Analog Devices Inc./Maxim Integrated MAX4275AGEUA+

Overview

MAX4275AGEUA+ from Maxim Integrated is a single-channel, noninverting fixed-gain amplifier with internal V_CC/2 biasing, housed in a 5-pin SOT23 package. It delivers +5V/V gain with 0.1% accuracy, operates from +2.5V to +5.5V supply, consumes only 355µA (typ), and features rail-to-rail output swing driving 1kΩ while maintaining DC precision - ideal for single-supply signal conditioning in portable instrumentation and smart-card readers.

For engineers reviewing the MAX4275AGEUA+ datasheet, MAX4275AGEUA+ pinout, MAX4275AGEUA+ application, or MAX4275AGEUA+ equivalent, key selection criteria include its factory-trimmed gain accuracy, integrated mid-supply bias eliminating external resistors, ±17V input fault protection, 23MHz GBW product at high gains, and stability with up to 470pF capacitive loads without isolation resistors.

Technical Context

The MAX4275AGEUA+ integrates a rail-to-rail output op-amp core with laser-trimmed internal feedback resistors (RF/RG) and dual 150kΩ resistors forming a V_CC/2 bias network at the noninverting input. Its compensation is optimized specifically for +5V/V closed-loop gain, delivering 23MHz GBW and 330kHz –3dB bandwidth.

Input stage includes back-to-back SCR structures and diode clamps enabling ±17V fault tolerance at either input relative to VEE, with current limited to <3.5mA. The inverting input connects directly to RG, constraining its voltage range to within supply rails, while the biased noninverting input supports AC-coupled single-supply operation with full output swing.

Key Specifications

Pinout & Package

MAX4275AGEUA+ is packaged in a 5-pin SOT23 surface-mount package (JEDEC MO-178AA), footprint-compatible with standard SOT23 pick-and-place equipment and reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4175EUK+T, MAX4275AGEUA+ adds automotive-grade temperature range and enhanced reliability validation; compared with AD8236ARMZ-R7, it trades programmability and ultra-low bias for higher speed, lower cost, and zero-resistor integration - making it optimal for volume portable instrumentation where +5V/V is standardized.

Availability

MAX4275AGEUA+ is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, infrared remote receivers, and low-side current-sense amplifiers requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.

Supply support for MAX4275AGEUA+ 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 high-performance analog and mixed-signal ICs for power, interface, sensing, and timing applications, with emphasis on integration, reliability, and energy efficiency.

The MAX4275AGEUA+ belongs to the GainAmp™ family of fixed-gain amplifiers, engineered to replace discrete op-amp-plus-resistor configurations in space-constrained, low-power, single-supply systems - especially where precision, fault tolerance, and rapid time-to-market are critical.

FAQ

What is the operating temperature range for MAX4275AGEUA+?

The MAX4275AGEUA+ is rated for operation from -40°C to +125°C, meeting automotive-grade thermal requirements. This extended range is validated per AEC-Q100 stress testing protocols, distinguishing it from commercial variants like MAX4175EUK+T (-40°C to +85°C). The device maintains specified gain accuracy, input offset voltage drift (<±5µV/°C), and output swing performance across this full range.

Does MAX4275AGEUA+ require external biasing resistors for single-supply operation?

No. The MAX4275AGEUA+ integrates dual 150kΩ resistors that form an internal V_CC/2 bias network at the IN+ pin, eliminating the need for external resistors in AC-coupled single-supply applications. A 0.1µF bypass capacitor from IN+ to ground is recommended to suppress high-frequency power-supply noise coupling, as documented in Maxim's Typical Operating Circuit.

What is the maximum capacitive load the MAX4275AGEUA+ can drive without oscillation?

The MAX4275AGEUA+ is stable with capacitive loads up to 470pF when driving a 100kΩ load, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure 12). No isolation resistor is required within this limit. For loads exceeding 470pF, a series isolation resistor (e.g., 100Ω) at the output restores phase margin, as shown in Figure 9 of the datasheet.

How does the ±17V input fault protection work on MAX4275AGEUA+?

The MAX4275AGEUA+ employs back-to-back SCR structures at both IN+ and IN− pins, allowing either input to safely withstand ±17V relative to VEE without latch-up or excessive current draw. Input clamp diodes further protect the core op-amp, with current limited to <3.5mA by internal 5kΩ (IN+) and RG (IN−) resistors - ensuring robustness against ESD, hot-plug, or sensor overvoltage events.

Is MAX4275AGEUA+ pin-compatible with other GainAmp devices like MAX4174 or MAX4274?

Yes. The MAX4275AGEUA+ uses the standard 5-pin SOT23 pinout shared across the MAX4174/MAX4175/MAX4274/MAX4275 family: Pin 1 = IN−, Pin 2 = OUT, Pin 3 = VCC, Pin 4 = VEE, Pin 5 = IN+. This allows drop-in replacement in existing layouts designed for these parts, provided the internal V_CC/2 bias (present only in MAX4175/MAX4275) aligns with the application's coupling scheme.