Analog Devices Inc./Maxim Integrated MAX6126B41+

Overview

MAX6126B41+ from Maxim Integrated is a high-precision, ultra-low-noise series voltage reference delivering 4.096V output with ±0.06% initial accuracy, 3ppm/°C max temperature coefficient (–40°C to +125°C), and 2.4µV_P-P (0.1Hz–10Hz) flicker noise. It operates from 4.3V to 12.6V supply, supports ±10mA load current, and enables remote sensing via separate force (OUTF) and sense (OUTS) outputs - ideal for high-resolution 12-bit/16-bit SAR ADC biasing in industrial data acquisition systems.

For engineers reviewing the MAX6126B41+ datasheet, MAX6126B41+ pinout, MAX6126B41+ application, or MAX6126B41+ equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in precision metrology and ATE, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The MAX6126B41+ employs curvature-corrected bandgap architecture with laser-trimmed thin-film resistors to achieve 3ppm/°C tempco and ±0.06% initial accuracy over –40°C to +125°C. Its dual-output topology (OUTF/OUTS/GNDS) implements Kelvin sensing to eliminate line-drop errors in precision current sources and reference-driven DACs.

It features integrated noise-reduction capability via the NR pin: adding a 0.1µF capacitor reduces wideband noise from 120nV/√Hz to 80nV/√Hz at 1kHz and suppresses 0.1Hz–10Hz flicker noise to 0.9µV_P-P. Supply current remains stable at 380µA (typ) across 4.3V–12.6V input, with dropout as low as 50mV at 5mA load.

Key Specifications

Pinout & Package

MAX6126B41+ is packaged in an 8-pin µMAX® package (2.1mm × 2.1mm, 0.8mm height), optimized for space-constrained industrial and automotive PCBs. The µMAX footprint is pin-compatible with SO-8 but offers 60% smaller area and improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4540BRZ and REF5040AIDR, MAX6126B41+ uniquely integrates force/sense outputs and NR-capacitor noise reduction in a µMAX package - delivering superior system-level accuracy in space-constrained, low-noise, and remote-sensing applications without added components or layout complexity.

Availability

MAX6126B41+ is available at Aetrix Electronics and suitable for high-resolution A/D converters, automated test equipment, and precision current sources requiring stable component supply across automotive and industrial temperature ranges.

Supply support for MAX6126B41+ 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6126 family targets ultra-high-accuracy, ultra-low-noise voltage references for metrology-grade instrumentation, where long-term stability, thermal hysteresis control, and Kelvin-sensing capability are mandatory.

FAQ

What is the maximum load current supported by MAX6126B41+?

MAX6126B41+ supports ±10mA load current - sourcing up to +10mA from OUTF and sinking up to –10mA into OUTF. Load regulation is specified at 2µV/mA (sourcing) and 5µV/mA (sinking), ensuring <±10µV output shift across full load range. This capability enables direct drive of op-amp inputs, DAC references, and moderate-current precision current sources without external buffers.

How does the NR pin reduce noise in MAX6126B41+?

The NR pin on MAX6126B41+ accepts an external 0.1µF capacitor to reduce wideband noise from 120nV/√Hz to 80nV/√Hz at 1kHz and suppress 0.1Hz–10Hz flicker noise from 2.4µV_P-P to 0.9µV_P-P. This internal noise-shaping network targets high-frequency supply coupling and internal transistor noise - making it essential for high-SNR ADC applications and low-drift DVM designs where noise below 10Hz dominates error budgets.

Can MAX6126B41+ be used with a 4.2V supply?

No - MAX6126B41+ requires minimum 4.3V supply voltage per datasheet Absolute Maximum Ratings and Electrical Characteristics tables. At 5mA load, its dropout voltage is 50mV (min), so 4.2V would fall below the required (4.096V + 0.05V) = 4.146V headroom. Operating below 4.3V risks output regulation loss, increased noise, and potential instability - use only within 4.3V–12.6V specified range.

What is the purpose of GNDS and how should it be connected?

GNDS is the ground-sense terminal for Kelvin (4-wire) remote sensing in MAX6126B41+. It must be connected directly to the load's ground point - not to the main GND pad - to cancel voltage drop across PCB traces between the IC and load. When paired with OUTS, this configuration eliminates errors from up to 100mΩ of series resistance, enabling <0.01% accuracy in precision current sources and reference-driven amplifiers.

Is MAX6126B41+ RoHS-compliant and lead-free?

Yes - the '+' suffix in MAX6126B41+ explicitly denotes a lead(Pb)-free and RoHS-compliant package per Maxim Integrated's ordering information. The µMAX package uses matte tin plating and meets JEDEC J-STD-020 reflow profiles, supporting standard Pb-free assembly processes without reliability degradation.