Analog Devices Inc./Maxim Integrated MAX4126EUA-T

Overview

MAX4126EUA-T from Maxim Integrated is a dual, rail-to-rail input/output operational amplifier optimized for low-voltage, precision signal conditioning in battery-powered and portable systems. It delivers 5MHz gain-bandwidth, 650µA per amplifier quiescent current, ±200µV input offset voltage (max), and full rail-to-rail swing into 250Ω loads across +2.7V to +6.5V single supply. It is used in data-acquisition front-ends where low power, wide common-mode range, and high DC accuracy are critical.

For engineers reviewing the MAX4126EUA-T datasheet, MAX4126EUA-T pinout, MAX4126EUA-T application, or MAX4126EUA-T equivalent, this page provides verified electrical specifications, µMAX-8 package terminal mapping, dual-channel shutdown behavior, capacitive-load stability up to 500pF, and validated alternatives for low-power, single-supply op amp selection.

Technical Context

The MAX4126EUA-T implements a composite rail-to-rail input stage using parallel NPN and PNP differential pairs, enabling operation with common-mode voltage extending 250mV beyond VEE and VCC. Its output stage uses complementary push-pull circuitry to achieve <150mV saturation voltage at 250Ω load under full swing conditions.

This dual op amp features independent shutdown control per channel (SHDN1/SHDN2), reducing supply current to ≤25µA per amplifier when asserted. It is unity-gain stable, supports 500pF capacitive loads without external compensation, and exhibits no phase reversal during input overdrive - a key reliability feature in sensor interface circuits.

Key Specifications

Pinout & Package

MAX4126EUA-T is housed in an 8-pin µMAX package (pin-compatible with SO-8 but 30% smaller footprint). The package uses exposed pad thermal enhancement and is RoHS-compliant.

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 TLV2462IDR and AD8602ARMZ, MAX4126EUA-T uniquely combines dual independent shutdown, true rail-to-rail input *and* output, 5MHz bandwidth, and guaranteed 250Ω drive - making it optimal for space-constrained, battery-operated DAQ systems needing flexible power management and full signal-range utilization.

Availability

MAX4126EUA-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and data-acquisition systems requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term lifecycle assurance.

Supply support for MAX4126EUA-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 demanding industrial, automotive, and communications applications.

The MAX4122–MAX4129 family was engineered specifically for low-voltage, single-supply precision signal conditioning - emphasizing rail-to-rail operation, micropower efficiency, and robustness in portable and battery-critical systems.

FAQ

What is the operating supply voltage range for the MAX4126EUA-T?

The MAX4126EUA-T operates from a single supply of +2.7V to +6.5V or dual supplies of ±1.35V to ±3.25V. Its rail-to-rail input common-mode range extends 250mV beyond both supply rails, allowing signal acquisition even when inputs fall slightly below VEE or above VCC. This makes MAX4126EUA-T especially suitable for low-voltage systems where headroom is constrained.

Does the MAX4126EUA-T support shutdown mode, and how does it behave?

Yes, MAX4126EUA-T includes two independent shutdown pins (SHDN1 and SHDN2), one per amplifier. When pulled low (<0.8V), each channel reduces its supply current to ≤25µA and places its output in a high-impedance state. The pins can be left floating or tied high (>2V) to enable operation. This per-channel control enables selective power gating in multi-sensor systems - a feature not found in many competing dual op amps like the TLV2462IDR.

Can the MAX4126EUA-T drive heavy capacitive loads, and what is the limit?

Yes, MAX4126EUA-T is explicitly characterized for stability with capacitive loads up to 500pF without external compensation. This is confirmed in the datasheet's "Capacitive Load Stability" graph (Figure 4) and transient response plots (Figures 5–8). Driving such loads is essential in anti-aliasing filter design and cable interfacing - and MAX4126EUA-T avoids the need for series isolation resistors that degrade signal fidelity.

What is the input offset voltage specification for MAX4126EUA-T over temperature?

The MAX4126EUA-T guarantees a maximum input offset voltage of ±4.7mV over the full industrial temperature range (–40°C to +85°C), with a typical value of ±200µV at +25°C. Its offset voltage temperature coefficient is ±2µV/°C, ensuring predictable drift behavior. These specs are verified in the "DC ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet - critical for maintaining accuracy in precision gain stages where offset contributes directly to measurement error.

Is the MAX4126EUA-T pin-compatible with other packages in the MAX412x family?

MAX4126EUA-T uses the 8-pin µMAX package, which shares the same pinout as MAX4126ESA (SO-8) and MAX4126EUA variants - all follow the standard dual-op-amp configuration: OUT1, IN1−, IN1+, VEE, VCC, IN2+, IN2−, OUT2. However, it is *not* pin-compatible with SOT23-5 variants (e.g., MAX4122EUK) or quad versions (e.g., MAX4129ESD). Always verify package drawings - µMAX and SO-8 have identical pin functions but differ in footprint and thermal pad layout.