Analog Devices Inc./Maxim Integrated MAX44281VANS+T

Overview

MAX44281VANS+T from Maxim Integrated is a precision noninverting operational amplifier with fixed +2V/V gain, rail-to-rail output, 15MHz gain-bandwidth product, 100µV input offset voltage, and 700µA supply current - designed for sensor signal conditioning in space-constrained portable medical and consumer devices.

For engineers reviewing the MAX44281VANS+T datasheet, MAX44281VANS+T pinout, MAX44281VANS+T application, or MAX44281VANS+T equivalent, this page delivers verified electrical specs, WLP package layout, shutdown behavior, noise performance, and real-world interface use cases - all confirmed against Maxim's official documentation and production test data.

Technical Context

The MAX44281VANS+T implements a high-speed, low-noise CMOS input stage with rail-to-rail output swing and internal gain-setting resistors for fixed +2V/V operation. Its architecture supports single-supply operation from 1.8V to 5.5V and features integrated ESD protection diodes at the output.

Shutdown is activated by pulling VDD below 0.5V, placing both input and output in high-impedance state - with output voltage clamped to approximately ±0.6V relative to GND due to forward-biased ESD diodes. The device remains stable driving capacitive loads up to 400pF when isolated with a series resistor.

Key Specifications

Pinout & Package

MAX44281VANS+T uses an ultra-small, 0.85mm × 0.85mm, 4-bump Wafer-Level Package (WLP) with 0.4mm bump pitch and 0.5mm height - optimized for PCB area savings in wearables and implantable-grade modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar noninverting op amp applications.

Compared with MAX44281VANS+T, MAX44268VANS+T trades lower precision and higher power for stronger output drive, while AD8607ARMZ-REEL offers better DC accuracy but sacrifices size, integration, and true rail-to-rail output - making MAX44281VANS+T optimal for ultra-compact, battery-sensitive medical sensor nodes.

Availability

MAX44281VANS+T is available at Aetrix Electronics and suitable for wearable physiological monitoring, portable diagnostic sensors, and low-power medical IoT nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX44281VANS+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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications - emphasizing small size, low power, and high reliability.

The MAX44281 family was developed specifically to address space and power constraints in portable medical and consumer electronics - delivering precision op amp performance in the industry's smallest 4-bump WLP package.

FAQ

What is the exact gain configuration of the MAX44281VANS+T?

The MAX44281VANS+T is factory-configured as a noninverting amplifier with fixed +2V/V gain. This gain is set by internal laser-trimmed thin-film resistors - no external feedback components are required. The "V" in the part number explicitly denotes the +2V/V variant, distinct from the "O" (+1V/V) and "U" (+10V/V) versions. MAX44281VANS+T maintains this gain across its full -40°C to +125°C operating range with ≤0.6% max gain error.

How does shutdown mode work on the MAX44281VANS+T?

Shutdown on the MAX44281VANS+T is activated by pulling the VDD pin below 0.5V - typically achieved using a logic-level MOSFET or open-drain driver. During shutdown, both input and output enter high-impedance states. Due to internal ESD diodes, the output voltage is clamped to approximately ±0.6V relative to GND. Shutdown current drops to 1µA, enabling ultra-low-power duty-cycled operation in battery-powered devices like portable glucose meters.

Can the MAX44281VANS+T drive capacitive loads reliably?

Yes - the MAX44281VANS+T is stable driving capacitive loads up to 400pF when a series isolation resistor (≥50Ω) is placed between the output and the load. Without isolation, oscillation may occur above ~100pF. This capability is validated in Maxim's Typical Operating Characteristics graphs (toc02b), making MAX44281VANS+T suitable for driving ADC input filters, LCD bias networks, or piezoelectric sensor cables without external compensation.

What is the input voltage range specification for the MAX44281VANS+T?

For the MAX44281VANS+T (+2V/V gain), the input voltage range is specified as 0.05V to (VDD – 0.1V)/2 - meaning it supports rail-to-rail input down to 50mV above GND and up to half the supply minus 100mV. At VDD = 3.3V, this translates to 0.05V to 1.55V. This range ensures compatibility with single-supply sensor interfaces where common-mode voltage falls near mid-supply or ground.

Is the MAX44281VANS+T RoHS-compliant and lead-free?

Yes - the "+T" suffix in MAX44281VANS+T indicates a lead(Pb)-free and RoHS-compliant package. The device uses a wafer-level package with matte tin finish on bumps and conforms to JEDEC J-STD-020 reflow profile requirements. Maxim's package drawing 21-0612 and Application Note 1891 confirm Pb-free construction, and the + symbol in the package code explicitly denotes RoHS compliance per Maxim's ordering information table.