positive supply rail, optimizing the usable dynamic range in precision analog circuits.

MC33171N Electrical Specifications and Performance Metrics

Evaluated at the standard test conditions of ±15 V supply and a load connected to ground at 25 °C, the MC33171N delivers dependable linearity, stable quiescent current, and low input offset values. This performance profile equips it for use in analog front ends, buffering, sensor interfacing, and active filter circuits.

Pin configuration is compatible with other industry-standard single op amps, easing replacement tasks and supporting drop-in implementations. The MC33171N's internal schematic provides an input offset voltage null capability, empowering precise calibration in sensitive measurements.

MC33171N Packaging Details and Physical Dimensions

The MC33171N is available in an industry-standard 8-pin dual in-line package (DIP), engineered for easy insertion into through-hole PCBs, making it a reliable choice for both prototyping and large-scale production. STMicroelectronics also provides surface-mount variants (SO package), providing footprint flexibility for high-density or automated assembly environments. Mechanical dimensions adhere to international norms, ensuring straightforward integration into existing board layouts.

Use Cases and Design Guidelines for the MC33171N

Thanks to its low current draw, ample bandwidth, and broad supply voltage range, the MC33171N is highly suited for analog signal conditioning, active filters, audio pre-amplifiers, instrumentation amplifiers, and industrial process control. Designers should note the wide input common mode range when working with signals near ground or single-rail supplies, as it maximizes input fidelity without external level shifting.

The MC33171N’s pin compatibility with standard single op amps simplifies circuit upgrades and maintenance. When designing precision analog modules, its offset null capability may be especially valuable, enabling fine adjustment to eliminate residual input offset due to PCB parasitics or varying ambient conditions.

Alternative/Replacment Options for the MC33171N

In the product selection and procurement process, engineers may consider alternate models within the MC3x171/MC35171 series for parameter or footprint matching. Furthermore, other general-purpose single op amps that offer similar current consumption, supply voltage range, pin configuration, and performance may also serve as drop-in replacements, provided that the specific application thickness (such as bandwidth and input offset) are fully evaluated against the original MC33171N datasheet.

Conclusion

: Selecting the MC33171N for precision analog designs

The MC33171N operational amplifier from STMicroelectronics stands out as a flexible, low-power, and general-purpose analog solution well-matched to a wide range of electronic design projects. Its combination of low supply current, expansive input range, and robust package choices addresses both performance and manufacturing convenience. For engineers and procurement professionals seeking a reliable single op amp for analog front-end development or system upgrades, the MC33171N merits careful consideration as a dependable, industry-standard component.