Analog Devices Inc./Maxim Integrated MAX44243AUD+T

Overview

MAX44243AUD+T from Maxim Integrated is a 36V, ultra-precision, low-noise, dual operational amplifier featuring chopper-stabilized and auto-zeroing architecture. It delivers 5µV max input offset voltage, 20nV/°C max drift, 9nV/√Hz input voltage noise at 1kHz, rail-to-rail output, and 5MHz gain-bandwidth - ideal for high-accuracy load cell and transducer amplification in industrial PLC analog I/O modules.

For engineers reviewing the MAX44243AUD+T datasheet, MAX44243AUD+T pinout, MAX44243AUD+T application, or MAX44243AUD+T equivalent, key selection criteria include guaranteed -40°C to +125°C operation, 2.7V–36V single-supply capability, EMI-filtered inputs, and verified performance in precision ADC buffer and low-side current-sensing circuits.

Technical Context

The MAX44243AUD+T implements a patented dual-stage correction architecture combining continuous-time chopper stabilization (for 1/f noise suppression) and periodic auto-zeroing (for DC offset cancellation), enabling near-zero long-term drift without sacrificing bandwidth or introducing switching artifacts. Its input stage includes integrated EMI filtering to reject RF interference up to 1GHz.

This dual op amp operates with rail-to-rail output swing, supports ±1.35V to ±18V dual supplies or 2.7V–36V single supply, and maintains 146dB min PSRR and 140dB min CMRR across temperature - critical for high-resolution signal conditioning in noisy industrial environments.

Key Specifications

Pinout & Package

The MAX44243AUD+T is housed in a 14-pin TSSOP package (package code U14M+1), RoHS-compliant, with 0.65mm lead pitch and exposed pad for thermal enhancement. Pinout follows standard dual op amp configuration with independent input/output pairs for Channels A and B.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op amp applications.

Compared with AD8628ARZ and OPA2189IDR, the MAX44243AUD+T uniquely combines dual-channel operation, 36V supply support, guaranteed 5µV VOS, and monolithic EMI filtering - making it the only option qualified for unfiltered industrial analog I/O without external protection components.

Availability

MAX44243AUD+T is available at Aetrix Electronics and suitable for industrial PLC analog I/O modules, battery-powered precision instrumentation, and transducer signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX44243AUD+T 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

Maxim Integrated, now part of Analog Devices, designs high-performance analog and mixed-signal ICs for industrial, automotive, and communications applications.

The MAX44243AUD+T belongs to the MAX4424x zero-drift op amp family, engineered specifically for high-accuracy, low-noise signal conditioning in harsh electromagnetic environments - targeting applications where calibration-free operation and long-term stability are mandatory.

FAQ

What is the maximum operating temperature range for the MAX44243AUD+T?

The MAX44243AUD+T is rated for continuous operation from -40°C to +125°C ambient temperature, with junction temperature limited to +150°C. All electrical specifications - including input offset voltage, drift, PSRR, and CMRR - are guaranteed across this full industrial temperature range, making MAX44243AUD+T suitable for under-hood automotive and factory-floor applications where thermal stress is extreme.

Does the MAX44243AUD+T require external EMI filtering components?

No, the MAX44243AUD+T integrates a monolithic input EMI filter that provides >60dB rejection of RF interference up to 1GHz. This eliminates the need for external RC filters or ferrite beads in most industrial applications, reducing BOM count and PCB area while ensuring consistent performance across production units - a key advantage of MAX44243AUD+T over competing zero-drift op amps.

Can the MAX44243AUD+T drive an ADC input directly without additional buffering?

Yes, the MAX44243AUD+T's rail-to-rail output stage, 1µs settling time to 0.01%, and low output impedance (<1Ω typical) allow direct connection to high-resolution ADCs such as the MAX11211. Its 5µV max VOS and 9nV/√Hz noise preserve full dynamic range - confirmed in the Typical Operating Circuit where MAX44243AUD+T drives the MAX11211 without intermediate stages.

How does the chopper + auto-zero architecture of the MAX44243AUD+T differ from conventional zero-drift op amps?

The MAX44243AUD+T uses a hybrid architecture: chopper stabilization continuously suppresses 1/f noise, while periodic auto-zeroing corrects residual DC offset and drift. Unlike pure chopper or pure auto-zero designs, this dual-method approach avoids switching glitches and maintains wide bandwidth (5MHz GBW), enabling MAX44243AUD+T to serve both DC precision and AC signal integrity requirements simultaneously.

Is the MAX44243AUD+T pin-compatible with other devices in the MAX4424x family?

No - the MAX44243AUD+T (14-pin TSSOP, dual channel) is not pin-compatible with the MAX44241 (5-pin SOT23, single) or MAX44246 (8-pin SO, dual). Pinouts differ significantly: MAX44243AUD+T uses Pins 2/13 for VSS, Pins 3/4 and 6/7 for inputs, and Pins 9/10 for outputs, whereas MAX44246 places VDD on Pin 5 and shares different pin allocations. Board redesign is required when substituting between MAX4424x variants.