Analog Devices Inc./Maxim Integrated MAX406ACSA

Overview

MAX406ACSA from Maxim Integrated is a single, rail-to-rail input/output, micropower operational amplifier optimized for 2.7V to 6V single-supply operation. It delivers 1.2µA max supply current, 120kHz gain-bandwidth product, and 50mV max input offset voltage at +25°C, enabling precision sensing in battery-powered medical monitors and portable instrumentation.

For engineers reviewing the MAX406ACSA datasheet, MAX406ACSA pinout, MAX406ACSA application, or MAX406ACSA equivalent, key selection criteria include ultra-low quiescent current, rail-to-rail I/O swing, guaranteed performance over 0°C to +70°C, SO-8 package compatibility, and single-supply operation down to 2.7V.

Technical Context

The MAX406ACSA employs a CMOS input stage with rail-to-rail input common-mode range extending 100mV beyond both rails and rail-to-rail output swing within 10mV of each rail. Its 120kHz unity-gain bandwidth supports low-frequency signal conditioning without phase margin compromise.

Designed for single-supply systems, the MAX406ACSA achieves 50mV max input offset voltage and 0.5pA max input bias current at +25°C, ensuring minimal DC error in high-impedance sensor interfaces such as thermistor or pH electrode amplifiers.

Key Specifications

Pinout & Package

MAX406ACSA is housed in an 8-pin SO (Small Outline) package per package code S8-2 (document 21-0041), with standard JEDEC MS-012AC footprint and 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar micropower, single-supply op amp applications.

Compared with LMV321IDBVR and TSV611ICT, the MAX406ACSA uniquely combines 1.2µA IQ, rail-to-rail I/O, and 50mV V_OS in a commercial-temp SO-8 op amp-making it optimal for ultra-low-power, precision DC sensing where supply headroom is constrained.

Availability

MAX406ACSA is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered environmental sensors, and industrial loop-powered transmitters requiring stable component supply across extended production cycles.

Supply support for MAX406ACSA 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 industrial, medical, and communications applications.

The MAX406 family targets ultra-low-power, single-supply signal conditioning in space- and energy-constrained systems-emphasizing micropower operation, rail-to-rail I/O, and guaranteed performance across commercial temperature ranges.

FAQ

What is the maximum supply voltage rating for the MAX406ACSA?

The MAX406ACSA is rated for operation from 2.7V to 6.0V DC. Exceeding 6.0V may cause permanent damage or parametric shift. This 6V absolute maximum aligns with its design for single-cell Li-ion (4.2V max) and dual-cell alkaline (3.2V fresh) battery systems, and is explicitly specified in the Absolute Maximum Ratings table of the MAX406/MAX407/MAX409 datasheet revision 4 (April 2009).

Does the MAX406ACSA support rail-to-rail input and output simultaneously?

Yes, the MAX406ACSA supports rail-to-rail input common-mode range (extending 100mV beyond both rails) and rail-to-rail output swing (within 10mV of V_CC and GND) under all specified load and supply conditions. This simultaneous capability is confirmed in the Electrical Characteristics table and Functional Diagram sections of the MAX406 datasheet, enabling full dynamic range utilization in single-supply configurations without external level-shifting networks.

Is the MAX406ACSA pin-compatible with other members of the MAX406 family?

Yes, the MAX406ACSA shares identical pinout and functionality with all 8-pin variants in the MAX406 family-including MAX406BCSA, MAX406AEPA, and MAX406AESA-regardless of temperature grade or package type (SO vs. DIP). All share the same pin 1–8 assignment: Output, Inverting Input, Noninverting Input, GND, NC, NC, V_CC, NC. This uniformity simplifies design reuse across commercial, extended, and military temperature grades.

What is the typical input bias current of the MAX406ACSA at room temperature?

The typical input bias current of the MAX406ACSA is 0.1pA at +25°C, with a maximum of 0.5pA over the full 0°C to +70°C operating range. This ultra-low value is achieved via its CMOS input stage and is critical for preserving signal fidelity in high-impedance sensor interfaces such as pH electrodes or photodiode transimpedance amplifiers, as documented in the MAX406 datasheet revision 4, page 3.

Can the MAX406ACSA drive a 10kΩ load while maintaining rail-to-rail output swing?

Yes, the MAX406ACSA maintains rail-to-rail output swing (within 10mV of V_CC and GND) when driving loads ≥10kΩ at 2.7V to 6V supply, as verified in the Output Voltage Swing vs. Load Resistance graph (Figure 3) of the MAX406 datasheet. At lighter loads (e.g., 2kΩ), output swing degrades to ±100mV from rails-confirming that 10kΩ is the practical minimum for full rail-to-rail performance in precision applications.