Analog Devices Inc./Maxim Integrated MAX4174BKEUK-T

Overview

MAX4174BKEUK-T from Maxim Integrated is a single-channel, noninverting fixed-gain amplifier with internal precision resistors, delivering +5V/V gain, 0.1% gain accuracy, rail-to-rail output swing, and ±17V input fault protection. It operates from a +2.5V to +5.5V single supply, consumes only 300µA, and targets low-side current-sense and portable instrument signal conditioning.

For engineers reviewing the MAX4174BKEUK-T datasheet, MAX4174BKEUK-T pinout, MAX4174BKEUK-T application, or MAX4174BKEUK-T equivalent, key selection criteria include guaranteed DC gain accuracy, capacitive-load stability up to 470pF, GBW-optimized compensation for +5V/V, input voltage range compliance in single-supply configurations, and SOT23-5 footprint compatibility.

Technical Context

The MAX4174BKEUK-T integrates a rail-to-rail output op-amp core with laser-trimmed on-chip feedback resistors (RF/RG) to fix noninverting gain at +5V/V. Its internal decompensation is optimized specifically for this gain setting, achieving 330kHz –3dB bandwidth and 23MHz GBW product while maintaining stability without external compensation.

Input structure includes back-to-back SCR-based ±17V fault protection and diode clamping; the inverting input connects directly to RG, limiting its common-mode range to VEE ≤ VIN− ≤ VCC, while the noninverting input accepts VEE − 0.15V to VCC − 1.2V in open-loop variants-but in MAX4174 (non-biased), IN+ is externally referenced.

Key Specifications

Pinout & Package

SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with exposed pad option (not applicable here); thermally efficient for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4174AKEUK-T, the MAX4174BKEUK-T provides higher signal gain for small differential voltages while retaining identical accuracy and protection; versus MAX4274BKEUK-T, it offers half the channel count in a smaller SOT23-5 footprint-ideal for single-signal paths where size is paramount.

Availability

MAX4174BKEUK-T is available at Aetrix Electronics and suitable for low-side current-sense, portable instrumentation, and infrared receiver applications requiring stable component supply, guaranteed gain accuracy, and robust fault tolerance.

Supply support for MAX4174BKEUK-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) designs high-performance analog and mixed-signal ICs for power, sensing, and signal-chain applications.

The MAX4174BKEUK-T belongs to the GainAmp™ family-engineered to replace discrete op-amp + resistor networks with monolithic, factory-trimmed fixed-gain amplifiers for space- and cost-sensitive signal conditioning.

FAQ

What is the exact gain configuration of the MAX4174BKEUK-T?

The MAX4174BKEUK-T is a noninverting fixed-gain amplifier with precisely trimmed +5V/V gain. This value is confirmed in the Gain Selection Guide and Electrical Characteristics table under "DC Gain Accuracy" for AV = +5V/V. The internal RF/RG ratio is laser-adjusted to deliver ±0.1% tolerance across –40°C to +85°C, eliminating need for external gain-setting components.

Does the MAX4174BKEUK-T include internal VCC/2 biasing at the noninverting input?

No, the MAX4174BKEUK-T does not include internal VCC/2 biasing. That feature is exclusive to the MAX4175/MAX4275 variants. The MAX4174BKEUK-T requires external DC biasing of the IN+ pin for single-supply operation-typically via resistor divider or reference voltage-to establish proper common-mode operating point.

Can the MAX4174BKEUK-T drive a 1000pF capacitive load?

The MAX4174BKEUK-T is specified stable up to 470pF without external compensation. Driving 1000pF directly risks peaking or oscillation. To maintain stability, add a 100Ω isolation resistor in series with the output, as validated in Figure 10 of the datasheet-this preserves phase margin while supporting larger loads.

What is the maximum input voltage range for the IN− pin of the MAX4174BKEUK-T?

The IN− pin of the MAX4174BKEUK-T must remain within the supply rails: VEE ≤ VIN− ≤ VCC. Exceeding this range may cause distortion due to internal diode clamping. Unlike the IN+ pin, IN− connects directly to the internal RG resistor and lacks extended common-mode capability-designs requiring rail-exceeding inputs should use the MAX4281 open-loop op-amp instead.

Is the MAX4174BKEUK-T pin-compatible with other SOT23-5 op-amps?

The MAX4174BKEUK-T uses standard SOT23-5 pinout (IN−, OUT, VCC, VEE, IN+) and matches industry-standard op-amp assignments-enabling drop-in replacement in many existing layouts. However, its fixed +5V/V gain and internal resistor network mean it cannot substitute for general-purpose op-amps requiring external feedback; verify functional compatibility before board-level reuse.