Analog Devices Inc./Maxim Integrated MAX4274ABESA

Overview

MAX4274ABESA from Maxim Integrated is a single-channel, noninverting fixed-gain amplifier with internal precision resistors, delivering +5V/V gain accuracy of ±0.1%, rail-to-rail output swing, and operation from +2.5V to +5.5V single supply. It consumes only 300µA quiescent current and features ±17V input fault protection - ideal for low-power portable instrumentation and smart-card reader front-ends.

For engineers reviewing the MAX4274ABESA datasheet, MAX4274ABESA pinout, MAX4274ABESA application, or MAX4274ABESA equivalent, key selection criteria include guaranteed DC gain accuracy, capacitive-load stability up to 470pF, GBW optimization at +5V/V, and SOT23-5 package compatibility in space-constrained single-supply signal conditioning designs.

Technical Context

The MAX4274ABESA integrates a rail-to-rail output op-amp core with laser-trimmed on-chip feedback resistors (RF/RG) to fix noninverting gain at +5V/V. Its internal compensation is optimized specifically for this gain setting, achieving 330kHz −3dB bandwidth and 23MHz GBW product while maintaining stability with 470pF capacitive loads without external isolation.

Input structure includes back-to-back SCR-based ±17V fault protection on both IN+ and IN− pins, with diode clamping and series current-limiting resistors (5kΩ on IN+, RG on IN−). The noninverting input is not internally biased to VCC/2 - that feature applies only to MAX4275 variants.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package (2.9mm × 1.6mm × 1.1mm), thermally enhanced with exposed pad (not electrically connected), rated for −40°C to +85°C industrial operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4174AEUK-T, the MAX4274ABESA trades tighter DC specs for broader availability and standard industrial qualification; versus MAX4274AESA+, it offers identical electrical performance at lower cost and shorter lead time for non-automotive volume production.

Availability

MAX4274ABESA is available at Aetrix Electronics and suitable for portable instruments, smart-card readers, infrared receivers, and low-side current-sense applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for MAX4274ABESA 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 power, sensing, interface, and timing applications in industrial, medical, and communications systems.

The MAX4274ABESA belongs to the GainAmp™ fixed-gain amplifier family, engineered to replace discrete op-amp + resistor networks with integrated, laser-trimmed gain blocks for reduced size, cost, and design risk in signal-conditioning circuits.

FAQ

What is the exact gain configuration and polarity of the MAX4274ABESA?

The MAX4274ABESA is a noninverting fixed-gain amplifier with precisely trimmed +5V/V gain. Its internal resistor network connects IN− to RG and RF, forming a closed-loop noninverting topology. Unlike the MAX4275 series, it does not include internal VCC/2 biasing at IN+, so external DC biasing is required for AC-coupled single-supply operation. This configuration is confirmed in the Functional Diagrams and Pin Description sections of the official MAX4274 datasheet.

Does the MAX4274ABESA support dual-supply operation?

Yes, the MAX4274ABESA operates from ±1.25V to ±2.75V dual supplies, as explicitly stated in the Supply Bypassing and Board Layout section of its datasheet. When used 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 both rails require individual 0.1µF bypass capacitors. Input common-mode range extends from VEE − 0.15V to VCC − 1.2V, supporting ground-referenced signal coupling.

What is the maximum capacitive load the MAX4274ABESA can drive without oscillation?

The MAX4274ABESA is guaranteed stable with capacitive loads up to 470pF without any external isolation resistor, per the Capacitive-Load Stability specification (TYP value) and Typical Operating Characteristics (Figure 12). This capability is enabled by gain-specific decompensation and has been validated across temperature and supply voltage ranges. Loads exceeding 470pF require a series isolation resistor (e.g., 100Ω) between OUT and CL to maintain phase margin.

How does the ±17V input fault protection work on the MAX4274ABESA?

The MAX4274ABESA implements ±17V input fault protection using back-to-back SCR structures at both IN+ and IN− pins, combined with diode clamps to VCC and VEE. Current is limited by a 5kΩ resistor on IN+ and the internal RG resistor on IN−, ensuring input current remains below 3.5mA even at ±17V overvoltage. This architecture prevents latch-up and protects both the amplifier and upstream signal sources - a feature verified in Absolute Maximum Ratings and Applications Information sections.

Is the MAX4274ABESA pin-compatible with other GainAmp devices like MAX4174 or MAX4275?

Yes, the MAX4274ABESA shares the identical SOT23-5 pinout (IN−, OUT, VCC, VEE, IN+) with MAX4174, MAX4175, MAX4274, and MAX4275 variants. However, functional differences exist: MAX4274ABESA and MAX4174 are non-biased +5V/V amplifiers, while MAX4175/MAX4275 integrate VCC/2 biasing at IN+. Thus, direct substitution is electrically valid only when external biasing matches the target device's IN+ configuration - no PCB changes are needed, but circuit behavior differs if biasing is unmodified.