Analog Devices Inc./Maxim Integrated MAX6126BASA25+

Overview

MAX6126BASA25+ from Maxim Integrated is a B-grade, 2.500V ultra-precision series voltage reference with ±0.06% initial accuracy, 5ppm/°C max temperature coefficient (−40°C to +125°C), and ultra-low 1.45µV_P-P (0.1Hz–10Hz) noise - designed for high-resolution ADC/DAC biasing in industrial process control and ATE systems.

For engineers reviewing the MAX6126BASA25+ datasheet, MAX6126BASA25+ pinout, MAX6126BASA25+ application, or MAX6126BASA25+ equivalent, key selection factors include its force/sense output architecture, 200mV dropout at 5mA, 380µA quiescent current, stability with 0.1–10µF load capacitance, and automotive-grade −40°C to +125°C operation.

Technical Context

The MAX6126BASA25+ implements a curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve 5ppm/°C tempco over full automotive range. Its dual-output (OUTF/OUTS) Kelvin configuration enables remote sensing to cancel PCB trace IR drop, critical for sub-0.01% system accuracy.

It features an integrated noise-reduction (NR) pin supporting 0.1µF capacitor to reduce wideband noise from 75nV/√Hz to 45nV/√Hz at 1kHz. Supply current remains stable (380–725µA) across 3.0–12.6V input and full temperature range, with load regulation ≤25µV/mA sourcing/sinking up to ±10mA.

Key Specifications

Pinout & Package

MAX6126BASA25+ is housed in an 8-pin SO package (SOIC-8, 150mil width). Pin 1 is NR (Noise Reduction), Pin 2 is IN, Pin 3 is GND, Pin 4 is GNDS, Pins 5 and 8 are internally connected (NC), Pin 6 is OUTS, and Pin 7 is OUTF.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4525BRZ and REF5025IDR, MAX6126BASA25+ uniquely combines force/sense outputs for remote sensing, integrated NR pin for configurable noise reduction, and guaranteed 5ppm/°C tempco over −40°C to +125°C - making it optimal for high-accuracy industrial transmitters and ATE where layout-induced errors must be actively canceled.

Availability

MAX6126BASA25+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, automated test equipment, and precision industrial current-loop transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6126BASA25+ 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 delivers ultra-high-precision, ultra-low-noise series voltage references optimized for metrology-grade instrumentation, high-bit-depth data converters, and systems requiring sub-0.01% accuracy over temperature and time.

FAQ

What is the maximum dropout voltage specification for MAX6126BASA25+ at 5mA load?

The MAX6126BASA25+ has a maximum dropout voltage of 0.2V at 5mA load current, defined as the minimum (VIN – VOUT) differential required to maintain output regulation within 0.1% of nominal 2.500V. This allows reliable operation from a 2.7V supply rail with 200mV headroom, supporting low-voltage industrial and battery-powered systems where supply margins are constrained.

How does the force/sense architecture of MAX6126BASA25+ improve system accuracy?

The MAX6126BASA25+ uses separate OUTF (force) and OUTS (sense) outputs to implement a Kelvin connection: OUTF delivers current to the load while OUTS senses voltage at the load node. By routing OUTS directly to the load's reference point and shorting it to OUTF there, the device cancels voltage drop across PCB traces and interconnects - enabling sub-0.01% accuracy even with 50mΩ of series resistance, which is critical in precision current sources and high-resolution ADC references.

Can MAX6126BASA25+ operate with a 0.1µF output capacitor, and what is the minimum recommended value?

Yes, MAX6126BASA25+ is stable with a minimum 0.1µF output capacitor on OUTF, as confirmed in its Electrical Characteristics table and Typical Operating Characteristics. The device supports capacitive loads from 0.1µF to 10µF without oscillation, allowing use of small ceramic capacitors for space-constrained layouts. Larger values (e.g., 10µF) further reduce transient response overshoot when driving rapidly switching loads.

What is the purpose of the NR pin on MAX6126BASA25+, and how does it affect noise performance?

The NR (Noise Reduction) pin on MAX6126BASA25+ accepts an external 0.1µF capacitor to reduce wideband noise from 75nV/√Hz to 45nV/√Hz at 1kHz. It also lowers 0.1Hz–10Hz flicker noise from 1.45µV_P-P to 0.9µV_P-P when used. Leaving NR unconnected retains baseline noise performance; adding the capacitor trades slightly longer turn-on settling time (20ms vs. 1ms) for improved signal integrity in noise-sensitive measurement paths.

Is MAX6126BASA25+ qualified for automotive applications, and what temperature range does it support?

Yes, MAX6126BASA25+ is specified for the automotive temperature range of −40°C to +125°C, with all key parameters - including ±0.06% initial accuracy, 5ppm/°C max tempco, and 380–725µA supply current - guaranteed across this range. It meets AEC-Q100 stress testing requirements for reliability in engine control units, battery management systems, and ADAS sensor interfaces where thermal stability is mission-critical.