Analog Devices Inc./Maxim Integrated MAX4094AUD+T

Overview

MAX4094AUD+T from Maxim Integrated is a quad micropower rail-to-rail input/output operational amplifier optimized for low-voltage, single-supply operation (2.7V to 6V), delivering 30µV input offset voltage, 500kHz gain-bandwidth product, and 165µA max quiescent current per amplifier - enabling high-precision signal conditioning in battery-powered data acquisition systems.

For engineers reviewing the MAX4094AUD+T datasheet, MAX4094AUD+T pinout, MAX4094AUD+T application, or MAX4094AUD+T equivalent, this page provides verified package mapping (14-pin TSSOP), confirmed rail-to-rail I/O behavior, validated 2000pF capacitive-load stability, and real-world design implications of its ±3.5mV input offset over temperature.

Technical Context

The MAX4094AUD+T employs a dual complementary input stage (NPN/PNP) to achieve beyond-the-rails™ input common-mode range (VEE − 0.05V to VCC + 0.05V) without phase reversal, while maintaining 90dB CMRR and 100dB PSRR. Its folded-cascode output stage enables rail-to-rail swing within 15mV of supplies under 100kΩ load.

Each of the four independent amplifiers features unity-gain stability with ≥2000pF capacitive loads, 12nV/√Hz input voltage noise at 10kHz, and operates across −40°C to +125°C - supporting robust performance in industrial sensor front-ends and portable instrumentation where supply headroom and thermal drift are critical constraints.

Key Specifications

Pinout & Package

MAX4094AUD+T is housed in a 14-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm pitch, 5.0mm × 4.4mm body, and exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard counterclockwise orientation from the top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2464IDR and AD8604ARUZ, the MAX4094AUD+T uniquely balances ultra-low power (165µA), guaranteed rail-to-rail operation across −40°C to +125°C, and 2000pF capacitive-load stability - making it the optimal choice for battery-powered industrial DAQ where thermal robustness and layout simplicity are prioritized over raw bandwidth.

Availability

MAX4094AUD+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and data acquisition systems requiring stable component supply, extended temperature support, and long-term lifecycle continuity.

Supply support for MAX4094AUD+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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The MAX409x family was engineered specifically for micropower, rail-to-rail signal conditioning in battery-constrained and wide-temperature environments - targeting portable instrumentation, sensor interfaces, and industrial control front-ends.

FAQ

What is the maximum capacitive load the MAX4094AUD+T can drive without external compensation?

The MAX4094AUD+T is unity-gain stable with capacitive loads up to and exceeding 2000pF, as confirmed in the Electrical Characteristics table and Figure 4 of the datasheet. This capability eliminates the need for output isolation resistors in typical DAC buffer or ADC driver configurations, simplifying PCB layout and preserving low-frequency accuracy. The MAX4094AUD+T achieves this through internal compensation optimized for low-quiescent-current operation.

Does the MAX4094AUD+T support true rail-to-rail input operation beyond the supply rails?

Yes - the MAX4094AUD+T features Beyond-the-Rails™ inputs, allowing common-mode voltages from VEE − 0.05V to VCC + 0.05V. This extends usability in applications where input signals may transiently exceed supply rails, such as sensor fault detection or power-supply monitoring. The device guarantees no phase reversal or latchup under these conditions, a key differentiator from standard rail-to-rail op amps. This behavior is explicitly documented in the Applications Information section of the MAX4094AUD+T datasheet.

What is the guaranteed input offset voltage specification for MAX4094AUD+T over its full operating temperature range?

The MAX4094AUD+T guarantees an input offset voltage of ±3.5mV over the full −40°C to +125°C temperature range, as specified in the "ELECTRICAL CHARACTERISTICS (TA = TMIN to TMAX)" table. This is distinct from the ±30µV typical value at +25°C. The ±3.5mV limit ensures predictable performance in industrial and automotive environments where thermal drift directly impacts measurement accuracy - critical for 12-bit system-level precision.

Can the MAX4094AUD+T operate from split supplies, and what are the limits?

Yes - the MAX4094AUD+T supports dual-supply operation from ±1.35V to ±3V, as stated in the General Description. This corresponds to a total supply voltage range of 2.7V to 6V, identical to its single-supply rating. When using split supplies, VEE is connected to the negative rail (e.g., −1.5V) and VCC to the positive rail (e.g., +1.5V). The input common-mode and output swing specifications remain referenced to the local supply rails, preserving rail-to-rail functionality in bipolar signal chain stages.

What package type and pin count does the MAX4094AUD+T use, and is it RoHS-compliant?

The MAX4094AUD+T uses a 14-pin Thin Shrink Small Outline Package (TSSOP) with 0.65mm lead pitch and conforms to RoHS Directive 2011/65/EU. This package is explicitly listed in the Ordering Information table and Package Information section. The "+T" suffix denotes tape-and-reel packaging for automated assembly, and the device meets JEDEC standards for moisture sensitivity level (MSL) 1 - eliminating bake requirements prior to reflow soldering.