Analog Devices Inc./Maxim Integrated MAX4075BJESA

Overview

The MAX4075BJESA from Maxim Integrated is a single-channel, fixed-gain, rail-to-rail output operational amplifier in an 8-pin SO package, featuring factory-trimmed internal resistors for ±0.1% gain accuracy, ±17V input fault protection, 34µA supply current, and operation from +2.5V to +5.5V. It delivers noninverting gain of +101V/V and is used in low-side current-sense amplification and photodiode preamplification where precision, micropower, and robust input handling are critical.

For engineers reviewing the MAX4075BJESA datasheet, MAX4075BJESA pinout, MAX4075BJESA application, or MAX4075BJESA equivalent, key selection criteria include confirmed noninverting gain (+101V/V), ±17V fault-tolerant inputs, rail-to-rail output swing into 1kΩ, 0.1% resistor-matched gain accuracy, and SOT23-5/SO package compatibility across the GainAmp family.

Technical Context

The MAX4075BJESA implements a decompensated op amp core optimized for fixed-gain operation at AV = +101V/V, achieving a 4MHz gain-bandwidth product while maintaining stability with up to 100pF capacitive loads. Its internal laser-trimmed RF/RG network sets gain without external components, eliminating layout sensitivity and resistor matching errors.

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 common-mode input range extends from VEE −0.15V to VCC −1.2V for the noninverting input, while the inverting input voltage range is constrained by the series RG resistor per the internal feedback topology.

Key Specifications

Pinout & Package

MAX4075BJESA is housed in an 8-pin SO (Small Outline) package, measuring 4.9mm × 3.9mm × 1.75mm, with standard SOIC lead pitch (1.27mm) and gull-wing leads compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4075AJESA and MAX4075CJESA, the MAX4075BJESA provides the highest noninverting gain (+101V/V) in the SO-packaged GainAmp family, enabling maximum signal utilization from ultra-low-level sources while retaining identical micropower operation, fault resilience, and PCB footprint.

Availability

MAX4075BJESA is available at Aetrix Electronics and suitable for photodiode preamplification, low-side current sensing, and smart-card reader interface applications requiring stable component supply, long-term lifecycle support, and guaranteed gain accuracy.

Supply support for MAX4075BJESA 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 precision analog and mixed-signal ICs for industrial, medical, communications, and consumer applications.

The MAX4075BJESA belongs to the GainAmp™ fixed-gain op amp product line, engineered to replace discrete op amp + resistor networks in space-constrained, low-power systems demanding metrology-grade gain accuracy and rugged input handling.

FAQ

What is the exact gain value and configuration of the MAX4075BJESA?

The MAX4075BJESA is a noninverting fixed-gain amplifier with a precisely trimmed gain of +101V/V, confirmed by its top-mark "BJ" in the Gain Selector Guide. This gain is implemented via internal laser-trimmed RF and RG resistors (RF/RG = 100), delivering ±0.1% accuracy without external components. The device does not support inverting configurations or user-adjustable gain.

Does the MAX4075BJESA support dual-supply operation?

Yes, the MAX4075BJESA operates from ±1.25V to ±2.75V dual supplies, in addition to its primary +2.5V to +5.5V single-supply range. When using dual supplies, VEE connects to the negative rail and VCC to the positive rail. Input common-mode range extends from VEE −0.15V to VCC −1.2V, and rail-to-rail output swing is maintained under both supply configurations.

What is the maximum capacitive load the MAX4075BJESA can drive stably?

The MAX4075BJESA is specified to remain stable with capacitive loads up to 100pF without requiring external isolation resistors. This is validated across all gain versions in the MAX4074–MAX4078 family. For loads exceeding 100pF, a series isolation resistor (e.g., 100Ω) between the output and load restores phase margin and prevents oscillation, as documented in the Capacitive-Load Stability section.

How does the ±17V input fault protection work on the MAX4075BJESA?

The MAX4075BJESA incorporates back-to-back SCR structures and diode clamps at both IN+ and IN− pins. During ±17V overvoltage, current is limited to <3.5mA by a 5kΩ resistor on IN+ and the internal RG on IN−. This protects both the amplifier and upstream signal source from damage while preventing output phase reversal - a key reliability feature for sensor front-ends exposed to ESD or wiring faults.

Is the MAX4075BJESA pin-compatible with other devices in the MAX4074–MAX4078 family?

The MAX4075BJESA uses an 8-pin SO package shared with MAX4074, MAX4077, and MAX4078 variants, but pin functions differ across types. Specifically, pins 6 (RF) and 7 (RG) are internal gain-setting terminals not present in open-loop versions (MAX4076/MAX4077/MAX4078). Therefore, it is not pin-compatible with those parts - board designs must match the exact GainAmp variant's pinout, especially for RF/RG connections.