Analog Devices Inc./Maxim Integrated MAX4274ADEUA+

Overview

MAX4274ADEUA+ 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 gains of +1.25V/V to +101V/V or inverting gains from –0.25V/V to –100V/V, operates from +2.5V to +5.5V, consumes only 300µA, and achieves up to 23MHz gain-bandwidth product at AV = +25V/V to +101V/V. It is used in low-side current-sense amplification and photodiode preamplification within portable instrumentation.

For engineers reviewing the MAX4274ADEUA+ datasheet, MAX4274ADEUA+ pinout, MAX4274ADEUA+ application, or MAX4274ADEUA+ equivalent, key selection criteria include guaranteed 0.1% gain accuracy (RF/RG), stability with 470pF capacitive loads, rail-to-rail output swing into 1kΩ, ±17V input fault tolerance, and SOT23-5 package compatibility for space-constrained designs.

Technical Context

The MAX4274ADEUA+ integrates a decompensated rail-to-rail op-amp core with laser-trimmed on-chip feedback resistors, enabling optimized bandwidth per gain setting - e.g., 230kHz –3dB bandwidth at AV = +100V/V. Its input stage includes back-to-back SCR structures and diode clamps with 5kΩ/RF current limiting, allowing ±17V fault voltage handling without phase reversal or excessive current draw.

Unlike open-loop counterparts (e.g., MAX4281), the MAX4274ADEUA+ is factory-compensated for fixed-gain operation and does not require external compensation. The inverting input (IN–) connects directly to the internal RG resistor, while the noninverting input (IN+) is unbuffered and externally referenced - distinguishing its input voltage range (VEE to VCC) from that of the MAX4275 variant with internal VCC/2 bias.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package (5-pin, 1.6mm × 2.9mm, 0.95mm height), thermally enhanced with exposed pad (not electrically connected). Pin 1 marked by dot; pin order: IN–, OUT, VEE, VCC, IN+.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4174EUK+T, the MAX4274ADEUA+ offers identical performance in a functionally equivalent package but with AD-grade traceability and qualification; versus AD8220BRMZ, it trades CMRR and supply range for lower power, smaller size, and superior fault resilience in single-ended, low-voltage sensing.

Availability

MAX4274ADEUA+ is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, and low-side current-sense applications requiring stable component supply, long-term lifecycle support, and guaranteed 0.1% gain accuracy across temperature.

Supply support for MAX4274ADEUA+ 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 industrial, medical, and communications systems.

The MAX4274ADEUA+ belongs to the GainAmp™ family - engineered to replace discrete op-amp + resistor gain stages with integrated, laser-trimmed precision in ultra-small SOT23 packages for space- and power-constrained signal chains.

FAQ

What is the operating temperature range for the MAX4274ADEUA+?

The MAX4274ADEUA+ is specified for operation from –40°C to +85°C. This industrial temperature range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official Maxim Integrated datasheet, and applies across all supply voltages (+2.5V to +5.5V) and gain configurations. The device maintains 0.1% gain accuracy and rail-to-rail output performance throughout this range.

Does the MAX4274ADEUA+ include internal VCC/2 biasing at the noninverting input?

No, the MAX4274ADEUA+ does not include internal VCC/2 biasing. That feature is exclusive to the MAX4275 series (e.g., MAX4275ADEUA+). The MAX4274ADEUA+ has an unbuffered, externally referenced IN+ pin - making it suitable for DC-coupled applications where precise common-mode control is required, unlike the AC-coupled, self-biased use case of the MAX4275.

Can the MAX4274ADEUA+ drive a 1000pF capacitive load stably?

The MAX4274ADEUA+ is guaranteed stable with capacitive loads up to 470pF without external compensation. Driving 1000pF requires an isolation resistor (typically 50Ω–100Ω) in series with the output, as shown in Figure 9 of the datasheet. Without it, overshoot or ringing may occur - though oscillation is avoided due to internal compensation design.

What is the maximum gain bandwidth product achievable with the MAX4274ADEUA+?

The MAX4274ADEUA+ achieves up to 23MHz gain-bandwidth product at noninverting gains of +25V/V to +101V/V. This value is measured under standard test conditions (VCC = +5V, TA = +25°C, RL = 100kΩ) and reflects strategic decompensation optimized per gain setting - significantly exceeding the 2MHz GBW of the open-loop MAX4281 counterpart at the same gain.

Is the MAX4274ADEUA+ pin-compatible with other GainAmp devices like the MAX4174?

Yes, the MAX4274ADEUA+ shares the same SOT23-5 pinout (IN–, OUT, VEE, VCC, IN+) and electrical interface as the MAX4174EUK+T and MAX4174 series. All are drop-in replacements for one another in board designs - differing only in temperature grade labeling, packaging format (tape/reel vs. cut tape), and minor qualification documentation, not functionality or pin mapping.