Analog Devices Inc./Maxim Integrated MAX9912EUA+T

Overview

The MAX9912EUA+T from Maxim Integrated is a dual, rail-to-rail input/output operational amplifier optimized for ultra-low-power, precision signal conditioning in battery-powered systems. It delivers 200kHz gain-bandwidth, 4µA typical supply current per amplifier, 1pA input bias current, and operates from a single 1.8V to 5.5V supply - enabling high-accuracy sensor front-ends in portable medical devices and data-acquisition equipment.

For engineers reviewing the MAX9912EUA+T datasheet, MAX9912EUA+T pinout, MAX9912EUA+T application, or MAX9912EUA+T equivalent, this page provides verified electrical parameters, dual-channel pin mapping, temperature-stable offset performance (±5mV over –40°C to +85°C), shutdown-free operation, and real-world use cases in glucose meters and portable test instrumentation.

Technical Context

The MAX9912EUA+T implements a CMOS input stage with parallel n- and p-channel transistors to achieve rail-to-rail common-mode input range (VSS – 0.05V to VDD + 0.05V) and output swing within 90mV of both rails at 5kΩ load. Its unity-gain stability supports direct use in buffer and gain-of-1 configurations without external compensation.

It features matched input offset voltage (±250µV max between channels), 80dB minimum open-loop gain at –40°C to +85°C, and 60dB common-mode rejection across temperature - confirming suitability for differential sensing where channel-to-channel tracking matters, such as dual-sensor monitoring or multi-electrode biosignal acquisition.

Key Specifications

Pinout & Package

The MAX9912EUA+T is housed in an 8-pin SOT23 package (package code K8+5), RoHS-compliant, with 1.6mm × 2.9mm footprint and 0.95mm height - compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual, rail-to-rail, low-power op amp applications.

Compared with MAX4477AUA+ and OPA2333AIDR, the MAX9912EUA+T uniquely balances sub-µA quiescent current, dual-channel matching, and rail-to-rail operation in a space-constrained SOT23 - making it irreplaceable in ultra-low-power, size-sensitive portable medical designs where every nanoamp and square millimeter counts.

Availability

The MAX9912EUA+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, and wearable biosensor hubs requiring stable component supply across extended product lifecycles.

Supply support for MAX9912EUA+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 and mixed-signal ICs for demanding industrial, medical, and communications applications - emphasizing low power, high accuracy, and robustness.

The MAX9910–MAX9913 family was engineered specifically for battery-operated instrumentation requiring rail-to-rail I/O, ultra-low input bias, and minimal supply current - targeting glucose meters, handheld test gear, and portable patient monitors.

FAQ

Does the MAX9912EUA+T support shutdown mode?

No, the MAX9912EUA+T does not include a shutdown function. Unlike the MAX9911/MAX9913 variants, it lacks SHDN pins and draws 7µA per amplifier continuously. For shutdown capability, consider the MAX9913EUB+ - but note its 10-pin µMAX package and non-pin-compatible layout. The MAX9912EUA+T is optimized for simplicity and lowest possible active current without control logic overhead.

What is the maximum capacitive load the MAX9912EUA+T can drive stably?

The MAX9912EUA+T is unity-gain stable with capacitive loads up to 30pF. When configured for gain ≥10V/V, it supports loads up to 250pF. For loads between 30pF and 250pF in unity-gain applications, an isolation resistor (RISO) is required - e.g., 6.2kΩ for 100pF - as documented in Figure 2 of the MAX9910–MAX9913 datasheet. Exceeding these limits risks oscillation or overshoot.

Can the MAX9912EUA+T operate from a 1.8V supply while maintaining rail-to-rail output swing?

Yes, the MAX9912EUA+T fully supports 1.8V operation with rail-to-rail input and output. At VDD = 1.8V and TA = +25°C, output swing is within 5mV of both rails under 100kΩ load, and within 90mV under 5kΩ load. This is confirmed in the Electrical Characteristics table (VOL/VOH specs at VDD = 1.8V) and Typical Operating Characteristics (toc11/toc12 graphs), ensuring full dynamic range utilization in low-voltage portable systems.

How does input offset voltage drift with temperature for the MAX9912EUA+T?

The MAX9912EUA+T has a guaranteed input offset voltage drift of ±5µV/°C maximum over –40°C to +85°C. This is specified in the "Electrical Characteristics" table under "Input-Offset-Voltage Temperature Coefficient". At +85°C, the total offset remains within ±5mV (the full-range max spec), meaning drift contributes ≤0.5mV additional error across a 100°C span - critical for uncalibrated DC measurements in field-deployed medical devices.

Is the MAX9912EUA+T pin-compatible with other devices in the MAX9910–MAX9913 family?

No, the MAX9912EUA+T is not pin-compatible with other family members. It uses an 8-pin SOT23 package (pins: OUTA, INA−, INA+, VSS, VDD, INB+, INB−, OUTB), whereas MAX9910 is 5-pin SC70, MAX9911 is 6-pin SC70 or WLP, and MAX9913 is 10-pin µMAX. Pin functions differ significantly - e.g., MAX9912EUA+T has no shutdown pins, while MAX9913 dedicates two pins (SHDNA/SHDNB) for independent channel control.