Analog Devices Inc./Maxim Integrated MAX4274BAEUA

Overview

MAX4274BAEUA from Maxim Integrated is a single-channel, fixed-gain, rail-to-rail output operational amplifier with internal precision gain-setting resistors and ±17V input fault protection. It delivers noninverting gain of +5V/V, operates from +2.5V to +5.5V single supply, consumes 355µA typical supply current, and achieves 330kHz −3dB bandwidth. It is used in low-side current-sense amplification and photodiode preamplifier circuits requiring high DC accuracy and robust input tolerance.

For engineers reviewing the MAX4274BAEUA datasheet, MAX4274BAEUA pinout, MAX4274BAEUA application, or MAX4274BAEUA equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SOT23-5 pin mapping, application-specific value statements, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The MAX4274BAEUA integrates a decompen­sated rail-to-rail op-amp core with laser-trimmed on-chip feedback resistors (RF/RG) to deliver factory-set +5V/V noninverting gain with 0.1% accuracy. Its compensation is optimized specifically for AV = +5V/V, enabling 330kHz −3dB bandwidth and 23MHz GBW product - significantly higher than unity-gain-stable op-amps at same gain.

Input stage includes back-to-back SCR structures and diode clamps, allowing ±17V fault voltage tolerance at IN−/IN+ without phase reversal or excessive current draw (<3.5mA). The inverting input connects directly to RG, limiting its common-mode range to within supply rails, while the noninverting input accepts VCC/2 biasing only in MAX4275 variants - not applicable to MAX4274BAEUA.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package with exposed pad (thermal enhancement), 5-pin configuration, footprint compatible with JEDEC MO-178AB standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-gain amplifier applications.

Compared with MAX4174BEUK+T, MAX4274BAEUA offers identical electrical performance with enhanced production traceability; versus AD8220BRMZ, it trades programmable gain and CMRR for lower power, smaller size, built-in fault protection, and zero external components - making it optimal for cost- and space-sensitive current-sense and photodiode applications.

Availability

MAX4274BAEUA is available at Aetrix Electronics and suitable for low-power portable instruments, smart-card readers, and photodiode preamplifiers requiring stable component supply, guaranteed 0.1% gain accuracy, and long-term obsolescence management.

Supply support for MAX4274BAEUA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX4274BAEUA belongs to the GainAmp™ family of fixed-gain amplifiers, designed to replace discrete op-amp-plus-resistor configurations with integrated, laser-trimmed precision gain blocks for space-constrained, low-power sensing systems.

FAQ

What is the exact gain configuration and tolerance of the MAX4274BAEUA?

The MAX4274BAEUA is a noninverting fixed-gain amplifier with precisely trimmed +5V/V gain. Its gain accuracy is ±0.1% over temperature (−40°C to +85°C), achieved via factory laser trimming of internal RF/RG resistors - no external components or calibration required. This specification is guaranteed per the MAX4274 datasheet Electrical Characteristics table under "DC Gain Accuracy".

Does the MAX4274BAEUA include internal VCC/2 biasing at the noninverting input?

No, the MAX4274BAEUA does not include internal VCC/2 biasing. That feature is exclusive to the MAX4275 series (e.g., MAX4275BAEUA). The MAX4274BAEUA's IN+ pin is a direct op-amp input node requiring external DC bias for AC-coupled single-supply operation - confirmed in the Pin Description table and Applications Information section of the datasheet.

What is the maximum capacitive load the MAX4274BAEUA can drive without instability?

The MAX4274BAEUA remains stable with capacitive loads up to 470pF without requiring an isolation resistor - verified in the Electrical Characteristics table under "Capacitive Load Stability". Driving >470pF (e.g., long cables or large ADC input capacitance) requires adding a series isolation resistor (typically 50–100Ω) between OUT and the load to maintain phase margin.

Can the MAX4274BAEUA be used in dual-supply configurations?

Yes, the MAX4274BAEUA supports dual-supply operation from ±1.25V to ±2.75V (equivalent to total supply of 2.5V to 5.5V), as stated in the Supply Voltage Range specification. In dual-supply mode, VEE is connected to the negative rail (e.g., −2.5V), VCC to the positive rail (e.g., +2.5V), and signals referenced to ground - enabling true bipolar input/output swing.

What is the input common-mode voltage range for the MAX4274BAEUA?

The inverting input (IN−) of the MAX4274BAEUA must remain within the supply rails (VEE to VCC) to avoid distortion, as it connects directly to the internal RG resistor. The noninverting input (IN+) accepts the full rail-to-rail common-mode range (VEE to VCC), per the datasheet's "IN_− Input Voltage Range" and "IN_+ Input Voltage Range" specifications - critical for proper biasing in single-supply designs.