Analog Devices Inc./Maxim Integrated MAX6126AASA50+T

Overview

MAX6126AASA50+T from Maxim Integrated is an ultra-high-precision, ultra-low-noise series voltage reference delivering 5.000V output with ±0.02% (max) initial accuracy, 3ppm/°C (max) temperature coefficient over –40°C to +125°C, and 2.85µV_P-P (0.1Hz–10Hz) flicker noise. It operates from 5.2V to 12.6V supply, supports ±10mA load current, and enables remote sensing via force/sense outputs - ideal for 24-bit SAR ADC biasing in industrial data acquisition systems.

For engineers reviewing the MAX6126AASA50+T datasheet, MAX6126AASA50+T pinout, MAX6126AASA50+T application, or MAX6126AASA50+T equivalent, key selection criteria include its 5.000V output stability under wide input voltage variation, low 200mV (max) dropout at 10mA, 0.025Ω (max) load regulation, and Kelvin-sensing capability for precision current source design.

Technical Context

The MAX6126AASA50+T employs curvature-correction circuitry and laser-trimmed thin-film resistors to achieve 3ppm/°C max tempco across –40°C to +125°C. Its proprietary low-noise architecture delivers 145nV/√Hz wideband noise (1kHz, no NR cap) and reduces to 95nV/√Hz with 0.1µF on NR pin.

It implements true series-mode operation with independent force (OUTF) and sense (OUTS) outputs plus ground-sense (GNDS), enabling Kelvin connections that cancel PCB trace IR drops. Dropout is defined at 0.1% V_OUT deviation and remains ≤0.4V up to 10mA sink/source.

Key Specifications

Pinout & Package

MAX6126AASA50+T is housed in an 8-pin SO package (SOIC-8), RoHS-compliant, with exposed pad not electrically connected. Pin 1 is NR (Noise Reduction), Pin 2 is IN, Pin 3 is GND, Pin 4 is GNDS, Pins 5 & 8 are internally connected (NC), Pin 6 is OUTS, Pin 7 is OUTF.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with ADR4550BRZ and REF5050AIDR, the MAX6126AASA50+T uniquely combines 5.000V precision, force/sense architecture, ultra-low 2.85µV_P-P noise, and 380µA quiescent current - making it optimal for portable, high-accuracy current sources and metrology-grade DVMs where trace resistance and power budget are critical.

Availability

MAX6126AASA50+T is available at Aetrix Electronics and suitable for high-resolution A/D converters, automated test equipment, and precision current sources requiring stable component supply with guaranteed automotive-grade (-40°C to +125°C) performance and long-term calibration integrity.

Supply support for MAX6126AASA50+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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.

The MAX6126 series targets ultra-precision voltage reference needs in metrology, industrial automation, and test instrumentation - emphasizing low noise, low tempco, and Kelvin-sensing capability for uncompromised DC accuracy.

FAQ

What is the maximum load current supported by the MAX6126AASA50+T?

The MAX6126AASA50+T supports ±10mA load current - sourcing up to +10mA from OUTF and sinking up to –10mA into OUTF. Load regulation is specified at ≤50µV/mA sourcing and ≤50µV/mA sinking, ensuring <±500µV output deviation across full load range. This capability enables direct drive of op-amp inputs, ADC references, and moderate-current precision current sources without external buffers.

Does the MAX6126AASA50+T require an external capacitor on the NR pin?

No, the NR pin of the MAX6126AASA50+T is optional: connecting a 0.1µF capacitor reduces 1kHz wideband noise from 145nV/√Hz to 95nV/√Hz and lowers 0.1Hz–10Hz flicker noise to 0.9µV_P-P. Leaving NR unconnected maintains baseline performance. The device remains stable and functional without it, making the capacitor a design choice based on noise requirements - not a mandatory component.

How does the force/sense architecture of the MAX6126AASA50+T improve accuracy?

The MAX6126AASA50+T improves accuracy via separate OUTF (force), OUTS (sense), and GNDS (ground sense) terminals. By routing OUTF to the load while feeding OUTS and GNDS directly to the load's reference point, the device cancels voltage drops across PCB traces and connectors. This Kelvin connection ensures the regulation loop senses the *actual* load voltage, maintaining ±0.02% output accuracy even with 100mΩ of series resistance - critical for precision current sources and remote-sensing applications.

What is the minimum input voltage required for the MAX6126AASA50+T to regulate at 5.000V?

The MAX6126AASA50+T requires a minimum input voltage of 5.2V to maintain regulation at 5.000V output. Its dropout voltage is specified as ≤0.2V at 5mA and ≤0.4V at 10mA load, meaning VIN must exceed VOUT by at least the dropout margin. At light loads (<1mA), regulation is maintained down to ~5.05V, but full 10mA capability requires ≥5.4V input to guarantee ≤0.4V dropout across temperature and process variation.

Is the MAX6126AASA50+T qualified for automotive applications?

Yes, the MAX6126AASA50+T is qualified for automotive applications with an operating temperature range of –40°C to +125°C and AEC-Q200 stress testing compliance per Maxim's datasheet. Its 3ppm/°C max tempco, 20ppm/1000hr long-term stability, and robust ESD tolerance (±2kV HBM) meet requirements for engine control units, battery management systems, and ADAS sensor signal conditioning where reference stability directly impacts safety-critical measurements.