Analog Devices Inc./Maxim Integrated MAX4490AUK+T

Overview

MAX4490AUK+T from Maxim Integrated is a single-channel, rail-to-rail input/output CMOS operational amplifier in SC70-5 package, designed for low-voltage, low-power signal conditioning. It operates from 2.7V to 5.5V single supply, delivers 10MHz gain-bandwidth product, 10V/µs slew rate, and drives 2kΩ loads within 55mV of either rail - ideal for battery-powered sensor front-ends and portable audio circuits.

For engineers reviewing the MAX4490AUK+T datasheet, MAX4490AUK+T pinout, MAX4490AUK+T application, or MAX4490AUK+T equivalent, key selection criteria include rail-to-rail I/O performance at 800µA supply current, 50pA input bias current, capacitive-load stability up to 300pF, and guaranteed operation across –40°C to +125°C automotive temperature range.

Technical Context

The MAX4490AUK+T employs parallel N- and P-channel differential input stages enabling rail-to-rail common-mode input range (VSS to VDD), with seamless handoff near VSS + 1.2V and VDD – 1.2V. Its class-AB push-pull output stage achieves ±50mA short-circuit current and maintains 1.5mV output swing headroom into 100kΩ loads.

It features unity-gain stability with up to 300pF capacitive load, supported by internal compensation. Input capacitance is 5pF (typ), requiring R′ < 3kΩ for optimal phase margin when used in inverting/noninverting configurations with GBWP = 10MHz.

Key Specifications

Pinout & Package

MAX4490AUK+T is housed in an ultra-small 5-pin SC70-5 package (2.0mm × 1.25mm, 0.65mm pitch), 50% smaller than standard SOT23-5 - optimized for space-constrained portable and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSV911ICT and MCP6001UT-E/OT, the MAX4490AUK+T uniquely balances 10MHz bandwidth, 10V/µs slew rate, and 800µA supply current in SC70-5 - making it the only option among the three qualified for automotive-grade, high-speed, low-voltage signal chains requiring guaranteed –40°C to +125°C operation.

Availability

MAX4490AUK+T is available at Aetrix Electronics and suitable for battery-powered instruments, portable equipment, and automotive sensor amplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4490AUK+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, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX4490AUK+T belongs to Maxim's low-cost, high-slew-rate rail-to-rail op amp family - engineered specifically for space- and power-constrained applications demanding wide supply range, robust capacitive-load drive, and automotive-grade reliability.

FAQ

What is the maximum capacitive load the MAX4490AUK+T can drive without oscillation?

The MAX4490AUK+T is unity-gain stable with capacitive loads up to 300pF, as confirmed in the datasheet's Capacitive-Load Stability chart and Typical Operating Characteristics (Figure 4). This applies with resistive loads ≥100kΩ; for lower resistive loads (e.g., 2kΩ), stability margin decreases - use an isolation resistor (e.g., 10Ω) if driving >300pF. The MAX4490AUK+T does not require external compensation under these conditions.

Does the MAX4490AUK+T support dual-supply operation?

Yes, the MAX4490AUK+T supports dual-supply operation from ±1.35V to ±2.75V, as specified in the General Description and Absolute Maximum Ratings. In dual-supply mode, VSS is connected to the negative rail (e.g., –2.75V) and VDD to the positive rail (e.g., +2.75V), enabling symmetric rail-to-rail input/output swing around ground. The MAX4490AUK+T maintains its 10MHz GBWP and 10V/µs slew rate across this range.

What is the input common-mode voltage range of the MAX4490AUK+T?

The MAX4490AUK+T features true rail-to-rail input capability: its input common-mode voltage range extends from VSS to VDD, verified across –40°C to +125°C. This is achieved via parallel N- and P-channel input stages that switch seamlessly near VSS + 1.2V and VDD – 1.2V. The MAX4490AUK+T thus accepts inputs at ground or supply rails without phase reversal or increased distortion - critical for single-supply sensor interfaces.

How does the MAX4490AUK+T perform in terms of input offset voltage over temperature?

The MAX4490AUK+T guarantees input offset voltage of ±10mV maximum over the full –40°C to +125°C automotive temperature range, with typical values of ±1.5mV at +25°C (Electrical Characteristics table). The offset drift is characterized in Figure MAX4490 toc03, showing <2mV variation from –40°C to +85°C and <4mV up to +125°C. This stability makes the MAX4490AUK+T suitable for DC-coupled precision amplification where offset calibration is impractical.

Is the MAX4490AUK+T pin-compatible with other op amps in SC70-5 package?

No - the MAX4490AUK+T has a unique pinout (IN+, VSS, IN−, OUT, VDD) that differs from industry-standard SC70-5 op amps like the MCP6001 or TS911, which typically place VDD on pin 5 and VSS on pin 2 but assign IN−/IN+/OUT differently. Layout reuse is not possible without verification; the MAX4490AUK+T requires dedicated footprint design per its Pin Description table. Always confirm pin mapping before PCB revision.