Analog Devices Inc./Maxim Integrated MAX4275BEESA

Overview

MAX4275BEESA 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 and factory-trimmed precision gain-setting resistors. It delivers +5V/V noninverting gain with 0.1% accuracy, operates from +2.5V to +5.5V single supply, consumes only 300µA, and features ±17V input fault protection - ideal for low-power, single-supply signal conditioning in portable instrumentation and smart-card readers.

For engineers reviewing the MAX4275BEESA datasheet, MAX4275BEESA pinout, MAX4275BEESA application, or MAX4275BEESA equivalent, key selection criteria include its integrated V_CC/2 bias (eliminating external resistors), guaranteed 0.1% gain accuracy across temperature, 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 MAX4275BEESA integrates a decompensated rail-to-rail op-amp core with laser-trimmed thin-film resistors forming a fixed noninverting gain network (RF/RG = 4). Its compensation is optimized specifically for +5V/V gain, delivering 23MHz GBW and 330kHz –3dB bandwidth while maintaining stability without external components.

Input stage protection includes back-to-back SCR structures and diode clamps on both IN+ and IN− pins, limiting fault current to <3.5mA at ±17V overvoltage. The internal 150kΩ/150kΩ resistor divider establishes V_CC/2 at IN+, enabling AC-coupled single-supply operation with maximum dynamic range and no external bias network.

Key Specifications

Pinout & Package

MAX4275BEESA is housed in a 5-pin SOT23 package (JEDEC MO-178AA), with exposed pad for thermal enhancement and standard footprint compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4175BEESA, the MAX4275BEESA provides higher gain (+5V/V vs. +3V/V) and slightly lower bandwidth, while versus MAX4274BEESA it eliminates external bias components - reducing component count and improving reliability in space-constrained portable systems.

Availability

MAX4275BEESA is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, and low-side current-sense applications requiring stable component supply, guaranteed 0.1% gain accuracy, and single-supply rail-to-rail performance.

Supply support for MAX4275BEESA 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 design and manufacturing company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX4275BEESA belongs to the GainAmp™ fixed-gain amplifier product line, engineered to replace discrete op-amp + resistor networks with monolithic, laser-trimmed solutions that reduce size, cost, and design risk in precision signal-conditioning circuits.

FAQ

What is the exact gain configuration and accuracy of the MAX4275BEESA?

The MAX4275BEESA is configured for noninverting +5V/V gain using internal laser-trimmed resistors with a guaranteed ±0.1% accuracy over the –40°C to +85°C operating temperature range. This specification is validated per Maxim's production test flow and does not require user calibration. The MAX4275BEESA achieves this accuracy without external components, making it suitable for precision gain stages in medical and test equipment where repeatability is critical.

Does the MAX4275BEESA require external biasing resistors for single-supply operation?

No, the MAX4275BEESA includes an internal 150kΩ/150kΩ resistor divider that biases the IN+ pin to V_CC/2, eliminating the need for external bias resistors in AC-coupled single-supply applications. This feature reduces component count, PCB area, and potential leakage errors. For DC-coupled operation, users must ensure the input signal remains within the specified common-mode range (VEE to VCC).

What is the maximum capacitive load the MAX4275BEESA can drive without instability?

The MAX4275BEESA is stable with capacitive loads up to 470pF directly connected to the output pin, as verified in Maxim's characterization data. This eliminates the need for series isolation resistors in most sensor interface and cable-driving applications. For loads exceeding 470pF, a small series resistor (e.g., 10–100Ω) between OUT and the load restores phase margin without degrading DC accuracy.

How does the ±17V input fault protection work on the MAX4275BEESA?

The MAX4275BEESA incorporates back-to-back SCR structures and diode clamps on both IN+ and IN− pins. When either input exceeds VEE or VCC by more than ~0.7V, the clamps conduct and limit fault current to under 3.5mA. This prevents latch-up, phase reversal, or permanent damage during ESD events or wiring faults - a key reliability feature for field-deployed instrumentation using the MAX4275BEESA.

What package type and pin compatibility does the MAX4275BEESA offer?

The MAX4275BEESA uses a 5-pin SOT23-5 package (JEDEC MO-178AA) with standard pinout: Pin 1 = IN−, Pin 2 = IN+, Pin 3 = VEE, Pin 4 = VCC, Pin 5 = OUT. It shares footprint and pin compatibility with other GainAmp devices in the MAX4174/4175/4274/4275 family, enabling drop-in replacement across gain variants without PCB redesign.