Analog Devices Inc./Maxim Integrated MAX4462UEUT-T

Overview

The MAX4462UEUT-T from Maxim Integrated is a precision rail-to-rail output instrumentation amplifier in 6-pin SOT23 package, featuring fixed gains of 1, 10, or 100 (U = gain 1), ±0.1% gain accuracy, 100µV input offset voltage, and 2.5MHz gain-bandwidth product. It operates from 2.85V to 5.25V single supply or ±2.6V dual supply, with REF pin enabling bipolar signal handling in single-supply systems-ideal for strain-gauge amplification and low-side current sensing.

For engineers reviewing the MAX4462UEUT-T datasheet, MAX4462UEUT-T pinout, MAX4462UEUT-T application, or MAX4462UEUT-T equivalent, key selection criteria include its REF-input–enabled zero-differential-output voltage setting, ground-sensing capability down to VSS − 0.1V, 1pA typical input bias current, and factory-trimmed gain accuracy across temperature.

Technical Context

The MAX4462UEUT-T implements Maxim's proprietary indirect current-feedback architecture, converting differential input voltage to current via transconductance stages and using feedback subtraction to drive a high-gain loop amplifier with Class AB output. This enables ground-sensing operation while maintaining ultra-low input bias current and enhanced CMRR.

Unlike traditional three-op-amp IAs, it supports true input common-mode range from VSS − 0.1V to VDD − 1.7V and REF-referenced output swing from VSS + 0.1V to VDD − 1.7V. Its REF pin allows precise bipolar output centering-e.g., connecting REF to VDD/2 maximizes symmetrical swing in single-supply configurations.

Key Specifications

Pinout & Package

MAX4462UEUT-T is housed in a 6-pin SOT23 package (JEDEC MO-178AA), footprint-compatible with industry-standard space-constrained PCB layouts. The exposed pad (EP) is internally connected to VSS and must be soldered to PCB ground plane for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8221ARMZ-R7 and INA333AIDBVR, the MAX4462UEUT-T uniquely combines factory-trimmed fixed gain, integrated REF pin for single-supply bipolar operation, and 6-pin SOT23 footprint-reducing BOM count and PCB area while maintaining 1pA input bias and 2.5MHz GBWP for responsive sensor interfaces.

Availability

MAX4462UEUT-T is available at Aetrix Electronics and suitable for industrial process control, strain-gauge amplification, and battery-powered medical equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MAX4462UEUT-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 precision sensing, power management, and communications applications.

The MAX4462UEUT-T belongs to Maxim's precision instrumentation amplifier family, engineered specifically for space-constrained, low-power, single-supply systems requiring ground-sensing capability and factory-trimmed gain accuracy without external components.

FAQ

What is the function of the REF pin on the MAX4462UEUT-T?

The REF pin on the MAX4462UEUT-T sets the output voltage for zero differential input, enabling bipolar signal handling in single-supply applications. When a reference voltage (e.g., VDD/2) is applied to REF, the output centers at that voltage-so a 0V differential input yields VOUT = VREF. This eliminates the need for external level-shifting circuitry and supports full rail-to-rail swing around the reference point. The REF input range is specified from VSS + 0.1V to VDD − 1.7V.

Does the MAX4462UEUT-T support dual-supply operation?

Yes, the MAX4462UEUT-T supports dual-supply operation with VDD up to +2.6V and VSS down to −2.6V. In this configuration, the REF pin should be connected to ground to establish a zero-centered output. The input common-mode range extends from VSS − 0.1V to VDD − 1.7V, and the REF input range remains VSS + 0.1V to VDD − 1.7V-ensuring compatibility with split-rail sensor interfaces. The MAX4462UEUT-T maintains its 2.5MHz gain-bandwidth product and ±0.1% gain accuracy under dual-supply conditions.

What is the maximum capacitive load the MAX4462UEUT-T can drive without instability?

The MAX4462UEUT-T is stable with capacitive loads up to 100 pF, as confirmed by the manufacturer's electrical characteristics table and typical operating curves. Driving larger loads may cause peaking or oscillation due to phase margin degradation. For loads exceeding 100 pF-including long PCB traces or ADC input capacitance-a series resistor (typically 10–50Ω) should be placed between the MAX4462UEUT-T output and the load to isolate capacitance and restore stability. This isolation technique preserves signal integrity while maintaining monotonic step response.

How does the MAX4462UEUT-T achieve ground-sensing capability?

The MAX4462UEUT-T achieves ground-sensing capability through its proprietary indirect current-feedback architecture, which allows the input stage to operate with common-mode voltages as low as VSS − 0.1V-even when VSS = 0V (single supply). This is enabled by MOS input transistors with ultra-low gate leakage (<1pA), eliminating the base-current limitations of bipolar-input IAs. As a result, the MAX4462UEUT-T can directly amplify signals from low-side current-sense shunts or bridge circuits referenced to system ground without level-shifting or bootstrapping circuitry.

What are the gain options and suffix coding for the MAX4462UEUT-T?

The MAX4462UEUT-T has a fixed gain of 1×, indicated by the "U" suffix in the part number. The MAX4462 family offers three factory-trimmed gain options: U = G=1, T = G=10, and H = G=100-all with ±0.1% gain error at +25°C. The "EUT-T" packaging designation specifies −40°C to +85°C temperature range, 6-pin SOT23 package, and tape-and-reel delivery. Gain cannot be adjusted externally-the MAX4460 is the adjustable-gain variant in this family, using FB and external resistors.