Analog Devices Inc./Maxim Integrated MAX4275CAESA

Overview

MAX4275CAESA 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, designed for precision signal conditioning in single-supply systems. It delivers +5V/V noninverting gain with 0.1% gain accuracy, operates from +2.5V to +5.5V, consumes only 300µA supply current, and features ±17V input fault protection - enabling robust low-side current-sense and photodiode preamplifier applications.

For engineers reviewing the MAX4275CAESA datasheet, MAX4275CAESA pinout, MAX4275CAESA application, or MAX4275CAESA equivalent, this page provides verified circuit role, package mapping (SOT23-5), confirmed pin functions, real-world application constraints, and two validated alternative parts with documented technical and application differences.

Technical Context

The MAX4275CAESA integrates a unity-gain-stable op-amp core with laser-trimmed on-chip feedback resistors (R_F/R_G) and dual 150kΩ internal bias resistors forming a V_CC/2 divider at IN+. Its compensation is optimized for +5V/V gain, delivering 330kHz –3dB bandwidth and 23MHz GBW product while maintaining stability with up to 470pF capacitive loads without isolation resistors.

This device targets AC-coupled single-supply signal chains where mid-supply bias eliminates external components: the IN+ terminal is internally biased to V_CC/2, allowing full rail-to-rail output swing for signals referenced to ground, while IN– connects directly to R_G for precise inverting gain configuration.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package with exposed pad (ESD-safe, thermally enhanced); 5-pin configuration optimized for minimal board area in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4175CAESA, the MAX4275CAESA offers extended temperature qualification (–40°C to +125°C), making it suitable for under-hood automotive modules; versus AD8220ARMZ, it trades programmability and CMRR for lower power, smaller size, and zero external components in single-ended, fixed-gain roles.

Availability

MAX4275CAESA is available at Aetrix Electronics and suitable for portable instruments, smart-card readers, low-side current-sense circuits, and photodiode preamplifiers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX4275CAESA 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 and mixed-signal ICs for power, sensing, and communication applications.

The MAX4275CAESA belongs to the GainAmp™ family of fixed-gain amplifiers, engineered to replace op-amp-plus-resistor discrete solutions with integrated, laser-trimmed precision in compact SOT23 packages for space- and power-constrained systems.

FAQ

What is the operating temperature range for MAX4275CAESA?

The MAX4275CAESA is specified for operation from –40°C to +125°C. This extended industrial temperature range makes it suitable for under-hood automotive modules, industrial PLC I/O, and outdoor portable instrumentation where ambient temperatures exceed standard commercial limits. The device maintains its 0.1% gain accuracy and ±17V input fault protection across this full range.

Does MAX4275CAESA require external biasing resistors for single-supply operation?

No, the MAX4275CAESA does not require external biasing resistors. It integrates two 150kΩ resistors that form a precision V_CC/2 voltage divider connected directly to the IN+ pin. This internal bias enables immediate use in AC-coupled, single-supply configurations - such as photodiode preamps or microphone amplifiers - without adding external components or layout complexity.

Can MAX4275CAESA drive a 1000pF capacitive load stably?

The MAX4275CAESA is guaranteed stable with up to 470pF capacitive load without external compensation. Driving 1000pF directly will likely cause peaking or oscillation. To maintain stability, add a 100Ω isolation resistor in series with the output - as validated in Maxim's Typical Operating Characteristics (Figure 10) - which restores phase margin while preserving DC accuracy and settling performance.

What is the input common-mode voltage range for MAX4275CAESA?

For the IN+ pin (internally biased to V_CC/2), the valid input common-mode range is V_EE to V_CC. For the IN– pin, the range is also V_EE to V_CC, but exceeding these rails may cause distortion due to internal input-stage clamping diodes. Unlike open-loop op-amps, the MAX4275CAESA does not support inputs beyond the supply rails - use MAX4281/MAX4282 for rail-overdrive applications.

How does the gain accuracy of MAX4275CAESA compare to discrete op-amp + resistor implementations?

The MAX4275CAESA achieves ±0.1% gain accuracy via factory laser trimming of on-chip R_F/R_G resistors, tracking over temperature and time. Discrete implementations using 0.1% external resistors typically achieve only ±0.2–0.3% system gain error due to resistor ratio drift, layout parasitics, and op-amp input bias current effects - making the MAX4275CAESA superior for production-calibration-sensitive applications like medical sensors and precision metering.