Analog Devices Inc./Maxim Integrated MAX40242ANA+T

Overview

The MAX40242ANA+T from Maxim Integrated is a dual, rail-to-rail output operational amplifier optimized for high-impedance sensor interfacing, featuring 2pA max input bias current, 5nV/√Hz input voltage noise, and 10MHz gain-bandwidth product. It operates from a single 2.7V to 20V supply or split ±1.35V to ±10V supplies and is rated for automotive-grade operation from –40°C to +125°C in an ultra-small 0.85mm × 1.65mm 8-bump WLP package.

For engineers reviewing the MAX40242ANA+T datasheet, MAX40242ANA+T pinout, MAX40242ANA+T application, or MAX40242ANA+T equivalent, this device is selected for precision transimpedance amplification, low-leakage medical pulse oximetry front-ends, and industrial chemical sensor signal conditioning where sub-picoampere bias current and EMI robustness are critical.

Technical Context

The MAX40242ANA+T employs a high-impedance CMOS input stage with integrated EMI filtering, enabling stable operation in noisy environments without external RF suppression components. Its unity-gain stability and 8V/µs slew rate support fast settling (2µs to 0.1%) into capacitive loads up to 200pF without isolation resistors.

Designed for ground-referenced sensor interfaces, it delivers rail-to-rail output swing while maintaining low input offset voltage drift (0.25µV/°C typ) and high common-mode rejection (90dB min over temperature), making it suitable for DC-critical photodiode and pH sensor applications requiring minimal dark-current error and thermal drift.

Key Specifications

Pinout & Package

MAX40242ANA+T uses an 8-bump wafer-level package (WLP) measuring 0.85mm × 1.65mm with 0.4mm pitch. The package is RoHS-compliant and designed for automated reflow assembly on fine-pitch PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual, low-input-bias-current op amp applications.

Compared with ADA4530-1ARZ and LTC6268IMS8#PBF, the MAX40242ANA+T uniquely balances ultra-low bias current (2pA), 10MHz bandwidth, integrated EMI filtering, and automotive temperature rating in a 0.85mm × 1.65mm WLP-making it optimal for space-constrained, noise-immune, high-reliability sensor front-ends.

Availability

MAX40242ANA+T is available at Aetrix Electronics and suitable for chemical sensor interface, photodiode signal conditioning, medical pulse oximetry, industrial process control, and precision instrumentation requiring stable component supply across automotive and industrial temperature ranges.

Supply support for MAX40242ANA+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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.

The MAX40242ANA+T belongs to Maxim's high-precision, low-noise op amp product line-engineered specifically for sensor signal chains where input leakage, EMI susceptibility, and thermal drift directly impact measurement fidelity.

FAQ

What is the maximum capacitive load the MAX40242ANA+T can drive without external compensation?

The MAX40242ANA+T drives up to 200pF capacitive load without oscillation or external isolation resistors, verified across its full –40°C to +125°C operating range. This capability simplifies ADC interface design and eliminates layout-sensitive compensation networks typically required for photodiode transimpedance stages. The MAX40242ANA+T achieves this through internal phase-margin optimization and unity-gain stability architecture.

Does the MAX40242ANA+T support single-supply operation with rail-to-rail input?

No-the MAX40242ANA+T features rail-to-rail *output* swing but does not support rail-to-rail *input* common-mode range. Its input common-mode range extends from VSS – 0.05V to VDD – 1.5V, meaning it cannot accept signals within 1.5V of the positive rail. For true rail-to-rail input operation, consider alternative amplifiers like the MAX44267. The MAX40242ANA+T remains ideal for sensor buffering where inputs are biased mid-supply.

How does the integrated EMI filter in the MAX40242ANA+T improve system-level robustness?

The MAX40242ANA+T integrates passive on-die RC filters on both inputs, providing ≥35dB rejection from 400MHz to 2.4GHz. This suppresses RF rectification effects that cause output DC shifts or erratic behavior in portable medical devices near cellular/WiFi sources. Unlike external filters, the integrated solution avoids parasitic inductance and maintains signal integrity without degrading bandwidth-critical for the MAX40242ANA+T's 10MHz GBW performance.

Is the MAX40242ANA+T pin-compatible with other devices in the MAX402xx family?

Yes-the MAX40242ANA+T shares identical 8-bump WLP pinout and footprint with MAX40241 (single-channel) and MAX40243 (quad-channel) variants. This enables scalable design reuse: a single PCB land pattern supports single/dual/quad configurations, reducing layout iterations and inventory complexity. All three share identical electrical specifications except channel count and quiescent current scaling.

What is the typical input offset voltage drift of the MAX40242ANA+T over temperature?

The MAX40242ANA+T exhibits a typical input offset voltage drift of 0.25µV/°C, with a guaranteed maximum of 2.5µV/°C over –40°C to +125°C. This ultra-low drift minimizes calibration burden in field-deployed instruments-such as environmental gas sensors-where thermal cycling would otherwise induce significant measurement drift. The MAX40242ANA+T achieves this via laser-trimmed input-stage matching and BiCMOS process optimization.