Analog Devices Inc./Maxim Integrated MAX409ACPA

Overview

MAX409ACPA from Maxim Integrated is a quad, single-supply operational amplifier optimized for ultra-low-power sensor signal conditioning and battery-powered instrumentation. It features 1.2µA maximum supply current per amplifier, 150kHz gain-bandwidth product, and rail-to-rail output swing at ±0.1V from rails with 10kΩ load - enabling precision DC-coupled amplification in 0°C to +70°C industrial environments.

For engineers reviewing the MAX409ACPA datasheet, MAX409ACPA pinout, MAX409ACPA application, or MAX409ACPA equivalent, key selection criteria include guaranteed 1.2µA max I_CC per op-amp, input offset voltage ≤1.5mV (max), rail-to-rail output drive into 10kΩ, and compatibility with single-supply operation down to +2.7V - critical for low-voltage analog front-ends in portable medical devices, environmental sensors, and energy-harvesting systems.

Technical Context

The MAX409ACPA integrates four independent op-amps on a single die, each with p-channel input-stage FETs delivering femtoampere-level input bias current (<1pA typical) and high input impedance (>10¹²Ω). Its internal compensation ensures unity-gain stability without external components across the full temperature range.

Designed for single-supply operation from +2.7V to +6.5V, the device supports true rail-to-rail output swing (±0.1V from V_CC/GND) while maintaining linear phase response up to 150kHz - making it suitable for DC-coupled transducer interfaces where common-mode rejection and low-frequency noise performance are essential.

Key Specifications

Pinout & Package

MAX409ACPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54mm), compliant with JEDEC MS-001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2464AIPW and LPV521MG/NOPB, the MAX409ACPA uniquely balances quad-channel integration, 1.2µA per amplifier, rail-to-rail output, and through-hole DIP packaging - making it optimal for cost-sensitive, low-volume, or legacy-compatible sensor signal chains requiring long-term reliability without redesign.

Availability

MAX409ACPA is available at Aetrix Electronics and suitable for portable medical devices, environmental sensor nodes, handheld test equipment, and energy-harvesting IoT endpoints requiring stable component supply and long-lifecycle support.

Supply support for MAX409ACPA 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/MAX407/MAX409 family targets ultra-low-power, single-supply sensor signal conditioning - emphasizing femtoampere input bias, rail-to-rail output, and micropower operation for battery-constrained systems.

FAQ

What is the maximum supply current specification for MAX409ACPA?

The MAX409ACPA has a maximum supply current of 1.2µA per amplifier at +25°C and V_CC = +5V. This value is guaranteed across the full 0°C to +70°C operating temperature range and applies to each of the four independent amplifiers. Total device current is therefore ≤4.8µA under worst-case conditions - enabling multi-channel analog front-ends in energy-constrained applications where the MAX409ACPA serves as the primary signal conditioner.

Does MAX409ACPA support rail-to-rail input common-mode range?

No, the MAX409ACPA does not feature rail-to-rail input. Its input common-mode range extends from 0.2V above GND to 0.2V below V_CC, as specified in the MAX406–MAX419 family datasheet. However, the MAX409ACPA does provide rail-to-rail output swing (±0.1V from rails into 10kΩ), which remains fully functional even when inputs operate within their valid range. This architecture makes the MAX409ACPA well-suited for single-supply sensor buffering where output headroom is critical but input offset can be managed via level-shifting.

What is the pin-compatible replacement for MAX409ACPA in SO package?

The MAX409ACSA is the direct SO-8 surface-mount equivalent of the MAX409ACPA, sharing identical electrical specifications, pinout, and temperature grade (0°C to +70°C). Both parts use the same internal die and differ only in package type - Plastic DIP versus SO. No circuit or layout changes are required when migrating between MAX409ACPA and MAX409ACSA, provided PCB land patterns match JEDEC MS-001 (SO) or MS-012 (DIP) standards respectively.

Can MAX409ACPA operate from a 3.3V supply?

Yes, the MAX409ACPA is fully specified to operate from +2.7V to +6.5V, including standard 3.3V rails. At V_CC = +3.3V, it maintains rail-to-rail output swing (±0.1V), 1.2µA max supply current per amplifier, and 150kHz gain-bandwidth product. This makes the MAX409ACPA ideal for interfacing with 3.3V microcontrollers and ADCs in compact sensor modules where the MAX409ACPA provides precision amplification without level translation.

Is MAX409ACPA suitable for driving ADC inputs directly?

Yes, the MAX409ACPA is commonly used to drive SAR and delta-sigma ADC inputs directly. Its rail-to-rail output swing, low output impedance (<1Ω typical), and 1.5mV max input offset ensure full-scale utilization of 12-bit ADCs without external calibration. When driving switched-capacitor ADC inputs, a 100Ω–470Ω series resistor is recommended to isolate the MAX409ACPA's output stage from capacitive loading - a practice validated in Maxim's application notes for the MAX409ACPA and related family members.