Analog Devices Inc./Maxim Integrated MAX4484AUK-T

Overview

The MAX4484AUK-T from Maxim Integrated is a single, rail-to-rail output operational amplifier optimized for low-cost, single-supply systems operating from +2.7V to +5.5V. It delivers 7MHz gain-bandwidth, drives 2kΩ loads with <30mV from rails, and remains stable with up to 100pF capacitive load-enabling precision signal conditioning in portable instrumentation and sensor interfaces.

For engineers reviewing the MAX4484AUK-T datasheet, MAX4484AUK-T pinout, MAX4484AUK-T application, or MAX4484AUK-T equivalent, key selection criteria include its -40°C to +125°C operating range, ground-sensing inputs, no phase reversal on overdrive, 85dB open-loop gain at 2kΩ, and SOT23-5 packaging for space-constrained PCBs.

Technical Context

This op amp uses a CMOS input stage enabling picoampere-level input bias current (±0.1pA typ), high input resistance (>1000GΩ), and rail-to-rail common-mode input range (VSS to VDD − 1.3V). Its unity-gain stable architecture supports fast settling (450ns to 0.01%) and 20V/µs slew rate without external compensation.

Designed for single-supply operation, it features true ground-sensing inputs and rail-to-rail output swing-critical for zero-crossing detection and sensor front-ends where input signals extend to VSS. The internal topology avoids phase reversal when inputs exceed supply rails, eliminating latch-up risk in transient-prone environments.

Key Specifications

Pinout & Package

The MAX4484AUK-T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), footprint-compatible with industry-standard SOT-23 layouts and optimized for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV321IDBVR and TSV911ICT, the MAX4484AUK-T uniquely combines 7MHz bandwidth, -40°C to +125°C qualification, rail-to-rail output into 2kΩ, and no-phase-reversal behavior-making it the only option among the three qualified for harsh-environment zero-crossing and sensor front-end designs.

Availability

MAX4484AUK-T is available at Aetrix Electronics and suitable for portable communicators, electronic ignition modules, infrared receivers, and sensor signal detection systems requiring stable component supply across extended temperature ranges.

Supply support for MAX4484AUK-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 industrial, automotive, communications, and computing applications.

The MAX4484AUK-T belongs to Maxim's general-purpose op amp family targeting cost-sensitive, single-supply systems needing rail-to-rail performance, wide temperature operation, and robust capacitive-load drive-especially in portable and automotive-adjacent electronics.

FAQ

What is the maximum capacitive load the MAX4484AUK-T can drive without oscillation?

The MAX4484AUK-T is unity-gain stable with capacitive loads up to 100pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure 2). This allows direct connection to ADC inputs or long PCB traces without requiring an isolation resistor-unlike many general-purpose op amps that require external compensation for loads >10pF. The MAX4484AUK-T maintains phase margin ≥55° under this condition.

Does the MAX4484AUK-T support true ground-sensing input operation?

Yes-the MAX4484AUK-T accepts common-mode input voltages from VSS (0V) to VDD − 1.3V, enabling direct interfacing with ground-referenced sensors, shunt current monitors, and single-ended signal sources. This is explicitly specified in the Electrical Characteristics table under "Input Common-Mode Voltage Range" and validated across the full -40°C to +125°C temperature range.

What is the typical supply current of the MAX4484AUK-T at +5.0V?

The MAX4484AUK-T draws 2.2mA typical supply current per amplifier at +5.0V (VDD = +5.0V, VSS = 0V), as stated in the Electrical Characteristics table. This value increases slightly to 2.3mA at +2.7V and remains stable across temperature-supporting predictable power budgeting in battery-operated devices like portable communicators and remote controls.

Is the MAX4484AUK-T pin-compatible with other members of the MAX448x family?

No-the MAX4484AUK-T (single, SOT23-5) has a different pinout than the dual MAX4486 or quad MAX4487 variants. While all share functional pin roles (e.g., IN+, IN−, OUT, VDD, VSS), the MAX4484AUK-T uses a 5-pin layout with dedicated pins for each function, whereas the dual and quad versions multiplex channels across 8- or 14-pin packages. Board redesign is required when substituting between family members.

What is the large-signal voltage gain (AVOL) of the MAX4484AUK-T when driving a 2kΩ load?

The MAX4484AUK-T delivers 76dB to 85dB large-signal open-loop voltage gain (AVOL) into a 2kΩ load, as specified in the Electrical Characteristics table. This corresponds to a minimum gain of ~6300 V/V, sufficient for precision DC amplification in sensor signal chains where gain accuracy and linearity must be maintained across temperature and supply variation.