Analog Devices Inc./Maxim Integrated MAX4275BKESA

Overview

MAX4275BKESA 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% gain accuracy, operates from +2.5V to +5.5V single supply, consumes only 300µA, and withstands ±17V input fault voltage-ideal for low-side current-sense amplification in portable instrumentation.

For engineers reviewing the MAX4275BKESA datasheet, MAX4275BKESA pinout, MAX4275BKESA application, or MAX4275BKESA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for single-supply signal conditioning designs requiring internal bias and high DC accuracy.

Technical Context

The MAX4275BKESA integrates a unity-gain-stable op-amp core with laser-trimmed on-chip RF/RG resistor network optimized for +5V/V noninverting configuration. Its internal 150kΩ/150kΩ V_CC/2 bias divider eliminates external bias components for AC-coupled inputs, while ±17V fault protection uses back-to-back SCR structures with 5kΩ current-limiting at IN+ and RG at IN−.

It is decompensated specifically for +5V/V gain (not unity-gain stable), achieving 330kHz −3dB bandwidth and 23MHz GBW product. The device remains stable driving capacitive loads up to 470pF without isolation resistors and maintains rail-to-rail output swing into 1kΩ load across −40°C to +85°C.

Key Specifications

Pinout & Package

SOT23-5 package: compact 2.9mm × 1.6mm surface-mount footprint with exposed pad for thermal performance in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4175BESA+, MAX4275BKESA trades extended temperature rating for lower unit cost and identical functionality at commercial temperatures; versus AD8236ARMZ-R7, it offers simpler biasing, lower power, and tighter gain accuracy-but lacks instrumentation-grade CMRR and reference flexibility.

Availability

MAX4275BKESA is available at Aetrix Electronics and suitable for portable instrumentation, smart-card readers, infrared receivers for remote controls, and low-side current-sense amplifiers requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MAX4275BKESA 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, sensing, interface, and timing applications.

The MAX4275BKESA belongs to the GainAmp™ family of fixed-gain amplifiers engineered for space-constrained, low-power signal conditioning in single-supply systems-emphasizing integration, accuracy, and fault resilience over general-purpose op-amp flexibility.

FAQ

What is the exact gain configuration and tolerance of the MAX4275BKESA?

The MAX4275BKESA is configured for noninverting +5V/V gain with 0.1% factory-trimmed accuracy across −40°C to +85°C. This value is guaranteed by functional test per Maxim's datasheet Rev 3, and reflects the laser-trimmed RF/RG ratio on-die-not an approximation or typical value. The MAX4275BKESA does not support adjustable gain or inverting configurations.

Does the MAX4275BKESA require external biasing components for single-supply operation?

No. The MAX4275BKESA includes internal 150kΩ/150kΩ resistors that bias the IN+ pin to V_CC/2, eliminating external bias networks for AC-coupled inputs. A 0.1µF capacitor from IN+ to GND is recommended to suppress high-frequency supply noise, but no resistors are needed-this is a defining feature of the MAX4275BKESA versus the MAX4174/MAX4274 variants.

What is the maximum capacitive load the MAX4275BKESA can drive without instability?

The MAX4275BKESA remains stable driving up to 470pF directly at its output, as verified in the datasheet's "Capacitive Load Stability" specification (TYP 470pF). This allows direct interfacing with ADC input capacitance, RC filters, or long PCB traces without adding isolation resistors-unlike many rail-to-rail op-amps that oscillate above 100pF.

Can the MAX4275BKESA be used in dual-supply applications?

Yes. Though optimized for single-supply use via internal V_CC/2 bias, the MAX4275BKESA operates from ±1.25V to ±2.75V dual supplies. In dual-supply mode, the IN+ bias defaults to mid-supply (0V), and the device retains all specifications including ±17V input fault protection, 300µA supply current, and rail-to-rail output swing relative to the negative rail.

How does the ±17V input fault protection work in the MAX4275BKESA?

The MAX4275BKESA implements ±17V input fault protection using back-to-back SCR structures at both IN+ and IN− pins, combined with diode clamps to VCC and VEE. At IN+, a 5kΩ series resistor limits current to <3.5mA during overvoltage; at IN−, the internal RG resistor performs the same function. This protects the core op-amp and upstream circuitry without requiring external TVS diodes.