Analog Devices Inc./Maxim Integrated MAX6126B30+

Overview

MAX6126B30+ from Maxim Integrated is a precision series voltage reference delivering 3.000V output with ±0.06% initial accuracy, 3ppm/°C max temperature coefficient (−40°C to +125°C), and ultra-low 1.75μV_P-P (0.1Hz–10Hz) flicker noise. It operates from 3.2V to 12.6V supply, supports ±10mA load current, and enables high-accuracy ADC/DAC biasing in industrial process control systems.

For engineers reviewing the MAX6126B30+ datasheet, MAX6126B30+ pinout, MAX6126B30+ application, or MAX6126B30+ equivalent, key selection criteria include its force/sense output architecture for remote sensing, 0.2V max dropout at 5mA, 380μA quiescent current, and stability with 0.1μF–10μF capacitive loads-critical for metrology-grade instrumentation design.

Technical Context

The MAX6126B30+ employs curvature-correction circuitry and laser-trimmed thin-film resistors to achieve 3ppm/°C max tempco over −40°C to +125°C. Its proprietary low-noise architecture separates reference core from output buffer, enabling 1.75μV_P-P flicker noise and 90nV/√Hz wideband noise (1kHz, no NR cap).

It features independent force (OUTF) and sense (OUTS) outputs with dedicated ground-sense (GNDS) terminal, supporting Kelvin connections to cancel PCB trace IR drops. The NR pin accepts a 0.1μF capacitor to reduce wideband noise to 55nV/√Hz and 0.1Hz–10Hz noise to 0.9μV_P-P.

Key Specifications

Pinout & Package

The MAX6126B30+ is housed in an 8-pin SO package (SOIC-8), measuring 4.9mm × 6.0mm × 1.75mm, with industry-standard footprint and lead spacing (1.27mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR4530BRZ and REF5030IDR, the MAX6126B30+ uniquely combines ultra-low quiescent current (380μA), force/sense architecture for remote sensing, and automotive-grade temperature operation-making it optimal for portable test equipment and high-precision current sources where power and layout-induced errors must be minimized.

Availability

MAX6126B30+ is available at Aetrix Electronics and suitable for high-resolution data acquisition, portable instrumentation, and industrial process control systems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6126B30+ 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 performance applications in industrial, automotive, and communications markets.

The MAX6126 series was engineered specifically for ultra-high-precision, ultra-low-noise voltage referencing in metrology-grade instrumentation, high-resolution converters, and precision current sources where thermal drift and flicker noise directly limit system resolution.

FAQ

What is the maximum dropout voltage specification for MAX6126B30+ at 10mA load current?

The MAX6126B30+ has a maximum dropout voltage of 0.4V at 10mA load current, defined as the minimum (VIN − VOUT) differential required to maintain output voltage within 0.1% of nominal 3.000V. This allows reliable operation from a 3.4V supply in low-voltage systems while preserving full accuracy and noise performance.

How does the force/sense architecture of MAX6126B30+ improve accuracy in precision current-source applications?

The MAX6126B30+ uses separate OUTF (force) and OUTS (sense) outputs with GNDS to implement a true Kelvin connection. In a precision current source, OUTF delivers current to the load while OUTS and GNDS sense voltage directly at the load terminals-canceling voltage drops across PCB traces and connectors. This eliminates up to 50mΩ of parasitic resistance error, ensuring the current is set solely by the sense resistor value.

Can MAX6126B30+ operate with a 0.1μF output capacitor, and what is the minimum stable capacitance?

Yes, the MAX6126B30+ is stable with a minimum 0.1μF output capacitor connected from OUTF to GND. The device is characterized and guaranteed stable across the full 0.1μF to 10μF range, enabling flexible trade-offs between transient response (smaller caps) and ripple suppression (larger caps). No external series resistance is required.

What noise reduction benefit does adding a 0.1μF capacitor to the NR pin provide for MAX6126B30+?

Adding a 0.1μF capacitor to the NR pin of MAX6126B30+ reduces 1kHz wideband noise from 90nV/√Hz to 55nV/√Hz and 0.1Hz–10Hz flicker noise from 1.75μV_P-P to 0.9μV_P-P. This improvement is critical for applications like high-resolution sigma-delta ADCs where low-frequency noise dominates effective resolution.

Is MAX6126B30+ specified for operation across the full −40°C to +125°C automotive temperature range?

Yes, MAX6126B30+ is fully specified and tested over the −40°C to +125°C temperature range. Its 3ppm/°C maximum temperature coefficient, 20ppm/1000hr long-term stability, and guaranteed 380μA supply current across this range confirm qualification for under-hood automotive electronics and harsh industrial environments.