Analog Devices Inc./Maxim Integrated MAX6034BEXR21

Overview

MAX6034BEXR21 from Maxim Integrated is a precision, micropower, low-dropout series voltage reference delivering 2.048V output with ±0.4% initial accuracy, 75ppm/°C max temperature coefficient, and 200mV max dropout at 1mA load - optimized for high-accuracy data acquisition and battery-powered instrumentation.

For engineers reviewing the MAX6034BEXR21 datasheet, MAX6034BEXR21 pinout, MAX6034BEXR21 application, or MAX6034BEXR21 equivalent, this page delivers verified specifications, SC70-3 package details, real-world load/line regulation behavior, stability with 0–1µF capacitive loads, and validated alternatives for precision analog signal chains.

Technical Context

The MAX6034BEXR21 employs a proprietary curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve tight initial accuracy and low thermal drift. Its series-mode architecture eliminates external biasing resistors and supports sourcing up to 1mA and sinking up to 200µA.

Internally compensated for stability across 0–1µF load capacitance, it operates from 2.5V to 5.5V input while maintaining supply current variation ≤16µA/V - enabling robust performance in space-constrained, low-power systems where reference stability directly impacts ADC/DAC accuracy.

Key Specifications

Pinout & Package

MAX6034BEXR21 is housed in a miniature 3-pin SC70 surface-mount package (2.0mm × 2.1mm × 0.9mm), optimized for PCB area-constrained designs including portable medical sensors and IoT edge nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6034BEXR21, MAX6033BEXR21-T trades tighter TC and lower dropout for cost reduction, while ADR3420BRJZ-R7 offers superior accuracy and drift at the expense of higher quiescent current and mandatory external capacitance - making MAX6034BEXR21 optimal for space- and power-sensitive precision analog systems.

Availability

MAX6034BEXR21 is available at Aetrix Electronics and suitable for hand-held equipment, battery-operated instrumentation, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6034BEXR21 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 - with emphasis on reliability and integration for demanding industrial and medical systems.

The MAX6034 family was engineered specifically for micropower, low-dropout voltage reference needs in battery-constrained and space-limited data acquisition systems - prioritizing accuracy, thermal stability, and minimal external components.

FAQ

What is the maximum load current the MAX6034BEXR21 can source or sink?

The MAX6034BEXR21 can source up to 1mA and sink up to 200µA while maintaining specified accuracy and dropout voltage. At 1mA sourcing, dropout remains ≤200mV; sinking capability is limited to 200µA to avoid exceeding the 0.2% output deviation limit. Exceeding these values may cause output regulation loss or increased temperature coefficient error in the MAX6034BEXR21.

Does the MAX6034BEXR21 require an external output capacitor for stability?

No, the MAX6034BEXR21 is internally compensated and stable with output capacitance ranging from 0 to 1µF - including no capacitor. An external capacitor is optional and only recommended to improve transient response during large load steps. This eliminates BOM cost and PCB area typically needed for reference stability, a key advantage of the MAX6034BEXR21 in miniaturized designs.

What is the input voltage range for the MAX6034BEXR21, and how does it relate to the 2.048V output?

The MAX6034BEXR21 operates from 2.5V to 5.5V input. Unlike shunt references, it is a series-mode device - so minimum input is defined by dropout: VIN ≥ VOUT + 200mV = 2.248V. The 2.5V lower limit ensures margin for line regulation and temperature variation. This wide input range allows direct use with common 3.3V or 5V rails, or battery sources down to ~2.4V, making the MAX6034BEXR21 highly flexible in mixed-rail systems.

How does the temperature coefficient of the MAX6034BEXR21 compare to the 'A' grade version?

The MAX6034BEXR21 has a maximum temperature coefficient of 75ppm/°C, versus 30ppm/°C for the MAX6034AEXR21. This means over the full -40°C to +85°C range, the MAX6034BEXR21's output may drift up to ±0.015V, while the 'A' grade drifts ≤±0.006V. Both share identical 2.048V nominal output and ±0.4% vs. ±0.2% initial accuracy - so the 'B' grade offers cost-effective performance where moderate thermal drift is acceptable.

Can the MAX6034BEXR21 be used in place of the MAX6034AEXR21 without circuit changes?

Yes - the MAX6034BEXR21 is pin-compatible and functionally identical to the MAX6034AEXR21 except for relaxed initial accuracy (±0.4% vs. ±0.2%) and temperature coefficient (75ppm/°C vs. 30ppm/°C). No PCB or schematic changes are needed; substitution is valid where the looser tolerances meet system-level accuracy requirements - such as consumer-grade data loggers or non-critical sensor interfaces using the MAX6034BEXR21.