Analog Devices Inc./Maxim Integrated MAX4275AKEUA

Overview

MAX4275AKEUA from Maxim Integrated is a single-channel, rail-to-rail output, fixed-gain operational amplifier with internal V_CC/2 biasing at the noninverting input, optimized for single-supply AC-coupled signal conditioning. It delivers +5V/V noninverting gain with 0.1% gain accuracy, 23MHz gain-bandwidth product (at A_V = +25V/V to +101V/V), ±17V input fault protection, and consumes only 300µA from a +2.5V to +5.5V supply. It is widely used in portable instrumentation and smart-card readers where compact size and simplified biasing are critical.

For engineers reviewing the MAX4275AKEUA datasheet, MAX4275AKEUA pinout, MAX4275AKEUA application, or MAX4275AKEUA equivalent, key selection considerations include its factory-trimmed internal gain resistors, integrated V_CC/2 bias network eliminating external components, rail-to-rail output swing into 1kΩ, stability with up to 470pF capacitive loads, and ±17V input fault tolerance without phase reversal.

Technical Context

The MAX4275AKEUA integrates a decompensated rail-to-rail op-amp core with laser-trimmed on-chip feedback resistors (R_F/R_G) to achieve fixed noninverting gains - this specific variant is configured for +5V/V. Its internal 150kΩ/150kΩ resistor divider establishes a precise V_CC/2 bias at IN+, enabling full-swing AC-coupled operation from a single supply without external bias networks.

Input fault protection uses back-to-back SCR structures and diode clamps with current-limiting resistors (5kΩ at IN+, R_G at IN−), limiting input current to <3.5mA under ±17V overvoltage. The amplifier is stable driving 1kΩ loads and remains functional with capacitive loads ≤470pF without isolation resistors.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin ultra-small surface-mount package with exposed pad (thermal enhancement), footprint compatible with industry-standard SOT23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4175AKEUA and AD8275ARMZ, the MAX4275AKEUA uniquely combines high-speed +5V/V gain, integrated V_CC/2 bias, and ±17V fault tolerance in SOT23-5-making it optimal for portable, AC-coupled, medium-bandwidth signal chains where board space and component count are constrained.

Availability

MAX4275AKEUA is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, bar-code scanners, and infrared remote receivers requiring stable component supply, consistent gain accuracy, and rapid design implementation.

Supply support for MAX4275AKEUA 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 MAX4275AKEUA belongs to the GainAmp™ family of fixed-gain amplifiers, designed specifically to replace discrete op-amp + resistor gain blocks in space-constrained, low-power, single-supply systems requiring precision and reliability.

FAQ

What is the exact gain configuration of the MAX4275AKEUA?

The MAX4275AKEUA is factory-configured for a noninverting gain of +5V/V using laser-trimmed internal resistors. This value is confirmed in the Gain Selection Guide and Electrical Characteristics table of the official datasheet. The gain is fixed and cannot be altered externally. No external resistors are required to set or maintain this gain, and the 0.1% accuracy is guaranteed over temperature and unit-to-unit variation.

Does the MAX4275AKEUA require external biasing components for single-supply operation?

No, the MAX4275AKEUA does not require external biasing components for single-supply operation. It features an internal 150kΩ/150kΩ resistor divider that establishes a precise V_CC/2 bias at the IN+ pin. This allows AC-coupled input signals to be amplified with full rail-to-rail output swing without adding external resistors or capacitors-reducing BOM count and layout complexity.

What is the maximum capacitive load the MAX4275AKEUA can drive without instability?

The MAX4275AKEUA is specified to remain stable with capacitive loads up to 470pF when driving a 100kΩ load, as verified in the Capacitive Load Stability parameter (C_LOAD = 470pF). This eliminates the need for output isolation resistors in most signal-chain applications, including ADC input filtering and PCB trace routing. For loads exceeding 470pF, a series isolation resistor (e.g., 100Ω) is recommended.

Can the MAX4275AKEUA withstand input voltages beyond the supply rails?

Yes, the MAX4275AKEUA provides ±17V input fault protection on both IN+ and IN− pins relative to V_EE. This is achieved via back-to-back SCR structures and diode clamps with current-limiting resistors. Under ±17V overvoltage, input current remains below 3.5mA, preventing damage or output phase reversal-critical for robustness in noisy or uncontrolled signal environments.

What package type and thermal characteristics does the MAX4275AKEUA use?

The MAX4275AKEUA is housed in a 5-pin SOT23-5 package with an exposed thermal pad. Its absolute maximum junction temperature is +150°C, and it dissipates up to 571mW at +70°C ambient (derating 7.1mW/°C above). The package supports standard reflow profiles and offers low thermal resistance for reliable operation in compact, sealed enclosures.