STMicroelectronics MC33172N

Overview

MC33172N from STMicroelectronics is a low-power dual bipolar operational amplifier designed for single- or dual-supply operation across +4 V to +44 V (±2 V to ±22 V). It delivers 2.1 MHz gain-bandwidth, 2 V/µs slew rate, and rail-to-rail input common-mode range down to V_CC−, enabling precision signal conditioning in industrial sensor interfaces and 24 V PLC analog front-ends.

For engineers reviewing the MC33172N datasheet, MC33172N pinout, MC33172N application, or MC33172N equivalent, key selection criteria include its 200 µA per amplifier quiescent current, 100 mV typical low-level output voltage swing above V_CC−, and −40°C to +105°C operating temperature range-critical for reliable performance in unregulated power rail environments.

Technical Context

The MC33172N employs a bipolar input stage with complementary NPN/PNP differential pairs, enabling wide input common-mode voltage range extending to V_CC−. Its internal compensation ensures stable unity-gain operation with 45° phase margin at 100 pF capacitive load.

Output stage uses Class AB push-pull topology with current-limiting protection, delivering ±27 mA sink/source capability while maintaining 100 mV low-level output voltage under 10 kΩ load-optimized for driving resistive loads directly from single-supply rails.

Key Specifications

Pinout & Package

DIP8 plastic package (0.3-inch width), through-hole mount, JEDEC MS-001 compliant. RoHS-compliant ECOPACK® with lead-free second-level interconnect.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power operational amplifier applications.

Compared with LM2904DT and TLV2462IDR, the MC33172N uniquely balances ultra-low power (200 µA), industrial temperature range (−40°C to +105°C), and true V_CC−-referenced input-making it optimal for cost-sensitive, thermally demanding, single-supply industrial analog signal chains.

Availability

MC33172N is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC analog input modules, DC motor current sensing, and power supply monitoring requiring stable component supply across long production lifecycles.

Supply support for MC33172N includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad analog portfolio.

The MC33172N belongs to ST's legacy bipolar op-amp product line, engineered specifically for industrial automation applications demanding robustness, wide supply range, and reliable operation under unregulated or noisy power conditions.

FAQ

Is the MC33172N suitable for single-supply operation with a 5 V rail?

Yes. The MC33172N supports single-supply operation from +4 V to +44 V. With a +5 V supply, its input common-mode range extends from ground (V_CC−) to +3.2 V, and its output swings within 100 mV of ground and 3.5 V-enabling effective use in 0–5 V systems without level-shifting circuitry.

What is the maximum capacitive load the MC33172N can drive stably?

The MC33172N is internally compensated for unity-gain stability with up to 100 pF capacitive load, as verified by 45° phase margin in the datasheet. Driving larger capacitive loads (e.g., >200 pF) requires external series resistance (≥100 Ω) at the output to maintain stability and prevent ringing.

Does the MC33172N have built-in ESD protection?

Yes. The MC33172N features integrated ESD protection rated to 2 kV per Human Body Model (HBM), 200 V per Machine Model (MM), and 1 kV per Charged Device Model (CDM), meeting industrial handling requirements without additional external protection components.

Can the MC33172N replace the LM358 in existing designs?

Yes-pin-to-pin compatible with standard dual op-amps including LM358. However, the MC33172N offers lower quiescent current (200 µA vs. 700 µA), wider supply range (+4–44 V vs. +3–32 V), and superior input common-mode range (to V_CC−). Verify layout thermal relief and output loading, as its lower I_Q reduces self-heating in dense PCBs.