Analog Devices Inc./Maxim Integrated MAX6129BEUK41+T

Overview

MAX6129BEUK41+T from Maxim Integrated is a micropower, low-dropout series-mode bandgap voltage reference delivering 4.096V output with ±1% initial accuracy and 100ppm/°C max temperature coefficient in a 5-pin SOT23 package. It operates from 4.3V to 12.6V supply, draws only 8.75µA (max) supply current, sustains 4mA source / 1mA sink load current, and features 200mV max dropout-ideal for precision battery-powered data acquisition systems.

For engineers reviewing the MAX6129BEUK41+T datasheet, MAX6129BEUK41+T pinout, MAX6129BEUK41+T application, or MAX6129BEUK41+T equivalent, key selection criteria include its guaranteed 4.096V output tolerance, ultra-low quiescent current stability over supply voltage (≤1.5µA/V), load regulation performance (≤8.5µV/µA), and compatibility with capacitive loads up to 10µF without external compensation.

Technical Context

The MAX6129BEUK41+T implements a series-mode bandgap architecture with internal compensation, eliminating need for external stabilization capacitors. Its design targets high-accuracy analog signal chains where long-term drift (<150ppm over 1000 hours) and thermal hysteresis (<140ppm) must be tightly controlled.

It delivers stable 4.096V reference output across -40°C to +85°C, supporting precision A/D and D/A converters requiring exact 12-bit (4.096V = 1mV/LSB) or 16-bit scaling. The device maintains ≤0.1% output error during turn-on settling (1.2ms typical) and rejects supply ripple by ≥36dB at 120Hz.

Key Specifications

Pinout & Package

MAX6129BEUK41+T is housed in a 5-pin SOT23-5 surface-mount package (JEDEC MO-178AA), occupying 70% less board area than comparable SO packages. Pin 1 is IN (supply input), Pin 2 is GND, Pins 3 and 4 are internally connected no-connect terminals (may be left floating or tied to ground), and Pin 5 is OUT (4.096V reference output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6129BEUK41+T, MAX6126BEUR41+T offers superior TC and lower I_Q in a smaller package but lacks N.C. pins for grounding flexibility; REF3040AIDBZR provides tighter initial accuracy and TC at cost of 6× higher supply current and reduced load drive (25mA vs. 4mA), making it less suitable for direct ADC driving in space-constrained battery systems.

Availability

MAX6129BEUK41+T is available at Aetrix Electronics and suitable for battery-powered data loggers, portable multimeters, medical wearables, and loop-powered transmitters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6129BEUK41+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 and mixed-signal ICs for demanding industrial, medical, and communications applications.

The MAX6129 family delivers ultra-low-power, high-accuracy series voltage references optimized for battery-operated instrumentation and data conversion systems where board space, power budget, and thermal stability are critical.

FAQ

What is the output voltage tolerance and temperature coefficient of the MAX6129BEUK41+T?

The MAX6129BEUK41+T provides a nominal 4.096V output with ±1% initial accuracy (B-grade) and a maximum temperature coefficient of 100ppm/°C. This means its output voltage may drift up to ±0.41% across the full -40°C to +85°C operating range, ensuring predictable performance in unregulated thermal environments without active calibration.

Does the MAX6129BEUK41+T require external capacitors for stability?

No, the MAX6129BEUK41+T does not require external input or output capacitors for stability. Its internal compensation capacitor ensures robust operation with capacitive loads from 0 to 10µF when sourcing current, and up to 0.4µF when sinking current-eliminating BOM cost and PCB area typically needed for discrete references.

What is the minimum supply voltage required for the MAX6129BEUK41+T to maintain regulation?

The MAX6129BEUK41+T requires a minimum supply voltage of 4.3V to maintain regulation at full 4mA load, based on its 200mV maximum dropout specification. At zero load, dropout drops to 140mV, allowing operation down to 4.236V-but design margins should retain the 4.3V minimum to guarantee performance across temperature and process variation.

How does the MAX6129BEUK41+T compare to the A-grade version MAX6129AEUK41+T?

The MAX6129BEUK41+T differs from the A-grade MAX6129AEUK41+T primarily in initial accuracy (±1% vs. ±0.4%) and temperature coefficient (100ppm/°C vs. 40ppm/°C). Both share identical pinout, package, supply range, and load drive capability. The B-grade offers cost advantage where tighter accuracy is not required, such as in non-critical sensor front-ends or consumer-grade instrumentation.

Can the MAX6129BEUK41+T drive a 10µF ceramic capacitor directly at its output?

Yes, the MAX6129BEUK41+T is explicitly characterized and guaranteed stable with output capacitive loads up to 10µF when sourcing current, including standard X7R and X5R ceramics. This capability supports low-impedance filtering for sensitive ADC references and eliminates need for series isolation resistors or additional buffering stages in compact designs.