Analog Devices Inc./Maxim Integrated MAX6129AEUK41+T

Overview

The MAX6129AEUK41+T from Maxim Integrated is a micropower, low-dropout series voltage reference delivering a precise 4.096V output with ±0.4% initial accuracy and 40ppm/°C max temperature coefficient in a 5-pin SOT23 package. It sources up to 4mA, sinks up to 1mA, operates from 4.3V to 12.6V supply, consumes only 8.75µA (max), and maintains stability with capacitive loads up to 10µF-ideal for high-resolution ADCs in battery-powered instrumentation.

For engineers reviewing the MAX6129AEUK41+T datasheet, MAX6129AEUK41+T pinout, MAX6129AEUK41+T application, or MAX6129AEUK41+T equivalent, key selection criteria include ultra-low quiescent current, tight initial tolerance, low thermal drift, dropout voltage under load, and compatibility with high-precision data conversion systems requiring stable 4.096V references.

Technical Context

This series-mode bandgap voltage reference uses internal compensation to eliminate external capacitors while ensuring stability across 0–10µF load capacitance. Its architecture supports sourcing and sinking capability, enabling bidirectional load regulation critical for precision sensor signal chains and DAC buffer stages.

Designed for operation over –40°C to +85°C, the device achieves 150ppm long-term stability and 140ppm thermal hysteresis. The 200mV max dropout at 4mA load enables use in low-voltage, wide-input-range systems where headroom is constrained.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (JEDEC MO-178AA), footprint area 2.9mm² - occupies 70% less board space than SO-8 alternatives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3440BRJZ-R7 and REF3040AIDBZR, the MAX6129AEUK41+T delivers the lowest quiescent current (8.75µA) for extended battery life, while maintaining sufficient accuracy (±0.4%) and drift (40ppm/°C) for 12-bit systems - making it optimal for space-constrained, long-duration portable instrumentation.

Availability

MAX6129AEUK41+T is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor transmitters, medical patient monitors, and test & measurement equipment requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6129AEUK41+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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX6129 series targets ultra-low-power, high-accuracy voltage reference needs in battery-operated and space-constrained systems - emphasizing micropower operation, tight initial tolerance, and robust thermal performance without external components.

FAQ

What is the output voltage tolerance of the MAX6129AEUK41+T at room temperature?

The MAX6129AEUK41+T has an initial output voltage tolerance of ±0.4% at +25°C, corresponding to a 4.096V nominal output ranging from 4.0796V to 4.1124V. This Grade A specification is production-tested and guaranteed across the –40°C to +85°C operating range, making MAX6129AEUK41+T suitable for applications requiring minimal calibration in 12-bit data acquisition systems.

Does the MAX6129AEUK41+T require external capacitors for stability?

No, the MAX6129AEUK41+T does not require external capacitors for stability due to its internally compensated architecture. It remains stable driving capacitive loads from 0 to 10µF when sourcing current and 0 to 0.4µF when sinking current. An optional 0.1µF ceramic capacitor on the IN pin improves line-transient response, but MAX6129AEUK41+T functions reliably without any external capacitors - reducing BOM count and PCB area.

What is the maximum load current the MAX6129AEUK41+T can source and sink?

The MAX6129AEUK41+T can source up to 4mA and sink up to 1mA of load current while maintaining specified accuracy and regulation. Load regulation is characterized at ±0.6µV/µA for sourcing and ±8.5µV/µA for sinking, ensuring minimal output voltage shift under dynamic load conditions. These capabilities allow MAX6129AEUK41+T to directly drive ADC reference inputs, op-amp bias networks, and small-signal transducers without external buffers.

How does the supply voltage range affect the performance of the MAX6129AEUK41+T?

The MAX6129AEUK41+T operates from a 4.3V to 12.6V supply voltage range. Within this range, supply current varies by only 1.5µA/V max, ensuring stable 8.75µA operation regardless of input voltage. Line regulation is specified at 310µV/V max, meaning output voltage changes less than 1.27mV over the full supply range - critical for systems powered by unregulated sources such as battery packs or switching regulators with ripple.

Is the MAX6129AEUK41+T pin-compatible with other voltage references in SOT23-5 packages?

The MAX6129AEUK41+T uses a nonstandard pinout: Pin 1 = IN, Pin 2 = GND, Pins 3–4 = N.C., Pin 5 = OUT. This differs from common SOT23-5 references like the REF30xx or ADR34xx families, which typically assign GND to Pin 2 and OUT to Pin 5 but route IN to Pin 3 or Pin 4. Therefore, MAX6129AEUK41+T is not pin-compatible with those parts - PCB layout must accommodate its unique pin configuration to avoid functional failure.