Analog Devices Inc./Maxim Integrated MAX4274ADEUA+T

Overview

The MAX4274ADEUA+T from Maxim Integrated is a single-channel, fixed-gain, rail-to-rail output operational amplifier in SOT23-5 package, featuring factory-trimmed internal resistors for 0.1% gain accuracy, ±17V input fault protection, and operation from +2.5V to +5.5V supply with only 300µA quiescent current. It delivers noninverting gains up to +101V/V and supports low-side current-sense and photodiode preamplifier applications.

For engineers reviewing the MAX4274ADEUA+T datasheet, MAX4274ADEUA+T pinout, MAX4274ADEUA+T application, or MAX4274ADEUA+T equivalent, key selection criteria include confirmed gain accuracy (±0.1%), rail-to-rail output swing into 1kΩ, GBW up to 23MHz at AV = +25V/V to +101V/V, fault-tolerant inputs, and SOT23-5 footprint compatibility with existing GainAmp designs.

Technical Context

The MAX4274ADEUA+T integrates a precision rail-to-rail op amp core with laser-trimmed on-chip feedback resistors (RF/RG), eliminating external components and ensuring 0.1% gain accuracy across temperature. Its internal compensation is optimized per gain version, enabling up to 23MHz GBW product for high closed-loop gains (+25V/V to +101V/V).

Input protection includes back-to-back SCR structures and diode clamps at both IN+ and IN− pins, allowing ±17V fault voltage tolerance without phase reversal or excessive current draw (<3.5mA). The device is stable driving capacitive loads up to 470pF without isolation resistors.

Key Specifications

Pinout & Package

SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with exposed pad for thermal performance; compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4174EUK+T, MAX4274ADEUA+T provides identical electrical behavior and qualification; compared with AD8220ARMZ, it trades programmability and CMRR for lower power, smaller size, built-in fault protection, and guaranteed 0.1% gain accuracy without external components.

Availability

MAX4274ADEUA+T is available at Aetrix Electronics and suitable for low-side current-sense, photodiode preamplification, and portable instrument signal conditioning requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX4274ADEUA+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, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.

The MAX4274ADEUA+T belongs to the GainAmp™ fixed-gain amplifier product line, engineered to replace discrete op-amp + resistor gain blocks with integrated, laser-trimmed solutions for space-constrained, high-accuracy, low-power signal conditioning.

FAQ

What is the guaranteed gain accuracy of the MAX4274ADEUA+T over temperature?

The MAX4274ADEUA+T guarantees ±0.1% gain accuracy across its full operating temperature range of −40°C to +85°C. This specification is achieved through factory laser trimming of internal RF/RG resistors and is validated per Maxim's production test flow, not derived from extrapolation or typical-only data. The MAX4274ADEUA+T maintains this accuracy without external calibration or trimming components.

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

No, the MAX4274ADEUA+T does not include internal V_CC/2 biasing. That feature is exclusive to the MAX4275 variant (e.g., MAX4275ADEUA+T). The MAX4274ADEUA+T has an uncommitted IN+ pin, requiring external biasing for single-supply AC-coupled applications. This distinction is clearly defined in Maxim's GainAmp family documentation and pin-function tables.

What is the maximum capacitive load the MAX4274ADEUA+T can drive without oscillation?

The MAX4274ADEUA+T is specified stable with capacitive loads up to 470pF when driving a 100kΩ load, per Maxim's Electrical Characteristics table and Typical Operating Characteristics (TOC11–TOC12). No isolation resistor is required within this limit. Driving >470pF may cause peaking or instability unless a series isolation resistor (e.g., 100Ω) is added at the output, as documented in Figure 9 of the datasheet.

Can the MAX4274ADEUA+T be used in dual-supply configurations?

Yes, the MAX4274ADEUA+T supports dual-supply operation from ±1.25V to ±2.75V (i.e., total supply ≤5.5V), as stated in the Applications Information section. In dual-supply mode, VEE is connected to the negative rail (e.g., −1.25V), enabling true bipolar signal handling. All key specs-including input common-mode range, output swing, and gain accuracy-apply under dual-supply conditions.

What is the input protection architecture of the MAX4274ADEUA+T?

The MAX4274ADEUA+T employs dual-layer input protection: (1) back-to-back SCR structures rated for ±17V fault voltage at IN+ and IN−, and (2) diode clamps to VCC and VEE with current-limiting resistors (5kΩ at IN+, RG at IN−). This design limits fault current to <3.5mA and prevents phase reversal or latch-up, as verified in Absolute Maximum Ratings and Applications Information sections of the datasheet.