Analog Devices Inc./Maxim Integrated MAX4482AKA

Overview

MAX4482AKA from Maxim Integrated is a dual, rail-to-rail output operational amplifier optimized for single-supply operation from +2.5V to +5.5V, drawing only 50µA per amplifier, delivering 3.0mA output drive, and specified across the -40°C to +125°C automotive temperature range in an 8-pin SOT23 package. It enables precision signal conditioning in space-constrained, low-power sensor interfaces and portable instrumentation.

For engineers reviewing the MAX4482AKA datasheet, MAX4482AKA pinout, MAX4482AKA application, or MAX4482AKA equivalent, key selection criteria include its 50µA quiescent current, rail-to-rail output swing within 80mV of rails (RL = 5kΩ), unity-gain stability with up to 400pF capacitive load, 105dB large-signal voltage gain, and guaranteed operation at +125°C.

Technical Context

The MAX4482AKA implements a CMOS input stage with rail-to-rail output stage capable of sourcing/sinking 3.0mA while maintaining output swing within 80mV of VSS and VDD under 5kΩ load. Its internal architecture ensures unity-gain stability without external compensation for capacitive loads ≤400pF.

It operates over full automotive temperature range (-40°C to +125°C) with input common-mode voltage range extending from VSS to VDD − 1.3V and features 100MΩ input resistance, 100nV/√Hz input voltage noise density at 10kHz, and 77dB PSRR at +125°C.

Key Specifications

Pinout & Package

The MAX4482AKA is housed in an 8-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and exposed pad not present. Pin 1 is marked by a dot or beveled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2462IDR and LMV358IDGKR, the MAX4482AKA uniquely balances ultra-low power (50µA), guaranteed +125°C operation, and 400pF capacitive-load stability - making it the only option among the three qualified for harsh-environment, battery-constrained dual-channel sensing.

Availability

MAX4482AKA is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical monitors, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4482AKA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX4480–MAX4483 family was designed specifically for ultra-low-power, rail-to-rail signal conditioning in space- and energy-constrained automotive and portable systems - emphasizing quiescent current efficiency, temperature robustness, and capacitive-load resilience.

FAQ

What is the maximum capacitive load the MAX4482AKA can drive while remaining unity-gain stable?

The MAX4482AKA is unity-gain stable with capacitive loads up to 400pF, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure MAX4480 toc19). This specification applies across the full -40°C to +125°C temperature range and eliminates the need for series isolation resistors when interfacing directly to ADC inputs or long PCB traces. Exceeding 400pF may cause peaking or oscillation in the MAX4482AKA output response.

Does the MAX4482AKA include a shutdown feature like the MAX4481?

No, the MAX4482AKA does not include a shutdown feature. Only the MAX4481 variant (single amplifier, 6-pin SC70/SOT23) incorporates a SHDN pin enabling shutdown mode with ≤1µA supply current. The MAX4482AKA is a dual amplifier in 8-pin SOT23 and has no dedicated shutdown terminal - all pins are assigned to amplifier inputs, outputs, and supplies as shown in the Pin Description table on page 7 of the datasheet.

What is the input common-mode voltage range for the MAX4482AKA at VDD = 3.3V?

At VDD = 3.3V, the input common-mode voltage range for the MAX4482AKA is specified as VSS to VDD − 1.3V, i.e., 0V to 2.0V. This is derived from the "Input Common-Mode Voltage Range" parameter (VCM) in the Electrical Characteristics table (page 3), which states VSS ≤ VCM ≤ VDD − 1.3V across -40°C to +125°C. This range supports direct connection to most 3.3V-output sensors and references without level shifting.

Can the MAX4482AKA operate from a 2.5V supply while maintaining rail-to-rail output swing?

Yes, the MAX4482AKA is fully specified to operate from +2.5V to +5.5V and maintains rail-to-rail output swing down to 2.5V. The datasheet confirms output voltage swing of VSS + 0.02V to VDD − 0.03V (RL = 5kΩ) at VDD = 2.5V and TA = +25°C, and Figure MAX4480 toc09/toc10 shows output swing remains within 100mV of rails across the full temperature range at minimum supply. This enables reliable use in single-cell Li-ion and low-voltage industrial systems.

What is the typical input bias current of the MAX4482AKA, and how does it affect high-impedance sensor interfaces?

The typical input bias current of the MAX4482AKA is ±0.1pA, with a maximum of ±100pA across temperature (Electrical Characteristics, page 3). At ±100pA max, it introduces <10mV error when interfacing with 100kΩ source impedance - making it suitable for high-impedance pH electrodes, piezoelectric sensors, and photodiode transimpedance stages where leakage must be minimized. This performance is enabled by its CMOS input structure.