Analog Devices Inc./Maxim Integrated MAX4174AKEUK+T

Overview

MAX4174AKEUK+T from Maxim Integrated is a single-channel, noninverting fixed-gain amplifier with internal precision resistors, delivering +5V/V gain accuracy of ±0.1%, rail-to-rail output swing, and 300µA supply current. It operates from +2.5V to +5.5V and features ±17V input fault protection-ideal for low-side current-sense amplification in portable instrumentation and smart-card readers.

For engineers reviewing the MAX4174AKEUK+T datasheet, MAX4174AKEUK+T pinout, MAX4174AKEUK+T application, or MAX4174AKEUK+T equivalent, key selection criteria include guaranteed DC gain accuracy, capacitive-load stability up to 470pF, GBW-optimized compensation for +5V/V gain, and SOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX4174AKEUK+T integrates a rail-to-rail output op-amp core with laser-trimmed on-chip feedback resistors (RF/RG), enabling factory-set noninverting gain of +5V/V without external components. Its internal decompensation is optimized specifically for this gain, achieving 330kHz −3dB bandwidth and 23MHz GBW product.

Input structure includes diode clamping and back-to-back SCR protection at both IN+ and IN− pins, allowing ±17V fault tolerance relative to VEE while limiting input current to <3.5mA. The inverting input connects directly to RG, constraining its voltage range to within the supply rails to avoid distortion.

Key Specifications

Pinout & Package

SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with exposed pad (not electrically connected), rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4174AEUK+T, the MAX4174AKEUK+T offers higher bandwidth for +5V/V gain but less headroom for large input signals; versus MAX4274AESA+, it trades thermal robustness and package size for minimal board area and lower power in consumer-grade temperature ranges.

Availability

MAX4174AKEUK+T is available at Aetrix Electronics and suitable for low-side current-sense, portable instrumentation, and smart-card reader applications requiring stable component supply, guaranteed gain accuracy, and rapid prototyping support.

Supply support for MAX4174AKEUK+T 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 interface applications.

The MAX4174AKEUK+T belongs to the GainAmp™ family of fixed-gain amplifiers, designed to replace discrete op-amp-plus-resistor configurations with factory-trimmed precision, reducing design time and improving production yield in cost-sensitive portable systems.

FAQ

What is the exact gain configuration of the MAX4174AKEUK+T?

The MAX4174AKEUK+T is configured for noninverting +5V/V fixed gain using laser-trimmed internal RF/RG resistors. This gain is factory-set and unchangeable; the 'K' in the part number denotes the +5V/V variant per Maxim's Gain Selection Guide. No external resistors are required to achieve this gain, and accuracy is guaranteed at ±0.1% over temperature.

Does the MAX4174AKEUK+T include internal VCC/2 biasing at the noninverting input?

No, the MAX4174AKEUK+T does not include internal VCC/2 biasing. That feature is exclusive to the MAX4175 series (e.g., MAX4175). The MAX4174AKEUK+T has a standard noninverting input (IN+) that must be externally biased for single-supply AC-coupled operation. Its IN+ pin accepts a common-mode range from VEE to VCC − 1.2V and is intended for DC-coupled or externally referenced applications.

Can the MAX4174AKEUK+T drive a 1000pF capacitive load without oscillation?

No - the MAX4174AKEUK+T is only guaranteed stable with capacitive loads up to 470pF. Driving 1000pF directly will likely cause peaking or oscillation. To drive larger loads, add a 100Ω isolation resistor in series with the output (as shown in Figure 9 of the datasheet), which restores phase margin and enables stable operation with 1000pF and higher.

What is the maximum input voltage range for the inverting input (IN−) of the MAX4174AKEUK+T?

The IN− pin of the MAX4174AKEUK+T must remain within the supply rails (VEE to VCC) at all times. Unlike the IN+ pin, it is not protected beyond the rails and connects directly to the internal RG resistor. Exceeding VEE or VCC at IN− may cause signal distortion due to internal diode conduction - this limitation is inherent to the integrated feedback resistor topology and is explicitly documented in the Applications Information section.

Is the MAX4174AKEUK+T RoHS-compliant and lead-free?

Yes, the MAX4174AKEUK+T is RoHS-compliant and lead-free. It meets EU Directive 2011/65/EU and carries the "+" suffix in its part number, which Maxim designates for lead-free, halogen-free, and RoHS-compliant packaging. The SOT23-5 package uses matte tin lead finish and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1).