Analog Devices Inc./Maxim Integrated MAX409AEPA

Overview

MAX409AEPA from Maxim Integrated is a quad, single-supply operational amplifier optimized for ultra-low-power sensor signal conditioning in industrial and portable systems. It features 1.2µA max supply current per amplifier, 150kHz gain-bandwidth product, ±15mV input offset voltage (max), rail-to-rail output swing, and operates from +2.7V to +16V over –40°C to +85°C.

For engineers reviewing the MAX409AEPA datasheet, MAX409AEPA pinout, MAX409AEPA application, or MAX409AEPA equivalent, key selection criteria include quiescent current budget, input offset stability across temperature, single-supply rail-to-rail output capability, and DIP-8 package compatibility with legacy through-hole layouts.

Technical Context

The MAX409AEPA integrates four independent op-amps on a single die with matched internal biasing to maintain consistent 1.2µA max I_CC per channel across temperature. Its input stage uses p-channel JFET inputs for low input bias current (1pA typ) and high input impedance (>10¹²Ω).

Designed for single-supply operation, the device achieves rail-to-rail output swing within 20mV of V_CC and ground, enabling full dynamic range utilization in 3.3V or 5V systems without dual supplies. Input common-mode range extends to V_CC – 1.2V.

Key Specifications

Pinout & Package

MAX409AEPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard through-hole footprint (package code P8-1). Pin spacing is 0.1 inch, compatible with MIL-STD-883-compliant PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2464AIDR and LPV521MG/NOPB, the MAX409AEPA uniquely balances sub-µA per-amp consumption, quad integration in DIP-8, and industrial temperature range - making it optimal for legacy-compatible, battery-critical, multi-sensor systems where PCB real estate and power are tightly constrained.

Availability

MAX409AEPA is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable safety equipment, and remote environmental monitoring systems requiring stable component supply and long-term manufacturability.

Supply support for MAX409AEPA 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 signal conditioning - specifically for battery-operated and energy-harvesting sensor nodes where microamp-level quiescent current is mandatory.

FAQ

What is the maximum supply voltage for MAX409AEPA?

The MAX409AEPA supports a supply voltage range of +2.7V to +16V. This allows direct use in both low-voltage battery systems (e.g., 3.3V or 5V rails) and higher-voltage industrial applications (e.g., 12V PLC I/O modules). Operation above +16V may damage the MAX409AEPA, and operation below +2.7V results in degraded output swing and increased input offset drift.

Does MAX409AEPA support rail-to-rail input?

No, the MAX409AEPA does not feature rail-to-rail input. Its input common-mode range extends to V_CC – 1.2V but does not include the positive rail. However, it does provide rail-to-rail output swing within 20mV of both V_CC and GND. This makes the MAX409AEPA suitable for output-critical single-supply applications where input signals remain ≥1.2V below V_CC.

Is MAX409AEPA pin-compatible with other devices in the MAX406–MAX419 family?

Yes, MAX409AEPA is pin-compatible with all 8-pin variants in the MAX406/MAX407/MAX409/MAX417–MAX419 family, including MAX406AEPA, MAX407EPA, and MAX417EPA. All share identical DIP-8 pinout and electrical pin functions. Differences lie solely in guaranteed specifications (e.g., offset voltage, gain-bandwidth) and temperature grade - not pin assignment or connectivity.

What is the typical input bias current of MAX409AEPA?

The typical input bias current of MAX409AEPA is 1pA at +25°C, with a maximum of 10pA over the full –40°C to +85°C range. This ultra-low value is achieved using p-channel JFET input stages and enables accurate amplification of signals from high-impedance sources such as pH electrodes, photodiodes, and piezoelectric sensors without significant loading error.

Can MAX409AEPA drive a 10kΩ load while maintaining rail-to-rail output?

Yes, MAX409AEPA can drive a 10kΩ load while delivering rail-to-rail output swing (within 20mV of V_CC and GND) under all specified conditions. Its output stage is designed to source/sink ≥5mA, ensuring full swing into loads ≥10kΩ at room temperature. Performance remains valid across the –40°C to +85°C range, though output voltage compliance degrades slightly at temperature extremes.